Bostik Chem-Calk 950

Bostik Chem-Calk 950 Datasheet
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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.

    *See Terms of Use Below

    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) Non-Sag, Pourable
    Color Limestone, Limestone, Stone
    Ozone Resistance Excellent Ozone resistance
    High Temperature Resistance (°C) 66
    Low Temperature Resistance (°C) -29
    Durability Tough

  • Technical Data for Bostik Chem-Calk 950

    *See Terms of Use Below

    Overview
    • Application Type
    • 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
    • Application Method
      • Caulking gun
    • Cure Method
      • 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

    *See Terms of Use Below

    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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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
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