What's up with the yellowed nNeoprene Zipper Cable Sleeve?

The Neoprene Zipper Cable Sleeve will turn yellow at high temperature. The problem is that the transparent Neoprene Zipper Cable Sleeve that food needs to contact will turn yellow after 4 hours at a high temperature of 200°C. How is this? thing.

Use high anti-yellow vulcanizing agent C-15 for cable bushing, maybe this problem will be solved. Generally, food-grade products have this requirement. To prevent yellowing after secondary sulfur addition, anti-yellow catalyst + anti-yellow agent must be used. Both are indispensable, but these two things will make it a bit sticky during oil pressure production. Things to pay attention to, add 2-3 per thousand of hydrogen-containing silicone oil according to the amount of Cable Sleeve, high hydrogen-containing silicone oil can solve the problem of yellowing, but the product may be a little brittle and sticky to the mold, you can spray a layer of silicone oil on the mold to solve it The demoulding problem, other than that, the only way to bridge it is to use platinum.
It is of course a good idea for the Neoprene Zipper Cable Sleeve manufacturer to analyze the anti-yellowing agent and anti-yellowing vulcanizing agent for you. But you also need to pay attention to whether the Neoprene Zipper Cable Sleeve you use is ideal, and you can't add too much internal mold release agent, zinc stearate. Therefore, it is necessary to communicate with the supplier whether there is already hydrogen-containing silicone oil in it to provide anti-yellowing effect. The powder is very important. If the iron content in it is too high, it will definitely turn yellow.
But you can also experiment, compare the common vulcanizing agent with the anti-yellowing agent, and be careful not to add zinc stearate internal mold release agent. If it still doesn't work, it is recommended that you change to other rubber or use platinum vulcanizing agent. If there is sulfur or sulfur carriers in the environment (such as sulfur-vulcanized products that have just been baked in the oven), it will also cause yellowing of Neoprene Zipper Cable Sleeve.