• Description for Bostik 915

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

    *See Terms of Use Below

    Application Type Bond, Seal
    1 Part or 2 Part 1-Part
    Material Form Paste
    Substrate Ceramic, Copper, Kynar® coated metals, Steel, Fiber cement board, Wood, Foam, Most other metals, Stone
    Industry Perimeters of windows, Perimeters of doors
    Manufacturer Bostik
    Chemistry Polyurethane
    Cure Method Moisture
    Viscosity (cPs) Non-Sag, Slump
    Color Black, Almond, Hunter Green, Limestone, Terra Cotta, White, Bronze, Medium Bronze, Stone, Medium Bronze, Tan, Terra Cotta
    High Temperature Resistance (°C) 66
    Low Temperature Resistance (°C) -40
    Durability Tough
  • Technical Data for Bostik 915

    • Application Type
    • 1 Part or 2 Part
      • 1-Part
    • Material Form
      • Paste
    • Substrate
    • Industry
      • Industrial - Concrete panels, Control joints, Sealing expansion, Sealing roofing, Siding, Wall penetrations, Tilt up joints, Many roofing applications, Metal roofs, Gutters, Roof tile installations, Flashing applications, Sheet metal applications
      • Construction - Masonry
      • Construction Window - Perimeters of windows
      • Construction Door - Perimeters of doors
    • Chemistry
    • Application Method
      • Dispenser - Professional caulking gun
      • Flow
    • Cure Method
      • Moisture / Condensation Cure - Moisture
    • Color
      • Black
      • Brown - Almond, Medium Bronze, Tan, Terra Cotta
      • Gray - Stone
      • Green - Hunter Green
      • Off-White - Limestone
      • Red - Terra Cotta
      • White
      • Yellow - Bronze, Medium Bronze
    Cure Specs
    Viscosity (cPs) Non-Sag, Slump
    Bond Strength
    General Bond Strength (psi) Tenacious sealing
    Peel Strength (piw) >5 Test Method
    Tensile Strength (psi) 133 Test Method
    Material Resistance
    UV Resistance Pass Test Method
    High Temperature Resistance (°C) 66
    Low Temperature Resistance (°C) -40
    Durability Tough
    Shore A Hardness 42 Test Method
    Elongation (%) 685 Test Method
    Flexibility Flexible, Elastomeric
    Modulus (psi) 65, 45 Test Method
    Business Information
    Shelf Life Details Store in a clean, dry area not affected by freezing or hot temperatures between 50°F (10°C) and 90°F (32°C). Shelf life is one year from date of manufacturing in unopened cartridge.
    Shelf Life Temperature (°F) 50 to 90
    Shelf Life Type From date of manufacturing
    Shelf Life (mon) 12
  • Best Practices for Bostik 915

    *See Terms of Use Below

    1. 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.)

    2. Curing

      Bostik® Chem-Calk® 915 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 one 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.

      Dampness and substrates with high moisture content will trigger extensive curing of the sealant within a very short period of time. This may cause an excess of bubbling and foaming within the sealant and at the bottom of the bead.

    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).

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
Cure Time Test Methods
Cure Time Test Method
Tack Free Time Test Methods
Tack Free Time Test Method
Work / Pot Time Test Methods
Work / Pot Time Test Method
Peel Strength Test Methods
Peel Strength Cure Time Cure Temperature Cure Humidity Test Method
>5 piw >20,160 min 25°C 50 % TT-S-00230C / ASTM C 794, After 14 days cure at 77°F and 50% RH
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature Cure Humidity Test Method
133 psi >20,160 min 25°C 50 % @ Break, ASTM D 412, After 14 days cure at 77°F and 50% RH
UV Resistance Test Methods
UV Resistance Test Method
Pass ASTM C 793
Elongation Test Methods
Elongation Test Method
685 % ASTM D 412, at Break, After 14 days cure at 77°F and 50% RH
Modulus Test Methods
Modulus Test Method
65 psi @ 100% Elongation, ASTM D 412, After 14 days cure at 77°F and 50% RH
45 psi @ 25% Elongation, ASTM D 412, After 14 days cure at 77°F and 50% RH
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
42 ASTM D 2240, After 14 days cure at 77°F and 50% RH 25°C