Sikaflex®-1A is a premium-grade, high-performance, moisture-cured, 1 component, polyurethane-based, non-sag elastomeric sealant. Sikaflex-1a can be used in green and damp concrete applications. 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, A. Canadian standard CAN/CGSB 19.13-M87
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CHARACTERISTICS / ADVANTAGES:
Eliminates time, effort, and equipment for mixing, filling cartridges, pre-heating or thawing, and cleaning of equipment. Fast tack-free and final cure times. High elasticity – cures to a tough, durable, flexible consistency with exceptional cut and tear -resistance. Stress relaxation. Excellent adhesion – bonds to most construction materials without a primer. Excellent resistance to aging, weathering. Proven in tough climates around the world. Can be applied to green concrete 24 hours after pour. Can be applied to damp concrete 1 hour after getting wet Odorless, non-staining. 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.
APPROVALS / STANDARDS:
▪ ASTM C 920, Type S, Grade NS, Class 35, use NT, A, M
▪ Federal specification TT-S-00230 C Type II, Class A
▪ Canadian Standard CANICGSB 19.13-M87
▪ Certified to NSF/ANSI standard 61 for portable water
Product Conditioning: Condition material to 65°-75°F before using. Clean all surfaces. Joint walls must be sound, clean, 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. For green concrete applications control joints must be cut 8 hours prior to sealant installation and in expansion joint forms must be removed 4 hours prior to sealant installation. For wet concrete applications all excess or standing water must be displaced and concrete must then dry for a minimum of 60 min prior to sealant installation. Consult Sikaflex Primer Technical Data Sheet or Technical Service for additional information on priming.
APPLICATION METHOD / TOOLS:
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 contraction. 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. Sikaflex-1a can be applied on green concrete after the concrete has cured for a minimum of 24 hours at 75°F.Control joints must be cut and open for min of 8 hours prior to application. Expansion joints must have forms removed a minimum of 4 hours prior to application. For damp concrete applications Sikaflex-1a can be applied 60 minutes after any and all water has been displaced.