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Colloidal alumina for fiber bonding
Wesolok alumina binder is a high purity boehmite (aluminum oxide hydroxide) powder ready for dispersion in water at 5 to 10% concentration to give stable colloidal alumina sols for bonding refractory fiber shapes. It can be flocced onto fibers, like colloidal silica, with Westar+ flake corn starch.

Wesolok offers these advantages

Smaller Particle Size Readily Flocs to Fibers - Wesolok has a moderate cationic charge which flocs well with all starches, and works best with cationic starches like Westar+.
Withstands Higher Temperatures - High purity alumina provides for low reactivity and can be used to replace colloidal silica where greater refractoriness at use temperatures is required.
No Cristobalite - Completely cristobalite free at use temperature, eliminating a common source of thermal shrinkage and health-related concerns.
Typical Physical Properties

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Color White
Consistency Dry powder
pH (8% sol) 3.5—4.5
Average particle size (nm) 40
Concentration limit (sol)* 10%
Loss on Ignition** 7—8%
Toxicity Non-toxic. Mildly acidic (pH = 4.5) See SDS.
Packaging Fiber drums, 400 lbs net, loose or 20 lb bags; cartons, 60 lbs net.
*Higher concentrations form thixotropic gels on standing
**Typical value for Wesolok bonded fiber products.

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Wilmington, DE  19801

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