Sikaflex®-1A - Elastomeric Joint Sealant/Adhesive - Product Data Sheet

Nov 1, 2026

Sikaflex®-1A is a premium, moisture-cured, one-component polyurethane elastomeric joint sealant/adhesive designed for high-performance sealing and bonding. Suitable for green and damp concrete, it meets TT-S-00230C Type II Class A and ASTM C920 specifications. Built for small joints and common construction details, it provides fast tack-free and final cure performance, strong adhesion without primer, non-staining behavior, and resistance to aging and weathering. Coverage, movement capability (±35%), service temperature range, and approved standards support compliant installation in vertical or horizontal joints.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages5

Reading Time13 min

AccessFree to download

Product Description

Uses

Characteristics / Advantages

Approvals / Standards

Product Information

Technical Information

Application Information

Basis of Product Data

Limitations

PRODUCT DATA SHEET Sikaflex®-1A ELASTOMERIC JOINT SEALANT / ADHESIVE PRODUCT DESCRIPTION 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 C920, Type S, Grade NS, Class 35, Use T, NT, O, M, A, I. Canadian standard CAN/CGSB 19. 13-M87 . USES ▪ 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 applictions, 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 expansion. ▪ Submerged conditions, such as canal and reservoir joints. 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 ▪ Non-staining. ▪ Jet fuel resistant. ▪ Certified to NSF/ANSI/CAN 61 for potable water (meets applicable requirements of NSF/ANSI 600) . ▪ Urethane-based; suggested by EPA as a caulk and crack sealant for radon reduction. ▪ Paintable with water-, oil-and rubber-based paints. ▪ Capable of ±35% joint movement. APPROVALS / STANDARDS ▪ ASTM C920, Type S, Grade NS, Class 35, Use T, NT, O, M, A, I ▪ SWRI validated acc. to ASTM C719 (No. 0123-S0128) ▪ Federal specification TT-S-00230 C Type II, Class A ▪ Canadian Standard CAN/CGSB 19. 13-M87 ▪ Certified to NSF/ANSI/CAN 61 for potable water (meets applicable requirements of NSF/ANSI 600) . Product Data Sheet Sikaflex®-1A October 2025, Version 01.09 020511010000000008 PRODUCT INFORMATION | Packaging | 10.1 fl. oz. (300 ml) cartridge, 20 fl. oz. (600 ml) sausage,
4.5 gal (17 L) in a 5 gal pail, 52 gal (197 L) in a 55 gal drum | | | --- | --- | --- | | Color | White, colonial white, aluminum gray, limestone, black, dark bronze, capitol tan, stone and medium bronze. Special architectural colors on request. | | | Shelf Life | Cartridge: 15 months in original, unopened packaging.
Sausage: 18 months in original, unopened packaging.
Pail and Drum: 6 months in original, unopened packaging. | | | Storage Conditions | Store at 40°-95°F (4°-35°C) . | | | TECHNICAL INFORMATION | | | | Testing | (21 day) 45±5 | (ASTM C 661) | | Elongation at Break | 550 % | (ASTM D-412) | | Tear Strength | 55 lb./in. | (ASTM D-624) | | Movement Capability | ±35 % | (ASTM C-719) | | Chemical Resistance | Good resistance to water, diluted acids, and diluted alkalines. Technical Service for specific data. | Consult | | Resistance to Weathering | Excellent | | | Service Temperature | −40 °F to +170 °F | | | Adhesion in peel | Substrate Peel Strength Adhesion loss
Concrete
Aluminium Glass 20 lbs
20 lbs
20 lbs 0 % 0 % 0 % | (ASTM C-794)
(TT-S-00230C) | | Tensile stress at specified elongation | 21 day Tensile Stress 175 psi (1 .21 MPa)
| (ASTM D 412) | | APPLICATION INFORMATION | | | | Coverage
10.1 oz Cartridge: Yield in Linear Feet
Width/Depth 1/4" 3/8" 1/2"
1/4"
3/8"
1/2"
3/4" 1"
1.25" 24.3
16.2
12.1 8.1 10.8 8.1 6.1 5.4 4.0 3.0 2.4
1.5" 2.0 | | | 20 oz Sausage: Yield in Linear Feet Product Data Sheet Sikaflex®-1A October 2025, Version 01.09 020511

FAQs

Where can Sikaflex®-1A be used?

It is designed for joints and fillets where maximum sealant depth will not exceed 1/2 in., including window and door frames, reglets, flashing, roofing details, and many construction adhesive applications in both vertical and horizontal joints.

How fast does Sikaflex®-1A cure and become tack-free?

At 73°F / 50% r.h., it reaches tack-free time in about 3 to 6 hours and can cure in approximately 4 to 7 days, with curing rate up to 1/8 in. after 24 hours.

What movement and temperature performance does Sikaflex®-1A provide?

It is capable of ±35% joint movement and has a service temperature range of −40°F to +170°F, supporting tough, durable, flexible sealing performance.

Nov 1, 2026

Uploaded by anakgang17