Application Type Bond, Seal, Gaskets 1 Part or 2 Part 1 Part Material Form Paste Substrate Neoprene, Porous substrates, Butyl rubber Industry Door jambs Manufacturer Bostik Chemistry Butyl Rubber Cure Method Solvent Color Black, Gray, White, Bronze Key Specifications ASTM (American Standard Test Method): ASTM C-1085; ASTM C 1311, CAN/CGSB (Canadian General Standards Board): CGSB 19-GP-14M, TT (U.S. Federal Specification): TT-S-001657
Technical Data for Bostik Chem-Calk 300
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
- Porous Substrates
- Butyl Rubber
- Other - Butyl Rubber
- Dispenser - Gun
- Yellow - Bronze
- ASTM (American Standard Test Method): C 1311 - ASTM C-1085; ASTM C 1311
- ASTM (American Standard Test Method): C-1085 - ASTM C-1085; ASTM C 1311
- CAN/CGSB (Canadian General Standards Board): 19-GP-14M - CGSB 19-GP-14M
- TT (U.S. Federal Specification): S-001657 - TT-S-001657
Work / Pot Time (min) Long
Shore A Hardness Pass Test Method
Shelf Life Details Shelf life of Chem-Calk® 300 must be checked prior to using the product; do not use past its shelf life. Caulk past its shelf life may not perform or adhere as described by this data sheet.
Not Good For
Don't Use For narrow joints, fillet joints and face nail holes., over joints is not recommended., sealing horizontal joints or traffic-bearing joints, Bad Applications
Best Practices for Bostik Chem-Calk 300
See limitations about surface preparation. Surfaces must be structurally clean, dry (no frost) and structurally sound, free of contaminants, including, but not limited to, dust, dirt, loose particles, tar, asphalt, rust, mill oil, etc. If substrate is painted or coated, scrape away all loose and weakly bonded paint or coating. Any paint or coating that cannot be removed must be tested to verify adhesion of the sealant or to determine the appropriate surface preparation if needed. (See ASP section on next page for details.) To remove laitance and any other loose material, clean concrete, stone or other masonry materials with nonalcoholic-based solvent by washing, grinding, sandblasting or wire brushing as necessary . Do not use water to clean substrates. Dust must be thoroughly removed after cleaning. Backer Rods and Bond Breaker Tapes: Bond breakers, including, but not limited to, closed-cell polyethylene backer rods, are used to control depth of the sealant bead, provide a firm tooling surface and avoid three-sided adhesion. Where the depth of joint prevents use of backer rods, a polyethylene strip or tape must be used as a bond breaker to prevent 3-sided adhesion. Do not prime or damage the surface of the bond breaker. Refer to instructions given by rod and tape manufacturers for the correct backer rod and tape size related to joint size.
Chem-Calk® 300 is a butyl rubber sealant. It relies on the evaporation of solvents to reach its cured, performance state. Skin and cure times vary relative to ambient conditions.
After dry-wiping uncured sealant from substrates and tools, remaining uncured sealant can be removed by using Xylene, Toluene or similar aromatic solvents. Please refer to the MSDS’s provided for these solvents before use. Bostik® Hand & Tool towels can also remove uncured sealant. Cured sealant is usually very difficult to remove without altering or damaging the surface to which the sealant has been misapplied. Cured sealant can be removed by abrasion or other mechanical means (scrapers, putty knives).
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