PLASTICS

PLASTICS

1. TYPES

   • Thermoplastics
     • Materials
       • Polyethylene (PE)
         • Most common type of plastic. Good chemical resistance. Nos-toxic. Food packaging, bags, bottles, pipes, containers...
       • Plolystyrene (PS)
         • Lightweight, transparent plastic. Packaging & heat instulation
       • PCV (polyvinyl chloride)
         • HIghly resistant to abrasion and impact. Pipes, cable insulation, profiles for doors & windows
       • Polypropylene (PP)
         • Easy to model and dye. Resistant to solvent & splintering. Toys, folders, packaging...
       • PET (polyethylene terephthalate)
         • Food use, recyclable, transparent & easy to dye. Bottles.
       • Teflon
         • Highly resistant to chemicals & high temperatures. Excellent non-stick properties.
       • Polycarbonate (PC)
         • Highly resistant to impact and heat. Optical transparency.
     • Definition
       • Plastics that're softened by heating & can be formed and melt as many times as we like. Polymers have weak bonds
   • Thermoset
     • Definition
       • The polymer chains of thermoset plastic criss-cross to form networks. The plastics can be shaped using heat. Once they've been formed you can't re-melted.
     • Materials
       • Melamine
         • Resistant to high temperatures & chemicals. Easy to clean.
       • Bakelite
         • Hard & brite, dark plastic. Resistant to heat, but breaks down at very high temperatures.
       • Polyester resins
         • Rigid, brittle. Strengthened with fibreglass.
   • Elastomers
     • Definition
       • Very flexible materials that recover their shape and dimensions when external forces stop acting on them. Degrade easily with the heat and cannot be re-melted once they've been formed
     • Materials
       • Ruber
         • Natura or synthetic. Very elastic. Tyres, hoses, rubber bands...
       • Neoprene
         • Flexible, insulated & waterproof. Immersion suits.
       • Silicone
         • Colorless, oils or rubber-like substances.

2. materials formed by chains of carbon and hydrogen atoms (chains polymers), the atoms that form them are monomers.

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