Characteristics of injection molding material PP plastic

(Polypropylene)

Specific gravity: 0.9-0.91 g/cm3
Mold shrinkage: 1.0-2.5%
Molding temperature: 160-220℃

Material performance

Low density, strength and rigidity, hardness and heat resistance are better than low-pressure polyethylene, and can be used at about 100 degrees. It has good electrical properties and high-frequency insulation. It is not affected by humidity, but it becomes brittle at low temperatures, and is not resistant to molds and easy to aging. .

Suitable for making general mechanical parts, corrosion-resistant parts and insulating parts

Forming performance

1.Crystalline material has low hygroscopicity, is prone to melt fracture, and is easy to decompose in long-term contact with hot metal.

2. Good fluidity, but the shrinkage range and shrinkage value are large, and shrinkage holes, dents, and deformation are easy to occur.

3. The cooling speed is fast, the pouring system and the cooling system should slowly dissipate heat, and pay attention to control the molding temperature. The direction of the material temperature is obvious. The direction is obvious. It is especially obvious at low temperature and high pressure. When the mold temperature is lower than 50 degrees, the plastic parts are not smooth and easy to produce Poor welding, leaving marks, warping and deformation above 90 degrees

4. The plastic wall thickness must be uniform to avoid lack of glue and sharp corners to prevent stress concentration.