☺ these plastics molded ones and can be softened by heating. 8 Bakelite and Melamine are examples of. (d) 0 to 2 are substituents selected from the group consisting of Z--CH 2--O--CH 2-- and Z--CH 2--, wherein Z is a melamine group of the formula ##STR2## The substituted melamine additives are useful as additives in molding compositions based on thermosetting condensation resins to improve the moldability of the composition. Epoxy bushings and insulators 2. Few examples of thermosetting plastics are: phenolic resins, epoxy resins, amino resins, melamine, Bakelite. Melamine : It is an organic base with a trimer of cyanamide having a 1,3,5-triazine skeleton with the formula of C 3 H 6 N 6. Thermosetting polymers are polymers that keep their shape once they have been set. (a) Protein Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. Although thermosetting plastics cannot be melted into new products, they can still be reused for other applications. Explain why, thermoplastics become soft on heating but thermosetting plastics do not become soft on heating. At room temperature, they are available in the form as liquids. Many adhesives (glues) are thermosetting plastics. Melamine is a compound used in some plastic products, such as dishes, utensils, and more. Thermosetting plastic recycling. The word thermosetting literally translates to something which sets permanently upon heating. Choose the correct answer: The synthetic plastic used for making insulation cover in electrical wires and cables is . Why are electric witches, plugs and sockets made of thermosetting plastics? Mr.Mukherjee. Related Articles: Examples of thermosetting plastics are- melamine- used for making fire ressistant fabrics and floor tiles. Polyurethane foam 3. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. 3) Vulcanization rubber is an example of elastomers. Learn more. Some characters of thermosetting polymers: these polymers are cross-linked or heavily branched molecules, on heating it undergoes extensive cross-linking in moulds and again become infusible, 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. Thermosetting substances can be melted and formed into shapes that become hard and cannot be…. Pupils can then try the ‘quiz time’ questions to test their thermosetting plastic knowledge. For example: Bakelite and melamine. 37. Design and technology: Pupils can revise or learn about thermosetting plastics including; Epoxy resin, Melamine formaldehyde, Polyester resin, Urea formaldehyde and Bakelite, etc. and can only be formed once. Which term is used for polymers made up of a large number of glucose units? In its most basic form, melamine is an organic compound that when combined with formaldehyde forms a durable thermosetting plastic. Urea and Bakelite switches 5. Thermosetting plastics: The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. thermosetting meaning: Thermosetting substances can be melted and formed into shapes that become hard and cannot be melted…. Rubber is an example of a thermosetting polymer. It is used to make electrical switches and handles of utensils. d) Rayon 9 Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. Melamine is one of the thermosetting plastics that can be made in unlimited colours. Explain the difference between thermoplastics and thermosetting plastics. Thermosetting plastics have an excellent aesthetic appearance. Which of the following are thermosetting polymers? A thermosetting resin, or thermoset, is a polymer which cures or sets into a hard shape using curing method such as heat or radiation. Free PDF Download of CBSE Science Multiple Choice Questions for Class 8 with Answers Chapter 3 Synthetic Fibres and Plastics. In its butylated form, it is dissolved in n … Heat provides energy for chemical reactions that increase the cross-linking between polymer chains, curing the plastic. The major application is for stressed joints at somewhat elevated temperatures. Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). Bakelite is a very poor conductor of heat and electricity and it is used for making electrical switches. Melamine is one of the thermosetting plastics that can be made in unlimited colours. Some other examples of thermoset plastic polymers include silicones, vulcanized rubber, epoxies, polyesters and phenolics. Is it thermoplastic or thermosetting plastic? b) Rayon. ... Bakelite is an example of (a) fibre (b) elastomer (c) nylon (d) thermosetting polymer. Thermoset plastics are also found in polyester resin that is … We'll discuss whether it's safe to use and any risks. 7. c) Melamine plastic. Answer: d Explaination: (d) Bakelite is cross linked thermosetting polymer of phenol and formaldehyde. Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. Melamine is a compound used in some plastic products, such as dishes, utensils, and more. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. Design and technology: Pupils can revise or learn about thermosetting plastics including; Epoxy resin, Melamine formaldehyde, Polyester resin, Urea formaldehyde and Bakelite, etc. 1 Answer. It has its roots in natural gas, which is processed to ammonia and further to urea. Melamine is resistant to fire and is hence used for making utensils. Because thermosetting resin adhesives, when cured, are densely cross-linked, their resistance to heat and solvents is good, and they show little elastic deformation under load at elevated temperatures.Bonds are able to withstand temperatures of 93–260°C and peel strength is fair. Explain the difference between thermoplastics and thermosetting plastics. 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