A paragraph on plastic
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Answer:
A plastic is a material that can change its shape. Many things are made of plastics, usually because making them the right shape is easy. There are many types of plastic. Some can be shaped only when they are freshly made; then they become hard. Others are thermoplastic and can be softened by heating them. These plastics can be used for 3D printing, because the plastic will become soft enough to form into different shapes, and then become hard again when they cool down.
Most of the materials that are called plastic are polymers. ... Old plastics are usually thrown away and put in landfills. Some plastics release toxic fumes when heated. Some plastics are recycled so they won't become waste.
Here are the seven standard classifications for plastics, and the recycling and reuse information for each type.
#1 - PET (Polyethylene Terephthalate) ...
#2 - HDPE (High-Density Polyethylene) ...
#3 – PVC (Polyvinyl Chloride) ...
#4 – LDPE (Low-Density Polyethylene) ...
#5 – PP (Polypropylene) ...
#6 – PS (Polystyrene)
#7 - Other (BPA, Polycarbonate and LEXAN)