BOSTIK STR350A
Harmonization Code : 3919.10.80 | Other self-adhesive plastic rolls not exceeding 20 cm wide.
Main features
- Elastic Adhesive/Sealant Performance
- -40 to 121 deg C Service
- Primerless Multi-Substrate Adhesion
Product Description
Bostik STR350A is a one-component, moisture-curing adhesive and sealant based on Silyl Modified Polymer (SMP) technology. Developed as a balanced solution for both bonding and sealing, it forms permanently elastic construction joints while providing strong adhesion to a wide range of industrial substrates. The solvent-, isocyanate-, and PVC-free formulation offers excellent UV and weather resistance, neutral odorless curing, and primerless adhesion to many metals, glass, PVC, polyester (GRP), and painted surfaces for transportation and general industrial assembly applications. :contentReference[oaicite:0]{index=0}
Key Features
- Multipurpose SMP adhesive and sealant providing an effective balance between structural bonding and elastic sealing.
- Primerless adhesion to aluminum, stainless steel, galvanized steel, zinc, copper, brass, glass, PVC, polyester (GRP), and painted surfaces under supported conditions.
- Excellent UV resistance and aging properties with permanent elasticity over a service temperature range of -40°C to 121°C.
- Solvent-, isocyanate-, and PVC-free with neutral, odorless moisture curing.
Applications / Suitable For
- General industrial bonding
- Panel assembly
- Bus, caravan, and trailer construction
- Elastic construction joints
- Industrial sealing applications
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Thermal Properties
Additional Information
As-Supplied / Before-Processing Properties
| Property | Value | Unit | Method / Condition |
|---|---|---|---|
| Product type | One-component Silyl Modified Polymer (SMP) adhesive/sealant | — | Moisture curing |
| Specific gravity | 1.5 | g/mL | Typical value |
| Skin-forming time | 15 | minutes | 70°F (20°C), 50% RH |
| Open time | 20 | minutes | 70°F (20°C), 50% RH |
| Curing speed after 24 hours | 2 | mm | 70°F (20°C), 50% RH |
| Green strength | 800 | Pa | Physica Rheometer MC100 |
| Application temperature | 5–35 (41–95) | °C (°F) | Recommended application range |
| Solvent content | 0 | % | Supplier value |
| Isocyanate content | 0 | % | Supplier value |
| Shelf life | 12 months | — | Original unopened container at 5–35°C (41–95°F) |
After-Processing / Final-State Properties
| Property | Value | Unit | Method / Condition |
|---|---|---|---|
| Shore A hardness | 50 | Shore A | DIN 53505 |
| Volume change | <3 | % | DIN 52451 |
| Tensile stress (100% elongation) | 375 | psi | DIN 53504 / ISO 37 |
| Tensile strength at break | 350 | psi | DIN 53504 / ISO 37 |
| Elongation at break | 400 | % | DIN 53504 / ISO 37 |
| Shear strength | 247 | psi | DIN 53283 / ASTM D1002 |
| Temperature resistance | -40 to 121 (-40 to 250) | °C (°F) | Typical cured property |
| UV resistance | Excellent | — | Supplier classification |
