The essence of ceramicized silicone rubber is a special composite material made by carefully blending methyl vinyl silicone rubber as the matrix, supplemented with ceramic fillers such as muscovite, wollastonite, and kaolin, and then adding low melting point glass powder as a flux. The bending strength of the sintered ceramic body far exceeds that of ordinary silicone rubber, and increases with temperature, demonstrating excellent thermal shock resistance.

At the same time, the material can achieve UL94 V-0 flame retardancy without adding any halogen flame retardants, with an oxygen index of up to 38. When burned, it has low smoke and is non-toxic, releasing only carbon dioxide, water, and silicon dioxide - substances that are completely harmless to human health and the environment. The toxicity of smoke has reached the highest safety level ZA1 for polymer materials, and has passed the EU RoHS certification, making it a truly green fire-resistant material.

In terms of electrical performance, ceramicized silicone rubber has also delivered a convincing answer. Before sintering, its volume resistivity is not less than 10 ¹⁵Ω· cm. Even after burning in a flame at 1000 ℃ for 30 minutes, the volume resistivity remains at the level of 10 ⁷Ω· cm, which is sufficient to ensure the integrity of power transmission lines in a fire. This feature has enabled it to successfully pass the circuit integrity test specified in GB/T 19216.21, which includes 90 minutes of fire exposure and 15 minutes of cooling at 950 ℃ to 1000 ℃, as well as the BS6387 spray vibration test, achieving a fire resistance level of Class A.

From a technological perspective, ceramicized silicone rubber can be considered the "most worry free high-performance material". Its preparation process is almost identical to that of ordinary silicone rubber - it can be completed in three steps: sulfurization, extrusion, and vulcanization. The commonly used vulcanizing agent is bis (2,4), with an addition amount of only 1% to 2% of the mixed rubber. After turning on the open mill to the rolling mill, it is evenly added and then rolled several times before being used. Cold extrusion technology is required during extrusion, with the temperature of the screw, head, and body controlled below 30 ℃.

The length of the die sizing section is about half that of ordinary rubber, and the core rod and die must be polished with a mirror finish. For vulcanization, hot air vulcanization furnace or warm water vulcanization can be selected, and the temperature can be flexibly adjusted between 150 ℃ and 300 ℃ according to the cable specifications. The entire process does not require the purchase of special equipment, and traditional silicone rubber processing production lines can achieve large-scale production with high production efficiency, low energy consumption, and controllable costs. Compared with traditional magnesium oxide mineral insulated cables and mica tape wrapped fire-resistant cables, the economic advantages are extremely prominent.

Regarding liquid silicone rubber, please refer to our website for details: IOTA Liquid Silicone Rubber