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Types Of Plastic Materials And Their Properties Pdf

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The Properties of Plastics

Plastic , polymeric material that has the capability of being molded or shaped, usually by the application of heat and pressure. 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. These include tough and lightweight beverage bottles made of polyethylene terephthalate PET , flexible garden hoses made of polyvinyl chloride PVC , insulating food containers made of foamed polystyrene , and shatterproof windows made of polymethyl methacrylate. In this article a brief review of the essential properties of plastics is provided, followed by a more detailed description of their processing into useful products and subsequent recycling. For a fuller understanding of the materials from which plastics are made, see chemistry of industrial polymers. Many of the chemical names of the polymers employed as plastics have become familiar to consumers, although some are better known by their abbreviations or trade names. Thus, polyethylene terephthalate and polyvinyl chloride are commonly referred to as PET and PVC, while foamed polystyrene and polymethyl methacrylate are known by their trademarked names, Styrofoam and Plexiglas or Perspex.

Different Types of Plastic, Their Applications & Recycle Codes

Since the s, the production of plastic has outpaced that of almost every other material. Plastic is an essential component of many items, including water bottles, combs, and beverage containers. Television, computer, car, house, refrigerator, and many other essential products utilize plastic materials to make our life easier and more straightforward. In , the Society of the Plastics Industry SPI established a classification system to help people properly recycle and dispose of their plastics. Today, manufacturers follow this coding system and place a number, or SPI code, on each product, usually molded into the bottom.

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Plastic Properties Table

Year 10 Manufacturing Resistant Materials. Lesson 4 Plastics. Properties, Uses and Common Forms. Lesson10 Vacuum forming.

Plastic.pdf

The world is full of plastics. Whether you realize it or not, practically everything you see and use on a daily basis is entirely or partly plastic material.

Sort, compare, and find the plastic material suited for your application

According to their characteristics, there are three types of classifications regarding plastics according to: their chemical structure, their polarity and their applications. According to their chemical structure and temperature behaviour , plastics can be divided into:. With regard to polarity , the presence of atoms of a different nature causes electrons to move towards the most electronegative atom in covalent bonds, thus resulting in a dipole. If the polarity is increased, the mechanical resistance, hardness, rigidity, heat resistance, water and moisture absorption and chemical resistance, as well as permeability to polar compounds such as water vapour and adhesivity and adherence to metals is also increased. At the same time, the increase in polarity reduces the thermal expansion, the electrical insulation capacity, the tendency to accumulate electrostatic charges and the permeability to polar molecules O2, N2. In this way, it is possible to distinguish between different families such as polyolefins, polyesters, acetals, halogenated polymers and others. The third and last classification, according to their application , is applied to thermoplastic materials.

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According to their characteristics, there are three types of classifications regarding plastics according to: their chemical structure, their polarity and their applications. According to their chemical structure and temperature behaviour , plastics can be divided into:. With regard to polarity , the presence of atoms of a different nature causes electrons to move towards the most electronegative atom in covalent bonds, thus resulting in a dipole. If the polarity is increased, the mechanical resistance, hardness, rigidity, heat resistance, water and moisture absorption and chemical resistance, as well as permeability to polar compounds such as water vapour and adhesivity and adherence to metals is also increased. At the same time, the increase in polarity reduces the thermal expansion, the electrical insulation capacity, the tendency to accumulate electrostatic charges and the permeability to polar molecules O2, N2.

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Почему вы не позвонили мне раньше. - Честно говоря, - нахмурился Стратмор, - я вообще не собирался этого делать. Мне не хотелось никого в это впутывать.

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