Ludox Colloidal Silica (Rigidizer)

Ludox Rigidizer is a colloidal silica compound for treating surfaces of ceramic fiber products to provide a degree of surface hardness and resistance to erosion. Ludox Rigidizer is stabilized against freezing during exposure to cold, however, freezing should be avoided.


Melting Point ( ºC )0
Melting Point ( ºF )32
Surface Area ( m²/g )198 to 258
Silica Content ( % )39.0 to 41.0
pH at 25ºC/77ºF9.2 to 9.9
Weight per Gallon at 25ºC/77ºF ( lb )10.8
Boiling Point at 760 mmHg ( ºC )100
Boiling Point at 760 mmHg ( ºF )212
Specific Gravity at 25ºC/77ºF1.3
Vapor Pressure at 25ºC/77ºF ( mm g )24
Vapor Pressure at 38ºC/100ºF ( mm Hg )48
Stabilizing Counter IonSodium
Particle ChargeNegative


The datcell namere given for informational purposes only, and are not to be interpreted as product of process specifications.

Recommended Applications

LUDOX® HS-40 HS has been broadly used in the formulation of coatings, catalysts, antislips, and anti-soil treatments as well as a high temperature binder for refractory fibers, stool coatings, investment castings, etc.

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