Sikaflex-15 LM is a high-performance, low-modulus, 1-component polyurethane sealant designed for demanding construction and facade applications. This non-sag elastomeric sealant offers exceptional movement capability, strong adhesion to a wide range of substrates, and long-term weather resistance for vertical and horizontal joint applications.
Ideal for commercial construction, EIFS systems, concrete panels, window and door perimeters, flashing details, and high-movement facade joints, Sikaflex®-15 LM cures to a durable, flexible consistency with outstanding cut and tear resistance.
FEATURES
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Low modulus formulation provides excellent flexibility and stress relaxation
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High movement capability rated at +100/-50% per ASTM C719
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1-component polyurethane sealant ready to use with no mixing required
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Non-sag consistency ideal for vertical and sloped applications
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Excellent adhesion to most construction materials without primer
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Weather resistant performance proven in harsh climates worldwide
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Paintable surface after cure
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Jet fuel resistant formulation
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Non-leaching polyurethane technology
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EIFS compatible and tested in accordance with ASTM C1382
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UL fire-rated joint systems available for select assemblies
TYPICAL APPLICATIONS
- Concrete expansion and control joints
- Precast concrete panel systems
- Window and door perimeter sealing
- Reglets and flashing terminations
- Roofing detail applications
- EIFS joints and transitions
- High-rise facade movement joints
- Similar and dissimilar material joints
SPECIFICATIONS
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Product type: Polyurethane elastomeric sealant
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Consistency: Non-sag
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Modulus: Low modulus
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Packaging: 20 fl oz sausage
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Pack quantity: 20 sausages per box
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Movement capability: +100/-50%
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Tack-free time: 2–6 hours
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Final cure: 7–10 days
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Application temperature: 40°F to 100°F
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Storage temperature: 40°F to 95°F
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Shelf life: 18 months unopened
STANDARDS & COMPLIANCE
- ASTM C920, Type S, Grade NS, Class 100/50
- Federal Specification TT-S-00230C, Type II, Class A
- Federal Specification TT-S-001543A, Type Non-Sag
- ASTM C1382 tested for EIFS applications
- UL Fire Rated Joint Systems compatible
AVAILABLE COLORS
- White
- Colonial White
- Off-White
- Black
- Almond
- Medium Bronze
- Redwood Tan
- Stone
STORAGE & HANDLING
Store unopened material in dry conditions protected from direct sunlight between 40°F and 95°F. Condition material to 65°F–75°F before application for best performance.
20 OZ SAUSAGE – YIELD IN LINEAR FEET
| Joint Width |
1/4" Depth |
3/8" Depth |
1/2" Depth |
| 1/4" |
48.1 ft |
— |
— |
| 3/8" |
32.1 ft |
21.4 ft |
— |
| 1/2" |
24.1 ft |
16.0 ft |
12.0 ft |
| 3/4" |
16.0 ft |
10.7 ft |
8.0 ft |
| 1" |
— |
— |
6.0 ft |
| 1-1/4" |
— |
— |
4.8 ft |
| 1-1/2" |
— |
— |
4.0 ft |
RESOURCES
