1. First of all, distinguish from the color:
The color of the new material is bright, and the cutting material is uniform and beautiful；
The color of the old material is dull, the grain type is uneven and unsightly;
New material, less impurities, very low or no moisture content;
Old materials have relatively many impurities and generally trace moisture.
2. New material products, good mechanical properties such as tensile strength, good anti-aging performance;
The mechanical properties of old finished materials such as tensile are poor, and the chemical properties such as anti-aging are degraded.
New material: resin melting index range of 0.25-2.0) g/10 minutes, density of 0.918 to 0.932 g/cm³.
