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Bostik 940A
Bostik® 940A is an innovative marine-grade sealant engineered with exceptional resistance to water, weathering, and UV exposure, allowing for use in applications both above and below the waterline. It cures with moisture, with an open time of 45 minutes.
Fulfilled By ChemPoint
- Manufacturer: Bostik, Inc.
- Product Line: Bostik Transportation Adhesives
- Product: Marine Grade Adhesives and Sealants
- Industries: Maintenance, Repair, Overhaul | Transportation
- Authorized Countries: Canada | United States
Fulfilled By ChemPoint
Documents
Overview
Bostik® 940A is a high-performance sealant for marine applications that is formulated with a silyl modified polymer (SMP) with excellent flexibility and durability in harsh environments, such as saltwater and extended UV exposure. Bostik® 940A combines the strength of urethane with the elasticity of silicone. It is designed for demanding bonding and sealing applications both above and below the waterline, such as sealing deck hardware, hull fittings, rub rails, and portholes in marine applications.
Bostik® 940A presents a slower skin-forming time of 35 minutes and an open time of approximately 45 minutes that provides an extended working time for larger applications requiring workability. Bostik® 940A successfully adheres to a range of substrates, bonding to aluminum, steel, zinc, brass, copper, glass, PVC, EPDM rubber, and more. As a moisture-curing adhesive, Bostik® 940A cures well in extreme conditions, withstanding temperatures from −40°F to 230°F (−40°C to 110°C) while resisting weathering, UV, and more.
Specifications
Product type: Performance sealant, marine
Basic material: Silyl modified polymer (SMP)
Temperature resistance: −40°F to 230°F (−40°C to 110°C)
Application temperature: 41°F to 95°F (5°C to 35°C)
Curing method: Moisture
Specific gravity: Approx. 1.4 g/mL
Skin-forming time: Approx. 35 min
Open time: approx. 45 min
Curing speed after 24 hrs: 0.125 in (3 mm)
Shore A hardness: ca. 55
Tensile stress at break: 450 psi
Elongation at break: ca. 225%
Lap shear strength: 375 psi
Primary Chemistry: Silyl modified polymer (SMP)
Features & Benefits
Marine-grade adhesive and sealant
Primerless adhesion
Moisture curing
Environmentally friendly
Easy to use
Free of solvents and isocyanates
UV resistant
Can be used above and below the water line
Long open time
Sandable
Paintable
Compatible with porous and nonporous surfaces
High- and low-temperature resistance
Suitable for bonding of aluminum, zinc, copper, brass, fiberglass, steel, EPDM rubber, polyester, wood, and PVC
Weather resistance
Problems Solved
Damage or failure of adhesive due to UV, water, heat, or weather
Nonsandable, nonpaintable sealants that gum up or hold residue
Applications
Bostik® 940A is a versatile sealant for applications demanding robust durability and stability in the harshest outdoor environments. It is successfully used across a range of applications, including but not limited to the following:
Sealing deck hardware
Thru-hull fittings
Rub rails
Portholes
Related Applications
Maintenance, Repair, Overhaul
Transportation
Related Chemistries
Maintenance, Repair, Overhaul
Transportation
Related End Markets
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