Why Does Room Temperature Vulcanized Silicone Rubber Become Brittle?

Silicone rubber is a new type of organic silicon elastomer used to manufacture one-component, two-component sealing adhesives, such as alcohol-free, acetone-free, and ketoxime-free, among others. It has excellent demolding properties, making it particularly suitable for making precision molds. It can also be used in electronic encapsulation adhesives as an insulating material.

It is widely used as a sealing and mold-making material, such as silicone for sealing windows. Various electronic and electrical components are coated with room temperature vulcanized silicone rubber and are widely used in the automotive and machinery industries for sealing, shockproof materials, textile, plastic, printing industries for rubber rollers, and the construction industry for joint sealing materials. It can also be used to make soft molds for casting epoxy resins, polyester resins, polystyrene, polyurethane, ethylene-based plastics, paraffin, low-melting alloys, and others. Additionally, using the high simulated properties of two-component room-temperature vulcanizing silicone rubber, it can replicate various exquisite patterns on cultural relics.

Manufacturers of room temperature vulcanizing rubber sometimes produce products that become brittle and easily breakable, seriously affecting our production efficiency. Even if these products can barely pass inspections, their service life in the market cannot meet reasonable time requirements. How can silicone product supplier control and prevent this phenomenon during production?

Problems with production of room temperature vulcanized silicone rubber

Temperature and time

High temperature and long processing time of silicone rubber during molding can cause the product to become brittle, while long ventilation time during secondary vulcanization can lead to the same issue.

Issues with room temperature vulcanized silicone rubber material

The main reasons for brittle or hard products made from silicone rubber material are substandard tear strength caused by poor material quality. It is recommended to use high-quality room temperature vulcanized silicone rubber material for production, and to use meteorological glue for the production of special products to achieve the required tear strength.

Design of high-temperature resistant mold materials and product structures for room temperature vulcanized silicone rubber

Unreasonable product structure or mold design for high-temperature resistant silicone rubber materials can lead to mold cracking during production. It is recommended to improve mold processing or mold structure, such as thickening overly thin areas or rounding slightly sharp corners.

High-temperature resistant silicone rubber products are renowned for their super-strong high tear strength properties and superior elasticity, resulting in soft and flexible product texture, multiple molding times, and comfortable touch, making them unmatched by products made from other materials. The production of high-temperature resistant silicone rubber products is a complex process, and the key to identifying and solving major product quality problems is mid-process inspection.


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