Glossary of terms

Injection moulding - Material is fed into a heated barrel, mixed, and forced into a mould cavity where it cools and hardens to the shape of the mould.

Blow molding - A process used to produce hollow objects from plastic. The blow molding process begins with melting down the plastic and forming it into a tube-like piece of plastic with a hole in one end in which compressed air can pass through. Pressurized air, is used to expand the hot tube and press it against a mold cavity. The pressure is held until the plastic cools.

Injection Stretch Moulding - The plastic is first molded into a "preform" using the injection molding process. These preforms are produced with the necks of the bottles, including threads on one end. These preforms are fed after cooling into a reheat stretch blow molding machine, reheated, and then blown using high pressure air into bottles using metal blow moulds.

PET (Polyethylene terephthalate), a plastic resin and a form of polyester. Commonly used to package soft drinks, cosmetics and household cleaners. Resistant to common solvents, but is attacked by strong alkali.

HDPE (Hydensity polyethylene) - Polymerised chains of ethylene. Typically used in containers for household cleaners.

PP (Polypropylene) - Typically used for container caps and can be used for containers themselves, typically where chemical resistance is required.