Resin Code Reference





1 (PET)

Polyethylene Terephthalate (PET, PETE, APET, RPET)


PET is clear, tough, and has good gas and moisture barrier properties. This resin is commonly used in beverage bottles and consumer product containers.


Cleaned, recycled PET flakes and pellets are used for spinning fiber for carpet yarns, producing fiberfill, and geo-textiles.

·         Clear and optically smooth surfaces.

·         Excellent barrier to oxygen, water, and carbon dioxide.

·         High impact capability and shatter resistance.

·         Excellent resistance to most solvents.

·         Capability for hot-filling.

2 (HDPE)

High Density Polyethylene (HDPE)


HDPE packaging generally is translucent, has good barrier properties and stiffness, and is well suited to products with a short shelf life such as milk.


Because HDPE has good chemical resistance, it is used for packaging many household and industrial chemicals such as detergents.

·         Excellent resistance to most solvents.

·         Higher tensile strength compared to other forms of polyethylene.

·         Relatively stiff material with useful temperature capabilities.

3 (PVC)

PVC (Polyvinyl Chloride)


4 (LDPE)

Low Density Polyethylene (LDPE)


Used predominately in film applications due to its flexibility.


5 (PP)

Polypropylene (PP)


PP has good chemical resistance, is strong, and has a high melting point making it good for hot-fill liquids.

·         Good optical clarity.

·         Low moisture vapor transmission.

·         Inertness toward acids, alkalis and most solvents.

6 (PS)

Polystyrene (PS)


PS is a versatile plastic that can be rigid or foamed. General purpose polystyrene is clear, hard, and brittle. It has a relatively low melting point. Typical applications include protective packaging, foodservice packaging, bottles, and food containers.


PS is often combined with rubber to make high impact polystyrene (HIPS) which is used for packaging and durable applications requiring toughness, but not clarity.

·         Excellent moisture barrier for short shelf life products.

·         Significant stiffness in rigid forms.

7 (Other, PLA)



Use of this code indicates that a package is made with a resin other than the six listed above, or is made of more than one resin and used in a multi-layer combination.



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