From Wikipedia, the free encyclopedia

Plastic is the general common term for a wide range of synthetic or semisynthetic organic amorphous solid materials suitable for the manufacture of industrial products. Plastics are typically polymers of high molecular mass, and may contain other substances to improve performance and/or reduce costs.

The word derives from the Greek πλαστικός (plastikos) meaning fit for molding, and πλαστός (plastos) meaning molded.[1][2] It refers to their malleability, or plasticity during manufacture, that allows them to be cast, pressed, or extruded into an enormous variety of shapes—such as films, fibers, plates, tubes, bottles, boxes, and much more.

The common word plastic should not be confused with the technical adjective plastic, which is applied to any material which undergoes a permanent change of shape (plastic deformation) when strained beyond a certain point. Aluminum, for instance, is plastic in this sense, but not a plastic in the common sense; in contrast, in their finished forms, some plastics will break before deforming and therefore are not plastic in the technical sense.

There are two types of plastics: thermoplastics and thermosets. Thermoplastics will soften and melt if enough heat is applied; examples are polyethylene, polystyrene, and polytetrafluoroethylene (PTFE). Thermosets do not soften or melt no matter how much heat is applied.


[发布人:HT]    [发布时间:9/25/2009]    [点击次数:2434]    
Add:4/F West Block, No.15 Zhongyuan Road, Luogang Industrial Zone, Buji Town,Shenzhen City,China.
Tel:86-755-28882472 Fax:86-755-84179739
E-mail:ht-inquiries@plastic-products.biz M S N:jeffreychen9932@hotmail.com