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Sika Sikaflex 1A Limestone 10oz 91016
Sikaflex 1A is a premium-grade, high-performance, polyurethane-based, non-sag elastomeric sealant. Sikaflex 1A can be used in green and damp concrete applications and is readily placeable at 40°F.
- Fast tack-free and final cure times
- Excellent resistance to aging, weathering.
- High elasticity - cures to a tough, durable, flexible consistency
$6.01
Availability:
In stock
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SKU
17730
Sika Sikaflex-1A Limestone 10oz 91016
Sikaflex-1A is a premium-grade, moisture-cured, 1-component, polyurethane-based, non-sag elastomeric joint sealant and adhesive. It meets ASTM C920 (Type S, Grade NS, Class 35, Use T, NT, O, M, A, I) and Federal Specification TT-S-00230C Type II, Class A. Sikaflex-1A is designed for vertical and horizontal joints, including green and damp concrete applications, where strong adhesion, long-term flexibility, and weather resistance are required. Maximum sealant depth must not exceed 1/2 in.
Key Features
- 1-component, moisture-cured polyurethane sealant with non-sag consistency.
- Bonds to most construction materials without a primer.
- Capable of plus/minus 35% joint movement (ASTM C719).
- Fast tack-free time and cures to a tough, flexible, tear-resistant seal.
- Can be applied to green concrete 24 hours after pour and damp concrete after 1 hour from getting wet.
- Certified to NSF/ANSI/CAN 61 for potable water (meets applicable requirements of NSF/ANSI 600).
Applications
- Vertical and horizontal building joints, readily placeable at 40°F (4°C).
- Small joints and fillets, windows, door frames, reglets, and flashing.
- Common roofing detail applications and general construction adhesive uses.
- Elastic adhesive between materials with dissimilar coefficients of expansion.
- Submerged conditions such as canal and reservoir joints (allow full cure prior to immersion).
Technical Specifications:
| Property | Value |
|---|---|
| Chemical Base | Polyurethane-based, moisture-cured, 1-component |
| Packaging | 10.1 fl. oz. (300 ml) cartridge |
| Color | Limestone |
| Standards | ASTM C920 Type S, Grade NS, Class 35, Use T, NT, O, M, A, I; TT-S-00230C Type II, Class A; CAN/CGSB 19.13-M87 |
| Shelf Life | 12 months in original, unopened packaging (cartridge) |
| Storage Conditions | Store at 40°-95°F (4°-35°C) |
| Shore A Hardness (21 day) | 45 plus/minus 5 (ASTM C661) |
| Tensile Stress (21 day) | 175 psi (1.21 MPa) (ASTM D412) |
| Elongation at Break | 550% (ASTM D412) |
| Movement Capability | Plus/minus 35% (ASTM C719) |
| Adhesion in Peel | 20 lbs, 0% adhesion loss on concrete, aluminum, and glass (ASTM C794) |
| Tear Strength | 55 lb./in. (ASTM D624) |
| Tack Free Time | 3 to 6 hours (73°F / 50% r.h.) |
| Cure Time | 4 to 7 days (73°F / 50% r.h.) |
| Curing Rate | Up to 1/8 in. after 24 hours (73°F / 50% r.h.) |
| Service Temperature | -40°F to +170°F (-40°C to 77°C) |
Frequently Asked Questions
What joint size limits should I follow?
Sikaflex-1A is designed for joints where the maximum sealant depth does not exceed 1/2 in. Minimum depth is 1/4 in.
Can Sikaflex-1A be applied to green or damp concrete?
Yes. It can be applied to green concrete 24 hours after pour and can be applied to damp concrete 1 hour after getting wet, provided there is no standing water.
Does Sikaflex-1A require a primer?
Priming is not usually necessary. Some substrates or immersion conditions may require priming based on adhesion testing.
When can I paint over the sealant?
The sealant should be allowed to cure for 7 days prior to overcoating. Compatibility and adhesion testing is recommended for the specific paint system.
What are the typical cure and tack-free times?
Tack-free time is 3 to 6 hours and cure time is 4 to 7 days at 73°F and 50% r.h.
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