Bostik 915

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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.

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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

Best Practices for Bostik 915

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Technical Data for Bostik 915

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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
- Foam
- Metal - Kynar® coated metals, Most other metals
- Copper
- Steel
- Wood
- Stone - Fiber cement board
- Other - Marble, Masonry
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
- Construction Window - Perimeters of windows
- Construction Door - Perimeters of doors
Chemistry
- Polyurethane
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

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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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).
Comparable Materials for Bostik 915

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Spec Engine^® Results
- Flex-221(Sika)
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- Flex-221 SF(Sika)
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