Description

Fumes, Silica is a high-purity, amorphous silicon dioxide produced via a high-temperature pyrogenic process, resulting in an extremely fine, low-bulk-density powder. This material is critical for applications requiring a high surface area, thixotropic properties, and exceptional reinforcing capabilities. It serves as a versatile performance additive across numerous industries where control over rheology, reinforcement, and optical clarity is paramount. Key industrial users include manufacturers of silicone rubber, adhesives, coatings, and specialty composites.

Application

• Silicone Rubber Reinforcement: Acts as a primary reinforcing filler to dramatically enhance the tensile strength, tear resistance, and durability of high-performance silicone elastomers for automotive, medical, and industrial seals and gaskets.
• Adhesives & Sealants: Imparts thixotropy and anti-sag properties to prevent slump in vertical applications, while also functioning as a reinforcing agent in polysulfide, silicone, and polyurethane systems.
• Coatings & Inks: Used as a rheology modifier to control flow and leveling, improve anti-settling properties of pigments, and enhance the scratch and abrasion resistance of final films.
• Pharmaceuticals: Employed as a glidant and anti-caking agent in powder formulations to improve flowability and processing, and as a viscosity modifier in topical gels and creams.
• Food & Cosmetics: Functions as an anti-caking agent (E551) in food powders and as a thickener and absorbent in cosmetic products like foundations and lotions.
• Electronics & Potting Compounds: Provides reinforcement and thermal stability in epoxy molding compounds and electronic encapsulants, improving mechanical performance and reliability.
• Composite Materials: Enhances the mechanical properties and dimensional stability of fiber-reinforced plastics (FRP) and other polymer composites.
• Catalyst Carrier: Serves as a high-surface-area, inert support material for various catalysts in chemical synthesis processes.

Basic Information

Product Name	Fumes, Silica
CAS No.	69012-64-2
Molecular Formula	SiO₂
Molecular Weight	60.08 g/mol
Synonyms	Fumed Silica; Pyrogenic Silica; Colloidal Silicon Dioxide; Amorphous Silica; Hydrophilic Fumed Silica; Cab-O-Sil® (trade name); Aerosil® (trade name); Silicon Dioxide Fumed
EINECS	Contact for details

Quality Control

Our Fumed Silica is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for surface area, particle size, pH, and loss on drying. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters. Production can be aligned with relevant industry standards, including Food Chemical Codex (FCC) for food-grade applications and cGMP guidelines for pharmaceutical use.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); containers must be kept tightly sealed after initial opening to prevent moisture absorption, which can affect product performance.

Specification

Item	Specification
Appearance	White, fluffy powder
Identification (IR)	Conforms to standard
Assay (SiO₂)	≥ 99.8%
Surface Area (BET)	150 - 400 m²/g
Loss on Drying (105°C)	≤ 1.5%
pH (in 4% suspension)	3.6 - 4.3
Bulk Density	30 - 50 g/L
Sieve Residue (45μm)	≤ 0.05%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.