Hydrophilic Fumed Silica

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Alfa Chemistry is a highly trusted provider specializing in the research, development, and production of organic silicon materials. We offer a diverse range of hydrophilic fumed silica products with varying surface areas. Manufactured through the hydrolysis of volatile chlorosilanes in a hydrogen-oxygen flame, our high-purity hydrophilic fumed silica is easily wetted by water and disperses well in aqueous systems. And chemically speaking, this loose white powder consists of highly pure amorphous silica. With outstanding thermal stability, chemical resistance, and thixotropic properties, these materials are widely utilized in adhesives, sealants, silicone elastomers, coatings, inks, composites, personal care products, and fire extinguishing systems.

Our Products

Catalog	ALOS-HFS-001	ALOS-HFS-002	ALOS-HFS-003	ALOS-HFS-004
CAS No.	112945-52-5 or 7631-86-9
Specific Surface Area (BET)	150±15 m²/g	200±15 m²/g	300±15 m²/g	380±15 m²/g
Average Primary Particle Size	5-40 nm	5-40 nm	5-40 nm	5-40 nm
SiO₂ Content, wt.% (1000 °C, 2h)	>99.8%	>99.8%	>99.8%	>99.8%
Loss on Drying, wt.% (105 °C, 2h)	<1.0%	<2.0%	<2.0%	<2.5%
Ignition Loss, wt.% (1000 °C, 2h)	<1.0%	<2.0%	<2.0%	<2.0%
pH Value (in 4 % aqueous dispersion)	3.6-4.3	3.6-4.3	3.6-4.3	3.6-4.3
Tamped Density	About 50 g/L	About 50 g/L	About 50 g/L	About 50 g/L

Applications

ALOS-HFS-001	It can serve as a thickening and thixotropic agent for silicone sealants. It can function as a reinforcing silicone filler in elastomers, particularly in silicone elastomers.
ALOS-HFS-002	It can serve as a free-flow additive in the manufacturing of technical powders, as well as in food, feed, and silicone pharmaceutical products. It can be used as a thickening and thixotropic agent in various organic systems, such as unsaturated polyesters, coatings, printing inks, adhesives, cosmetics, and more. It is employed as a reinforcing filler in elastomers, primarily in silicone elastomers.
ALOS-HFS-003	It can be utilized as a thickening and thixotropic agent in various organic systems, such as unsaturated polyesters, coatings, printing inks, and silicone adhesives and sealants. It serves as a reinforcing filler for HTV (high-temperature vulcanized rubber) and LSR (liquid silicone rubber) while maintaining a high level of transparency.
ALOS-HFS-004	It can serve as a thickening and thixotropic agent in a variety of organic systems, such as unsaturated polyesters, coatings, printing inks, adhesives, and more, particularly when high gloss and transparency are desired. It can act as a reinforcing filler in elastomers, primarily silicone elastomers. It can be utilized as a free-flowing silicone additive in the manufacturing of powdered substances and food products.

Packaging

Available in 10 kg bags. Customized packaging can be arranged based on customer requirements.

Storage and Shelf Life

Store the product in a cool, dry place in sealed packaging. The shelf life is 24 months under proper storage conditions.

If you can't find the specific product you're looking for, we are happy to provide customized solutions tailored to your requirements. Our expert team is dedicated to working closely with you to develop the perfect product that fits your unique application.

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