Causes of brittle silicone rubber products

In the production process, it will be found that silicone rubber products are brittle and easy to break, which seriously affects the production, and the service life of brittle silicone rubber products can not meet the requirements. So, what are the reasons for the brittleness of silicone rubber products?

1、 The structure or mold design of silicone rubber products leads to the product easy to crack.

The product structure or mold design is unreasonable, resulting in easy fragmentation of silicone rubber products during molding,

Solution: modify the structure of the product or mold to achieve improvement, for example: slightly thicken the too thin place, slightly fillet the right angle, etc.

2、 Too high molding temperature or too long vulcanization time lead to brittle silicone rubber products.

Solution: reduce the temperature and control the curing time.

3、 Poor ventilation of secondary sulfur addition or too high temperature cause the brittleness of silicone rubber products.

Solution: pay attention to adjust the ventilation and control temperature of secondary sulfur addition,

4、 Silicone rubber itself is a raw material.

The main reason for the brittleness of silicone rubber products is the rubber itself. Generally, the brittleness of silicone rubber products is due to the poor quality of the rubber itself, and the tear strength can not meet the requirements. In addition, many silicone rubber products manufacturers now fill the rubber with silica powder to reduce the cost in order to reduce the cost, which leads to the brittleness of the rubber that can not meet the requirements.

Solution: use pure rubber without silicon powder for production. For those with slightly higher requirements, use big brands of rubber such as Toshiba, Xinyue and Dow Corning for production. Special products may also be produced with high tensile adhesive (weather adhesive) to meet the tear strength requirements.

Summary:

Silicone rubber products are famous for their superior elasticity and super high tear strength. Products made of silicone rubber have long service life, comfortable hand feel and flexible texture, which are unmatched by products made of other materials. Among the above four reasons for the brittleness of silicone rubber products, the rubber itself is the most likely to be brittle, while other factors also exist, but the degree of influence is less. Therefore, when it is found that silicone rubber products are brittle in the production process, the high molding temperature should be eliminated first, and then start from the reason of the rubber itself.