Chemical Name: Polypropylene

English name: Polypropylene (referred to as PP)

Gravity: 0.9-0.91 g / cc molding shrinkage: 1.0-2.5% molding temperature: 160-220 ℃.

Features: density, strength stiffness, hardness and heat resistance are superior to low-pressure polyethylene, can be used at 100 degrees has good electrical properties and high-frequency insulation from humidity, but the low temperature brittle, do not wear. easy to aging. suitable for production of general machinery parts, corrosion-resistant parts and insulating parts.

Molding characteristics:

1. crystalline material, moisture absorption, prone to melt fracture, long-term contact with the hot metal decomposition.

2. Liquidity is good, but the scope and shrinkage shrink large, prone to shrinkage. Dents, deformation.

3. Cooling speed, gating system and cooling system should be slow to heat, and pay attention to controlling the molding temperature.