Childers® Chil-Perm® WB CP-35 Vapor Retarder Coating

• Water-based for personal and environmental safety.
• Creates a smooth finish even over rough substrates.
• Resistant to many acids and alkalis for a long service life.
• Outdoor rated and UV resistant.

• It is effective on all types of thermal insulations in both cold and dual temperature service.
• As a vapor retarder coating, it is safely used to vapor seal fittings, piping and equipment insulated with mineral fiber, cellular glass, polyisocyanurate, polyurethane, polystyrene, phenolic and even open cell polyethylene foams.
• It may also be used to seal the joints of foil-faced boards and other factory, vapor-sealed, insulation materials (test before using for this application), as well as to seal punctures from pins and staples in vapor retarder facing materials.

• Easy application by trowel or brush. It is commonly applied with CHIL-GLAS® #10 Glass Fiber Reinforcing Mesh.
• See reverse side of product data sheet for complete application instructions.

• Varies with substrate and membrane.
• 4 to 6 U.S. gal./100 sq. ft. (1.6 to 2.4 l/m2)

Warm, soapy water while coating is still wet.

Suggested Specifications for Vapor Sealing Insulation on Low Temperature Equipment, Chilled Water or Refrigerated Piping and Fittings:

• The insulation on all piping, fittings, and equipment shall be vapor sealed with this coating.
• The first coat shall be a tack coat applied at a coverage rate of 2 U.S. gals./100 sq. ft.
• While still wet, a layer of this coating shall be embedded, with all seams overlapped a minimum of 2" (5.08 cm).
• A finish coat at a coverage rate of 2 U.S. gals./100 sq. ft. (0.8 l/m² ) shall be applied so that the total wet film thickness is a minimum of 0.064" (1.6 mm).
• This will provide a minimum dry film thickness of 0.038".

Notes to Specifying Engineer:

• This is white in color and should be specified where white All Service Jacketing (ASJ), canvas or other white coatings/finishings are specified on the adjoining pipe or equipment insulation.
• Do not use over copper clad wire.
• All horizontal surfaces must be sloped at least 1/2 inch per foot (4 cm/m) to assure water run-off and prevent the ponding of rain water and melting snow or ice.

Use of Material:

• It looks heavy and yet applies quite easily. Do not thin.
• Store the product in a warm and dry area. Protect from freezing until dry.
• It is essential in applying vapor retarder sealing materials that the recommended film thickness be achieved. Therefore, do not try to spread the vapor retarder coating too thin.

The Condition of the Insulation to Be Coated:

• Since Chil-Perm® WB CP-35 is an excellent vapor retarder, it should never be applied over insulation containing moisture.
• Dusty or porous substrates should first be primed with CHIL- SEAL® CP-50A MV1, diluted 50% with water for proper bonding.
• Allow the primer to thoroughly dry before overcoating with CHIL-PERM® WB CP-35 Vapor Retarder Coating.

Hints for Success:

• A vapor retarder system is no better than its weakest link. It is extremely important that where the finish terminates at an uninsulated point, the finish of Chil-Perm® WB CP-35 Vapor Retarder Coating and glass fiber reinforcing mesh be flashed over the uninsulated section for a minimum of 4” (10.16 cm).
• Where there is a possibility of the temperature of the uninsulated section exceeding 190°F (88°C) due to steam-off or other heated application, the vapor sealing at this joint shall be accomplished by using CHIL-BYL® CP-76 Joint Sealant.
• The surface of extruded polystyrene and polyisocyanurate boardstock may contain water-soluble inks that may bleed through water-based mastics.
• Please test before applying Chil-Perm® WB CP-35 Vapor Retarder Coating.

Spray:

• CP-35 Vapor Retarder Coating may be airless spray applied.
• For spray equipment information, please consult Airless Spray Recommendations or contact your spray equipment supplier.
• Average viscosity range: 150,000 – 175,000 cps. Corrosion resistant pumps and fittings are suggested.

¹ - Temperature to which dry film is subjected.

² - Temperature, humidity and film thickness will affect drying time

³ - Varies with substrate and membrane.

⁴ - Tested as applied in a 3 in. strip at a rate of 25 sq. ft./U.S. gal.

⁵ - Tested with reinforcing mesh

• Flame Spread: 0
• Smoke Developed: 0
• Tested as applied in a 3 in. strip at a rate of 25 sq. ft./U.S. gal.