Classification of plastics Physical Properties of Plastic Processing
Plastic classification tree


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Classification of plastics
Plastics, depending on their physical properties, may be classified as thermoplastic and thermosetting materials. They are classified by their heat resistance, Crystalline/amorphous, molecular chain, and whether if it’s natural or artificial.

Plastic

  1. Thermoplastics
    • A.Non-crystalline plastics: PS, SAN(AS), ABS, PC, PMMA, PVC
    • B.Crystalline plastics: PE, PP, PA, POM, PTFE, PETP etc.
  2. Thermosetting plastics: PF, UF, MF, UP, SO, EP etc.

THERMOPLASTICS

Thermoplastic plastics are also known as thermo-softening plastic. Their molecular chains are not cross-linked therefore demonstrates plastic elastic behavior and are thermo-formable. It also melts when heated and solidifies when cooled.

THERMOSETTING PLASTICS

Thermoset materials are usually liquid or malleable prior to curing and designed to be molded into their final form. They can no longer be shaped after hardening. They also cannot be melted. However, they do offer good chemical resistance and a high level of thermal stability, as well as being hard and brittle.

AMORPHOUS PLASTICS

No regular pattern in particles

CRYSTALLINE PLASTICS

Polymer chain partly in crystalline lamella and partly in amorphous state

A crystal structure describes a highly ordered structure, occurring due to the intrinsic nature of molecules to symmetric patterns. Plastics usually have a crystalline structure, even PVC (has low rigid structure) contains 20% crystalline lamella.
(Quick fact: Natural rubber contains none crystalline structure. On the other hand, materials such as fiber contains higher crystalline structure than plastic, nylon contains up to 70%, fiber contains 90%)
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Categories
ITEM RECYCLED FROM
PE LDPE Shopping bag…
LLDPE Stretch film…
HDPE Container, milk jar…
PP GPP Jumbo bag, file, case…
HIPP Auto bumper…
PS EPS Poly form case…
GPS CD case, drinking cup, cup lid…
HIPS Appliance, TV…
PVC soft Tube, cable, agriculture film…
rigid Pipe…
PET APET Sheet…
PET-G Film…
PET Bottles…
ABS   Pachinko set, appliance…
PA PA6 Parts…
PA66 Liner, fiber…
PC   Bottles, CD, lenses…
PMMA   Advertising sign…
TPO Auto parts, trim…
EVA Expanded pad…
TPU ether Tube, cloth…
ester Parts…
Resin identifyication code
Polyethylene terephthalate
High-density polyethylene
Polyvinyl chloride
Low-density polyethylene
Polypropylene
Polystyrene
Other plastics,such as acrylic, nylon,polycarbonate,and polylactic acid (abioplastic), and multilayer combinations of different plastics