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Sika Sikasil WS-295 Black 20oz Sausage 412144
Sikasil WS-295 is a one-part neutral-cure weathersealing silicone in a Black 20 oz sausage for glazing and curtain-wall joints. It holds +/-50% movement and reaches tack-free in approximately 50 minutes at 77 F.
- ASTM C920 Class 50 with +/-50% joint movement
- Neutral-cure weatherseal for glazing and curtain walls
- Tack-free in approximately 50 minutes at 77 F
$552.60
Availability:
Out of stock
Sikasil WS-295
Sikasil WS-295 is a one-part, neutral-cure silicone weatherseal for glazing, curtain walls, and perimeter sealing that meets ASTM C920 Type S, Grade NS, Class 50. This Black 20 oz sausage (part 412144) holds +/-50% joint movement, reaches approximately 200 psi tensile and 700% elongation, and is tack-free in approximately 50 minutes at 77 F. It resists UV and ozone, is non-staining on most porous substrates, and is SWRI validated to ASTM C719 (No. 123-SIK295).
Key Features
- One-part neutral-cure medium-modulus silicone weatherseal
- Meets ASTM C920 Type S, Grade NS, Class 50, Use NT, M, G, A, O
- Joint movement +/-50%
- Tack-free approximately 50 minutes at 77 F; full adhesion in 7 to 14 days
- Approximately 200 psi tensile and 700% elongation
- Holds SWRI ASTM C719 validation (No. 123-SIK295) and ASTM C1248 non-staining results on porous substrates
Applications
- Weatherseal work in conventional glazing, including cap, toe, and heel beads
- Glass-to-glass butt joint glazing weatherseals
- Expansion and control joints in precast panels and metal curtain walls
- Perimeter weathersealing of doors, windows, and building components
Technical Specifications
| Property | Value |
|---|---|
| Manufacturer | Sika |
| Product | Sikasil WS-295 |
| Part no. | 412144 |
| Unit | 20 oz (600 ml) sausage |
| Color | Black |
| Chemistry | One-part neutral-cure silicone |
| Movement | +/-50% (ASTM C-719) |
| Tensile / elongation | Approximately 200 psi / 700% |
| Tack-free | Approximately 50 minutes at 77 F |
| Service temperature | -80 to 350 F |
| VOC | 37 g/L |
Product documents: Sikasil WS-295 Product Data Sheet (PDF)
Frequently Asked Questions
What movement capability does Sikasil WS-295 hold?
+/-50% under ASTM C-719 at 77 F and 50% R.H., matching ASTM C920 Class 50.
What tack-free time should crews plan for with Sikasil WS-295?
Tack-free time is approximately 50 minutes at 77 F and 50% R.H. Full adhesion develops in 7 to 14 days.
What joints suit Sikasil WS-295 on the facade?
Conventional glazing beads, glass-to-glass butt weatherseals, precast and metal curtain-wall joints, and perimeter seals at doors and windows.
What staining result does Sikasil WS-295 show under ASTM C1248?
No staining on porous substrates under ASTM C1248. ASTM C-510 also reports no stain or color change.
What service temperature range applies after Sikasil WS-295 cures?
Service temperature runs from -80 F to 350 F once cured.
What size is the Sikasil WS-295 sausage on this page?
This page is the Black 20 oz (600 ml) sausage, part 412144.
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