Dry-Cote (Sealer for Calcium Silicate Boards)

Dry-Cote is a nonionic, aqueous emulsion based on a reactive silicone fluid. It contains 60% active ingredients. It is used as a mold release agent in the metalworking industry, as well as in the rubber and plastic industries. Dry-Cotcell namenhances the water repellent characteristics of particulate and porous materials such as calcium silicate, cement composite boards, perlite, and vermiculite.

The Dry-Cote properties listed represent typical average values obtained in accordance with accepted test methods and are subject to normal manufacturing variations. They are supplied as a technical service and are subject to change without notice. Check with your supplier to assure current information


pH6 to 8
AppearanceMilky White Liquid
NatureEmulsion of Dimethylpolysiloxane Fluid
Active Ingredients ( % )60
Type of EmulsionNonionic


  • Easily diluted; it’s stability will not be affected. It may be diluted up to a concentration of 1 part Dry-Cotcell namemulsion to 200 parts water.
  • Excellent stability in either concentrated or diluted form.
  • Remarkable efficacy as a mold release agent; due to it’s fine particles, it leaves a thin, uniform film which inhibits any adherence after the evaporation of residual water. Demolded parts are left unblemished with an extremely smooth surface finish. Do not exceed 1:200 dilution.
  • Excellent waterproofing ability. For porous materials (i.e. Calcium Silicate), add 1 part Dry-Cote to 12 parts water. Mix thoroughly. Apply with a sprayer, roller, or other suitable device, taking care to completely coat the entire surface including edges.


Foundry Service and Supplies is a full-service fabricator of calcium silicate and fiber reinforced cement composite board products with an unmatched reputation for quick turn-around and competitive pricing. We have many years of experience coating our various board products with Dry-Cote, and we would be happy to provide any of our materials pre-coated to exact customer


Dry-Cote may be kept six months between 32ºF and 95ºF in it’s original, unopened container.

Health and Safety

Avoid ingestion and contact with skin and eyes. In case of contact with eyes, flush immediately with water; if irritation persists, consult a physician

Back to top