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🔧 Seal smart, last longer—flexibility meets durability in every bead!
Sikaflex 1A is a premium one-component polyurethane sealant designed for professional-grade sealing of concrete and masonry joints. It offers exceptional flexibility with ±35% joint movement accommodation, strong adhesion without primer, and superior weather resistance. Easy to apply with standard caulking guns, it cures to a durable, elastomeric, waterproof seal ideal for both vertical and horizontal applications including windows, doors, and roofing.










| ASIN | B00MH8ND16 |
| Best Sellers Rank | #65,482 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #41 in Polyurethane Adhesives #142 in Urethane Adhesives |
| Brand Name | SIKA |
| Color | WHITE |
| Customer Reviews | 3.3 3.3 out of 5 stars (21) |
| Full Cure Time | 24 Hours |
| Initial Hardening Time | 6 Hours |
| Item Form | Liquid |
| Item Weight | 1.9 Pounds |
| Liquid Volume | 20 Fluid Ounces |
| Manufacturer | SIKA |
| Material Type | Polyurethane |
| Maximum Gap Fill | 0.5 Inches |
| Model | SIKA-91008 |
| Number of Items | 1 |
| Part Number | 91008 |
| Surface Recommendation | joints, fillets, windows, door frames, reglets, flashing |
| Temperature Range | 4E+1 Degrees Fahrenheit |
| UPC | 033886002981 |
| Unit Count | 20.0 Fluid Ounces |
| Water Resistance Level | Waterproof |
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