Silicone products turn yellow after a long time, turn yellow when made into silicone molds, which is a headache for the silicone industry. Let's briefly analyze the reasons with you.

       1. Added vulcanizing agent. The properties of the vulcanizing agent are divided into ordinary type yellow resistance. The ordinary non-yellowing vulcanizing agent is used in some non-exposed silicone products that can be used for darker colors low color requirements. Even if the silicone turns yellow, it will have a major impact. The anti-yellowing vulcanizing agent is applied to the products that need to be exposed, the color is lighter brighter, the color requirements are higher, the anti-yellowing vulcanizing agent is added to ensure the color of the silicone product to a great extent. However, it does rule out that the poor quality of the vulcanizing agent itself will make the liquid silica gel appear light yellow in the production molding. In such a situation, it is necessary to choose whether to replace the silica gel raw material according to the product requirements.

      2. Process. When transparent silicone products are molded, different variable conditions are also the main reasons that cause the color of transparent silicone products to turn yellow after molding. For example, the mold temperature is too high, the vulcanization time is too long, after the second vulcanization, etc.

       Although silicone products have excellent weather resistance aging resistance. However, sometimes the silicone products that have just been released are yellowish. In order to avoid this situation, the vulcanizing agent should be selected according to the requirements, the temperature of the mold the vulcanization time of the product should be strictly controlled in the process, the yellowing resistance of the raw materials is the key.