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Plastic Container Terms

Blow Mold – To make hollow objects by extruding plastic into a chamber that is blown outward to take the shape of the mold cavity.
 
British Thermal Unit (BTU) – The amount of heat necessary to heat one pound of water one degree Fahrenheit.
 
Coextrusion – A process in which items are blow-molded with walls containing two or more layers of different materials. This process uses recycled material often.
 
Extrusion – The most common of the plastics processing techniques, covering a vast range of applications in which resins are melted, heated and pumped for processing.
(http://www.extrudedplastics.com)
 
HazMat – Hazardous materials. The Environmental Protection Agency has standards for plastics regarding the ability to handle various HazMat substances.
 
High Density Polyethylene (HDPE) Colored (Pigmented) – Often used for bleach, liquid detergents, motor oil and other household and automotive products. Commonly bears the number "2" in the recycling triangle symbol on the bottom of the container.
 
High Density Polyethylene (HDPE) Natural (Non-pigmented) – Commonly used for dairy products, juice and other household products. Usually bears the number "2" in the recycling triangle at the bottom of the container.
 
High Density Polyethylene (HDPE) Wide – Natural and pigmented, often used for butter and other food product tubs, some medicine bottles and 5-gallon buckets. Usually displays the number "2" in the recycling triangle symbol at the bottom of the container.
 
Injection Mold – Under pressure, heated plastic granules are “injected” into a mold, where the molten plastic hardens into the designated shape.
 
In-line Fluorinated – A term that describes the chemical modification of the interior of HDPE containers caused by fluorine gas as they are blown. This chemical reaction forms an inner barrier that withstands solvent-based chemicals, making the containers suitable for the packaging of janitorial, industrial and consumer products.

ISO Container – Intermodal containers used to transport freight and designed for transportation by more than just one mode like ship and rail. Sizes vary but typical sizes are 20 feet and 40 feet; the standard width of ISO containers is 8 feet, and the standard heights for ISO containers are 8 feet 6 inches and 9 feet 6 inches.

Low Density Polyethylene (LDPE) – Used for shrink-wrap, plastic bags, garment bags, dry cleaning bags and squeezable food bottles.

Monomer – A comparatively simple compound that can react to form a polymer. The basic element in plastics.
 
Polyethylene Teraphtalate (PET) Slim – Color and clear, used to contain cosmetics, water, salad dressings and cleaners. Usually bears number "1" in the recycling triangle at the bottom of container.
 
Polymer – A compound, natural or synthetic, whose structure can be represented by a repeated small unit. Synthetic polymers are formed by condensation polymerization of monomers; some polymers are rubber, some plastics.

Polypropylene (PP) – Used for margarine and yogurt containers, caps for containers, wrapping to replace cellophane and medicine bottles.

Polystyrene (PS) – Used for egg cartons, fast food trays, disposable plastic silverware, cups and compact disc jackets.

Polyvinyl Chloride (PVC) – Used for food wrap, vegetable oil bottles and blister packaging.

Recycling – The cycle of actions by which discarded materials are collected, sorted, processed and transformed back into raw materials and then used in the production of new products.
 
Resin – Most resins are polymers, a class of solid or semi-solid organic products of natural or synthetic origin, of high molecular weight with no definite melting point.

Rigid Plastic Container – Any formed or molded plastic container that retains its shape when full or empty. This classification does not include bottles.
 
Rotational Molding – Hollow molds filled with powdered resin that swings the entire mold into a furnace that melts the powder, making it stick to the mold as it cools. The mold slowly rotates and water is used to cool the mold while the plastic hardens into a hollow part. (http://www.rotationallymoldedplastics.com)  

Tare Weight – Weight of the container when empty.
 
Thermoforming – A process of heating a thermoplastic sheet to an effective temperature and then forming it into a completed shape by means of heat or force.