Sikaflex-1a is a premium-grade, high-performance, moisture-cured, 1-component, polyurethane-based, non-sag
elastomeric sealant. Meets Federal specification TT-S-00230C, Type II, Class A. Meets ASTM C-920, Type
S, Grade NS, Class 35, use T, NT, O, M, G, I; Canadian standard CAN/CGSB 19.13-M87.
Designed for all types of joints where maximum depth of sealant will not exceed 1/2 in.
Excellent for small joints and fillets, windows, door frames, reglets, flashing, common roofing detail ap-
plications, and many construction adhesive applications.
Suitable for vertical and horizontal joints; readily placeable at 40°F.
Has many applications as an elastic adhesive between materials with dissimilar coefficients of expan-
Submerged conditions, such as canal and reservoir joints.
Eliminates time, effort, and equipment for mixing, filling cartridges, pre-heating or thawing, and cleaning
Fast tack-free and final cure times.
High elasticity - cures to a tough, durable, flexible consistency with exceptional cut and tear-resistance.
Excellent adhesion - bonds to most construction materials without a primer.
Excellent resistance to aging, weathering.
Proven in tough climates around the world.
Jet fuel resistant.
Certified to the NSF/ANSI Standard 61 for potable water.
Urethane-based; suggested by EPA for radon reduction.
Paintable with water-, oil- and rubber-based paints.
Capable of ±35% joint movement.
10.1 fl. oz. (300 mL), 20 fl. oz. (591 mL), 4.5 gal (17 L) in a 5 gal pail, 52 gal (197 L) in a 55 gal drum
(Material and curing conditions @ 73°F (23°C) and 50% R.H.)
10.1 fl. oz. cartridges
20 fl. oz. uni-pac sausages
5 gallon pail
55 gallon drum
Store at 40°-95°F (4°-35°C). Condition material to 65°-75°F before using.
White, colonial white, aluminum gray, limestone, black, dark bronze, capitol tan, stone and
medium bronze. Special architectural colors on request.
40° to 100°F. Sealant should be installed when joint is at mid-range of its anticipated
-40° to 170°F
3 to 6 hours
Tack-free to touch
21 day 40±5
175 psi (1.21 MPa)
Elongation at Break
85 psi (0.59 MPa)
Issued to: Sika Corporation
Pass ____ Ext:+35% Comp:-35%
Mortar, Aluminum, Glass
[mortar substrate primed with Sika Primer 429]
Copyright © 2012
201 Polito Avenue
601 Delmar Avenue
Carretera Libre Celaya Km. 8.5
Lyndhurst, NJ 07071
Fracc. Industrial Balvanera
Quebec H9R 4A9
Sika and Sikfaflex are registered trademarks.
Printed in Canada.
How to Use
Surface Preparation Clean all surfaces. Joint walls must be sound, clean, dry, frost-free, and free of oil and grease. Curing compound
residues and any other foreign matter must be thoroughly removed. A roughened surface will also enhance
bond. Install bond breaker tape or backer rod to prevent bond at base of joint.
Priming is not usually necessary. Most substrates only require priming if testing indicates a need or where
sealant will be subjected to water immersion after cure.
Consult Sikaflex Primer Technical Data Sheet or Technical Service for additional information on priming.
Recommended application temperatures: 40°-100°F.
For cold weather application, condition units at approximately 70°F; remove prior to using. For best performance,
Sikaflex-1a should be gunned into joint when joint slot is at mid-point of its designed expansion and contrac-
tion. Place nozzle of gun into bottom of the joint and fill entire joint. Keep the nozzle in the sealant, continue
on with a steady flow of sealant preceding the nozzle to avoid air entrapment. Avoid overlapping of sealant to
eliminate entrapment of air.
Tooling and Finishing Tool sealant to ensure full contact with joint walls and remove air entrapment. Joint dimension should allow
for 1/4 inch minimum and 1/2 inch maximum thickness for sealant. Proper design is 2:1 width to depth ratio,
For use in horizontal joints in traffic areas, the absolute minimum depth of the sealant is 1/2 in. and closed cell
backer rod is recommended.
Use personal protective equipment (chemical resistant gloves/goggles/clothing). Without direct contact, remove
spilled or excess product and placed in suitable sealed container. Dispose of excess product and container in
accordance with applicable environmental regulations.
Allow 1-week cure at standard conditions when using Sikaflex-1a in total water immersion situations and prior
When overcoating with water, oil and rubber based paints, compatibility and adhesion testing is essential.
Sealant should be allowed to cure for 7 days prior to overcoating.
Avoid exposure to high levels of chlorine. (Maximum continuous level is 5 ppm of chlorine.)
Maximum depth of sealant must not exceed 1/2 in.; minimum depth is 1/4 in.
Maximum expansion and contraction should not exceed 25% of average joint width.
Do not cure in the presence of curing silicone sealants.
Avoid contact with alcohol and other solvent cleaners during cure.
Do not apply when moisture-vapor-transmission condition exists from the substrate as this can cause
bubbling within the sealant.
Use opened cartridges and uni-pac sausages the same day.
When applying sealant, avoid air-entrapment.
Since system is moisture-cured, permit sufficient exposure to air.
White color tends to yellow slightly when exposed to ultraviolet rays.
Light colors can yellow if exposed to direct gas fired heating element.
The ultimate performance of Sikaflex-1a depends on good joint design and proper application with joint
surfaces properly prepared.
The depth of sealant in horizontal joints subject to traffic is 1/2 in.
Do not tool with detergent or soap solutions.
Do not use in contact with bituminous/asphaltic materials.
10.1 oz Cartridge: Yield in Linear feet