Childers® Chil-Byl® CP-76 Sealant

• Chil-Byl® CP-76 Sealant  is used to vapor seal the joints of cellular glass and cellular plastic insulations (except polystyrene).
• It remains flexible and functional through a wide temperature range.
• Chil-Byl® CP-76 Sealant has good resistance to elevated temperatures, and is recommended as an expansion joint material up to 300°F.
• It is an excellent water seal, vapor seal and expansion joint material and is suggested as a joint sealant for metal jacketing systems.
• Chil-Byl® CP-76 Sealant is applied with pointed trowel, putty knife or power extrusion equipment.
• It is also available in caulking tubes and may be applied with hand or power caulking guns.
• It has a heavy body and can be applied in various thicknesses without sagging or running.
• Chil-Byl® CP-76 Sealant resists the effects of water soak, high temperatures, vibration stresses and combinations of all three.
• It has extremely low shrinkage, excellent adhesion and requires no mixing or additives.

Joint Sealant for Cellular Glass or Cellular Plastic Insulations (Except Polystyrene)

• During application of insulation, apply a 1/8” (0.31 cm) thickness of CHIL-BYL® CP-76 sealant to the longitudinal and abutting joints.
• Sections of insulation shall be pressed firmly into place to ensure an unbroken seal. A 1” minimum depth of sealant is recommended.
• At termination of insulation, the Chil-Byl® CP-76 Sealant shall be extended back under the insulation for a minimum of 4” (10.16 cm).

Joint Sealant for Metal Jacketing Systems

• All joints of aluminum or stainless steel jacketing shall be weather sealed by applying a 1/8” (0.31 cm) bead of Chil-Byl® CP-76 Sealant underneath the lap.
• Jacketing shall be firmly embedded and pulled up tight.
• All overflow of sealant shall be removed with solvents.
• Flashing
• Chil-Byl® CP-76 Sealant shall be applied over the adjoining surfaces a minimum of 2” (5.08 cm) and flashed a minimum of 2” (5.08 cm) in each direction.
• A membrane of CHIL-GLAS® #10 shall be embedded into the flashing compound and the minimum dry flashing thickness at all points shall be 1/8” (3 mm).

Notes to Specifying Engineer

• When using a solvent-based, vapor barrier coating system such as ENCACEL® or CHIL-PERM® CP-30LO, the joint sealant to be used shall be CHIL-BYL® CP-76.
• CHIL-JOINT® CP-70 shall not be used for this application.
• Pressurized piping made from copper and aluminum alloys may be susceptible to under insulation corrosion when moisture is present and in direct contact with many materials.
• When used as a joint sealant, direct contact between pressurized pipes made from these metals and the sealant should be prevented.

Use of Material 

• Although Chil-Byl® CP-76 Sealant may be used at very low temperatures, it is recommended that it be kept as warm as possible (preferably stored at 70°F or 21°C) just prior to application for optimum ease of application.

Condition of the Surface to Be Coated

• The surface to be coated shall be as clean and dry as possible.
• No primer is required over metal surfaces, however Chil-Byl® CP-76 Sealant should not be applied over dusty, wet, damp or icy surfaces, as adhesion may be adversely affected.

Application

• Chil-Byl® CP-76 Sealant is usually applied with a steel trowel.
• There is power extrusion equipment available for production applications.
• When using the caulking tubes and laying down a bead in the joints of block insulation or pipe insulation, sufficient material should be applied so that when the joints are squeezed together a minimum of 1/16” film is formed.
• When the joints of insulation are squeezed together, any excess of Chil-Byl® CP-76 Sealant should be removed or smoothed down flush with the insulation surface.
• Spillage or overflow of Chil-Byl® CP-76 Sealant may be readily removed with almost any type of hydrocarbon solvent (caution must be exercised to ensure that the solvent used will not attack the underlying insulation and/or substrate).
• Although Chil-Byl® CP-76 Sealant may be coated over with most types of coatings, user should verify by his own tests that there will be no bleeding through the top coating by the Chil-Byl® CP-76 Sealant.

¹ - FOR JOINT: 1” x 1/16” = 308 linear ft. per U.S. Gal. (2.5 cm x 0.15 cm = 24 m/liter) , 1/8” bead = 125 lineal ft. per 10.5 fl. oz. tube (3.2 mm bead = 38 m per 0.31 I tube)

² - Surface: Inorganic reinforced cement board, Total Coverage: 32 sq. ft./gal., 2” wide strip

Certified

• Meets NFPA Standard 90A and 90B 25/50 requirements.
• This product has been tested according to ASTM E84 (Surface Burning Characteristics of Building Materials).
• Meets requirements for LEED IEQ 4.1 Low-Emitting Materials, Adhesives and Sealants when used as a butt joint sealant in insulated systems.