Silicon Metal 421 Chemical Grade For Silicone

Silicon Metal 421 is produced using high-quality quartz stone and low-ash carbonaceous reducing agents. The manufacturing process involves high-temperature smelting in closed submerged arc furnaces, multi-stage refining to remove impurities, and precise crushing and grading. Visually, it presents as silver-gray lumps or granules with a metallic luster; it is characterized by its hardness, strong chemical stability, and high reactivity. It is fully compatible with mainstream silicone synthesis processes-such as fluidized bed and fixed-bed reactors-effectively enhancing reaction conversion rates, minimizing byproduct generation, and reducing production costs.

Silicone Monomer Synthesis: As a core raw material, it reacts with methyl chloride in the presence of catalysts to produce methylchlorosilanes (key intermediates in silicone monomers), which are subsequently used to manufacture a wide array of silicone products. As the foundational raw material for the silicone industry, it is compatible with all silicone monomer synthesis processes; it achieves conversion rates exceeding 98%, effectively boosting monomer purity and minimizing residual impurities.
Silicone Rubber Production: Used in the production of High-Temperature Vulcanized (HTV) silicone rubber, Room-Temperature Vulcanized (RTV) silicone rubber, and similar materials. It enhances the heat resistance, aging resistance, weather resistance, and mechanical strength of the silicone rubber. Widely applied in sectors such as automotive seals, electronics and electrical appliances, architectural sealants, and medical consumables, it is an essential raw material for medium-to-high-end silicone rubber products.
Silicone Oil and Silicone Resin Production: Used to synthesize methyl silicone oils, phenyl silicone oils, silicone resins, and related compounds. It improves the products' lubricity, electrical insulation properties, and resistance to extreme temperatures (both high and low). Applied in industries such as electronics insulation, mechanical lubrication, coatings, inks, and leather care, it meets the rigorous performance requirements of high-end products.

Other Silicone Derivatives: Can be utilized in the production of derivatives such as silicone coupling agents and silicone surfactants. These are widely applied in fields including composite materials, plastics modification, textile auxiliaries, and cosmetic ingredients, providing high-performance auxiliary materials to downstream industries.
Other Extended Applications: Beyond the silicone industry, it serves as an alloying agent in aluminum alloy production, enhancing the strength, hardness, and heat resistance of aluminum alloys-applications particularly relevant in the manufacturing of automotive engine components. It is also employed in the production of refractory materials, welding materials, and powder metallurgy products; its applications are diverse, and market demand remains stable.

Q1: ​​Can the purity of your 421-grade metallurgical silicon meet the requirements for silicone synthesis?
A1: Absolutely. Our 421-grade metallurgical silicon features a Si content of ≥99.3% (based on our internal control standards), with impurity levels strictly maintained below industry standards: Fe ≤0.38%, Al ≤0.19%, and Ca ≤0.09%. Every batch is accompanied by a Certificate of Analysis (COA), and third-party testing services (such as SGS or BV) are available upon request. It is fully compatible with the synthesis requirements for products such as silicone monomers, silicone rubber, and silicone oil, and has been utilized on a long-term basis by numerous silicone manufacturing enterprises.
Q2: Can you provide customized particle sizes and packaging?
A2: Yes, we can. We support customization for various particle sizes, including 0–1mm, 1–3mm, 3–5mm, and 80–325 mesh. For packaging, options include 1-ton bulk bags (jumbo bags) or 25kg small bags. Additionally, we can customize packaging solutions-such as palletizing, film wrapping, and hazardous material labeling-to align with specific client requirements regarding production processes and transportation logistics.
Q3: What is the Minimum Order Quantity (MOQ)? What is the lead time for delivery?
A3: The Minimum Order Quantity (MOQ) is 1 ton; bulk purchases qualify for more favorable pricing. For domestic orders, shipments are dispatched within 72 hours of payment confirmation. For international orders, the lead time ranges from 15 to 30 days, depending on the destination. We support both Less-than-Container-Load (LCL) and Full-Container-Load (FCL) shipping options, and expedited production and shipping arrangements can be made upon request.

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