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Description for Bostik 915
One-component, construction grade smooth sealant capable of dynamic joint movement; properties remain stable in severe weather and temperature changes.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
Overview
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1 Part or 2 Part
- 1-Part
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Material Form
- Paste
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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
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Chemistry
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Application Method
- Dispenser - Professional caulking gun
- Flow
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Cure Method
- Moisture / Condensation Cure - Moisture
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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
Specifications
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 Hardness
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
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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.)
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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.
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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 |
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Cure Time Test Methods
Cure Time | Test Method |
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Tack Free Time Test Methods
Tack Free Time | Test Method |
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Work / Pot Time Test Methods
Work / Pot Time | Test Method |
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Peel Strength Test Methods
Peel Strength | Cure Time | Cure Temperature | Cure Humidity | Test Method |
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>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 |
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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 |
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Pass | ASTM C 793 |
Elongation Test Methods
Elongation | Test Method |
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685 % | ASTM D 412, at Break, After 14 days cure at 77°F and 50% RH |
Modulus Test Methods
Modulus | Test Method |
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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 |
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42 | ASTM D 2240, After 14 days cure at 77°F and 50% RH | 25°C |