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, Steel, Masonary, Wood, Porous
Manufacturer	Bostik
Chemistry	Polyurethane
Cure Method	Moisture
Cure Temperature (°C)	25
Cure Time (min)	8,640
Viscosity (cPs)	Non-Sag, Pourable
Color	Limestone, Limestone, Stone
Ozone Resistance	Excellent Ozone resistance
High Temperature Resistance (°C)	66
Low Temperature Resistance (°C)	-29
Durability	Tough

Best Practices for Bostik Chem-Calk 950

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Technical Data for Bostik Chem-Calk 950

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Overview

Application Type
- Adhesive - Bond
- Sealant - Seal
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
Material Form
- Paste
Substrate
- Ceramic - Ceramics
- Porous Substrates - Porous
- Steel
- Wood
- Stone - Masonary
- Other - Marble
Industry
- Industrial - Control and perimeter joints, Malls, Sealing expansion joints
- Construction - Driveways, Factory floors, Institutional floors, Parking decks, Patios, Pavements, Plazas
Chemistry
- Polyurethane
Application Method
- Caulking gun
Cure Method
- Moisture / Condensation Cure - Moisture
Color
- Gray - Limestone, Stone
- Off-White - Limestone

Specifications

Cure Specs

Cure Temperature (°C)	25
Cure Time (min)	8,640
Viscosity (cPs)	Non-Sag, Pourable
Tack Free Time (min)	240	Test Method
Work / Pot Time (min)	110

Bond Strength

Peel Strength (piw)	>30	Test Method
Tensile Strength (psi)	171	Test Method

Material Resistance

Ozone Resistance	Excellent Ozone resistance
UV Resistance	Good	Test Method
High Temperature Resistance (°C)	66
Low Temperature Resistance (°C)	-29

Hardness

Durability	Tough
Shore A Hardness	48	Test Method
Elongation (%)	5	Test Method
Flexibility	Flexible
Modulus (psi)	140	Test Method

Business Information

Shelf Life Details	Shelf life of Bostik® Chem-Calk® 900 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. High temperature and high relative humidity may reduce significantly the shelf life of polyurethane sealants. If you are unsure of the expiration date of your Bostik product, please call customer service at 1-888-603-8556 to check if the product is still within its shelf life.

Best Practices for Bostik Chem-Calk 950

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1. 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.
2. 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.
3. 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).
Comparable Materials for Bostik Chem-Calk 950

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Spec Engine^® Results
- 1100 Fast Set Urethane Adhesive/Sealant(Bostik)
  One part urethane sealant that cures by reaction with atmospheric moisture to form a tough, flexible seal.
- 915(Bostik)
  One-component, construction grade smooth sealant capable of dynamic joint movement; properties remain stable in severe weather and temperature changes.
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