PA12 Polyamide 12 or Nylon 12 Typical applications: water gauges and other commercial equipment, cable jackets, mechanical cams, sliding mechanisms and bearings.
Injection molding process conditions: drying treatment: the humidity should be below 0.1% before processing. If the material is stored in the air, it is recommended to dry in 85C hot air for 4 to 5 hours. If the material is stored in a closed container, it can be used directly after 3 hours of temperature equilibration.
Chemical and physical properties: PA12 is a linear, semi-crystalline-crystalline thermoplastic from butadiene. Its characteristics are similar to those of PA11, but the crystal structure is different. PA12 is a good electrical insulator and, like other polyamides, does not affect insulation properties due to moisture. It has good impact resistance and chemical stability. PA12 has many improved varieties in terms of plasticizing properties and reinforcing properties. Compared to PA6 and PA66, these materials have a lower melting point and density and have a very high moisture regain. PA12 is not resistant to strong oxidizing acids. The viscosity of PA12 is mainly determined by humidity, temperature and storage time. It is very fluid. The shrinkage is between 0.5% and 2%, depending on the material variety, wall thickness and other process conditions.
PS Polystyrene Typical applications: product packaging, household goods, tableware, trays, etc., electrical (transparent containers, light source diffusers, insulating films, etc.).
Injection Molding Process Conditions: Drying: Drying is usually not required unless stored improperly. If drying is required, it is recommended to dry at 80C for 2-3 hours. Melting temperature: 180~280C. The upper limit for the flame retardant material is 250C. Mold temperature: 40~50C. Injection pressure: 200~600bar. Injection speed: A fast injection speed is recommended. Runners and gates: All conventional types of gates can be used.
Chemical and physical properties: Most commercial PSs are transparent, amorphous materials. PS has very good geometric stability, thermal stability, optical transmission characteristics, electrical insulation properties and a very small tendency to absorb moisture. It is resistant to water, diluted inorganic acids, but can be corroded by strong oxidizing acids such as concentrated sulfuric acid and can swell and deform in some organic solvents. Typical shrinkage is between 0.4 and 0.7%.
SA styrene-acrylonitrile copolymer Typical application range: electrical sockets, housings, etc., household goods kitchen appliances, refrigerators, TV sets, etc., automotive industry (headlights, dashboards, etc.), household items (tableware, Food knives, etc.), cosmetics packaging, etc.
Injection Molding Process Conditions: Drying: SA has some hygroscopic properties if not properly stored. The recommended drying conditions are 80C for 2 to 4 hours. Melting temperature: 200~270C. If a thick walled product is processed, a melting temperature below the lower limit can be used. Mold temperature: 40~80C. For reinforced materials, the mold temperature should not exceed 60C. The cooling system must be well designed because the mold temperature will directly affect the appearance, shrinkage and bending of the article. Injection pressure: 350~1300bar. Injection speed: High speed injection is recommended. Runners and gates: All regular gates can be used. The gate size must be appropriate to avoid streaks, freckles and voids.
Chemical and physical properties: SA is a hard, transparent material. The styrene component makes SA hard, transparent and easy to process; the acrylonitrile component gives SA chemical and thermal stability. SA has a strong load carrying capacity, chemical resistance, thermal deformation resistance and geometric stability. The addition of glass fiber additives to SA can increase the strength and resistance to thermal deformation and reduce the coefficient of thermal expansion. The Vicat softening temperature of SA is about 110C. The deflection temperature under load is about 100C. The shrinkage rate of SA is about 0.3 to 0.7%.
