BOSTIK 940FS
Harmonization Code : 3919.10.80 | Other self-adhesive plastic rolls not exceeding 20 cm wide.
Main features
- 10-Minute Cure Cycle
- Adhesion and Mechanical Performance of Polyurethane
- Primerless Glass-to-Aluminum Bonding
Product Description
Bostik Marine 940 Fast Set Adhesive/Sealant is a one-component, rapidly moisture-curing adhesive and sealant based on Silyl Modified Polymer (SMP) technology. Designed for demanding marine environments, it combines the adhesion and mechanical performance of a polyurethane with the flexibility and UV resistance of a silicone. The solvent-free, isocyanate-free formulation provides permanent elastic bonding, excellent weatherability, fast skin formation, and strong primerless adhesion to many marine substrates for above- and below-the-waterline applications. :contentReference[oaicite:0]{index=0}
Key Features
- Fast-setting SMP adhesive with approximately 10-minute skin time and one-day cure for rapid assembly.
- Primerless adhesion to aluminum, steel, fiberglass, EPDM rubber, PVC, glass, and painted surfaces in many applications.
- Excellent UV and weather resistance with permanent elasticity from -40°C to 100°C.
- Solvent-free and isocyanate-free formulation that is paintable after skin formation and sandable after full cure.
Applications / Suitable For
- Marine bonding and sealing
- Above- and below-the-waterline applications
- Deck hardware installation
- Through-hull fittings
- Rub rails
- Porthole sealing
- Bonding aluminum, steel, fiberglass, EPDM rubber and PVC components
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Thermal Properties
Additional Information
As-Supplied / Before-Processing Properties
| Property | Value | Unit | Method / Condition |
|---|---|---|---|
| Technology | Silyl Modified Polymer (SMP) | — | One-component moisture curing |
| Work life / Open time | 15 | minutes | Typical uncured property |
| Skin time | 10 | minutes | Typical uncured property |
| Curing time | 1 | day | 77°F / 50% RH / 0.125 in. bead |
| Application temperature | 40–95 (5–35) | °F (°C) | Recommended application range |
| Green strength | 2.3 | lb-force/ft² | 0.125 in. thick, without sag |
| Shelf life | 18 months (cartridges); 12 months (sausages) | — | Stored between 40°F and 80°F (5°C to 27°C) |
After-Processing / Final-State Properties
| Property | Value | Unit | Method / Condition |
|---|---|---|---|
| Shore A hardness | 55 | Shore A | After 14 days at 77°F and 50% RH |
| Specific gravity | 1.4 | g/mL | Typical cured property |
| Tensile strength @ 100% | 400 | psi | Typical cured property |
| Tensile strength @ break | 450 | psi | Typical cured property |
| Tensile shear strength | 375 | psi | Aluminum-to-aluminum, 0.08 in. bondline |
| Elongation | 225 | % | Typical cured property |
| Temperature resistance | -40 to 212 (-40 to 100) | °F (°C) | Maintains elasticity in service |
| UV / Weather resistance | Excellent | — | Supplier classification |
| Paintability | After skin formation | — | Supplier recommendation |
| Sandability | After full cure | — | Supplier recommendation |
