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HS Code |
124796 |
| Product Name | HIFULL HB-620 Hydrophobic Fumed Silica |
| Bet Surface Area | 200 m²/g |
| Appearance | white, fluffy powder |
| Primary Particle Size | 7-40 nm |
| Hydrophobicity | high |
| Ph Value | 3.5-5.5 (4% dispersion in water) |
| Loss On Drying | ≤ 0.5% (at 105°C, 2h) |
| Silanol Content | low |
| Bulk Density | 50-60 g/L |
| Sio2 Content | ≥ 99.8% |
| Carbon Content | 1.0-2.0% |
| Oil Absorption | 220-340 g/100g |
| Refractive Index | 1.46 |
| Chemical Formula | SiO2 |
| Cas Number | 68611-44-9 |
As an accredited HIFULL HB-620 Hydrophobic Fumed Silica (BET=200㎡/g) factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | The HIFULL HB-620 Hydrophobic Fumed Silica (BET=200㎡/g) is packaged in 10kg kraft paper bags with moisture-proof inner lining. |
| Container Loading (20′ FCL) | 20′ FCL container loads 2,880 kg HIFULL HB-620 Hydrophobic Fumed Silica, packed in 10kg bags, 288 bags per container. |
| Shipping | HIFULL HB-620 Hydrophobic Fumed Silica (BET=200㎡/g) is shipped in sealed, moisture-resistant bags or drums to ensure product integrity. Standard packaging is 10kg/bag or 80kg/drum. Store and transport in a cool, dry location, avoiding direct sunlight and moisture. Handle carefully to prevent dust generation and container damage. |
| Storage | HIFULL HB-620 Hydrophobic Fumed Silica (BET=200㎡/g) should be stored in a tightly sealed container, kept in a cool, dry, and well-ventilated area. Protect the material from moisture and sources of ignition. Avoid direct sunlight and strong oxidizing agents. Ensure containers are clearly labeled and handle the powder to minimize dust generation or airborne dispersion. |
| Shelf Life | HIFULL HB-620 Hydrophobic Fumed Silica has a shelf life of 24 months when stored in unopened, original packaging under dry conditions. |
Applications of HIFULL HB-620 Hydrophobic Fumed Silica (BET=200㎡/g) in Industrial ManufacturingHIFULL HB-620 Hydrophobic Fumed Silica (BET=200㎡/g) delivers advanced silica performance in specialist industrial sectors where controlled rheology, anti-settling, hydrophobicity, and improved mechanical properties are critical for product consistency and value. Below, we detail its distinct integration routes and compliance for major downstream fields. 1. Automotive Refinish and OEM Solventborne CoatingsAutomotive paint manufacturers rely on the material’s hydrophobicity to enhance anti-settling in high-solid solventborne systems, improve sprayability, and impart sag resistance without sacrificing gloss. It enters formulations designed for critical color and clear coats used by both OEM assembly lines and refinishing workshops, where consistency and defect minimization are highly scrutinized by end users and audit bodies. Industry compliance standards
Typical usage ratio
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2. Silicone Sealant and Adhesive ProductionLeading silicone sealant producers integrate hydrophobic fumed silica to thicken and reinforce moisture-cure and neutral-cure silicones, targeting higher structural strength, elastic modulus, and extrudability for building and electronics sealing. The additive enables consistent extrusion even under high humidity, and prevents oil-bleed or slumping during curing under stringent environmental tolerances. Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
3. Industrial Powder Flow Aids for Food Additive SystemsMajor food additive blenders adopt the hydrophobic silica as a powder flow agent in micro-encapsulated flavors, instant beverages, powdered dairy blends, and vitamin-mineral premixes where dampness or cohesive bridging creates caking and inconsistency in flow rates. Its low surface energy and moisture repellence ensure stable dosing during automated filling and avoid lump formation, critical for large-scale batching and packaging operations. Industry compliance standards
Typical usage ratio
Downstream process integration
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4. Unsaturated Polyester and Vinyl Ester Composite ResinsProducers of marine, sanitaryware, and automotive fiber-reinforced plastic (FRP) components employ hydrophobic silica as a key rheological additive in SMC, BMC, and hand lay-up processes, supporting sag control of vertical laminates and repairing resins. This functionality ensures distinct surface quality in complex-molded items and uniform fill in automated compression molding cycles, even with high filler loads and peroxide initiator sensitivities. Industry compliance standards
Typical usage ratio
Downstream process integration
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5. Printing Ink and UV-Curable System ManufacturingInk chemists integrate hydrophobic fumed silica to control viscosity in high-speed flexographic and gravure ink formulations, specifically in low-polarity solvent and radiation-cure matrices. The additive delivers stable anti-settling, elevates particle suspension for high-opacity colors, and suppresses misting during high-shear application – vital for press uptime and precise substrate coverage demanded by industrial label and packaging printers. Industry compliance standards
Typical usage ratio
Downstream process integration
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6. Pharmaceutical Powder Processing (Direct Compression and Granulation)Global pharmaceutical formulators use hydrophobic fumed silica as a glidant and anti-caking agent during tablet pressing and capsule filling to ensure consistent flow and avoid bridging/hopper jamming. Its hydrophobic treatment prevents water-induced degradation of sensitive APIs and supports high-speed filling lines, which demand strict content uniformity and reproducibility for batch record compliance. Industry compliance standards
Typical usage ratio
Downstream process integration
Final product types
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Competitive HIFULL HB-620 Hydrophobic Fumed Silica (BET=200㎡/g) prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615651039172 or mail to sales9@bouling-chem.com.
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Tel: +8615651039172
Email: sales9@bouling-chem.com
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We manufacture HIFULL HB-620 Hydrophobic Fumed Silica with the intent to meet the evolving challenges presented by formulation scientists, coating engineers, and manufacturers across industries. Year after year, industries shift towards advanced functional materials that give them more control over consistency, water resistance, and rheology. We designed HB-620 not just to tick boxes, but to work with you—reducing downtime, improving stability, and driving product performance where it counts.
HIFULL HB-620 utilizes fumed silica where the surface is treated to repel water. The BET surface area lands at 200㎡/g, which we have found provides a balance between thickening efficiency and dispersion stability. Through our own in-house surface treatment process, the hydrophobic characteristics are not an afterthought—they run to the core of the material, delivering repeatability you can count on, batch after batch.
Many users in adhesives or sealants grapple with issues like drop-in viscosity, phase separation, and moisture sensitivity. HB-620’s specific surface treatment allows it to sit in both polar and non-polar systems, bringing a dependable anti-sag effect even at low addition rates. For automotive coatings, silicone sealant, and protective films, HB-620 acts as a three-way performer: improving thixotropy, resisting caking under storage, and reducing humidity-driven failure. We see customers leverage it to cut out extra stabilizers, trusting its hydrophobic surface to manage unwanted moisture from the system—especially important in regions with long wet seasons or high atmospheric humidity.
During the mixing process, some hydrophilic silica grades can clump or “cake” when they touch traces of water, leading to headaches in the form of poor dispersion and wasted raw material. HB-620 overcomes that hurdle. Our production line’s strict humidity controls and proprietary methyl modification steps anchor the hydrophobicity consistently, so the powder flows and integrates more easily. As a result, compounders spend less time on dispersion and face fewer inconsistencies that cost time and money.
We recognize there are many fumed silica grades on the market—hydrophilic, hydrophobic, and even grades with tailored functionality. What sets HB-620 apart is not just the specification, but the application acumen developed over years of feedback from coatings labs, elastomer mixers, and silicone sealant producers. Hydrophilic silica typically absorbs water, which kicks up viscosity quickly in polar media but can play poorly in hydrophobic or oily formulations. HB-620, with its high BET area and tailored surface, lets formulators work in challenging systems—oil paints, greasy pastes, or even some electronics encapsulations—where humidity invites failure.
While basic hydrophobic fumed silicas exist, not every product behaves consistently in real production. We’ve heard from compounders who struggled with inconsistent anti-settling properties batch-to-batch with imported silicas. We designed HB-620 to beat those inconsistencies by locking in a ratio of methyl siloxane groups to keep surfaces water-repellent. Not every hydrophobic silica you can buy at 200㎡/g ensures that level of chemical uniformity; we test each lot, not just for surface area, but for the depth and completeness of surface functionalization. This commitment reduces surprise failures in the final system—making rework and process changes a thing of the past.
Formulators in paints and coatings, sealants, adhesives, and grease-laden lubricants know well the importance of controlling thixotropy and moisture resistance. In these fields, HB-620 has not just been adopted; it’s been asked for by name. One reason: thickening power aligns with typical hydrophobic fumed silicas at a similar BET, but users find it easier to wet-out and blend into both silicone and hydrocarbon carriers, elevating the reliability of viscosity over time.
In silane-modified polymer adhesives, HB-620 suppresses unwanted water uptake that could reduce adhesion and set-time. In cable gels and electrical encapsulants, engineers use it to control bleed and ensure encapsulations stay watertight, even with intermittent exposure to weather. The anti-settling behavior in high-viscosity oils, especially in synthetic lubricants, extends product shelf life and reduces costly customer complaints over phase separation or oil weep.
Formulators in the personal care field sometimes turn to HB-620 for its unique flow-modifying effects in oily or anhydrous creams. Some cosmetic brands find that, compared with traditional fumed silica, HB-620 delivers the expected texture without thickening too aggressively in the presence of minor water content. This flexibility opens new doors in formulating non-traditional beauty balms, sunblocks, and pigmented balms—where users demand stability across various climates and environments.
Those of us involved in the day-to-day production know that successful use of fumed silica depends on more than just purity or particle size. It comes down to knowing what will happen on your mixer floor, during storage, and in the hands of end customers. Over the years, in-house batch blenders struggled with hydrophilic silica caking or ‘lumping’ under fluctuating humidity. This sometimes stressed pneumatic conveying systems and created unsafe conditions—clogging hoses and creating airborne dust. Once customers switched to HB-620, reports of clumping issues dropped dramatically, and powder transfer became faster, safer, and less prone to unplanned shutdowns.
For operators, the dry flow of HB-620 means quicker metering, less bridging in hoppers, and a cleaner environment downstream. In polyurethane foam or sealant lines, line managers observed denser, more stable dispersions, reducing the skinning problems sometimes seen with less uniformly hydrophobic silicas. One overlooked benefit: reduced static build-up and dusting during handling, attributed to the way the treated surface interactions differ from hydrophilic grades. We have data from our process engineers confirming lower loss-on-drying and consistent particle flow under typical plant air conditions.
Quality and environmental compliance stand at the core of chemical manufacturing. Our entire HB-620 production route passes rigorous emissions controls to prevent fugitive dust and reduce environmental impact. Not all fumed silica producers run batch-level emissions tracking, but for us, it’s routine. We make sure our facilities capture and recycle unreacted silanes, managing both cost and environmental load.
Safe handling is non-negotiable. Our process engineers design HB-620’s workflow to minimize dust and to maximize operator comfort. In many cases, this lets customers skip extra dust suppression steps, improving workplace safety and reducing overheads. Documented reductions in airborne particulate levels support the adoption of HB-620 in health-conscious markets and production environments that face stricter worker safety standards.
Waste reduction comes, too, from our commitment to consistent moisture resistance. In facilities storing large stocks, hydrophilic fumed silica sometimes hardens or cakes, leading to disposal of unsalvageable bags. HB-620 resists these problems, making it a more sustainable pick for users with fluctuating storage conditions or long logistics routes.
Our technical team routinely works with industrial R&D teams running complex trials. In solvent-free coatings, they found HB-620’s hydrophobicity curtailed blushing and improved gloss retention after water exposure. In high-solids construction sealants, adopters noted less phase separation during cycles of high temperature and high humidity.
It’s no secret that additives like HB-620 influence more than the bottom line—they shape reputation, reduce rework, and cut downtime. The product’s consistency came up often during customer audits, with users noting lower batch-to-batch variance. This benefit alone reduced frequency of out-of-spec shipments, enhanced customer trust, and freed up operator attention for higher-value tasks. In discussions with production supervisors, faster clean-up and lower workplace dust were cited as tangible improvements after switching to HB-620.
The fumed silica marketplace remains highly competitive, with global brands promoting similar BET surface areas or broad claims of hydrophobicity. But not all products back their claims with process data and real customer experience. HB-620 answers the call for clear, documented performance in multiple environments—dry, humid, hot, or cold. Our customers stay with us because HB-620 handles process shocks better, from power outages to raw material variability.
Some suppliers chase lower cost through shortcut manufacturing, resulting in less consistent surface treatment. Our process doesn’t compromise: we track each stage, from flame hydrolysis through silane treatment and powder isolation, adjusting headspace and reagent ratios for absolute consistency. In the field, this means users receive a stable product that integrates into their formulation without sudden changes or last-minute reformulations.
Our approach to supporting users goes beyond simply shipping a bag of powder or sending a technical data sheet. We make HB-620 side-by-side with process managers who share feedback daily. Many times, customers reach out during production ramp-up, running new blends with little margin for error. We offer practical advice—when to add, how to blend, recommended equipment adjustments—based on decades of plant-level experience.
These hands-on collaborations yield lessons that trickle back into how we make HB-620. Formulators in specialized fields—such as optical encapsulants or aerospace sealants—bring us curveballs others won’t support. We respond by tuning our surface treatment, testing batches under real production rates, and ensuring every kilogram of HB-620 answers their needs for predictable, robust performance.
Long-term partnerships help us see the evolving needs of modern manufacturing, from higher automation to sustainability targets and cost-down initiatives. Each year, we refine HB-620 in response, knowing our reputation rides on every batch, every delivery, and every successful end product.
Over the years, we have seen customers squeeze more value from HB-620 by tailoring addition strategies. In high-shear dispersions, users achieve fine distribution without scorching mixers or over-shearing resins. In low-energy blending, the powder’s surface actively drives wetting, cutting down on mixing times and mitigating agglomeration.
Some R&D colleagues talk about advanced blending methods—statistical batch dosing, anti-static pneumatic feeds, or automated pre-dispersion modules—as ways to unlock further benefit from HB-620. Our technical team welcomes these challenges, adjusting raw material particle size distribution or tuning volatility in the surface treatment to match new application demands.
We hold workshops and on-site troubleshooting sessions for customers facing unusual blending or storage conditions. During these, HB-620’s robust handling characteristics and process reproducibility come to the forefront. End users report higher throughput and fewer reject batches in new formulations, especially in large-batch or continuous processes where process variability can write off entire shifts of production.
Our commitment to research and development means we never rest on the current formulation or process. We drive initiatives to upgrade raw material sourcing, improve emissions efficiency, and push the limits on surface functionalization chemistry. This investment in long-cycle innovation secures the future for HB-620, aligning with stricter regulatory changes and rising customer demands.
Regulatory standards surrounding additives in sensitive markets—cosmetics, food packaging adhesives, or electronics—are tightening. HB-620 is designed with this in mind, passing stringent in-house QC and independent lab checks before every outbound delivery. Our long-standing partnerships with industry leaders help us adapt formulations as standards shift—never sacrificing reliability or product safety.
At the end of the day, making and supplying HB-620 Hydrophobic Fumed Silica isn’t just about matching a product name and number to an order. It’s about understanding the day-to-day and the long view—supporting process engineers, operators, and scientists so they have the backing of real-world expertise, proven process control, and a product that works as hard as they do. Every innovation, every adjustment, every lot produced reflects what we learn together on the manufacturing floor, in the laboratory, and in the field.
