Spherical Fused Silica Powder for Silicone Rubber CAS 7631‑86‑9 is amorphous fused silica produced via high‑temperature flame spheroidization, classification and purification. Smooth spherical particles reduce compound viscosity during kneading. It acts as functional reinforcing filler for HTV high‑temperature vulcanized silicone rubber and LSR liquid silicone rubber. The filler enhances dimensional stability, provides reliable electrical insulation and assists moderate thermal dissipation for s

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Spherical Fused Silica Powder for Silicone Rubber CAS 7631‑86‑9, Reinforcing Filler for HTV LSR Thermal Conductive & Insulating

This silicone‑rubber‑grade spherical fused silica powder is produced from high‑purity quartz raw material through high‑temperature flame fusion, droplet spheroidization, multi‑stage air classification and impurity removal. Finished particles are amorphous spherical SiO₂ with narrow controlled particle‑size distribution. The smooth rounded particle morphology differs from fumed silica with extremely high specific surface area. It brings lower compound viscosity during rubber kneading and mixing processes, which permits higher filler loading within silicone rubber formulations.

Fumed silica is widely adopted for high‑transparency silicone rubber reinforcement; however, high specific surface area of fumed silica sharply increases compound viscosity and restricts maximum filling content. This spherical fused silica serves as semi‑reinforcing bulk filler. It increases the hardness, compressive modulus and dimensional stability of cured silicone rubber, reduces thermal expansion of elastomer matrix, and suppresses shrinkage during vulcanization. It provides good electrical insulation performance and delivers moderate thermal conduction path inside the rubber network. It cannot achieve ultra‑high thermal conductivity; for extreme thermal‑conductive requirements, additional boron nitride or alumina fillers are still required.

For HTV high‑temperature vulcanized solid silicone rubber, the powder is incorporated during internal mixer and two‑roll mill compounding. It improves shape retention of extruded and molded silicone profiles, gaskets and insulating rubber parts. It lowers thermal expansion so finished rubber components exhibit less deformation under fluctuating service temperatures.

For LSR liquid silicone rubber, controlled particle‑size distribution helps maintain suitable slurry viscosity for injection molding. It reduces thermal‑induced shrinkage of precision LSR molded parts, which is critical for electronic silicone sealing elements. When surface silane modification is further applied to this spherical fused silica powder, interfacial bonding between inorganic silica and silicone polymer matrix can be further improved, minimizing the risk of filler‑matrix delamination under long‑term thermal aging.

Trace metallic impurities are controlled to guarantee consistent insulating performance for electronic‑grade silicone rubber. During rubber compounding, prolonged intense high‑shear milling should be avoided to prevent fracture of spherical particles. Broken sharp fragments would increase rubber compound abrasiveness and may accelerate wear of injection molds and extrusion screws.

Filler loading must be optimized. Excessive addition will increase rubber hardness significantly and cause loss of elasticity and elongation at break, making the finished silicone parts brittle. Insufficient loading cannot achieve expected dimensional stabilization and insulation improvement.

The powder should be stored in sealed moisture‑proof packaging within dry warehouse. Adsorbed surface moisture will interfere with platinum‑cured LSR vulcanization and may generate micro‑bubbles inside cured rubber articles. Strict segregation from other coarse or ultra‑fine silica grades is required to avoid cross‑contamination during transportation, storage and feeding. This spherical fused silica powder is a key semi‑reinforcing mineral filler for HTV and LSR silicone rubber used in insulating and moderate heat‑dissipation elastomer components.

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Jishengya Technology

Shenzhen Jishengya Technology Co., Ltd. is located in Shenzhen, a special economic zone, and is a comprehensive technology enterprise integrating independent R&D, production and sales.