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AL2CHEM SPECIALTIES AL FS-900

AL FS-900 is hydrophilic fumed silica surface treated with dimethyldichlorosilane (DMDS) to make it hydrophobic. Fumed silica’s unique manufacturing process produces a very high purity type of silica with nano size primary particles, a fluffy white powder that is an amorphous and colloidal form of silica. These characteristics impart a wide range of benefits to formulations from thickening and reinforcement to free flow and anti-settling. In addition the treatment imparts added water repellency, corrosion resistance, as well as thickening of complex liquid systems.

Chemical Name: Silica Dimethyl Silylate

Functions: Filler, Rheology Modifier, Thickener, Water Repellent

Chemical Family: Silica

Labeling Claims: High Purity

Compatible Polymers & Resins: Unsaturated Polyester (UPE)

Technical Data Sheet

Enhanced TDS

Knowde-enriched technical product data sheet

Identification & Functionality

Chemical Family
Silica
Chemical Name
Silica Dimethyl Silylate
CASE Ingredients Functions
Rheology Modifier,
Thickener,
Water Repellent
Composite Materials Functions
Filler,
Thickener
CAS No.
68611-44-9
EC No.
271-893-4
Technologies
CASE Ingredients,
Composite Materials
Product Families
CASE Ingredients — Additives
Rheology Modifiers & Stabilizers,
Surface Modifiers
Composite Materials — Additives
Fillers & Extenders,
Thixotropes

Features & Benefits

Labeling Claims
High Purity
CASE Ingredients Features
Anti-Settling,
Corrosion Resistance,
Excellent Flow,
Improved Rheology,
Water Resistance
Materials Features
Amorphous,
Corrosion Resistant,
Free Flowing,
High Purity,
Hydrophobic,
Water Resistant

Applications & Uses

Markets
Adhesives & Sealants,
Building & Construction,
Industrial
Applications
Adhesives & Sealants — Building & Construction
Sealants & Caulks
Building & Construction — Building Materials
Sealants & Caulks
Industrial — Chemical & Industrial Manufacturing
Resin Manufacturing
Applicable Processes
Polyester Manufacturing
Compatible Polymers & Resins
Unsaturated Polyester (UPE)
Coating Type
Gelcoat
Applications
  • Adhesives and sealants - thickening and reinforcement.
  • Improves shelf-life of silicone sealants.
  • Unsaturated polyester resin and gel-coat thickening.
  • Rheology control in paints, coatings and inks.
  • Anti-settling for heavy fillers and pigment stabilization.

Properties

Physical Form
Powder,
Solid
Typical Physical Properties
ValueUnitsTest Method / Conditions
Average Primary Particle Size16nm-
BET Specific Surface Area110+/-20m²/g-
Bulk Density40 - 60g/l-
Carbon Content0.6 - 1.2wt%-
Heating Loss (at 105°C for 2 hr)max. 1.5%-
Loss on Ignition (at 1000°C for 2 hr)max. 0.01%-
pH Value (5% in water)4.0 - 5.0--
Silica Contentmin. 99.8%-

Packaging & Availability

Packaging Type
Bags,
Super Sacks
Availability

Available in 10 kg bags (10 lb and bulk bags upon special request)