Hydrophobic Fumed Silica

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Alfa Chemistry is a trusted leader in the research, development, and production of organic silicon materials, offering a comprehensive portfolio of hydrophobic fumed silica products. These advanced materials are produced through a chemical reaction between hydrophilic silica and active silanes or silicone fluids, such as chlorosilanes, hexamethyldisilazane, and polydimethylsiloxane. The resulting hydrophobic fumed silica powder exhibits excellent water repellency, ensuring it remains insoluble in water. Our hydrophobic fumed silica delivers exceptional thixotropic properties in polar adhesives and sealants, including isocyanate resins, epoxy resins, silicone resins, polyurethane resins, and vinyl ester resins. Notably, it enhances the performance of silicone-based systems without excessive thickening. Additionally, its water resistance and ability to improve the flowability of powders make it invaluable for moisture-sensitive formulations. Moreover, our hydrophobic fumed silica offers superior storage stability and processability, and is widely employed as an anti-settling and anti-sagging agent for pigments, making it a versatile choice for various industrial applications.

Our Products

Catalog	ALOS-BFS-001	ALOS-BFS-002	ALOS-BFS-003	ALOS-BFS-004	ALOS-BFS-005	ALOS-BFS-006	ALOS-BFS-007	ALOS-BFS-008	ALOS-BFS-009
Description	It is a hydrophobic fumed silica treated with polydimethylsiloxane.	It is a hydrophobic fumed silica treated with DDS (Dimethyldichloro silane)	It is a hydrophobic fumed silica treated with DDS (Dimethyldichloro silane)	It is a hydrophobic fumed silica treated with HMDS (Hexamethyldisilazane)	It is a hydrophobic fumed silica treated with HMDS (Hexamethyldisilazane)	It is a hydrophobic fumed silica treated with HMDS (Hexamethyldisilazane).	It is a hydrophobic fumed silica treated with HMDS (Hexamethyldisilazane)	It is a hydrophobic fumed silica treated with HMDS (Hexamethyldisilazane).	It is a hydrophobic fumed silica treated with HMDS (Hexamethyldisilazane)
CAS No.	67762-90-7	68611-44-9	68611-44-9	68909-20-6	68909-20-6	68909-20-6	68909-20-6	68909-20-6	68909-20-6
Specific Surface Area (BET)	95-125 m²/g	100-130 m²/g	150-190 m²/g	105-135 m²/g	115±15 m²/g	140-180 m²/g	170±20 m²/g	180-240 m²/g	260±25 m²/g
SiO2 Content, wt.% (1000 °C, 2h)	Min. 99.8	Min. 99.8	Min. 99.8	Min. 99.8	Min. 99.8	Min. 99.8	Min. 99.8	Min. 99.8	Min. 99.8
Loss on Drying, wt.% (105 °C, 2h)	Max.1.5	Max. 0.7	Max. 0.7	Max. 0.5	Max.0.7	Max.0.5	Max.0.5	Max.0.5	Max.0.5
Loss on Ignition, wt.% (1000 °C, 2h)	Max.10	Max. 2.5	Max. 2.5	Max. 4.0	Max.2.0	Max.4.0	Max.4.0	Max.8.0	Max.4.0
pH Value (in 4 % aqueous dispersion)	5.5-7.5	3.7-4.5	3.7-4.5	5.5-7.5	5.5-7.5	7.0-8.5	5.5-8.0	7.0-8.5	5.5-8.0
Tamped Density, g/L (2h at 105 °C)	-	40-60	40-60	40-60	40-60	-	40-60	-	40-60
Carbon Content, wt.% (2h at 105 °C)	4.5-6.5	0.6-1.2	0.7-1.3	1.0-2.0	1.0-2.0	1.5-3.5	1.5-3.5	3.5-6.5	2.5-4.0

Applications

ALOS-BFS-001	It can serve as a thickening and thixotropic agent for silicone adhesives and sealants. It can serve as a thickening and thixotropic agent for epoxy and vinyl ester resins, gel coats, cable gels and lubricants. It serves as an anti-settling agent for fillers. It can enhance flowability of powders.
ALOS-BFS-002	It can be used in RTV silicone sealants (especially electronic potting), adhesives, silicone coatings, inks, and powder coatings.
ALOS-BFS-003	It can be used in RTV silicone sealants (especially electronic potting), adhesives, silicone coatings, inks, and powder coatings.
ALOS-BFS-004	It can be used in elastomer (such as HTV&RTV silicone rubber, SLR), adhesives, sealants, silicone coatings, printing ink, negative toners, and powder coatings.
ALOS-BFS-005	It can be used in RTV silicone sealants (especially electronic potting and liquid glue), adhesives, sealants, silicone coatings, printing ink, and powder coatings.
ALOS-BFS-006	It can be used in silicone rubber, anti-foamer, toner, silicone coatings, adhesives, and sealants.
ALOS-BFS-007	It can be used in HTV silicone rubber, silicone coatings, printing ink, adhesives, sealants, and powder coatings.
ALOS-BFS-008	It can be used in silicone rubber, silicone adhesives, sealants, anti-foamer, and toner.
ALOS-BFS-009	It can be used in carbon powder for printer, elastomer, HTV silicone rubber, LSR, coating, printing ink, and anti-foamer.

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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