PVC: density 1. 38, processing temperature 180- 180 degrees,30-50 mold temperature, shrinkage ratio 0.5, vicat softening point 70 degrees. Advantages: good size stabilitylow cost, good corrosion resistance, and different
proportion of plasticizer, easy to adjust the hardness Disadvantages: resistance to temperature tolerance. The thermal decomposition produces hydrogen chloride.
PET: density 1. 37, processing temperature of 260- 290, mold temperature 140, contraction rate 1.2 -2.0, melting point245-260 degrees. Advantages: good dimensional stability,excell ent mechanical properties, good electrical .
characteristics, good weather resistance, organic solvent,oil and weak acid. Good air resistance and good waterresistance. It' s self- -extingui shing. Disadvantages:
mechanical properties have direction, high fluidity, slowcrystallization speed, strict drying and process ingconditions.
ABS: density 1.06, processing temperature of 210- -275, moldtemperature 50-90, systolic 0.4-0. 7, melting point 175degrees, general ratio A: C = 20:30: 50. Advantages: hard,easy to press, easy to stain, hard to burn, resistant to
impact, with A good appearance. Disadvantages: poor solventresistance, low dielectric strength, low tensile strength. .