How to test plastic raw materials?
Contrast the appearance quality of raw materials, separately open 1~2 bags, take out a little plastic particles, contrast the size and color of the plastic particles in each bag. And compare the same batch of plastic particles with the previous batch. There were no obvious differences in the color and graininess of the raw material particles in different packaging bags and batches
Thermal stability test of size and appearance quality. Place the product in a 8020C oven, 24H, and cool down to 2350C (2H). Measure the size of the same measuring point before and after the test, and calculate the percentage change rate. And observe the appearance quality changes, dimensional change rate of <0.2%, appearance is not allowed to have deformation, crack, expansion, surface gray, discoloration and other phenomena.
Sample appearance quality. The plastic raw material is produced according to the normal production process, and the appearance quality of 10~20 parts is observed. The sample product shall not be cracked, deformed, foamed, broken, expanded or shrunk, and other defects that affect appearance. Smooth surface and clear surface.
