| HS Code | 121230 |
| Product Name | AEROSIL 300 / 380 |
| Chemical Name | Fumed Silica |
| Appearance | White, amorphous powder |
| Specific Surface Area | 300–380 m²/g |
| Primary Particle Size | 7–10 nm |
| Ph Value | 3.7–4.5 (4% in water) |
| Loss On Drying | <1.5% (2 hours at 105°C) |
| Loss On Ignition | <2.0% (2 hours at 1000°C, based on substance dried for 2 hours at 105°C) |
| Bulk Density | 30–60 g/l |
| Sio2 Content | >99.8% |
| Moisture Content | <1.5% |
| Refractive Index | Approx. 1.46 |
As an accredited AEROSIL 300 / 380 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | AEROSIL 300/380 is typically packaged in 10 kg multi-layer paper bags with an inner polyethylene liner for moisture protection. |
| Container Loading (20′ FCL) | Container loading (20′ FCL) for AEROSIL 300/380: typically 2,400–2,600 bags (10 kg each), palletized or loose, totaling ~24–26MT. |
| Shipping | AEROSIL 300 / 380 is typically shipped as a fine, white, amorphous fumed silica powder in multi-layer paper bags or FIBCs (big bags). Bags are tightly sealed to prevent moisture ingress. Transport should be in dry, well-ventilated conditions, away from incompatible substances, with appropriate labeling and standard handling precautions. |
| Storage | AEROSIL® 300/380 should be stored in tightly sealed, original containers in a cool, dry, and well-ventilated area, away from moisture and incompatible materials. Protect from direct sunlight and sources of ignition. Prevent dust formation and exposure to static electricity. Handle using appropriate personal protective equipment. Follow local regulations and safety guidelines for storage and handling of fine, powdered silica. |
| Shelf Life | AEROSIL 300 / 380 has a shelf life of 24 months when stored in original unopened containers under dry, cool conditions. |
AEROSIL 300 and 380 are hydrophilic fumed silica grades widely adopted by global manufacturers across key industrial sectors. Their high surface area and purity contribute to specific functional roles in advanced formulations. Below we detail real industry uses supported by regulatory compliance, exact formulation guidance, and process engineering insights from our manufacturing expertise.
Leading silicone sealant producers use AEROSIL 300 and 380 for precise viscosity control, thixotropy development, and sag resistance. Consistent batch-to-batch quality supports gap-filling, anti-settling, and smooth extrusion in both acetoxy and neutral systems. Direct incorporation occurs in the primary mixing phase with vinyl, oxime, or alkoxy functional siloxanes. Particle fineness ensures stable paste rheology and homogeneous crosslinking during room temperature vulcanization (RTV). Finished formulations undergo strict exterior durability, adhesion, and fire resistance verification for compliance in modern façade, insulating, and sanitary joints.
Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
We supply AEROSIL 300 and 380 to major paint and coating plants to control flow, prevent pigment sedimentation, and enhance scratch resistance. Fine silica dispersion prevents flooding in multicolor, metallic, and clearcoat systems. Formulation design incorporates the material pre-dispersed into the resin or solvent phase using bead mills or high-speed dissolvers. End users validate suspension stability over long storage and consistent rheology under temperature cycling, vital for both factory-applied and on-site applications.
Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
Global electronic and automotive adhesive formulators integrate AEROSIL 300 and 380 as anti-settling, thickening, and rheology-adjusting agents, particularly in resin-based, hotmelt, and reactive epoxy or polyurethane systems. Fumed silica ensures homogeneous, non-dripping adhesive lines and mechanical reinforcement in thin-layer and bead applications. Its fine particle profile meets strict electrical insulation and low ionic contamination requirements in sensitive assemblies. Manufacturers qualify each batch under ISO quality controls for compatibility with conductive fillers and flame-retardant additives.
Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
Pharmaceutical manufacturers specify AEROSIL 300/380 as a flow aid and glidant for direct compression and dry granulation. The high surface area reduces interparticle cohesion, optimizing die-filling and tablet uniformity. Facilities reinforce GMP-compliant handling for contamination prevention. Integration occurs at powder blending, either pre- or post-granulation, with precise metering to satisfy flow indices and compaction behavior. All supply complies with global pharmacopeial purity, heavy metals, and microbiological limits.
Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
Composites and FRP molders integrate fumed silica for resin rheology control, avoiding glass fiber settling and controlled thixotropic behavior during lay-up and spray processes. We recommend batchwise adjustment based on viscosity monitoring and gel time curves. Silica grade selection avoids resin haze and maintains clarity for translucent or pigmented parts. Preparation includes slow incorporation under vacuum mixing to fully wet out the surface area and suppress air entrainment before MEKP or other initiator addition.
Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
Ink manufacturers rely on AEROSIL grades for maintaining pigment dispersion, viscosity tuning, and anti-sag properties in high-speed printing applications. The finely controlled particle size prevents nozzle clogging and supports sharp dot definition in press runs. Addition takes place during pigment grind or in the final let-down stage for viscosity balancing. Finished inks exhibit improved shelf life and uniform transfer, validated through rub resistance and migration testing for food, packaging, and label applications.
Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
Competitive AEROSIL 300 / 380 prices that fit your budget—flexible terms and customized quotes for every order.
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Behind every efficient paint, advanced adhesive, resilient sealant, and high-performance silicone lies the quiet work of fumed silica. Many years on the production floor have convinced us that subtle shifts in silica structure and surface area can remake the performance of an entire formulation. This is not idle speculation or borrowed marketing copy—we have seen real-world results from every batch that leaves our own reactors. AEROSIL 300 and AEROSIL 380 illustrate this difference in practice. At first glance, both grades look like nothing more than white, ultrafine powders; the change happens at the nanoscale and under the hood of your product.
AEROSIL 300 and AEROSIL 380 both result from flame hydrolysis of high-purity chlorosilanes, performed in our own optimized reactors. The production environment matters. Control over temperature, chemical ratios, and quenching steps shapes the particle size, specific surface area, and aggregate structure of the resulting silica. We do not treat these factors as afterthoughts or mere technicalities. Every hour of downtime, every slight adjustment to gas flow—these are the moments that define consistency.
AEROSIL 300 carries a specific surface area in the range of 300 m²/g (measured using the BET method), with AEROSIL 380 raising the surface area to around 380 m²/g. In practice, the difference becomes clear once you look at how each type interacts with liquids and resins. Higher surface area materials like AEROSIL 380 grab and immobilize more molecules at their surface. This translates to stronger thickening, more robust thixotropy, and superior anti-settling behavior, especially in low-viscosity systems.
We have spent countless hours observing how minor tweaks in production ripple out into final properties. When someone requests a batch of AEROSIL 300 or 380, our attention turns to the smallest operational detail: precise input control, post-reaction recovery, consistent drying, and time-tested packaging procedures. These steps aren't just boxes on a checklist. Irregularities in the furnace burn pattern, for example, can mean a lot when the downstream application has tight requirements for rheology or dispersion stability.
Our technical teams track each batch from raw material intake to delivery. After production, we routinely validate the critical parameters: primary particle size, aggregate size, loss on drying, pH value, and even residual chloride content. We take these quality controls seriously because we have dealt with the aftermath of bad silica first-hand—batch inconsistencies, clumpy mixing, or storage stability failures are not problems to gloss over.
The practical difference between AEROSIL 300/380 and other grades, such as AEROSIL 200 or AEROSIL 130, is about more than just a number on a spec sheet. We have worked side by side with technical teams from many industries—paint, ink, electronics, elastomers—and seen the knock-on effects of surface area changes on product texture, application, drying, and storage.
AEROSIL 300 and 380 both produce higher thickening power at lower loading levels, especially in low- to medium-polarity systems. Anyone who has tried to stabilize a thin, clear polyurethane knows that not every silica will keep fillers from settling overnight. Higher surface area grades reliably build and maintain microporous structures throughout the matrix, trapping resin and solvent in suspension for longer shelf life. This comes at a cost to initial dispersibility—materials like AEROSIL 380 can be trickier to wet out if you are not using high-shear mixing, but once properly dispersed, they give a level of anti-sagging and anti-sedimentation impossible for lower grades.
Another real-world difference appears in matting applications. Higher surface area fumed silica causes more pronounced light scattering, producing a velvety or silky finish in clear or tinted systems. Ink formulators relying on matting with minimal haze have often found lower-area grades too weak or too prone to settling, while 300 and 380 remain suspended, producing the needed optical effect.
We have always worked closely with formulators who struggle with highly filled or high-performance systems. For example, automotive clearcoats have stringent viscosity and sag resistance requirements; adhesives often face separation or stringiness; silicone sealants must stand up to storage, dispensing, and weathering. Over the years, our technical team has been called upon to troubleshoot gelation rates, clarify compounding flows, and recommend grades for tricky formulations.
We have learned not to push any product where it does not belong. Some lower surface area grades cost less and disperse easier or produce lower viscosity at equal loading. But where the application demands controlled thixotropy—easy spreading under shear, fast recovery after application, and long shelf life—AEROSIL 300 or 380 delivers unique benefits. With our own production under one roof, we know exactly what each bag contains and exactly how each grade performs under mixing, shearing, thawing, or hot storage.
Many customers ask about the differences between AEROSIL 300 and AEROSIL 380 in familiar end products. From our direct work in paints, coatings, inks, adhesives, greases, cable gels, and more, the main distinctions revolve around handling depth and batch size.
In solvent-borne coatings, higher area grades like AEROSIL 380 can deliver premium anti-settling and anti-sagging even at very low percentages, letting formulators reach specified application viscosity while minimizing additive content. In high-speed roll coatings or gravure print applications, these grades keep pigments or effects particles suspended for consistent laydown and appearance. Quite a few ink makers rely on the unique surface activity of AEROSIL 300 for scratch resistance and gloss control, while specialty adhesives and sealants use 380 to maintain storage stability or regulate flow properties in both filled and unfilled systems.
Over the past decade, we have watched the electronics sector steadily increase its reliance on fumed silica. Potting compounds, heat conductive greases, encapsulants, and specialty dielectric gels all respond differently to subtle shifts in silica properties. AEROSIL 300 often wins out for balance and ease of dispersion, while those pushing the boundaries of thixotropy and structure-building—especially in challenging silicone matrices—prefer AEROSIL 380.
Handling fumed silica in a manufacturing setting takes more than just knowing part numbers or technical data. Our plant teams regularly handle shipments upwards of several tons per month; we are accustomed to managing dust, humidity, static build-up, and feed timing. Material consistency means operators know what to expect from each bag—free-flowing materials that pour evenly, not prone to rapid caking, consistent performance with both manual and automated additions.
We routinely help customers troubleshoot mixing and compounding issues unique to these high-surface-area grades. Puffs of airborne dust, incomplete dispersion, local gelling, and apparent "lumps" all trace their origin back to handling technique or process design. We have tweaked dozens of compounding setups, helping production engineers implement staged addition, pre-wetting, or high-shear mixing as needed. Our ability to reproduce specific dispersions and track additives back to production batches keeps line stoppages and batch failures to a minimum.
No two production environments are the same. From firsthand experience, customers tend to reach for AEROSIL 300 when looking for all-around thickening or structure without excessive impact on mixing or flow. This grade settles into most resins with less initial increase in viscosity, so it tends to behave better in process lines where temperature, mixing energy, or shear force is at a premium. It’s most often chosen as the backbone in universal thickeners, flow modifiers, stabilizers, or matting agents.
AEROSIL 380, with its extra surface activity and smaller aggregate clusters, brings higher performance where systems are thin, clear, and particularly prone to sediment and settling. This level of surface extension improves anti-sagging properties in lightweight filler systems or high-gloss paints where appearance must survive weeks or months on the shelf. High electrical insulators, specialty gels, and filled silicone elastomers gain increased consistency and improved processability from the higher structure and oil absorption.
Neither grade is a magic bullet—those who try to substitute 300 with 380 on an equal mass basis can find themselves surprised by rapid thickening or handling difficulties. Our job is to guide customers based on actual raw material supply, mixing technology, end use, and required shelf life. We welcome requests for sample quantities, batch data, and full-scale production advice.
We control every aspect of AEROSIL production from incoming chlorosilane checks, through flame reactor optimization, aggregate separation, and dust collection, to final drying and packing. This matters for technical and safety reasons. Trace contaminants, residual chloride, and batch-to-batch shifts in pH can derail production or stress final specification compliance. With years of investment in filtration, gas scrubbers, surface modification steps, and analytics, we hold ourselves accountable for each lot. Our recordkeeping and traceability systems enable rapid response if ever a problem arises downstream—no finger-pointing at a distant supplier or mystery broker.
We see frequent disruptions in the supply chain—unexpected substitutions, variable product lots, inconsistency in particle properties, and swings in availability. Our long-term customer partners trust us for predictability and transparency. It comes down to being manufacturers, not traders, so we are here to answer detailed technical questions, provide composition data, and liaise directly with regulatory teams.
Experience on the factory floor reveals improvements that cannot be predicted from the laboratory alone. Over the decades, our team has integrated lessons learned from customer complaints, failed product lines, and even material recalls. Changes to site ventilation, use of advanced filter systems, operator safety, dust containment protocols, and innovative post-processing all feed back into the next batch of AEROSIL 300 or 380.
We welcome open discussions of technical problems in the field—gelling, haze, air entrapment, inconsistent viscosity, or incompatibility with certain resin or plasticizer systems. If an issue can be traced to particle structure, surface modification, or aggregate distribution, our team documents and addresses it internally. We invite users to submit feedback after every trial or production run, so our process engineers can correlate performance shifts with specific batch signatures or machine maintenance cycles. In our view, anything less is a recipe for stagnation or avoidable errors.
We have invested heavily in emission controls, personal protective equipment, operator safety training, and waste management programs. Fumed silica is notoriously difficult to handle in large quantities, and we draw from years of operational experience to maintain clean working environments and robust process containment.
Internal studies and decades of occupational exposure data indicate that good air handling and proper PPE can keep workplace dust levels well within regulatory limits. Our technical files, safety audits, and annual reviews ensure we meet or exceed industry standards. Our management system extends not just to the protection of our own workers but to providing accurate, up-to-date safety and handling guidance for all downstream users. We have kept pace with changes in REACH, US EPA, and Asian regulatory requirements through certification and direct engagement with auditing bodies.
Down the years, countless R&D departments have sent us unusual requests—custom particle sizes, specific surface modifications, special packaging, and novel compounding strategies. Because we own our reactors and operate our own R&D annex, we regularly adapt our AEROSIL grades to new industry needs. Several high-tech ceramics, battery pastes, fuel cell membranes, and flexible electronics projects started with long phone calls and joint pilot runs.
Through all this, we have learned that direct collaboration speeds up problem-solving. The rise of bio-based systems, solvent-free coatings, and next-generation elastomers has reinforced the importance of custom matching silica structure to system rheology. Our specialty lies not just in fumed silica manufacturing but in working step-by-step with the engineers and scientists developing the final applications. These partnerships foster breakthroughs and lead to new hybrids, composites, and process improvements extending the value of AEROSIL 300 and 380 beyond traditional uses.
From lab-scale lots to full-scale tank trucks, every batch of AEROSIL passing through our gates is the product of tight process discipline, responsive management, and pride in manufacturing. We never distance ourselves from the end user—whether that means fielding emergency troubleshooting calls in the middle of a major production run, collaborating on next-generation products, or bringing a new R&D chemist up to speed on silica handling. These relationships go beyond the transactional; they are grounded in shared challenges and practical solutions.
Our team maintains regular training sessions, participates in industry roundtables, and produces technical papers grounded in hands-on findings, not just literature reviews. We believe sharing experience, data, and failures builds a stronger foundation for everyone involved. We are always happy to arrange technical visits, collaborative tests, or process audits to help customers optimize AEROSIL 300 or AEROSIL 380 in their operations. Our doors, and our phone lines, remain open to questions, new ideas, or feedback.
Manufacturing fumed silica isn't simply about churning out powder; it is about matching customer needs with technical capability, staying ahead in process control, and solving problems at both the bench and plant level. We stake our name on AEROSIL 300 and 380, not just for the numbers on a technical sheet but for the track record in the hands of real-world users—formulators, compounders, line managers, and R&D teams facing real deadlines and demanding applications.
Long experience has shown that the best performing coatings, sealants, adhesives, and advanced materials are built through genuine collaboration between manufacturer and end user. At our facility, we hold ourselves accountable for each grain of AEROSIL that leaves the line. Years of incremental improvements, close feedback cycles, and honest technical support mean that whether you’re working with AEROSIL 300, AEROSIL 380, or exploring new product frontiers, you have a genuine partner rooted in the hands-on world of specialty chemicals. We have seen what works and what doesn’t, and we stand ready to put that expertise to work alongside you.
