Why do transparent silicone products turn yellow?

During the production of silicone products, manufacturers may notice that originally colorless and transparent silicone items develop discoloration. Silicone itself possesses high-temperature resistance and anti-aging properties, so under normal conditions, finished silicone products should not yellow for several years. What, then, causes this discoloration?

Firstly, the choice of vulcanizing agent plays a significant role. Ordinary non-yellowing-resistant vulcanizing agents affect light or transparent colors differently, often leading to noticeable yellowing in such products.

Secondly, the production process also impacts the color. Excessively high machine temperatures or prolonged vulcanization times during molding can cause the finished products to yellow. Thus, controlling molding temperature and vulcanization duration is essential to prevent yellowing.

Lastly, the quality of raw materials is critical. If anti-yellowing vulcanizing agents are used but the products still yellow, the raw materials may lack anti-yellowing properties. In such cases, changing the raw materials may be necessary.

In summary, the yellowing of transparent silicone products is primarily due to the choice of vulcanizing agents, production process control, and raw material quality. Optimizing these factors can effectively reduce yellowing, extending the product's lifespan and maintaining its appearance.

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