Bostik Chem-Calk 300

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Description for Bostik Chem-Calk 300

One-component architectural grade sealant; properties remain stable in severe weather and temperature changes.

Application Type	Bond, Seal, Gaskets
1 Part or 2 Part	1 Part
Material Form	Paste
Substrate	Neoprene, Porous substrates, Butyl rubber
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

Best Practices for Bostik Chem-Calk 300

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Surface Preparation

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.
Curing

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.
Clean-Up

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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Technical Data

Overview

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Specifications

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Best Practices

*See Terms of Use Below
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Bostik Chem-Calk 300

Description for Bostik Chem-Calk 300

Best Practices for Bostik Chem-Calk 300

Surface Preparation

Curing