Specific Gravity

Specific-Gravity

Specific Gravity of Various Plastics

SPECIFIC GRAVITY- The ratio of the weight of the molded piece as compared to the weight of an equal volume of water ASTM D792.


Polybutylene 0.60

Polymethylpentene 0.83

Ethylene-propylene 0.86

Polypropylene 0.90-0.92

Polyethylene

LDPE 0.91-0.93

LLDPE 0.91-0.94

HDPE 0.96-0.97

Polybutene 0.91-0.92

Natural rubber 0.91

Butyl rubber 0.92

Styrene-butadiene 0.93

Polyamide

PA-12 1.02 PA-11 1.04 PA-6 1.12-1.13 PA-66 1.13-1.15

ABS 1.04-1.07

Polystyrene 1.05

Polyacronitrile 1.17

Polyvinyl acetate 1.19

Polycarbonate 1.2

Polychloroprene rubber 1.23

Polysulphone 1.24

Polyethylene terephtalate 1.34-1.39

PVC 1.37-1.39

POM 1.41-1.43

Polytetrafluorethylene 2.27

Soon to follow:Simple examples of how to convert volume of your part from cubic cm or cubic inches to ounces and pounds per thousand parts.

Need to get back to my job for now. bye- you are leaving Specific-gravity, hope you visit injection mold tips again

Mini-Scrapers

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New Mini-Scrapers available from Yankee Mold.

Made of Acetal plastic.

In handle small sizes that you can't find elsewhere.

MS-1 Mini-Scraper with a straight blade and a pointy end.

MS-2 Mini-Scraper with an angled blade and a 1/8" flat end.

All Mini-Scrapers are available in 3 different materials:

Red for Unfilled Acetal (most flexible)

Blue for 12% Glass Filled Acetal (medium stiffness)

White for 25% Glass Filled Acetal (maximum stiffness)


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Try our introductory pack