Specification Sheet

Sikaflex
®
-291 1 / 3
Product Data Sheet
Version 5/7/2010
Sikaflex
®
-291
Fast Cure Marine Adhesive and Sealant
Technical Product Data (typical values)
Chemical base
1-C polyurethane
Color
White, black, colonial white
Cure mechanism
Humidity-curing
Density (uncured)
10.8 lb/gal
depending on color
VOC (EPA method 24)
0.43 lb/gal (51.5 g/l)
Non-sag properties
Good
Application temperature product
41°F - 104°F (5°C - 40°C)
Tack free time
1
60 min
Open time
1
45 min
Curing speed
(see diagram 1)
Shrinkage
5%
Shore A-hardness (ASTM D 2240)
40
Tensile strength (ASTM D 412)
260 psi
Elongation at break (ASTM D 412)
500%
Tear propagation resistance (ASTM D 624)
34 pli
Glass transition temperature
-49°F (-45°C)
Movement accommodation factor
12.5%
Service temperature permanent
Short term 1 day
1hour
-40° - 194°F (-40° C -+90°C)
248°F (120°C)
284°F (140°C)
Shelf life (storage below 77°F (25°C))
12 months cartridge/unipac
1)
73°F (23°C) / 50% r.h.
Description
Sikaflex
®
-291 is a 1-component,
marine grade polyurethane
elastomeric adhesive and sealant.
Used by many boat builders, its fast
cure time makes it ideal for
applications where speed is
important. Sikaflex
®
-291 is
manufactured in accordance with
ISO 9001 / 14001 quality assurance
system and the responsible care
program.
Product Benefits
- Use above and below water line
- Resists salt water
- Fast strength build-up
- Excellent adhesion to gelcoat,
fiberglass, metal and wood
- May be squeezed or brushed into
place
- Stable
- Paintable
- Versatile packaging
- Excellent bond
- Fast tack-free time
- High solids content
- Sandable
- NSF approved for potable water
(black and white only)
- USDA approved for incidental food
contact.
Areas of Application
- General all-purpose sealant
- May be used for light duty bonding
This product is suitable for
experienced professional users
only. Tests with actual substrates
and conditions have to be
performed to ensure adhesion and
material compatibility.