Precipitated Silica is a synthetic, amorphous form of silicon dioxide (SiO₂) produced by chemically precipitating sodium silicate solutions with acid under controlled conditions. The resulting ultra-fine white powder features a highly porous structure, large surface area (BET 150–380 m²/g depending on grade), and exceptional functional properties that make it indispensable across multiple industries.

Censil precipitated silica, manufactured by Longyan Shenghe Chemical Co., Ltd. in Fujian, China, serves five major application categories. First, as a feed additive, it acts as a carrier for vitamins, choline chloride, acidifiers, and antibacterials — converting liquid actives into free-flowing powders while functioning as an anti-caking agent in premixes and compound feed. Second, in coatings and paints, precipitated silica operates as a Matting Agent, rheology modifier, and anti-settling additive — controlling gloss levels and preventing pigment sedimentation in water-based, UV, and solvent-based systems. Third, in the rubber and tire industry, it serves as a high-performance reinforcing filler that reduces rolling resistance by 20–30% compared to carbon black, enabling green tire technology and improved fuel efficiency. Fourth, as a food-grade anti-caking agent (E551), it prevents clumping in powdered foods, spices, seasonings, and nutritional supplements while meeting FDA 21 CFR and EU food additive standards. Fifth, in industrial applications including adhesives, sealants, defoamers, and battery separators, precipitated silica provides thixotropic control, reinforcement, and structural functionality.

Censil offers over 30 specialized grades covering feed, food, rubber, coating, hydrophobic, and battery applications — all manufactured under FAMI-QS, ISO 9001, and ISO 22000 quality management systems.

Sensilchem (Sensil International LLC) holds one of the most comprehensive certification portfolios among precipitated silica manufacturers worldwide, ensuring that Censil silica products meet the strictest international quality, safety, and regulatory standards for feed, food, and industrial applications.

The flagship certification is FAMI-QS (Certificate No. CNBJ380053-CN), audited by Bureau Veritas and valid through March 2027. FAMI-QS is the global gold standard for feed ingredient safety, and Censil is the only Chinese precipitated silica supplier holding this certification for feed specialty ingredients — covering all 13 feed grade silica grades. For food applications, Censil holds ISO 22000 (Certificate No. 114FSMS2300022, valid through January 2029) and HACCP certification, demonstrating full food safety management system compliance. Censil food grade silica (E551) is compliant with FDA 21 CFR 182.3392 (GRAS status) and FDA 21 CFR 173.340, and is listed under EU E551 regulations. Additionally, Censil holds both Kosher and HALAL (Certificate No. SSPY-201318-32223-R3, valid through June 2027) certifications for multi-market access.

For quality and environmental management, Censil maintains ISO 9001 and ISO 14001 certifications. All products are REACH compliant under EU regulations, and CAS No. 7631-86-9 is registered in TSCA (USA), AICS (Australia), PICCS (Philippines), DSL (Canada), and ECS (China). Heavy metal compliance meets Pb ≤5 mg/kg for feed grades and Pb ≤30 mg/kg for rubber grades, satisfying EU, US, and Asian regulatory limits.

These certifications ensure that Censil precipitated silica can be seamlessly imported and used across 40+ countries without regulatory barriers.

Sensilchem maintains a flexible minimum order quantity (MOQ) policy designed to serve both large-scale industrial buyers and smaller formulators evaluating Censil precipitated silica for new applications. The standard MOQ for most Censil silica grades is 1 metric ton (1,000 kg), which applies to all powder, micropearl, and granular grades across the feed, food, rubber, coating, and hydrophobic product lines.

For customers conducting initial trials or qualification testing, Censil offers free 200g samples that can be requested directly through the website. These samples allow formulators to evaluate the performance of specific grades — such as Censil feed grade silica as a carrier for choline chloride, or CensilMat coating grade silica as a matting agent — before committing to commercial volumes. For trial batches between sampling and full production orders, Censil can accommodate smaller quantities of 200–500 kg upon request, subject to availability and grade.

For bulk orders, Censil provides significant logistics advantages. Standard packaging includes 20 kg PP woven bags, 25 kg paper valve bags, 14.4 kg EVA bags, and 300–790 kg jumbo/big bags depending on the grade. Full container loads (20ft FCL) typically hold 18–22 metric tons depending on packaging format. As a factory-direct manufacturer shipping from China, Censil offers 30–50% cost savings over imported brands such as Evonik SIPERNAT, PPG FLO-GARD, and Grace Zeodent, with typical lead times of 2–3 weeks from order confirmation.

To request a quote or discuss volume pricing, Contact Censil at john@sensilchem.com or call +86 0597-2200392.

Requesting a free sample of Censil precipitated silica is a simple, no-obligation process designed to help formulators, manufacturers, and procurement teams evaluate product performance before making purchasing decisions. Sensilchem offers free 200g samples across the entire Censil product range — including feed grade, food grade, rubber grade, coating grade, hydrophobic, Fumed Silica, sodium aluminosilicate, and battery separator grade silica.

To request a sample, visit the Request a Sample page on sensilchem.com and complete the brief form with your company name, contact details, the specific grade(s) of interest, and your intended application. Alternatively, you can email john@sensilchem.com or call +86 0597-2200392 directly. Censil's technical team is available to recommend the most suitable grade for your application — whether you need a silica carrier for feed additives, a matting agent for coatings, a reinforcing filler for rubber compounds, or an anti-caking agent for food powders.

Once your request is processed, samples are typically shipped within 3–5 business days via international express courier (DHL, FedEx, or UPS). Each sample is accompanied by a Technical Data Sheet (TDS) and Certificate of Analysis (COA) for the specific batch, enabling immediate laboratory evaluation. For customers switching from imported brands such as Evonik SIPERNAT, Solvay Tixosil, or Grace FLO-GARD, Censil can provide equivalent grade recommendations and side-by-side comparison data to accelerate qualification testing.

Free samples are available to qualified business customers worldwide, supporting the Censil commitment to transparent, evidence-based product evaluation.

Censil precipitated silica offers one of the shortest lead times in the global silica industry, with standard delivery within 2–3 weeks from order confirmation for most grades and packaging formats. This rapid turnaround is made possible by Censil's integrated manufacturing model — from raw material sourcing to finished product packaging, all operations are controlled at the Longyan Shenghe Chemical production facility in Fujian, China.

The lead time structure is as follows. Standard stock grades (popular feed, food, and rubber grades in 20 kg bags or 20 kg/25 kg packaging) typically ship within 7–10 business days from order confirmation, as these are maintained in finished goods inventory. Make-to-order grades (specialty coating matting agents, custom hydrophobic treatments, battery separator silica, or non-standard packaging) require 14–21 days for production, quality testing, and packaging. Bulk orders in 500 kg big bags or 790 kg jumbo bags may add 2–3 additional days for specialized packaging operations.

Compared to international competitors, Censil's lead time advantage is significant. Evonik SIPERNAT and Solvay Tixosil typically require 6–10 weeks for delivery to Asian and American markets, while PPG FLO-GARD requires 4–6 weeks. Grace Zeodent delivery times range from 4–8 weeks depending on origin. Censil's 2–3 week lead time represents a 50–70% reduction in supply chain wait times — a critical advantage for manufacturers managing just-in-time production schedules or responding to urgent demand spikes.

Censil also provides logistics management support, helping customers coordinate ocean freight, customs documentation, and last-mile delivery from Chinese ports to destinations worldwide. The US entity, Sensil International LLC (El Cajon, CA), provides additional supply chain reliability for North American customers.

Censil precipitated silica offers a comprehensive range of packaging options designed to meet the diverse handling, storage, and logistical requirements of customers across feed, food, rubber, coating, and industrial applications. The packaging portfolio spans small-format bags for manual handling to bulk formats for automated industrial processing.

Standard bag packaging includes four primary formats: (1) 20 kg PP woven bags — the most common format for feed and industrial grades, offering durability during transport and stacking; (2) 25 kg paper valve bags — preferred for food grade and premium grades, providing moisture protection and professional presentation; (3) 14.4 kg EVA bags — used for specialized food and pharmaceutical applications where contamination prevention is critical; (4) 15 kg PP woven bags — available for micropearl grades with specific density requirements.

Bulk packaging options include: (1) 300 kg jumbo/big bags — suitable for medium-volume industrial users; (2) 330 kg big bags — optimized for coating and rubber grade handling; (3) 500 kg big bags — for high-volume feed and food manufacturers; (4) 625 kg and 700 kg jumbo bags — maximum-efficiency format for large-scale operations; (5) 790 kg big bags — the largest standard format for bulk industrial consumption.

All packaging is designed for safe stacking, moisture protection, and compatibility with automated filling and dispensing systems. A full 20-foot container (FCL) typically holds 18–22 metric tons depending on packaging format. For customers requiring custom packaging — including private labeling, specific bag materials, or palletized configurations — Censil offers flexible OEM/ODM packaging services. Contact john@sensilchem.com for custom packaging inquiries.

Precipitated silica and fumed silica are both synthetic amorphous silicon dioxide (SiO₂) materials, but they differ fundamentally in production method, particle structure, performance characteristics, and cost — making each suitable for different applications.

Precipitated silica is manufactured through a wet chemical process: sodium silicate solution is reacted with acid (typically sulfuric acid) under controlled pH, temperature, and agitation conditions. The resulting precipitated silica has primary particle sizes of 5–30 nm that aggregate into larger structures, producing BET surface areas of 100–380 m²/g. Precipitated silica is available in powder, micropearl, and granular forms, with extensive customization of surface area, pore volume, particle size, and surface treatment. Censil precipitated silica serves as a feed additive carrier, anti-caking agent, rubber reinforcing filler, coating matting agent, and rheology modifier — at a cost-effective price point suitable for large-volume industrial applications.

Fumed silica (gas-phase silica) is produced by flame hydrolysis of silicon tetrachloride (SiCl₄) in a hydrogen-oxygen flame at temperatures exceeding 1,000°C. This yields ultra-fine primary particles of 7–40 nm with extremely high purity (SiO₂ ≥99.9%) and surface areas of 50–400 m²/g. Fumed silica's three-dimensional chain-like aggregate structure provides exceptional thickening efficiency, making it ideal for high-performance rheology modification in coatings, adhesives, and specialty applications. However, fumed silica costs 2–5× more than precipitated silica per kilogram.

For most industrial applications — including feed anti-caking, rubber reinforcement, and coating matting — Censil precipitated silica delivers equivalent functional performance at significantly lower cost. Censil also offers fumed silica grades (Censil 150, 200, 300, 380) for applications requiring ultra-high purity or nano-scale rheology control. The choice between precipitated and fumed silica depends on the required performance level, acceptable cost, and specific application demands.

Yes, Censil specializes in providing custom silica specifications tailored to unique application requirements. As a vertically integrated precipitated silica manufacturer with in-house R&D capabilities, Sensilchem can modify key technical parameters — including surface area, pore structure, particle size distribution, surface treatment, and physical form — to create silica solutions that precisely match customer formulations.

Censil's customization capabilities span five dimensions. Surface area adjustment: BET surface area can be engineered from 50 m²/g to over 380 m²/g by controlling precipitation conditions, enabling optimization for applications ranging from low-absorption fillers to high-performance carriers. Particle size control: Through milling and classification, Censil can deliver particle sizes from ultra-fine powders (d50 <5 µm) to coarse micropearls (d50 150–450 µm) and granules. Surface treatment: Censil offers multiple hydrophobic surface treatment options — PDMS (polydimethylsiloxane), HMDS (hexamethyldisilazane), alkylsilane coupling agents, and custom silane treatments — to achieve specific hydrophobicity levels, dispersion characteristics, and compatibility with organic matrices. Physical form: Products can be manufactured as free-flowing powders, uniform micropearls, or low-dust granules depending on handling and processing requirements. Purity specifications: For battery separator and electronics applications, Censil can produce ultra-low iron (<300 mg/kg) and low metal impurity grades.

The custom development process begins with a technical consultation to understand your application requirements, followed by lab-scale trial production, sample delivery (typically 2–3 weeks), and iterative optimization until the target specifications are achieved. Censil's custom silica solutions have been successfully deployed for specialty rubber compounds, proprietary coating formulations, unique feed additive carriers, and novel industrial applications.

To discuss custom specifications, contact Censil's technical team at john@sensilchem.com with your target parameters and application details.

Sensilchem (Sensil International LLC) is a global precipitated silica supplier serving customers across 40+ countries spanning Asia, Europe, North America, South America, the Middle East, Africa, and Oceania. With dual operational bases — the manufacturing facility at Longyan Shenghe Chemical Co., Ltd. in Fujian, China, and the US entity Sensil International LLC in El Cajon, California — Censil provides reliable supply chain coverage for both Eastern and Western hemisphere markets.

Asia-Pacific represents Censil's largest market, with strong presence in China (domestic market), Japan, South Korea, India, Southeast Asia (Vietnam, Thailand, Indonesia, Malaysia, Philippines), Australia, and New Zealand. Key applications include feed additive carriers for Asian poultry and aquaculture industries, rubber silica for tire manufacturing hubs, and coating silica for construction and furniture markets.

Europe is a major growth market where Censil silica is used as a cost-effective alternative to Evonik SIPERNAT, Solvay Tixosil, and Acematt matting agents. Censil's FAMI-QS certification and REACH compliance enable seamless import into EU member states for feed, food, and industrial applications. North America is served through the US entity (Sensil International LLC, El Cajon, CA), providing FDA-compliant silica for feed, food, coatings, and rubber applications. Censil's TSCA registration ensures regulatory compliance for US market entry.

Middle East and Africa represent emerging markets where Censil's HALAL certification is particularly valued for feed and food applications in Muslim-majority countries. South America serves growing feed and rubber industries in Brazil, Argentina, and Chile. Censil actively participates in international trade exhibitions (listed on the EXPO page) to maintain direct relationships with customers across all regions.

Regardless of destination, Censil offers factory-direct pricing with 30–50% cost savings over imported brands, 2–3 week lead times, and comprehensive logistics support including export documentation, ocean freight coordination, and customs clearance assistance.

Switching from imported silica brands to Censil precipitated silica is a straightforward process that typically achieves equivalent or superior performance at 30–50% lower cost. Censil has been specifically engineered as a drop-in alternative to leading international brands — including Evonik SIPERNAT®/HDK®, PPG FLO-GARD™, Grace Zeodent®, Solvay Tixosil®, and Aerosil® — with matching specifications that minimize or eliminate reformulation requirements.

Step 1: Identify Your Current Grade. Match your existing silica product to the corresponding Censil equivalent. For feed applications: SIPERNAT® 22S/50S → CENSIL 260PA/260PB; FLO-GARD™ → Censil feed grade carrier silica; Grace Zeodent® → Censil 270P/280P. For coating applications: Acematt® OK 412 → CensilMat 3651C; SYLOID® ED 30 → CensilMat OK-520. For rubber: Ultrasil® 7000GR → Censil 180GR; Zeosil® 1165MP → Censil 165MP. For food: SYLOID® 244 FP → Censil F-10. For hydrophobic: SIPERNAT® D17 → CENSIL D17; Aerosil® R202 → Censil D50.

Step 2: Request a Free Sample. Censil provides free 200g samples with full TDS and COA documentation. Side-by-side comparison data sheets are available showing specification-level equivalency between Censil grades and their international counterparts.

Step 3: Laboratory Testing. Conduct parallel testing with your existing formulation using the Censil equivalent grade. Most customers find that Censil silica performs within the same specification range — matching BET surface area, DBP absorption, particle size, and SiO₂ purity — requiring zero or minimal formulation adjustment.

Step 4: Trial Production. Scale up to a 200–500 kg trial batch to validate performance in production equipment. Censil's technical team provides remote support during trial runs.

Step 5: Commercial Switch. Once trial results confirm equivalence, place a commercial order with typical 2–3 week delivery. Many customers report that Censil not only matches but exceeds imported silica in consistency and purity, while delivering substantial cost savings.

Censil's switching support includes free technical consultation, grade matching recommendations, comparison data sheets, and on-site technical support for major accounts. Contact john@sensilchem.com to begin your evaluation.