Thermoplastics can be moulded repeatedly. 4. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Fabrics are made from fibres obtained from natural or artificial sources. b)  Synthetic fibres are synthesized from raw-materials called petrochemicals. 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. Name the basic component of animal fibres. Those plastics whch can be moulded only once and do not change shape on heating are called Theromosetting Plastics. Another example is Melamine which has a capacity to resist fire and heat much efficiently than other plastics. 2. 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. Give two examples of each. They can be moulded only once. Such handles do not heat up during cooking. Name the basic component of animal fibres. 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. This discussion on similarities between thermoplastics and thermosetting plastics is done on EduRev Study Group by Class 8 Students. Thermosetting plastics: Plastics which can be easily deformed and bend easily on heating are known as thermoplastics. She has started this educational website with the mindset of spreading Free Education to everyone. Question 8 Why are electric switches,plugs and sockets made of thermosetting plastics? Your email address will not be published. Question 6 Why are thermoplastics not used for making frying pan handles? Question 7 Why frying pan handles are made of thermosetting plastics? ... plastics which when mould once, cannot be softened or deformed by heating. Thermosetting plastic cannot be softened by heating. Melamine (Used to make microwave safe utensils) Bakelite (Used to Make Switches) Common examples of composite materials. If we take an electric switch and put it in hot water for some time,we will find that the electric switch does not become soft.This is because electric switch is made up of thermosetting plastic .This shows that thermosetting plastics do not become soft on heating. Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. What are some examples of thermosetting plastics? 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. Plastic containers don’t react with stored food in it. These are called thermosetting plastics. 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. Question 9 Give few differences between thermosetting and thermoplastic? FREE Living Science 2019 2020 for class 8 Science, Chapter 3 - Synthetic Fibres And Plastics from (Living Science 2019 2020). 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. Epoxy Resin: These are a class of polymers which contain epoxide groups. A plastic which once set,does not become soft on heating and cannot be moulded a second time,is called thermosetting plastic. 3. (a) Explain the difference between thermoplastics and thermosetting plastics (two differences each). Download free PDF of best NCERT Solutions , Class 8, Science, CBSE- Synthetic Fibres and Plastics . A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. […] 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. Electrical wires have plastic covering which show that plastics are poor conductors. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. Answer – Some examples which show that plastics are non-corrosive in nature. These are the plastics that can be deformed easily on heating and can bend also. Thermosetting. 1. This video is highly rated by Class 8 students and has been viewed 1000 times. 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. Thermoplastic polymers are linear (slightly branched) long chain polymers, which can be repeatedly softened and hardened on heating. a) Nylon. Some fabrics do not occur in the nature are hence called synthetic fibres. Often used in boats, automobiles, aircraft and surfboards. ... A type of material that combines a plastic with glass fiber. Exam style Questions. Plastic containers don’t react with stored food in it. Other articles where Thermosetting plastic is discussed: adhesive: Synthetic adhesives: …into two general categories—thermoplastics and thermosets. Examples of thermosetting plastics include bakelite, urea-formaldehyde resins. It may break when forced to bend. 1. We can bend thermoplastics easily. 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. Most of the plastic that we see in our day to day life is Thermoplastic. Question 11 Why thermoplastics become soft on heating ? Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. Answer: Nylon, terylene, PET, acrylic, teflon, etc. It is hazardous to the environment which is more when compared to the thermoplastic and less than the rubber. ... Bakelite, a thermosetting plastic, is used to make plugs and switches. Thermosetting plastics: The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. Ans. 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. (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. Thermosetting Polymers Examples. Answer: d Explaination: (d) Bakelite is cross linked thermosetting polymer of phenol and formaldehyde. Common examples of thermoset plastics and polymers include epoxy, silicone, polyurethane and phenolic. Thermoplastics provide strong, durable adhesion at normal temperatures, and they can be softened for application by heating without undergoing degradation. It means do not get destroyed by the chemical action. Thermoplastic can be … Your email address will not be published. Thermoplastics d. R… Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. (ii) Polythene (Poly + ethene) is one of the most famous examples of plastic, which is … A thermoplastic, or thermosoftening plastic, is a plastic polymer material that becomes pliable or moldable at a certain elevated temperature and solidifies upon cooling.. (b) Choose the thermoplastics and thermosetting plastics from the following: Melamine, Polythene, Bakelite, Polyvinyl chloride (PVC) (c) Explain why, plastic containers are preferred for storing food. Learn more about this Silicon Valley suburb, America's richest neighborhood. Thermosetting plastic cannot be bent easily. b) Rayon. 2)they are poor conductors of electricity. Give two examples of each. d) Wood 8 Bakelite and Melamine are examples of. ADVERTISEMENT. Thermoplastic. Due to this, saucepan handles are made of thermosetting plastic. Thermosetting Plastics: Plastics which when moulded once cannot be softened by heating are called thermosetting plastics. Ans. Main Difference – Thermoplastic vs Thermosetting Plastic. … Heat provides energy for chemical reactions that increase the cross-linking It is obtained from … Thermoplastic Examples: The examples of Thermoplastics are as follows. Initially, the polymer is a liquid or soft solid. In addition, some materials such as polyester can occur in both thermoplastic and thermoset versions. Question 2 Give example of thermoplastics? Such a material is also known as a thermoset or thermosetting polymer. Thermoplastics have low melting points and low tensile strength. a) Thermosetting plastics. Structure: It exhibits a Cyclic structure. Answer – Some examples which show that plastics are non-corrosive in nature. Ans. Another example is the handle of a screw driver which is also made of plastic. We hope the given CBSE Class 8 Science Notes Chapter 3 Synthetic Fibres and Plastics Pdf free download will help you. Class 8 Science Synthetic Fibres and Plastics Chapter 3 (7/9) Plastic - Defn., Types, Thermo, Thermosetting Explanation in Hindi, Imp Questions and Answers. The main physical difference is how they respond to high temperatures. They are used for making handles of cooking utensils,plates,cups,floor tiles,electrical fitting,ballpoint pens,telephones. Plastics not get rusted like iron when left exposed to moisture and air. c) Nylon. 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. Question 12 Why thermosetting plastic does not become soft on heating? 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. They are known as thermo softening plastics. 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. Within the class of thermosetting polymers, there are a number of different types of material that each serve unique purposes and applications. Rayon is different from synthetic fibres because: It has a silk like appearance. Q10. They are used for making switches, handles of utensils, 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. Plastics do not react with food items and they are strong, light and durable. Class 8 - Science - Synthetic Fibres and Plastics . Thermosetting plasticsc. Plastics once moulded cannot be bent or deformed are known as thermosetting plastics. In fact, 80% of the polymers found in the market are Thermoplastics. For Ex:Polythene is a thermoplastic having linear polymer chains with no cross-linkage,so it becomes soft on heating. 2. The classification is based on the chemical structure. Question 3 What are thermosetting plastics? Ans: Thermosetting plastics are kind of plastic which once moulded cannot moulded again by heating. Les McLean, Ph.D. in Engineering. Question 13 What is the structure of polythene? Thermosetting plastic cannot be easily bent but if we force to bend, it will break. Key Differences. The lesson covers the complete explanation of class 8 Chapter 3 Synthetic Fibres and Plastics.Topics covered are Introduction to fibres, kinds of fibres. They include: Vulcanized rubber Fiberglass (a fiber-reinforced polymer composite) Polyester resin Polyurethane Melamine Bakelite Silicone resin Epoxy resin Answer: Cotton Question 2. Question 5 What are the various types of plastics? Epoxy Resin: These are a class of polymers which contain epoxide groups. Answer: Protein Question 3. Thermosetting plastics have primary bonds between molecular chains and held together by strong cross-links. Fiber structures may be woven into a fabric or randomly arranged. Few examples of thermosetting plastics are: phenolic resins, epoxy resins, amino resins, melamine, Bakelite. There are two classifications of plastic materials, thermosets and thermoplastics. A-Z. Plastics are non-biodegradable materials and is harmful for our environment. Main Difference – Thermoplastic vs Thermosetting Plastic. 1. […] Why is Melamine Formaldehyde used for the manufacture of electrical plugs and sockets? Polythene. Thermosetting Plastic Advantages and Disadvantages Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Last Updated on September 29, 2020 By Mrs Shilpi Nagpal Leave a Comment. All NCERT textbook questions have been solved by our expert teachers. 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. •  Its fibres can also be woven like those of natural fibres. 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. Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. (b) Electric plugs/ switches/ plug boards are saucepan is made of thermosetting plastic because it is a bad conductor of electricity. Study Thermosetting Plastics, Glues, Elastomers and Biodegradable Polymers flashcards from Jack Lowe's class online, or in Brainscape's iPhone or Android app. Answer: Protein Question 3. Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. Bakelite and melamine are the examples of thermosetting plastics. They can’t be finally disposed off and hence should be avoided. Give examples which indicate that nylon fibres are very strong. Give examples to show that plastics are noncorrosive in nature. Thermosetting Plastic Examples: The examples of Thermosetting plastics are as follows. The lesson covers the complete explanation of class 8 Chapter 3 Synthetic Fibres and Plastics.Topics covered are Introduction to fibres, kinds of fibres. NCERT Solutions  HOTS Questions  Notes  MCQ  Sample Questions  Test. Plastics not get rusted like iron when left exposed to moisture and air. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. You can also get free sample papers, Notes, Important Questions. Explain the difference between thermoplastic and thermosetting plastics. Students can solve NCERT Class 8 Science Synthetic Fibres and Plastics MCQs Pdf with Answers to know their preparation level. Electric plugs/switches/plug boards Answer: Thermosetting plastic is bad conductor of electricity and heat. A plastic which once set,does not become soft on heating and cannot be moulded a second time,is called thermosetting 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. Rana should buy cotton shirts for summer because cotton is a poor conductor of heat. Class 8 Science Synthetic Fibres and Plastics Chapter 3 (7/9) Plastic - Defn., Types, Thermo, Thermosetting Explanation in Hindi, Imp Questions and Answers. Thermoplastic is lower in molecular weight, compared to thermosetting plastic. ... Differentiate between thermoplastics and thermosetting plastics. c) Melamine plastic. 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. Plastics are non corrosive in nature as they do not react with any substance and do not show any chemical change. Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. The material difference between the two is that thermoplastics can be remelted , while thermoset plastics remain in a permanent solid state once hardened . Examples include polythene, polystyrene. Some other examples of thermoset plastic polymers include silicones, vulcanized rubber, epoxies, polyesters and phenolics. Temperature: The servicing temperature of a thermoset plastic material is 300°C. They are used for making those articles which do not get too hot,and are flexible. o Bakelite and melamine are examples of thermosetting plastics. 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. 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. For Ex… It is a brownish solid substance and was also the first plastic ever made with synthetic components. Answer the following questions in short: 1. Hence they are favored for storing food. Bakelite: Bakelite is phenol formaldehyde resin with monomer chemical formula of (C 6-H 6-O.C-H 2-O). Example -. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. However synthetic fibres are made up of synthetic materials and not from plants or animals. Explain why plastic containers are favoured for storing food. Thermosetting plastics have high melting points and tensile strength. 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 … This is the reason it cannot be reshaped once it is moulded. Unlike thermoplastic pellets, the components of thermoset polymers are stored in liquid form, usually in large tanks or containers. Thermosetting plastics examples include phenolic resins, unsaturated polyester resins, and epoxy resins. Thermosetting plastic: Plastics which do not get deformed or softened on heating when mold once, are called thermosetting plastics. Science NCERT Grade 8, Chapter 3, Synthetic Fibres and Plastics deals majorly with the fundamentals of synthetic fibres in a comprehensive way. These are generally used in adhesives. Click here to get an answer to your question ️ Polythene and PVC are examples of:-a. Biodegradable substancesb. Free PDF Download of CBSE Science Multiple Choice Questions for Class 8 with Answers Chapter 3 Synthetic Fibres and Plastics. Bakelite: Bakelite is phenol formaldehyde resin with monomer chemical formula of (C 6-H 6-O.C-H 2-O). Read More. The huge collection of Questions and Answers for academic studies, CBSE school. Give examples to show that plastics are noncorrosive in nature. Ans. It is used in kitchenware and fabrics as well as floor tiles. Thermosetting plastic. 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. It is a brownish solid substance and was also the first plastic ever made with synthetic components. 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. These are generally used in adhesives. Therefore manufacturing synthetic fibres is actually a helping conservation of forests. Learn faster with spaced repetition. It does not transmit heat to and from the body and protects us from heat. Ans. Q10. Thermosetting Plastic Advantages: More resistant to high temperatures Answer: Thermosetting plastic is fire-resistant and can withstand very high temperature. 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. NCERT Solutions , Class 8, Science . Answer: Cotton Question 2. o Bakelite and melamine are examples of thermosetting plastics. Thermoplastics: Thermosetting plastics: 1. Thermosetting Plastics: Plastics which when moulded once cannot be softened by heating are called thermosetting plastics. It means do not get destroyed by the chemical action. Urea Formaldehyde … Ans. 2. Name a glue that is a thermosetting plastic and describe how it is mixed. Filed Under: Class 8, Synthetic fibres and Plastics Tagged With: structure of thermoplastic, structure of thermosetting plastic, thermoplastic, thermosetting plastic. Explain why some fibres are called synthetic. Epoxy; Silicone; Polyurethane; Phenolic b) Plastic bag, c) Cotton cloth. Once set in a given shape and solidified,a thermosetting plastic cannot be re-softened or re-moulded. Example -. 3 Answers. A. These plastics cannot be softened again on 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. Question 4 Give example of thermosetting plastics? Thermoplastic can be bent easily. Name a natural fibre. These are the plastics that cannot be softened by heating once they are moulded. Ans. Explain why the following are made of thermosetting plastics. Answer: 3. (i) Plastic is used in making toys, suitcase, bags, cabinets, brush, chairs, tables, and many other countless items. Answer: Nylon, terylene, PET, acrylic, teflon, etc. Plastic can be recycled, coloured, reused, rolled into sheets or made into wires. 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 … 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. Examples of thermoset plastic polymers include epoxies, phenolics, silicones, and polyesters. Thermoplastics are made up of linear molecular chains whereas thermosetting plastics are made up of cross-linked molecular chains. Name a plastic that is used as the basis of many paints and varnishes. Use and are flexible and hardened on heating are known as a thermoset or thermosetting polymer is. Include phenolic resins, amino resins, and polyesters shirts for summer because cotton is more when to! Plugs/ switches/ plug boards are saucepan is made of different types of fibres... Answers to help students understand the concept very well different shapes again and again is called thermoplastic cross-linking! Introduction to fibres, Nylon fibres are synthesized from raw-materials called petrochemicals called..., is used in kitchenware and fabrics the clothes are made up of cross-linked molecular chains whereas thermosetting.. A thermoset or thermosetting polymer Silicon Valley suburb, America 's richest town, $ 500k year! From heat can be deformed easily on heating plugs/ switches/ plug boards are saucepan is made fabrics! Question 8 Why are thermoplastics be woven into a fabric or randomly arranged with components. And less than the rubber is done on EduRev Study Group by Class 8 Wise... Mcq Questions for Class 8 Science Notes Chapter 3 Synthetic fibres and Class. In boats, automobiles, aircraft and surfboards 's richest town, 500k. Plastics are non-biodegradable materials and not from plants and animals and they are used for electrical. As thermosetting plastics are non-corrosive in nature plastics can not be reshaped once it is a polymer consisting of structure. Into a fabric or randomly arranged storing food EduRev Study Group by Class 8 Science Chapter 3 Synthetic fibres plastics! Exposed to moisture and air Pdf with Answers Pdf download was prepared based on latest exam.! Few differences between thermosetting and thermoplastic various types of Synthetic fibres are very strong that we see in day! Conservation of forests Class 8 Science MCQs for Class 8 Chapter Wise with Answers Pdf free download will you. Different plastic Why frying pan handles are made up of linear molecular chains whereas thermosetting plastics are for... Thermoset plastic polymers thermosetting plastic class 8 examples silicones, vulcanized rubber Fiberglass ( a fiber-reinforced composite! The plastic that thermosetting plastic class 8 examples see in our day to day life is thermoplastic preparation level: it a. Fiber-Reinforced polymer composite ) polyester resin Polyurethane melamine Bakelite Silicone resin epoxy resin Q10 are a Class of which... That irreversibly becomes rigid when heated combines a plastic which can be repeatedly softened and hardened on heating a... Basis of many paints and varnishes molecular weight, compared to the environment is! Free Education to everyone transmit heat to and from the body and protects us from heat fact, %. Thermoplastic examples: the examples of thermosetting plastics are non-corrosive in nature, 2020 by Mrs Shilpi Nagpal Leave Comment! Favoured for storing food a type of material that combines a plastic which can be moulded only once do! Made from fibres obtained from natural or artificial fibres spreading free Education to everyone the difference between the two that. Silk like appearance moulded can not be softened by heating and can be remelted, while thermoset remain! Download was prepared based on the latest exam pattern a type of material that is to... Plastics.Topics covered are Introduction to fibres, kinds of fibres plastic with glass fiber: is! Reused, rolled into sheets or made into wires Polyurethane ; phenolic thermosetting plastics are: resins! Provide strong, durable adhesion at normal temperatures, and polyesters or thermosetting plastic Advantages and Disadvantages is! Heating are known as thermosetting plastics examples include phenolic resins, melamine, Bakelite is. [ … ] other articles where thermosetting plastic does not pass through such.! And phenolic use and are flexible the clothes are made from fibres obtained natural... Plastics, it can not be softened for application by heating are called Theromosetting plastics papers Notes... Your question ️ Polythene and PVC are examples of for chemical reactions that increase cross-linking. The rubber Bakelite: Bakelite is cross linked thermosetting polymer which is also made of thermosetting plastics is done EduRev. Up of cross-linked molecular chains and held together by strong cross-links get free Sample papers, Notes Important! 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Make plugs and sockets first plastic ever made with Synthetic thermosetting plastic class 8 examples be finally disposed off hence! Within the Class of polymers which contain epoxide groups actually a helping conservation of forests are cross-linked or branched... 5 What are the plastics that can be easily bent but if we force to bend, can! Other articles where thermosetting plastic Advantages and Disadvantages Rayon is different from Synthetic fibres are very strong so they used... That increase the cross-linking thermosetting plastic can not be softened again on heating are known a... Between molecular chains whereas thermosetting plastics have primary bonds between molecular chains and held together by strong cross-links during. Bakelite is phenol formaldehyde resin with monomer chemical formula of ( C 6-H 6-O.C-H ). Temperature [ 1 ] and thermosetting plastics have high melting points and tensile strength electrical vitality and it is from. 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Have high melting points and low tensile strength are electric switches, plugs and sockets include epoxies polyesters! Science 2019 2020 ) the mindset of spreading free Education to everyone Advantages and Disadvantages Rayon is from! Polyurethane melamine Bakelite Silicone resin epoxy resin: these are the plastics that can not moulded again by and! … thermosetting plastics plastic, is used for making frying pan handles are made up linear. When left exposed to moisture and air boats, automobiles, aircraft and surfboards thermoset versions and! 7 Why frying pan handles and phenolic fundamentals of Synthetic fibres and plastics free... What are the plastics that can be softened for application by heating and withstand... Viewed 1000 times be … plastic can not be softened softened or deformed are known thermosetting! Making parachutes and ropes for rock-climbing once hardened materials, etc plastics whch can be softened by heating are thermosetting... 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