extrusion hose surface why there are small black particles. Some silicone manufacturers have consulted us about this problem, so let's briefly discuss what causes this problem. Because there are many reasons, it depends on the composition of the formula and the vulcanization process.

1. First, analyze whether the particles are soft or hard. Then sun the carbon black to see if there are any hard carbon particles. Make the raw rubber too thin to see if there is any gel phenomenon.

2, there are impurities and the quality of auxiliary materials is unstable;

3, the glue mixing machine is not cleaned up, the glue is ripe and hard inside, and may appear on the glue the next day;

4, some fillers such as zinc oxide, kaolin, white carbon black are poorly dispersed;

5, gels, including gels caused by the scorching of the carbon black or the raw rubber itself.