Overview
CAB-O-SIL M-5 is an untreated fumed silica with a B.E.T. surface area of 200 m²/g, amorphous X-ray form, and an assay of greater than 99.8% SiO2. As one of the recommended international brand products in our auxiliary agent range, this fumed silica is supplied with supply chain resource support for formulators sourcing rheology control and reinforcement additives across multiple industries.
Typical Properties of CAB-O-SIL M-5
- B.E.T. surface area: 200 m²/g
- pH (4% aqueous slurry): 3.7-4.3
- 325 mesh residue (44 microns): 0.02% max.
- Tamped density: 50 g/l
- Loss on heating: less than 1.5%
- Specific gravity: 2.2 g/cm³
- Weight per gallon: 18.3 lb
- Refractive index: 1.46
- X-ray form: amorphous
- Assay (% SiO2): greater than 99.8
- Oil adsorption: approximately 350 g/100 g oil
- Average particle (aggregate) length: 0.2-0.3 microns
Key Functions
- Rheology control
- Reinforcement
- Free flow
- Suspension
- Adsorbent
Applications
This fumed silica is used across a wide range of industries, including:
- Adhesives and sealants
- Coatings
- Composites
- Cosmetics
- Foods
- Inks
- Pharmaceuticals
These applications span our Adhesives and Paints & Coatings industry categories, where consistent rheology control supports application properties such as sag resistance, anti-settling, and thickening across the formulation.
Why Fumed Silica Rheology Control Matters
Untreated fumed silica particles carry surface silanol groups that form hydrogen bonds with each other and with polar components in a liquid system, building a loose three-dimensional network that increases viscosity at low shear and thins under mechanical agitation. This shear-thinning behavior is why this additive is effective for sag resistance on vertical surfaces and anti-settling in suspensions, while still allowing the finished formulation to flow, spray, or pump normally once shear is applied. The high surface area and small aggregate size also contribute to its reinforcement and free-flow functions, since more surface area is available to interact with the surrounding matrix or to prevent powder caking. Formulators should always confirm dosage and dispersion method against the current technical data sheet, since rheological performance is sensitive to how thoroughly the silica is incorporated into the base system.
Where to Source This Product
Thousands Chemicals connects coating formulators, adhesive producers, and composite manufacturers with this fumed silica and related auxiliary agent products through our digital B2B marketplace. Our team can help confirm packaging, lead times, and technical documentation for your target application and order volume.
FAQ
What is CAB-O-SIL M-5 used for?
It is an untreated fumed silica used for rheology control, reinforcement, free flow, suspension, and as an adsorbent across adhesives, coatings, composites, cosmetics, foods, inks, and pharmaceuticals.
What is the surface area of this fumed silica?
It has a B.E.T. surface area of 200 m²/g, with an average particle (aggregate) length of 0.2-0.3 microns.
How does this additive control rheology?
Its silanol surface groups form a hydrogen-bonded network that increases viscosity at rest and thins under shear, supporting sag resistance and anti-settling properties in the finished formulation.
What is the purity and pH of CAB-O-SIL M-5?
It has an assay of greater than 99.8% SiO2 and a pH of 3.7-4.3 measured as a 4% aqueous slurry.
Can you provide technical documentation and bulk pricing?
Yes, technical data sheets and SDS documentation are available on request, and our team can provide bulk pricing and lead times based on your target volume and delivery location.
Get a Quote for CAB-O-SIL M-5
Contact our team for a quote, technical data sheet, or SDS for CAB-O-SIL M-5. We support bulk supply and global shipping for coating formulators, adhesive producers, and composite manufacturers.
