Identifying Plastic Material:
- Utilizing unique behaviors and properties such as density can help determine which type of plastic is being dealt with. Some plastics (PP, PS, PETE) are labelled with a numerical marker on the surface for recycling purposes. Below are two good charts describing this:
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Identifying Plastic Manufacturing Method:
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Common methods consist of Plastic Extrusion, Compression Molding, Thermoforming, Injection Molding, and Blow Molding
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Plastic Extrusion: Typically for thermoplastic parts that are continuous in a certain dimension such as pipes and sheets (read more)
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Compression Molding: Uses thermosetting plastics for designs with simpler geometries (read more)
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Thermoforming: Uses thermoplastics to make larger geometries (read more)
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Injection Molding: Uses thermoplastics with more complex geometries (read more)
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Blow Molding: Typically for hollow, thermoplastic parts with thin walls (read more)