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Item # LUDOX® HS-40, 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.

Specifications  · Typical Properties  · Recommended Applications


Surface Area

198 to 258 m²/g

Silica Content

39.0 to 41.0 %

pH at 25ºC/77ºF

9.2 to 9.9

Typical Properties

Weight per Gallon at 25ºC/77ºF

10.8 lb

Boiling Point at 760 mmHg

100 ºC

Melting Point

0 ºC

Specific Gravity at 25ºC/77ºF


Vapor Pressure at 25ºC/77ºF

24 mm g

Vapor Pressure at 38ºC/100ºF

48 mm Hg

Stabilizing Counter Ion


Particle Charge



The data are 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.


Data Sheet for Ludox Colloidal Silica (Rigidizer)
(PDF, 26KB)

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Foundry Service & Supplies, Inc. | Heat And Corrosion Resistant Industrial Insulation & Construction Materials