Childers® CP-137 Protective Coating

• CP-137 coating is non-flammable in the wet state and fire resistive when dry.
• It contains no solvents to attack insulations or facings.
• The viscosity permits overhead and vertical applications that do not sag or run for additional ease of application.
• The combination of properties afforded by this material gives it great versatility both as an adhesive and a coating.
• The polymeric resins make this an adhesive of high bond strength.
• The tough film is washable and is abrasion resistant.

• CP-137 coating is used for adhering fabrics such as glass cloth, canvas and brattice cloth to many insulated surfaces such as round and rectangular duct work and equipment.
• It is also used for adhering the laps of these fabrics as well as some woven glass cloths on pipe insulation.
• CP-137 is used as a protective coating over all of the above mentioned fabrics and also finds use as a coating over plastic foam materials such as polystyrene.
• CP-137 coating can be brushed on the joints and edges of duct liner insulation to help prevent air erosion of the glass fiber.

Pipe Insulation, Duct Insulation and Equipment 

• All insulation finished with canvas (or other fabric finishes) shall be bonded with and have their laps adhered with CP-137 coating.
• Apply only to clean, dry, oil-free surfaces. Apply a tack coat at 60 – 70 sq. ft. per gal. (1.5 – 1.7 m2 /l).
• Immediately embed the selected lagging fabric into the wet coating.
• Smooth to avoid wrinkles and overlap seams by at least 2 inches (5 cm).
• Immediately apply a finish coat at 60 – 70 sq. ft. per gal. (1.5 – 1.7 m2 /l).
• The dry film thickness of this application will vary with the fabric selected.
• For air conditioning ducts, increase the coverage rate to 40 – 50 sq. ft. per gal. (1.0 – 1.2 m2 /l) for each coat.

Notes to Specifying Engineer

• It is recommended that in using most types of pre-sized glass cloth facings, CHIL-STIX® FRN CP-82 Adhesive be used as the lap adhesive.
• The above suggested specification is for hot piping and equipment. It may be used for equipment operating as low as 55°F (13°C) in northern climates where a material with a perm rating of 1.5 is adequate.
• If CP-137 is to be top coated with anything other than an alkyd enamel conforming to DOD-E-24607 as specified in MIL-A-3316C, the user must confirm by his/her own tests that the products are compatible and that the final results are satisfactory.

Use of Material 

• CP-137 coating brushes easily despite its somewhat heavy appearance.
• It should be stored indoors and above freezing temperatures, and should not be applied below 40°F (4°C) nor above 100°F (38°C) for best results. Stir Well, Do Not Thin.

The Condition of the Surface to Be Adhered or Coated 

• Certain surfaces which are dusty or porous such as calcium silicate or certain mineral fiber materials should first be primed with a light coat of CP-137 adhesive diluted 50% with water for proper bonding.
• A coating or adhesive will adhere no better than the integrity of the surface to which it is applied.
• Not suggested for outdoor use.

Application

• CP-137 coating is extremely easy to apply by brush and the same procedure would be used as applying latex paints or similar brush-on coatings.
• Brushes or other tools should be kept in water and cleaned with hot, soapy water.
• CP-137 coating may be sprayed with many types of equipment, including airless spray.
• It may also be sprayed with conventional mastic spray equipment using an external atomizing spray gun.
• Average viscosity range: 55,000 – 75,000 cps.
• For best results, we suggested the following airless spray equipment.

Hints for Success

• CP-137 coating is an excellent adhesive and also has good resistance to many chemicals and solvents. Spillage of this material should be cleaned immediately.

• California Dept. of Public Health Standard Method v1.2
• VOC Emissions and Content requirements to contribute to LEED v4 EQ Credit: Low Emitting Materials - Paints and Coatings
• Collaborative for High Performance Schools EQ 7.1
• Meets NFPA Standard 90A & 90B requirements
• Meets the performance requirements of MIL-A-3316C, Class 1, Grade A