This set of polymer properties of repeating molecular structure units allowed plastic to be an important part of the twenty first century.
Plastics are organic liquids which dissolve in big qualities into solid polymers.
Chemical structure Thermosets assumed to have unaccounted of molecular weight.
But in fact its common range around 20,000 and 50,000 amu .
Nevertheless, the plastic technology was developed which let the plastics to be very useful and reliable as a material to design product.
The plastic characterized by its light-weight , the possibility to colored when manufacturing.
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Later on, in the second world war plastic like nylon and polyethylene used as replacement material for other materials in short time.
Because the early plastics were not complete chemically stable, it become popular as a unreliable and cheap material.