Packaging, housewares (tableware, trays, etc), electrical (transparent housings, light diffusers, insulating film).
Injection Molding Processing Conditions:
Drying¡GNot usually required unless stored improperly. If drying is needed, the recommended conditions are 2-3 hours at 80 ¢J.
Melt Temperature¡G180-280 ¢J (upper limit is 250 ¢J for flame retardant grades).
Mould Temperature¡G-7 - 70 ¢J (lower temperatures are typically used for thin wall components); Suggested: 40-50 ¢J.
Injection Pressure¡G20-60 MPa.
Injection Speed¡GFast speeds are recommended.
Runners and Gates¡G
All types of conventional gates may be used.
Chemical and Physical Properties
General-purpose PS is produced by the polymerisation of styrene. Most commercial grades are clear, amorphous polymers. PS offers excellent dimensional and thermal stability, optical clarity, and very little tendency to absorb moisture. It has good dielectric properties. It is resistant to water and dilute inorganic acids, but is attacked by strong oxidising acids such as concentrated sulphuric acid, and is swollen by some organic solvents.
Processing shrinkage is typically between 0.4-0.7%.