| HS Code | 896443 |
| Product Name | AEROSIL R 202 / R 208 |
| Chemical Class | Hydrophobic Fumed Silica |
| Surface Area Bet | 100 m²/g |
| Primary Particle Size | 12 nm |
| Loss On Drying | < 0.5% |
| Ph | 3.5 - 4.5 (4% in water) |
| Carbon Content | 3.5 - 4.5% |
| Tamped Density | 40 - 60 g/l |
| Specific Silica Content | ≥ 99.8% |
| Appearance | white, fluffy powder |
As an accredited AEROSIL R 202 / R 208 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | AEROSIL R 202 / R 208 is packaged in 10 kg multi-layer paper bags with polyethylene liners for moisture protection. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): 68 bags x 10 kg on 1 pallet, 10 pallets; total net weight: 6,800 kg per container. |
| Shipping | AEROSIL R 202 and R 208 are shipped as white, hydrophobic fumed silica powders. They are typically packed in multi-layer paper bags with polyethylene liners (usually 10 kg or 20 kg per bag) or bulk bags. Keep containers tightly sealed, store in a dry place, and handle to avoid dust formation. |
| Storage | AEROSIL R 202 / R 208 should be stored in tightly sealed original containers in a cool, dry, and well-ventilated area, protected from moisture, heat, and direct sunlight. Avoid storing near sources of ignition and incompatible substances. Ensure containers are kept upright and handled carefully to prevent spillage and dust formation. Always follow local regulations and the manufacturer’s recommendations for storage. |
| Shelf Life | AEROSIL R 202 / R 208 has a shelf life of 24 months from production date when stored in original, unopened packaging. |
Our AEROSIL R 202 and R 208 fumed silicas support critical performance needs in advanced industrial formulations. As the manufacturer, we focus on real downstream sectors with demanding quality controls and process requirements. Below, we detail major end-use applications, industry regulations, recommended ratios, integration stages, and representative finished products.
Silicone sealant and industrial adhesive producers rely on hydrophobic fumed silica to improve rheological performance, prevent sagging, and control extrusion properties. We supply these grades for both neutral-cure and acetoxy-cure silicone systems, serving construction, glazing, and automotive gasketing. Formulators request consistent batch quality to comply with demanding specification requirements, particularly in automated dosing and mixing lines where rheology modifiers impact final assembly quality and throughput.
Industry compliance standards
Typical usage ratio
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Coatings formulators use these hydrophobic fumed silicas for anti-settling, sag resistance, and to influence matting effects in solvent-based and high-solids coatings. Consistent silica characteristics remain essential in advanced architectural, marine, and industrial equipment protection, since application properties must remain stable across storage and wet film thickness. Our customers require unwavering quality to pass QUV aging, impact, and application testing required for global regulatory approval and large infrastructure projects.
Industry compliance standards
Typical usage ratio
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Polyolefin and cross-linked polyolefin (XLPE) cable manufacturers integrate our fumed silica into jelly filling compounds and cable insulation layers. The silica provides controlled viscosity and prevents oil separation during cable installation and use, directly impacting moisture barrier performance and service reliability. Consistency is key, since filler distribution and water blocking must meet international safety and operation standards.
Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
Grease formulators utilize hydrophobic fumed silica as a thickener to achieve high dropping points, shear stability, and controlled oil bleed in specialty greases. This is particularly relevant in synthetic, silicone, and PTFE-based lubricants for extreme temperature and precision applications. Regulatory controls focus on high-temperature service, food machinery greases, and electrical/electronics contact lubricants, each with strict material compatibility requirements and batch-to-batch performance evaluation.
Industry compliance standards
Typical usage ratio
Downstream process integration
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Ink and UV-curable resin manufacturers depend on hydrophobic fumed silica to control viscosity, leveling, and pigment suspension. These effects are critical for high-speed digital, flexographic, and offset printing where printhead and transfer roll performance depends on ink rheology and anti-settling. Production adheres to stringent migration, curing, and safety standards, especially for food packaging and graphic inks distributed in highly regulated markets.
Industry compliance standards
Typical usage ratio
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Personal care manufacturers use fumed silica as a structuring agent and anti-caking aid in color cosmetics, skin care creams, and toothpaste. The material enables stable textures in anhydrous lipsticks, pressed powders, and water-free serums by dispersing oils and providing slip. Strict regulatory oversight requires full traceability and ingredient listing for products distributed in global retail channels, along with allergen and purity documentation.
Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
Competitive AEROSIL R 202 / R 208 prices that fit your budget—flexible terms and customized quotes for every order.
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Every manufacturing line demands consistency, stability, and reliability. AEROSIL R 202 and R 208 come from decades of silica know-how. Our plant teams produce these fumed silicas using a controlled flame hydrolysis process followed by tailored surface treatment. That sort of technical grind doesn’t just sound impressive—it ensures batch-to-batch reproducibility, predictable behavior in your process, and results customers notice, whether in a high-end coating or a challenging resin compound.
Not all fumed silicas perform the same way. Standard hydrophilic grades have their place, especially where basic thickening or anti-caking takes priority in water-based environments. R 202 and R 208 step beyond that. Both feature surface modification with organosilanes that deliver strong hydrophobic character. The practical result: these silicas disperse cleanly in systems where water-repellent performance matters—such as silicone sealants, industrial adhesives, or specialty paints. The switch to hydrophobic treatment solves issues like thickening instability, low humidity sensitivity, and shelf-life headaches.
R 202 gets its top reputation thanks to its octylsilane functional groups. We’ve watched it add much-needed reinforcement to silicone elastomers, helping those cures keep their resilience and elongation. R 208 uses a similar treatment base but targets applications asking for even tighter control over thixotropy and rheological balance. In both cases, we’ve learned that processing is easier, and cleaning downtime shrinks—no more clumping or dusting challenges you’d see with some untreated powders.
The surface area, particle size, and bulk density in AEROSIL R 202 and R 208 all tie directly to performance and handling. Fine particle size means bigger surface area—think upward of 100 m2/g—which brings strong interaction with your formula. In real use, small differences in surface area can make or break how a fumed silica works in silicone. Our reactor teams have fine-tuned process conditions to hit those tight targets, minimizing batch drift and giving end-users an easier time during mixing or dispersion.
Each powder flows freely, doesn’t cake in bagging, and pours efficiently into mix tanks. Technicians see almost no sticking to equipment in dry transfer—huge in automated lines focused on powder hygiene. Good dispersibility means less re-agitation, no localized clumps, and quicker wet-out times. Coating lines see more consistent viscosity—right from the pre-mix to the final application head.
Anyone who has handled fumed silica knows: the wrong silica can mean additional cleaning, wasted time, and scrap. Our years spent troubleshooting on real production floors led us to tweak surface chemistry and drying protocols until R 202 and R 208 met practical needs. Production crews reported easier cleanup of hoses and mixers. Bulk handlers stopped fighting with slow-flow dry powder, and shifted to more automated bag emptying. No one on our staff misses fighting silica bridges in hoppers at the start of a new shift.
Another story stands out from a adhesives customer. Their original silica would agglomerate during high-shear mixing, killing throughput and clogging filters. After switching to R 202, dispersion time dropped by almost a third on their twin-screw extruder. That sort of result motivated us to invest further in testing plantside solutions, not just lab data.
Industrial coatings face unpredictable environments: heat, high humidity, UV, chemical attack. In field tests, R 202 and R 208 both stayed resilient across temperature cycles. Their hydrophobic layers reject water, reducing risk of corrosion and spotting in architectural and marine paints. Our teams collaborated directly with scale-up chemists to fine-tune the filler-to-binder ratios, dialing in rheology so that pigments resist settling and finished films spread smoothly.
On line trials, R 208 performed particularly well in solventborne formulations used outdoors, resisting sag even during fast roll application. Rework dropped, material yield rose, and spray operators saw more reliable laydown, even at lower film builds.
Silicone formulators face tough balancing acts: give enough reinforcement, but don’t overthicken the base. R 202 struck this balance in multiple industrial settings. We watched line operators add it directly to high-consistency silicone under vacuum—no dusting, quick wet-in, no ghosting in the final extrusion. The reinforcement provided by the fine hydrophobic surface stabilized elongation and kept snap-back character even after aging.
R 208 brought slightly finer control over thixotropy, which helped one of our sealant customers reduce vertical flow during cure. Caulking guns ran smoother, bead formation tightened up, and field techs called out easier tooling and less sticky cleanup of hands and tools. That saves time at every level.
Powder management in bulk matters more than specs on a page. With R 202 and R 208, bulk density lands in a range that makes both manual transfer and pneumatic handling straightforward. Our operators see little settling or compaction during storage. Industrial-scale plant bags fill and empty efficiently through gravity-feed, keeping downtime low.
Worker health matters to us. In production, we invest in dust control at filling and transfer points. Our process keeps airborne silica at a minimum without sacrificing flow. Line crews appreciate the cleaner environment, and long-term exposure risk has dropped compared to older grades with lighter, fluffier structure.
Hydrophobic silica performs where moisture and environmental stability come into play. In moisture-cure systems—whether adhesives, sealants, or paints—uncoated fumed silicas can absorb water during storage or processing, ruining shelf life and causing failures in end use. Our line teams have seen how R 202 and R 208, with their surface-treated structure, keep that from happening. Blisters, caking, premature thickening—these issues saw a steep decline once the switch happened. Clients running epoxy composites or hybrid sealants benefit most, especially where outdoor weathering and damp environments cause trouble.
We also see strong demand in greases and lubricants. The interplay of oil base and water rejection makes tack and thickening more robust under a range of mechanical and thermal loads. Maintenance staff using greases filled with R 208 report less oil separation and longer change intervals. The chemistry team studied high-shear and temperature cycling: materials held up, keeping equipment running longer between re-lubrication cycles.
Technical decisions don’t just come down to specs. Chemists and process engineers need to know which grade delivers the right properties for their line. Both R 202 and R 208 serve hydrophobic roles, but their surface chemistry fine-tunes application fit.
R 202 features octylsilane treatment. It shines in silicone rubbers and resins where dynamic reinforcement and low moisture absorption stand out. Operators targeting strong network formation in elastomers report this grade helps with clarity and transparency in silicone. Both our in-house feedback and customer testing show stable mechanicals across months of storage and use.
R 208, with its customized silane blend, pushes performance in solventborne and high-solids coating systems. It works well where thixotropy must be tight and storage sag needs to be minimized. Paint shops using rapid-drying formulas noticed better shelf stability and fewer viscosity spikes over time. Lab techs exploring new resin blends saw that pigment float and settling reduced, translating to more vivid and reliable color pay-off for end-users.
In day-to-day handling, R 202 presents a slightly less aggressive thickening profile than R 208. Those looking for subtle reinforcement and easier processing in clear elastomers tend to favor R 202. R 208 enters the conversation where critical rheology and high solids must coexist—think thick adhesives or self-leveling coatings. Knowing these subtle differences means buyers skip guesswork and cut costly pilot runs.
Building every batch of AEROSIL means continuous feedback from the shop floor. It’s a dialog between process controllers, maintenance staff, and quality labs. For example, early issues with particle size drift prompted better real-time analytics at our reactors. By tightening up temperature ramping and feed rates, we closed in on surface area targets—bringing more consistency to customers running high-stakes industrial processes.
Every new customer trial surfaces fresh lessons: an adhesives maker running novel isocyanate chemistries showed us how R 208’s modified surface staves off moisture lock-up, keeping open time on point. Painters on marine jobs pointed to better water beading during field trials, meaning our post-treatment processes left enough active surface for strong hydrophobicity, but stopped short of causing slippage or loss of adhesion.
Feedback loops keep us grounded. In coatings, one partner using R 202 in their deck finish system tested application under hot, humid weather and saw less flow-off and edge beading. Formulators shared improved anti-settling in storage, with pigment suspension stable through season changes. Silicone compounders sent samples from long outdoor exposure cycles—again, no loss in flexibility or spontaneous yellowing.
Those working with polyurethane systems brought up another insight: consistent particle size and surface structure prevent shrinkage and microbubble entrapment, key on factory lines making soft foams for automotive applications. With R 208, they measured smoother cell structure, improved air release on mixing, and less waste.
This sort of real-world feedback inspires tweaks in our production line, nudging us to refine surface chemistry or test new functional groups, always with the end user’s challenge in mind.
As compliance bar rises—think REACH, California Prop 65, and other regional controls—we’ve synced up our quality management and lab analysis. No material leaves the plant without full documentation. Modern traceability lets technical managers review each lot’s analytical profile down to ppm impurities and batch dates. We invest in single-source raw silane and tight process controls, ensuring customers don’t face sudden quality shifts or re-certification paperwork.
We sit in on customer audits and support them directly during product qualification, helping their plants save time on quality approval. That sort of long-haul partnership means both sides learn together—whether it’s tighter filter fineness or unique labeling for precise feed.
Sustainability isn’t just a buzzword. We’ve seen the cost of waste, scrap, and energy inefficiency in manufacturing. R 202 and R 208, owing to predictable dispersion and efficient dosing, cut down on overuse and mix errors. Process engineers calculated lower energy use on high-shear mixers and less need for secondary additives, trimming the environmental footprint.
We leaned heavily into minimizing dust—not just for operator health but to cut down on product loss to filters and vacuum systems. Our packaging lines use materials that stand up to rough handling but are fully recyclable, helping downstream users shrink landfill contribution.
No two users run identical lines. We spend as much time listening as selling. It’s not enough to provide a spec sheet and walk away. Adhesive formulators ask us to visit their pilot plants and run side-by-side tests against standard and competitive hydrophobic silicas. We send technical staff to walk their lines, pinpoint dosage and dispersing issues, and follow up weeks later for honest feedback. Over time, these partnerships build trust—and give us new ideas for process or chemistry improvements.
Many cases stand out: an automotive sealant maker saved on downtime as improved powder flow meant more time spent filling and less fighting with powder transfer. A coatings R&D group reported more predictable rheology, letting them push performance limits without sacrificing consistency. Each new collaboration feeds lessons back to our plant teams and chemists, driving better batches for everyone.
Choosing between R 202 and R 208 isn’t just about data tables or buzzwords. Our technical liaisons ask buyers about end-use—exterior paint, insulating glass, injection-molded silicone, structural adhesive. We steer questions toward shelf-life, line speed, storage conditions, viscosity targets, and downstream handling. Only then do we recommend grade, dosage, and test run conditions.
Resin chemistry, end-use environment, and cost targets all influence the best path. Many start with one grade and, thanks to open communication, discover mid-project that switching brings unexpected time or material savings.
We don’t build new grades in isolation. Larger research and technical teams bring insights from every sector—tire compounds, personal care thickeners, specialty fillers, aerospace sealants. These conversations shape the next iteration of products, drive tweaks in surface chemistry, and sharpen our quality control focus.
Failures—whether sticky clumping during powder handling, unpredictable viscosity spikes, or loss of impact resistance—push our teams to test new processes and formulations. Our development group works side by side with production, refining workflow, trialing advanced organosilane treatments, and stress-testing batches at pilot scale. That’s the only way to guarantee R 202 and R 208 stay ahead of tougher market demands and rising regulatory expectations.
Our direct experience in producing, handling, and scaling AEROSIL R 202 and R 208 comes from hands-on manufacturing, not third-party trading. The feedback from plant floors, pilot lines, and technical teams continually shapes the finished product. We see firsthand what works under real-world pressures, spot new problems early, and move quickly to solve them.
Whether the challenge is optimizing a new adhesive, solving a persistent sag issue in a marine paint, or cutting downtime from powder handling, our approach remains grounded in practical chemistry and open collaboration. Customers who work with us join in the problem-solving and benefit from the lessons learned across industries and continents. Continued investment in better process control, worker safety, and responsible sourcing keeps us moving forward—just as much as pride in every finished bag of silica.
