During the production process of silicone rubber products, it is common to encounter "poor vulcanization" of the products. In simpler terms, we call this "undercooked". This is a very serious defect for silicone rubber products. If it reaches the customers, the consequences would be unimaginable. So, what are the factors that cause poor vulcanization of the products? Today, let's elaborate on this in detail for everyone.
First: The ratio of the vulcanizing agent is incorrect. As everyone knows, the raw materials we purchase are natural rubber and we also need to add vulcanizing agents, color mother powder, etc. All of these have strict requirements based on the material formula. They need to be precisely measured and weighed before being added in the required proportion according to the formula. If the ratio is incorrect, it will affect the material properties and lead to poor product vulcanization.
Second: The distribution of the vulcanizing agent is uneven during the mixing process. If the vulcanizing agent is added during mixing and the distribution is overly concentrated in certain areas or overly dispersed, it will also lead to poor subsequent vulcanization.
Third: Excessive or insufficient vulcanization temperature. During the molding process, the surface temperature of the mold should be set according to the different characteristics of the material, and the temperature of the mold should be evenly distributed without any local areas with excessively high or low temperatures. Generally, the maximum temperature difference between the upper and lower molds should not exceed 5 degrees Celsius.
Fourth: Insufficient vulcanization time. Each material has a specific vulcanization time that must be met for complete vulcanization. The vulcanization time may vary depending on the material formula. Some manufacturers may reduce the vulcanization time during molding in an attempt to increase production capacity. However, the appearance of the product may not show any problems at first, but in fact, the product has not been fully vulcanized and has not reached the actual performance of the material. Such products will have relatively poor physical properties, such as the product's aging resistance and tear resistance.
Understanding the causes of "poor vulcanization" will enable you to take appropriate measures. Yongyong Silicone Rubber has been dedicated to silicone rubber products for 23 years, ensuring quality and providing you with a one-stop service including quality consultation and testing. Contact number: 0769-85536776.
