HDPE
High-Density Polyethylene – This is a petroleum-based thermoplastic with a large strength to density ratio.

LDPE
Low-Density Polyethylene – A petroleum-based thermoplastic commonly used in plastic bags.  It is flexible and tough.

Styrene
Also known as vinyl benzene, this is used to produce polystyrene products.

High impact polystyrene
A low-cost, tough plastic which is easily formed and printed on.

ABS
Acrylonitrile butadiene styrene – A copolymer slightly stronger than polystyrene used for drainage/venting pipes and automotive trim.

Polycarbonate
Polycarbonates are easily thermoformed, and the end product is durable and scratch- and impact-resistant.

Single sheet
Thermoforming using one sheet of heated plastic.

Twin sheet
Thermoforming using two sheets of heated plastic to create seamless bonds and high-strength plastic goods.

CNC trimming
Computer Numerical Control – Peninsula Plastics uses a CNC router for accurate and recurring trimming of thermoformed plastics.

HMWPE
High Molecular Weight Polyethylene – A thermoplastic with the highest impact strength of any other.  It is highly corrosion-resistant and has low moisture absorption.
 
TPO
Thermoplastic PolyOlefin – A trademarked combination of polypropylene, polyethylene and rubber used extensively in the auto industry.  It does not degrade under UV radiation.
 
EVA
Ethylene-vinyl acetate – A copolymer of ethylene and vinyl acetate which produces a soft and flexible product.
 
Cross link forms
Bonds that link one polymer chain to another.  Depending on the cross-link density, polymers will have differing strengths.

Plastic corrugated sheet
These are used for replaceable packaging material as well as for graphic printing.