They are known as thermo softening plastics. For Ex… Ans. For Ex:Polythene is a thermoplastic having linear polymer chains with no cross-linkage,so it becomes soft on heating. b) Rayon. c)  Like synthic fibres, plastic is also a polymer. Ans. Question 8 Why are electric switches,plugs and sockets made of thermosetting plastics? Another example is the handle of a screw driver which is also made of plastic. Thermosetting: 1> This plastic can be softened repeatedly by heating and can be moulded into different shapes: 1> This plastic which once set, does not become soft on heating and cannot be moulded a second time. Thermosetting and thermoplastics are two different classes of polymers, which are differentiated based on their behavior in the presence of heat.The main difference between thermoplastic and thermosetting plastic is, thermoplastic materials have low melting points; therefore, they can be remoulded or recycled by … Rayon is different from synthetic fibres because: It has a silk like appearance. Electrical wires have plastic covering which show that plastics are poor conductors. It is a brownish solid substance and was also the first plastic ever made with synthetic components. 2)they are poor conductors of electricity. 3. Thermoplastic is lower in molecular weight, compared to thermosetting plastic. a) Thermosetting plastics. They can be moulded only once. It does not transmit heat to and from the body and protects us from heat. Thermosetting plastic. ... Bakelite, a thermosetting plastic, is used to make plugs and switches. 5. It means do not get destroyed by the chemical action. With a number of benefits to thermosetting plastics vs. thermoplastics, the methods and materials fill an important role in the plastic fabrication industry.Within the class of thermosetting polymers, there are a number of different types of material that each serve unique purposes and applications. FREE Living Science 2019 2020 for class 8 Science, Chapter 3 - Synthetic Fibres And Plastics from (Living Science 2019 2020). A-Z. Thermosetting plastics examples include phenolic resins, unsaturated polyester resins, and epoxy resins. Give examples which indicate that nylon fibres are very strong. They are used for making insulations of electric wires and cables,various types of plastic containers,combs,toys,raincoats,seat cover,bristles of brushes,chains. Initially, the polymer is a liquid or soft solid. They are used for making handles of cooking utensils,plates,cups,floor tiles,electrical fitting,ballpoint pens,telephones. Exam style Questions. Ans. Answer: Nylon, terylene, PET, acrylic, teflon, etc. Learn more about this Silicon Valley suburb, America's richest neighborhood. Click here to get an answer to your question ️ Polythene and PVC are examples of:-a. Biodegradable substancesb. 2. Another example is Melamine which has a capacity to resist fire and heat much efficiently than other plastics. Often used in boats, automobiles, aircraft and surfboards. Your email address will not be published. […] It is hazardous to the environment which is more when compared to the thermoplastic and less than the rubber. o Bakelite and melamine are examples of thermosetting plastics. Such handles do not heat up during cooking. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Question 7 Why frying pan handles are made of thermosetting plastics? Explain the difference between thermoplastic and thermosetting plastics. Answer – Some examples which show that plastics are non-corrosive in nature. Thermoplastic are made up long chain molecules called polymers.The long polymers chains are not cross-linked with one another.Due to this,on heating the individual polymer chains can slide over one another and thermoplastic material becomes soft and ultimately melts. Polyethylene; Poly Vinyl Chloride(PVC) Teflon; Thermosetting Plastics or Thermoset Plastics: By heating the polymer, if it turns hard, then it is called as Thermosetting plastic material. (a) the handles of a saucepan are made of thermosetting plastic because it is a bad conductor of heat and does not get heated up while cooking. Ans. Answer: Protein Question 3. ... A type of material that combines a plastic with glass fiber. Answer – Some examples which show that plastics are non-corrosive in nature. Such a material is also known as a thermoset or thermosetting polymer. These plastics cannot be softened again on heating. The use of epoxy resins is for coating materials, manufacturing insulating materials, etc. What are some examples of thermosetting plastics? Thermosetting plasticsc. The material difference between the two is that thermoplastics can be remelted , while thermoset plastics remain in a permanent solid state once hardened . Thermosetting plastics have primary bonds between molecular chains and held together by strong cross-links. They are used for making switches, handles of utensils, Fabrics are made from fibres obtained from natural or artificial sources. Question 10 Why the handle and bristles of toothbrush are made of different plastic? The handle and bristles of a toothbrush are made of different plastics.Because the handle of a toothbrush has to be hard and rigid(made of thermosetting plastic) whereas bristles have to be soft and flexible(made of thermoplastic), Structure of Thermoplastic and Thermosetting plastic. Example -. Question 6 Why are thermoplastics not used for making frying pan handles? Nylon fibres are very strong so they are used for making parachutes and ropes for rock-climbing. Structure: It exhibits a Cyclic structure. b) Silk. Synthetic Fibres and Plastics -Class 8 : Notes. Download free PDF of best NCERT Solutions , Class 8, Science, CBSE- Synthetic Fibres and Plastics . Question 9 Give few differences between thermosetting and thermoplastic? Thermosetting plastics have high melting points and tensile strength. 2. Thermosetting Plastics: Plastics which when moulded once cannot be softened by heating are called thermosetting plastics. The classification is based on the chemical structure. Ans. Thermosetting Plastic Advantages and Disadvantages Common examples of composite materials. Some types of thermoplastics are expensive, strong & used in place of metal, while the others are used in common everyday products, They are easy to mold & shape when they are hot, They can turn to liquid at high temperatures, When they are cooled, They turn into hard & solid plastic, The keyboards & compact disc cases are made of the thermoplastics. Give two examples of each. Plastics do not react with food items and they are strong, light and durable. Thermosetting plastic: Plastics which do not get deformed or softened on heating when mold once, are called thermosetting plastics. Epoxy; Silicone; Polyurethane; Phenolic Explain why some fibres are called synthetic. Most of the plastic that we see in our day to day life is Thermoplastic. All NCERT textbook questions have been solved by our expert teachers. The lesson covers the complete explanation of class 8 Chapter 3 Synthetic Fibres and Plastics.Topics covered are Introduction to fibres, kinds of fibres. Urea Formaldehyde … We can bend thermoplastics easily. ADVERTISEMENT. 1. Thermoplastics have low melting points and low tensile strength. Learn faster with spaced repetition. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics.It is used to make floor tiles, kitchenware and fire resistant fabrics. Class 8 Chemistry Synthetic Fibers and Plastics: THERMOSETTING PLASTICS: THERMOSETTING PLASTICS: This category of plastic once solidified during the molding process, cannot be softened back. It means do not get destroyed by the chemical action. Q10. Epoxy resins are an example of … Answer: Cotton Question 2. Answer: d Explaination: (d) Bakelite is cross linked thermosetting polymer of phenol and formaldehyde. Thermoplastic vs Thermosetting Plastic Thermoplastics and thermosetting plastics are two separate classes of polymers, which are differentiated based on their behavior in the presence of heat. Some common thermoplastics are polyethylene, PVC, polystyrene, nylon, and acetate. The handle and the bristles of the toothbrush should not be made of the same material as the handle should be hard to give a smooth grip and bristle should be soft so that it doesn’t harm the gum of the teeth. This discussion on similarities between thermoplastics and thermosetting plastics is done on EduRev Study Group by Class 8 Students. Thermosetting plastics are made up long chain molecules called polymers.The long polymer chains are cross linked with one another.These cross links prevent the displacement of individual polymer chains on being heated.Due to this,thermosetting plastic do not become soft on heating once they have been set into a particular shape. The Questions and Answers of similarities between thermoplastics and thermosetting plastics are solved by group of students and teacher of Class 8, which is also the largest student community of Class 8. Thermoplastic can be … Hello Everyone Welcome To Engineer’s AcademyIn this video we will learn, what is the Difference between the thermoplastic & Thermosetting Plastics. Explain why plastic containers are favoured for storing food. Name the basic component of animal fibres. Thermosets cure by chemical reaction which is not able to be undone so that the resin is able to be reused, the main ones are polyester resin, epoxy resin,polyurethane resin (two pack) and phenolic resin. It may break when forced to bend. Give two examples of each. Thermosetting plastics are used for making the handles of cooking utensils(fry pans and pressure cooker)because: 1)they do not become soft on getting heated, Thermosetting plastics are used for making electrical fitting(electric switches,plugs,sockets) because. Name a glue that is a thermosetting plastic and describe how it is mixed. On heating thermosetting plastics, it cannot be softened. Question 11 Why thermoplastics become soft on heating ? We hope the given CBSE Class 8 Science Notes Chapter 3 Synthetic Fibres and Plastics Pdf free download will help you. You can also get free sample papers, Notes, Important Questions. Synthetic Fibres and Plastics Class 8 Extra Questions Science Chapter 3 Synthetic Fibres and Plastics Class 8 Extra Questions Very Short Answer Questions Question 1. Bakelite: Bakelite is phenol formaldehyde resin with monomer chemical formula of (C 6-H 6-O.C-H 2-O). These are the plastics that cannot be softened by heating once they are moulded. Some common thermoplastics are polyethylene, PVC, polystyrene, nylon, and acetate.. Thermosetting plastics: Thermosetting Plastics are cross-linked polymers, which become soft only on first heating with pressure and get hard permanently on cooling due to chemical changes by condensation and polymerization, and becomes unaffected by the heat or solvents. Answer: Protein Question 3. NCERT Solutions , Class 8, Science . o A plastic which wh en set does not become soft on heating again and cannot be moulded a second time is called a thermosetting plastic. She has started this educational website with the mindset of spreading Free Education to everyone. The huge collection of Questions and Answers for academic studies, CBSE school. Answer: c) Melamine plastic. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. A thermosetting polymer which is also known as a thermoset or thermosetting plastic is a polymer consisting of cross-linked structure or heavily branched molecules. for example : Bakellite , melanin, Formaldehyde Thermoplastic Plastic are kind of plastic which can be moulded again and again by heating and easily reused.For example :PVS, Polysterine , nylon , polythine. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. Answer: Cotton Question 2. types of thermosetting plastic With a number of benefits to thermosetting plastics vs. thermoplastics , the methods and materials fill an important role in the plastic fabrication industry. Thermoplastics provide strong, durable adhesion at normal temperatures, and they can be softened for application by heating without undergoing degradation. Epoxy Resin: These are a class of polymers which contain epoxide groups. In fact, 80% of the polymers found in the market are Thermoplastics. Few examples of thermosetting plastics are: phenolic resins, epoxy resins, amino resins, melamine, Bakelite. The electric current does not pass through such plastics. Name a plastic that is used as the basis of many paints and varnishes. In America's richest town, $500k a year is below average. Class 8 Science Synthetic Fibres and Plastics Chapter 3 (7/9) Plastic - Defn., Types, Thermo, Thermosetting Explanation in Hindi, Imp Questions and Answers. Main Difference – Thermoplastic vs Thermosetting Plastic. 5. Ans. They include: Vulcanized rubber Fiberglass (a fiber-reinforced polymer composite) Polyester resin Polyurethane Melamine Bakelite Silicone resin Epoxy resin Les McLean, Ph.D. in Engineering. Thermoplastic Examples: The examples of Thermoplastics are as follows. Your email address will not be published. Thermosetting plastics: Plastics which can be easily deformed and bend easily on heating are known as thermoplastics. Thermosetting Plastics: Plastics which when moulded once cannot be softened by heating are called thermosetting plastics. Some fabrics do not occur in the nature are hence called synthetic fibres. Q10. The main physical difference is how they respond to high temperatures. The Questions and Answers of similarities between thermoplastics and thermosetting plastics are solved by group of students and teacher of Class 8, which is also the largest student community of Class 8. Ans. Melamine (Used to make microwave safe utensils) Bakelite (Used to Make Switches) Thermoset plastics are frequently used for sealed products due to their resistance to deformation and are also among some of the most impact resistant plastics available. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. These are generally used in adhesives. Due to this, saucepan handles are made of thermosetting plastic. Thermosetting plastic cannot be bent easily. •  Its fibres can also be woven like those of natural fibres. Examples of thermoset plastic polymers include epoxies, phenolics, silicones, and polyesters. Give examples to show that plastics are noncorrosive in nature. […] Free PDF Download of CBSE Science Multiple Choice Questions for Class 8 with Answers Chapter 3 Synthetic Fibres and Plastics. Plastic containers don’t react with stored food in it. Dec 07, 2020 - Thermosetting and Thermosoftening Plastics(in detail) Class 8 Video | EduRev is made by best teachers of Class 8. In addition, some materials such as polyester can occur in both thermoplastic and thermoset versions. A. Thermosetting plastics are used for making those articles which may get too hot during use and are hard and rigid. Name some artificial fibres. 3 Answers. Thermosetting Polymers Examples. Bakelite: Bakelite is phenol formaldehyde resin with monomer chemical formula of (C 6-H 6-O.C-H 2-O). It is used in kitchenware and fabrics as well as floor tiles. Answer: Thermosetting plastic is fire-resistant and can withstand very high temperature. Heat provides energy for chemical reactions that increase the cross-linking Unlike thermoplastic pellets, the components of thermoset polymers are stored in liquid form, usually in large tanks or containers. They are known as thermosets. Thermoplastics d. R… a) Nylon. Those plastics whch can be moulded only once and do not change shape on heating are called Theromosetting Plastics. Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. Plastic can be recycled, coloured, reused, rolled into sheets or made into wires. Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. Thermosetting polymers are cross-linked or heavily branched polymers which get hardened during the molding process. Question 5 What are the various types of plastics? b) Plastic bag, c) Cotton cloth. 2. It is a brownish solid substance and was also the first plastic ever made with synthetic components. Thermosetting Plastic Advantages: More resistant to high temperatures (a) Saucepan handles (b) Electric plugs/switches/plug boards. 1. Question 12 Why thermosetting plastic does not become soft on heating? Name a natural fibre. Thermosetting. Bakelite is a extremely poor conductor of heat and electrical vitality and it is used for making electrical switches. Fiber structures may be woven into a fabric or randomly arranged. These are called thermosetting plastics. This video is highly rated by Class 8 students and has been viewed 1000 times. 4. Temperature: The servicing temperature of a thermoset plastic material is 300°C. d) Rayon 9 Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. (b) Electric plugs/ switches/ plug boards are saucepan is made of thermosetting plastic because it is a bad conductor of electricity. A plastic which once set,does not become soft on heating and cannot be moulded a second time,is called thermosetting plastic. For Ex:Bakelite is a thermosetting polymer having long polymer chains connected through cross-links due to which it does not become soft on heating. NCERT Solutions  HOTS Questions  Notes  MCQ  Sample Questions  Test. Thermosetting Polymers Examples. Thermoplastic polymers are linear (slightly branched) long chain polymers, which can be repeatedly softened and hardened on heating. This is the reason it cannot be reshaped once it is moulded. Question 3 What are thermosetting plastics? These polymers which are in the soft solid or viscous state on heating undergo extensive cross-linking in moulds and become irreversibly hard as well as insoluble products. 2> Examples are : polythene and polyvinyl chloride: 2> Examples … Ans. See other topics from Chapter 3 Synthetic Fibres and Plastics, Biodegradable and Non-biodegradable material, Steps to save environment from plastic waste, English Alphabets with Phonics Pronunciation, Economics Chapter 2 Sectors of the Indian Economy – Notes & Study Material, Economics Chapter 1 Development – Notes & Study Material, Geography Chapter 6 Manufacturing Industries – Notes & Study Material. Answer: Nylon, terylene, PET, acrylic, teflon, etc. The result is a relatively inexpensive material that is stronger and more flexible than many metals by weight. Science NCERT Grade 8, Chapter 3, Synthetic Fibres and Plastics deals majorly with the fundamentals of synthetic fibres in a comprehensive way. (a) Explain the difference between thermoplastics and thermosetting plastics (two differences each). Plastic containers don’t react with stored food in it. Plastics are non-biodegradable materials and is harmful for our environment. Thermosetting plastic cannot be softened by heating. They are not flexible.Due to this,they cannot be bend.When the article made of thermosetting plastic is forced to bend,it breaks. b)  Synthetic fibres are synthesized from raw-materials called petrochemicals. Thermoplastics and thermosetting polymers are types of plastic that undergo different production processes and yield a variety of properties depending on the constituent materials and production method. We hope the given CBSE Class 8 Science Notes Chapter 3 Synthetic Fibres and Plastics Pdf free download will help you. Question 2 Give example of thermoplastics? Therefore manufacturing synthetic fibres is actually a helping conservation of forests. Question 4 Give example of thermosetting plastics? Once set in a given shape and solidified,a thermosetting plastic cannot be re-softened or re-moulded. Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. 1. Read More. Polythene. Class 8 Science Synthetic Fibres and Plastics Chapter 3 (7/9) Plastic - Defn., Types, Thermo, Thermosetting Explanation in Hindi, Imp Questions and Answers. Name some artificial fibres. a)  Synthetic fibres are also called man-made or artificial fibres. Question 13 What is the structure of polythene? Ans. They can’t be finally disposed off and hence should be avoided. Main Difference – Thermoplastic vs Thermosetting Plastic. Why is Melamine Formaldehyde used for the manufacture of electrical plugs and sockets? 1. Electric plugs/switches/plug boards Answer: Thermosetting plastic is bad conductor of electricity and heat. Class 8 - Science - Synthetic Fibres and Plastics . Fibres and Fabrics The clothes are made of fabrics. ... plastics which when mould once, cannot be softened or deformed by heating. c) Nylon. Name a natural fibre. Study Thermosetting Plastics, Glues, Elastomers and Biodegradable Polymers flashcards from Jack Lowe's class online, or in Brainscape's iPhone or Android app. What are examples of Thermoplastic and Thermosetting plastics? Hence they are favored for storing food. Thermoplastic can be bent easily. Give examples to show that plastics are noncorrosive in nature. ... Differentiate between thermoplastics and thermosetting plastics. Though it’s costlier than thermosetting due to its recycled nature and properties to mold into anything makes it an ideal choice for industries. These are the plastics that can be deformed easily on heating and can bend also. Example -. However synthetic fibres are made up of synthetic materials and not from plants or animals. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Explain why the following are made of thermosetting plastics. The lesson covers the complete explanation of class 8 Chapter 3 Synthetic Fibres and Plastics.Topics covered are Introduction to fibres, kinds of fibres. A plastic which can be softened repeatedly by heating and can be moulded into different shapes again and again is called thermoplastic. 5. Examples of thermosetting plastics include bakelite, urea-formaldehyde resins. 4. Name the basic component of animal fibres. Last Updated on September 29, 2020 By Mrs Shilpi Nagpal Leave a Comment. Thermoplastics can be moulded repeatedly. Natural fibres require raw materials from plants and animals and they resulted in deforestation and animal killing. Thermosetting plastics o A plastic which wh en set does not become soft on heating again and cannot be moulded a second time is called a thermosetting plastic. Common examples of thermoset plastics and polymers include epoxy, silicone, polyurethane and phenolic. o Bakelite and melamine are examples of thermosetting plastics. Ans. Thermoplastics. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. 1. (I)  Polyester- Fabrics don’t wrinkle easily, (II)  Teflon- Used to make non-stick cookwares, (III)  Rayon- Prepared by using wood pulp, (IV)  Nylon- Used for making parachutes and stockings. (i) Plastic is used in making toys, suitcase, bags, cabinets, brush, chairs, tables, and many other countless items. PVC. This discussion on similarities between thermoplastics and thermosetting plastics is done on EduRev Study Group by Class 8 Students. Thus, it cannot be reshaped once moulded. Other articles where Thermosetting plastic is discussed: adhesive: Synthetic adhesives: …into two general categories—thermoplastics and thermosets. Key Differences. (ii) Polythene (Poly + ethene) is one of the most famous examples of plastic, which is … Some other examples of thermoset plastic polymers include silicones, vulcanized rubber, epoxies, polyesters and phenolics. Thermoplastic. Ans: Thermosetting plastics are kind of plastic which once moulded cannot moulded again by heating. Bakelite and melamine are the examples of thermosetting plastics. It is obtained from … Synthetic Fibres and Plastics Class 8 Extra Questions Science Chapter 3 Synthetic Fibres and Plastics Class 8 Extra Questions Very Short Answer Questions Question 1. Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. Thermoplastics are made up of linear molecular chains whereas thermosetting plastics are made up of cross-linked molecular chains. The chapter Synthetic Fibres and Plastics begins with an introduction on fibres and lists few commonly known natural and artificial fibres.Apart from this, it also covers different types of synthetic fibres like - These are generally used in adhesives. Furthermore, unsaturated polyester resins are useful for the making plastics reinforced fibreglass. Plastics not get rusted like iron when left exposed to moisture and air. Based on latest exam pattern, cups, floor tiles, electrical fitting, ballpoint pens, telephones kind... By Mrs Shilpi Nagpal Leave a Comment combines a plastic that is stronger and more flexible than many by. Resin with monomer chemical formula of ( C 6-H 6-O.C-H 2-O ) polymer with! Once and do not show any chemical change such a material is or can be moulded into different again... Cbse Class 8 students and has been viewed 1000 times thermosetting and thermoplastic click here to get an answer your. Resins is for coating materials, manufacturing insulating materials, thermosets and thermoplastics free! Market are thermoplastics the use of epoxy resins is for coating materials, manufacturing insulating materials,.! Whereas thermosetting plastics and bristles of toothbrush are made of different types of plastics plastics thermosetting plastic class 8 examples 8: Notes CBSE. Website with the mindset of spreading free Education to everyone and air kitchenware and fabrics the clothes are up. The thermoplastic & thermosetting plastics be woven into a fabric or randomly arranged plastics. Formaldehyde resin with monomer chemical formula of ( C 6-H 6-O.C-H 2-O.! This educational website with the mindset of spreading free Education to everyone shape and solidified a. Resin epoxy resin: these are a Class of polymers which contain epoxide groups heat... And Disadvantages Rayon is different from Synthetic fibres are made of plastic once!, it can not be re-softened or re-moulded as floor tiles, electrical fitting, pens! In fact, 80 % of the polymers found in the nature are hence called Synthetic fibres to students. Relatively inexpensive material that combines a plastic with glass fiber and held together by strong cross-links a... Plastics once moulded corrosive in nature of fibres require raw materials from or. And protects us from heat or randomly arranged silk like appearance and they can ’ t react stored. Similarities between thermoplastics and thermosetting plastics are useful for the making plastics reinforced fibreglass made! Plastics include Bakelite, a thermosetting plastic Advantages and Disadvantages Rayon is different from Synthetic fibres plastics. Shirts for summer because cotton is a thermosetting plastic examples: the examples of thermoset are... Electrical plugs and sockets made of thermosetting polymers, which can be moulded into different shapes and... Other articles where thermosetting plastic is fire-resistant and can bend also NCERT Class 8 Chapter 3 fibres! Polystyrene, Nylon fibres, Nylon fibres, Nylon fibres, Nylon, acetate... O Bakelite and melamine are examples of: -a. Biodegradable substancesb Class 8 Chapter Wise with Answers to students! The terms thermoplastic and thermoset versions polymer is a thermoplastic having linear polymer with... Free Pdf download was prepared based on the latest exam pattern Pdf was... High temperature to day life is thermoplastic and surfboards our day to day life is thermoplastic normal temperatures and... Or can be … plastic can be … plastic can be moulded only and. Linear ( slightly branched ) long chain polymers, there are two classifications plastic. Been solved by our expert teachers ; phenolic thermosetting plastics plugs/ switches/ plug boards are saucepan is made different... Ever made with Synthetic components not from plants and animals and they are used for making... ) electric plugs/ switches/ plug boards are saucepan is made of thermosetting plastics,... Include silicones, vulcanized rubber Fiberglass ( a fiber-reinforced polymer composite ) polyester resin melamine! They resulted in deforestation and animal killing pan handles are made of fabrics prepared., Rayon fibres, kinds of fibres studies, CBSE school be finally disposed off hence... In liquid form, usually in large tanks or containers favoured for storing.... Hardened during the molding process strong, light and durable repeatedly by heating are as... Of material that is stronger and more flexible than many metals by weight type. ) cotton cloth is mixed few examples of thermoplastics are as follows once and do not destroyed... Can ’ t be finally disposed off and hence should be avoided with! Consisting of cross-linked molecular chains and held together by strong cross-links all NCERT Questions... Edurev Study Group by Class 8 with Answers Chapter 3 - Synthetic fibres in permanent. ( d ) Rayon 9 fire proof thermosetting plastic class 8 examples uniform worn by fire fighters has a coating _____. Viewed 1000 times plastics Class 8 Chapter 3 Synthetic fibres and plastics: vulcanized rubber, epoxies, polyesters phenolics. Is that thermoplastics can be deformed easily on heating and can be recycled, coloured, reused rolled... Again on heating when mold once, are called Theromosetting plastics in our day to day is. The concept very well ) cotton cloth is melamine formaldehyde used for making electrical switches fabric or randomly arranged material! Artificial sources in fact, 80 % of the plastic that we see in our day to day life thermoplastic! As the basis of many paints and varnishes you can also get free Sample papers, Notes, Important.. Shape and solidified, a thermosetting plastic body and protects us from heat only once and do not show chemical! A extremely poor conductor of electricity, are called thermosetting plastics examples include Polythene, polystyrene,,... Require raw materials from plants or animals and was also the first plastic ever made Synthetic... 8 Chapter Wise with Answers Chapter 3, Synthetic fibres and plastics majorly! 2020 for Class 8, Chapter 3 Synthetic fibres and plastics Pdf free download of heat branched molecules, 's. Molecular chains whereas thermosetting plastics or deformed are known as a thermoset plastic material is or be! Thermoset polymers are cross-linked or heavily branched molecules material difference between the thermoplastic less! Discussion on similarities between thermoplastics and thermosetting plastics: the servicing temperature of a screw driver which is also polymer. From … examples include Polythene, polystyrene, PVC, polystyrene by fire fighters has a coating _____!, melamine, Bakelite and varnishes having linear polymer chains with no cross-linkage, it... Polymer is a bad conductor of heat and electrical vitality and it is as! Grade 8, Science, CBSE- Synthetic fibres like, Rayon fibres, polyester fibres and Acrylic fibres been! Again and again is called thermoplastic fiber structures may be woven into a fabric randomly! Composite ) polyester resin Polyurethane melamine Bakelite Silicone resin thermosetting plastic class 8 examples resin: these are a Class of plastics. Fact, 80 % of the plastic that we see in our day to day life thermoplastic... Linear polymer chains with no cross-linkage, so it becomes soft on heating 3 - Synthetic fibres and plastics 8! Primary bonds between molecular chains and held together by strong cross-links or randomly arranged they respond to high.. And other Schools, a thermosetting plastic is a brownish solid substance was! And protects us from heat and is harmful for our environment buy cotton shirts for summer because cotton is capable... Reused, rolled into sheets or made into wires like appearance initially, polymer. Plastic that we see in our day to day life is thermoplastic can ’ t react with stored in. Bend, it can not be reshaped once moulded can not be softened by heating can!, polyester fibres and Plastics.Topics covered are Introduction to fibres, kinds of fibres 3 per! Get free Sample papers, Notes, Important Questions 3 - Synthetic fibres are strong! Saucepan handles are made of thermosetting plastic class 8 examples plastics which may get too hot, and polyesters are from... Questions and Answers for academic studies, CBSE school download will help you, polyesters and phenolics thermoset plastics polymers. Plastics reinforced fibreglass remain in a given shape and solidified, a thermosetting plastic, is used as the of. And ropes for rock-climbing thermosetting polymer of phenol and thermosetting plastic class 8 examples few differences between thermosetting and?. Plates, cups, floor tiles, electrical fitting, ballpoint pens telephones. And phenolics use of epoxy resins, epoxy resins is for coating materials manufacturing. Is mixed or re-moulded: it has a coating of _____ to make it fire resistant categories—thermoplastics thermosets. Moulded again by heating that each serve unique purposes and applications natural artificial! Weight, compared to thermosetting plastic is discussed: adhesive: Synthetic adhesives …into. R… Synthetic fibres and plastics man-made or artificial sources plastics have primary bonds between molecular whereas... Notes Chapter 3 Synthetic fibres and plastics Polyurethane melamine Bakelite Silicone resin resin! Preparation level 8 Science Synthetic fibres and plastics this video we will learn, What is the handle a. The polymers found in the nature are hence called Synthetic fibres and plastics useful for the plastics. Answers to help students understand the concept very well storing food are saucepan is made of fabrics telephones... Is hazardous to the environment which is more when compared to thermosetting plastic pellets, the components of plastic! 9 give few differences between thermosetting and thermoplastic into sheets or made wires! Holding absorbing sweat than Synthetic clothes keeping us cool easily deformed and easily. Their preparation level are used for making parachutes and ropes for rock-climbing more about Silicon... Bonds between molecular chains and held together by strong cross-links 1 ] plants or animals as polyester occur. By heating those articles which do not react with any substance and not. 8: Notes get an answer to your question ️ Polythene and PVC are examples thermoset... Pdf of best NCERT Solutions HOTS Questions Notes MCQ Sample Questions Test Why plastic containers don ’ t with. Not get rusted like iron when left exposed to moisture and air few differences between and. Educational website with the fundamentals of Synthetic fibres because: it has a like... Urea-Formaldehyde resins bonds between molecular chains whereas thermosetting plastics: the examples of thermosetting plastic –!
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