Plastics are used to convey chemicals. There is a plastic suitable for almost any application. Thermoplastic : Plastics that can be deformed easily upon heating and can be bent easily. HOW TO INCREASE REPETITION VALUE OF PLYWOOD? HYDROMETER ANALYSIS OF SOIL – WHAT, WHY & HOW? Plastics are clean, light and shining, so they need not be given any finish such as painting, polishing etc. It should also be noted that each plastic material has its own peculiar properties to suit the various uses. Polyamides contain repeating amide linkages i.e. The plastics, have low specific gravity, the average being 1.3 to 1.40. Polyamides or Nylon is the major engineering and high performance thermoplastics class because of its good balance of properties. Typical reactions for chain assembling are polyaddition (continuous or step wise) and condensation polymer-ization (polycondensation) [1] (Figure 1.1).. Plastics come from polymers, hence all plastics are polymers, but not all polymers are plastic. Synthetic fibres … Plastic is lighter than metals so they are also used in Aircrafts and Cars Your email address will not be published. Hence the success of plastic as an engineering material for a particular purpose will depend upon the correct choice of the variety. The properties of plastic are numerous. CBSE 8 Science. Certain plastics are seriously affected by ultraviolet light. Some plastics also react chemically with other reactants. 6. 7. The maximum amount of light to pass through the material, therefore, they are transparent materials. Synthetic Fibres and Plastics. Plastic, polymeric material that has the capability of being molded or shaped. Plastics don't corrode, though they can degrade in UV, a component of sunlight, and can be … I believe that the mystery plastic, which for me was orange, was the same type of plastic as the green plastic. Plastics possess excellent insulating property, so used as electric insulators. This property depends upon variety of plastics used, for example, cellulose plastics are considerably affected by the presence of moisture, whereas polyvinyl chloride plastics offer high resistance to moisture. Sorry, your blog cannot share posts by email. 3. 2) They are softer than nylon fibres. Please enable Cookies and reload the page. Class-8 » Science. Students who are in Class 8 or preparing for any exam which is based on Class 8 Science can refer NCERT Science Book for their preparation. Discuss safety procedures specific to each test. 8.Plastics arrangement is _____ (a)Linear (b)Cross linked (c)Linear as well as cross linked (d)None of these. Plastics, being organic in nature, are combustible. Material Properties of Plastics 1.1 Formation and Structure The basic structure of plastics (or polymers) is given by macromolecule chains, formulated from monomer units by chemical reactions. Characteristics of Synthetic Fibres. Plastic is light,strong and durable Plastics are light in weight,easily available,good in strength and long lasting (durable) Example-Plastic containers are used for storing food,water,pickles and soft drinks. 2. And much more. Answer: Nylon, terylene, PET, acrylic, teflon, etc. Polymer: The term polymer id derived from two greek words POLY meaning many and MER meaning units.Therefore polymer refers to combination of repeating units. 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. All operations like drilling, sawing, punching, clamping etc are carried out easily … All operations like drilling, sawing, punching, clamping etc are carried out easily on plastics, just like wood. Cloudflare Ray ID: 60766ad3e945f999 Synthetic Fibres and Plastics - Chapter Wise CBSE Solved Question and Answer Based On NCERT. Transparency/Opaque: The amount of light material allow passing through it is transparency of the material. Phenol formaldehyde and urea formaldehyde plastics are used as fire proofing materials. Filed Under: Class 8, Synthetic fibres and Plastics Tagged With: artificial silk, rayon, semi-synthetic fibre, uses of rayon, viscose About Mrs Shilpi Nagpal 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. Synthetic Fibres and Plastics Class 8 Science Chapter 3 - Synthetic Fibres and their Properties. 9. The versatility of plastic materials comes from the ability to mold, laminate or shape them and to tailor them physically and chemically. The success of plastic as an engineering material will depends up on the selection of variety of plastic. Short Q&A: Q1: Differentiate between natural and artificial fibres. Plastics, generally, have low ductility and hence plastic structural members may fail without prior warning. Properties of Polyester 1) They are stronger than nylon fibres. 1. Following are the general properties of plastics. It is formed by condensing identical units, copolymers for different units. Video what are the properties of plastic ? 4. 10.Name the plastic, which deformed easily on heating and can be bent easily. For the most part, they are: Lightweight with a high strength-to-weight ratio; Can be manufactured inexpensively and mass produced; Water resistant; Shock resistant; Thermally and electrically insulating; Metal vs Plastic Polyvinyl chloride (PVC) plastics are non-inflammable. Linear polymers and a combination of linear and cross-linked polymers come under thermoplastics. 16. Plastic as structural material has not gained much popularity because of the following resins. Examples: Plastic, Air, and Glass. Don't worry! The plastics have low thermal conductivity and therefore foamed or expanded varieties of plastics are used as thermal insulators. • Plastic material is essential for any construction. Synthetic Fibres and Plastics. But the resistance to fire temperatue depends upon the plastic structure. Class 8 Science Chapter 3 LearnFatafat. Synthetic fibres are cheaper than natural fibre. Some properties of plastics include their light weight, high resistance to various chemicals, thermal and electrical insulation and their wide range of colors, characteristics and potential uses. Plastic is a synthetic material made from a wide range of organic polymers such as polyethylene, PVC, nylon, etc., that can be moulded into shape while soft, and then set into a rigid or slightly elastic form. –CO-NH–. Living Science Solutions for Class 8 Science Chapter 3 Synthetic Fibres And Plastics are provided here with simple step-by-step explanations. Properties of Plastics as a Construction Material. Plastics offer great resistance to moisture, chemicals and solvents. They are poor conductors of heat and electricity. Plastics generally possess sufficient durability, provided they offer sufficient surface hardness. PLASTIC 1. The lesson covers the complete explanation of class 8 Chapter 3 Synthetic Fibres and Plastics.Topics covered are Introduction to fibres, kinds of fibres. The plastics that act as insulators mostly have a high dielectric strength. 6 PROPERTIES OF CONCRETE USED BY DESIGNERS, Design procedures for a Building Foundation (Step by Step), 10 PRACTICAL PROBLEMS TO THINK BEFORE DESIGNING A FOUNDATION. Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. explains properties like plastic is nonreactive, plastic is light strong & durable, etc for CBSE Class 8 Science. Post was not sent - check your email addresses! In addition to above properties, plastics have following qualities. Name some artificial fibres. Plasticized or Flexible PVC (Density: 1.1-1.35 g/cm3): Flexible PVC is formed by the addition of compatible plasticizers to PVC which lower the crystallinity. The plastics posses excellent electric insulating properties. They are light weight, smooth and soft than any other fibre. Plastics are nothing but synthetic organic high polymers. A) It is non-reactive. 7 FACTORS INFLUENCING REBOUND HAMMER TEST OF CONCRETE. They possess good optical and sound absorption qualities. 3) They are strong,wrinkle resistant,easy to wash and dry,not attacked by moths,has high abrasion resistance,suitable for making dress material. HOW TO BLEND AGGREGATE USING FINENESS MODULUS VALUE? To know more about me just visit AboutMe, How to make plastic powder for the project about partial replacement of sand with plastic powder.we dont have any machines for making of plastic powder…please explain the solution for my problem, you should also mention the graph of plastic material. Depending on physical properties, plastics are divided into two types: Thermoplastic and thermosetting. This property of plasticity, often found in combination with other special properties such as low density, low electrical conductivity, transparency, and toughness, allows plastics to be made into a great variety of products. You can connect me on Google +. Cotton is a natural polymer known as cellulose which is composed of large number of glucose units. 3. Characteristics of synthetic fibres. NCERT Book for Class 8 Science Chapter 3 Synthetic Fibers and Plastics is available for reading or download on this page. Use our interactive properties table below to explore by property group, sort, or compare two or more plastic materials. Available in many colors and in transparent form, plastics can be rubbery or rigid. CBSE Science Class 8. large molecule or a macromolecule which essentially is a combination of many subunits It is important to know the general outstanding properties of plastics to make best use of this an engineering material. Which of the following properties of plastic makes it most convenient for use? The plastics are sufficiently strong and can be used for load bearing structural members. Name the basic component of animal fibres. The strength of plastics can further be increased by reinforcing them with various fibrous materials. 8. You can follow me on Instagram. Answer: Protein Question 3. Synthetic fibres possess following unique characteristics: They are durable and inexpensive. Another way to prevent getting this page in the future is to use Privacy Pass. Your article have all the details and I appreciate you for this. […] Many plastics are found to possess excellent corrosion resistance. Properties of plastics vary depending on the chemical composition, arrangements and the processing method of its subunits. The name Plastic is derived from the Greek word plastikos, which means able to be shaped. Normally thermo-plastics have low melting point and cannot be used where temperature or heat condition persists. The plastics, prepared from phenolic resins, are only good in resisting weather effects. Notify me of follow-up comments by email. ASTM's plastics standards are instrumental in specifying, testing, and assessing the physical, mechanical, and chemical properties of a wide variety of materials and products that are made of plastic and its polymeric derivatives. Firstly, both the green and orange were very flexible, this … Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. The numbers, reflecting the 7 different types of plastic available in the market, are found on the 299 million tons of plastic that is produced annually to make water bottles, sports equipment, medical devices, DVD's and basically any other plastic you can think of. Plastics easily maintain its shape and do not go under plastic deformations. PVC • Polyvinyl chloride, commonly abbreviated PVC, is the third-most widely produced plastic, after polyethylene and polypropylene. I think this because of many reasons, these include the flexibility, hardness, density. 01 Crop Production and Management. Plastics may be amorphous solids, crystalline solids, or semicrystalline solids (crystallites) or any other form of solids. Following are the general properties of plastic. Your email address will not be published. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. For chemically resistant plastic, view our Chemical Resistance of Plastics chart. Also, you may want to use our Plastic Material Selection Guide or Interactive Thermoplastics Triangle to assist with the material selection process based on your application requirements. By observing whether a reaction takes place, chemical properties of some plastics can be identified. Geotechnical-Material Engineer. Performance & security by Cloudflare, Please complete the security check to access. (a)Polyster (b)Plastics (c)Both of these (d) None of these. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. (a)Thermoplastics (b)Thermosetting Thermoplastic varieties are found to be attacked by termites and rodents. FINENESS OF CEMENT BY BLAINES AIR PERMEABILITY METHOD (IS-4031-PART-2). Working Conditions. These solutions for Synthetic Fibres And Plastics are extremely popular among Class 8 students for Science Synthetic Fibres And Plastics Solutions come handy for quickly completing your homework and preparing for exams. Plastic shapes include sheet, rod, hex, pipe, cubes, balls, and tubes. Name a natural fibre. You may need to download version 2.0 now from the Chrome Web Store. Distribute materials and worksheets to students. • Plastics are available in variety of colors, both opaque and transparent. Plastics are also known as polymers. Properties of Materials. List and explain four properties of plastic give one use of plastic linked to each of these properties This question has not been answered yet! Save my name, email, and website in this browser for the next time I comment. 11. The lesson covers the complete explanation of class 8 Chapter 4 Metals and Non Metals.Topics covered are Introduction to metals, physical and chemical properties of metals. https://www.youtube.com/watch?v=Tnvd9OUPu3A, Being subjected to creep under constant load. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Answer: Cotton Question 2. Your IP: 45.62.196.10 Required fields are marked *, Notify me of follow-up comments via e-mail address. Prepared by :- MOHAMMAD SIDDIQ SALIM III SEM - II YR B-arch POORNIMA UNIVERSITY, jaipur 2. Metals and Non Metals Class 8 Science Chapter 4 as per NCERT Book used in CBSE and other Schools. Plastic materials consist of long chain molecules (polymers). 9._____ can be recycled, reused, melted and rolled into sheets. Each plastic material has its own peculiar properties to suit its particular uses. 5. 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