Bostik Chem-Calk 950

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Description for Bostik Chem-Calk 950

One-component, construction grade pourable sealant capable of dynamic joint movement; properties remain stable in severe weather and temperature changes.

Note: This material has been discontinued. Please view the Comparable Materials tab or call us at (262) 293-7970 for additional help.

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Application Type	Bond, Seal
1 Part or 2 Part	1 Part
Material Form	Paste
Substrate	Ceramics, Porous, Steel, Masonary, Wood
Manufacturer	Bostik
Chemistry	Polyurethane
Cure Method	Moisture
Cure Temperature (°C)	25
Cure Time (min)	8,640
Viscosity (cPs)	Pourable, Non-Sag
Color	Limestone, Limestone, Stone
Ozone Resistance	Excellent Ozone resistance
High Temperature Resistance (°C)	66
Low Temperature Resistance (°C)	-29

Best Practices for Bostik Chem-Calk 950

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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.
Curing

Bostik® Chem-Calk® 950 is a moisture cure, polyurethane sealant. On wood, with ambient air at 50% relative humidity and at 73°F, polyurethane sealants will generally skin within twenty-four hour and cure 1/16 of an inch per day. Lower temperature and lower relative humidity will significantly increase the skin time and cure time of a polyurethane sealant.
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 MSDSs provided for these solvents before use. Bostik® Hand and 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

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Comparable Materials

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Bostik Chem-Calk 950

Description for Bostik Chem-Calk 950

Best Practices for Bostik Chem-Calk 950

Surface Preparation

Curing