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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Download Technical Data Sheet Save This Material

Gluespec Poll

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Tack Free Time Test Methods

Tack Free Time	Test Method
240 min	C679

Tensile Strength Test Methods

Tensile Strength	Cure Time	Cure Temperature	Cure Humidity	Test Method
171 psi	>10,080 min	25°C	50 %	@ Break, ASTM D 412, After 7 days cure at 77°F and 50% RH

Peel Strength Test Methods

Peel Strength	Cure Time	Cure Temperature	Cure Humidity	Test Method
>30 piw	>10,080 min	25°C	50 %	TT-S-00230C/ASTM C 794, After 7 days cure at 77°F and 50% RH

UV Resistance Test Methods

UV Resistance	Test Method
Good	ASTM C 793

Elongation Test Methods

Elongation	Test Method
5 %	ASTM D 412, at Break

Modulus Test Methods

Modulus	Test Method
140 psi	@ 100% Elongation ASTM D 412, After 7 days cure at 77°F and 50% RH

Shore A Hardness Test Methods

Shore A Hardness	Shore Hardness Test Method	Hardness Temperature
48	ASTM D 2240, After 7 days cure at 77°F and 50% RH	25°C

Bostik Chem-Calk 950

Description for Bostik Chem-Calk 950

Best Practices for Bostik Chem-Calk 950

Surface Preparation

Curing

Clean-Up

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Why register?

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Technical Data

Overview

magna dolore.

tincidunt sed.

laoreet erat.

sit.

Specifications

laoreet ut ipsum.

tincidunt diam amet dolor.

laoreet diam.

nibh.

Best Practices

ut laoreet laoreet.

ut dolore consectetuer diam amet.

sed euismod nibh.

euismod nonummy nonummy.

dolore tincidunt adipiscing dolore dolore laoreet.

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Gluespec Poll

What level of expertise do you have in specialty chemicals like adhesives, sealants, conformal coatings, etc.?

Tack Free Time Test Methods

Tensile Strength Test Methods

Peel Strength Test Methods

UV Resistance Test Methods

Elongation Test Methods

Modulus Test Methods

Shore A Hardness Test Methods

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