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Sika Sikasil WS-290 Black 20oz Sausage 412141
Sikasil WS-290 is a one-part neutral-cure ultra low-modulus silicone in a Black 20 oz sausage for EIFS, curtain walls, and high-movement joints. It holds +100/-50% movement and reaches tack-free in approximately 50 minutes at 77 F.
- ASTM C-920 Class 100/50 with +100/-50% movement
- Ultra low modulus Shore A 12 for dynamic joints
- Suited for EIFS weatherseals and metal curtain walls
$14.15
Availability:
Out of stock
Sikasil WS-290
Sikasil WS-290 is a one-part, neutral-cure, ultra low-modulus silicone sealant that meets ASTM C-920 Type S, Grade NS, Class 100/50 for expansion joints, metal curtain walls, nonstructural glazing, and EIFS weatherseals. This Black 20 oz sausage (part 412141) reaches tack-free in approximately 50 minutes at 77 F, holds +100/-50% joint movement, Shore A 12, and VOC of 29 g/L. It resists UV and ozone with low to no bleed and is validated to ASTM C719 (SWRI No. 623-SIK290).
Key Features
- One-part neutral-cure ultra low-modulus silicone
- Meets ASTM C-920 Type S, Grade NS, Class 100/50, Use NT, M, G, A, O
- Joint movement +100/-50%
- Tack-free approximately 50 minutes at 77 F; tooling approximately 30 minutes
- Shore A hardness 12 with VOC 29 g/L
- Holds SWRI ASTM C719 validation (No. 623-SIK290) and ASTM C1248 non-staining results on porous substrates
Applications
- Seals expansion and control joints in precast concrete and metal curtain walls
- Weatherseal work in glass-to-glass butt joint glazing
- Nonstructural glazing cap, toe, and heel beads
- Exterior Insulation Finish Systems (EIFS) weatherseals
Technical Specifications
| Property | Value |
|---|---|
| Manufacturer | Sika |
| Product | Sikasil WS-290 |
| Part no. | 412141 |
| Color | Black |
| Unit | 20 oz (600 ml) sausage |
| Chemistry | One-part neutral-cure ultra low-modulus silicone |
| ASTM | C-920 Type S, Grade NS, Class 100/50 |
| Movement | +100% / -50% |
| Shore A | 12 |
| Tack-free | Approximately 50 min at 77 F |
| Tooling | Approximately 30 min |
| VOC | 29 g/L |
Product documents: Sikasil WS-290 Product Data Sheet (PDF)
Frequently Asked Questions
What movement capability does Sikasil WS-290 hold?
+100% extension / -50% compression under ASTM C-719 at 77 F and 50% R.H., matching ASTM C-920 Class 100/50.
What tack-free and tooling times should crews plan for with Sikasil WS-290?
Tack-free time is approximately 50 minutes at 77 F and 50% R.H. Tooling time is approximately 30 minutes; higher temperature or humidity shortens both. Full adhesion develops in 7 to 14 days.
What joints suit Sikasil WS-290 on the wall?
Expansion and control joints in precast panels and metal curtain walls, nonstructural glazing beads, glass-to-glass butt weatherseals, and EIFS weatherseals that need high movement.
What staining result does Sikasil WS-290 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-290 cures?
Service temperature runs from -80 F to +350 F once cured.
What size is the Sikasil WS-290 sausage on this page?
The Black sausage is 20 oz (600 ml), part 412141. The PDS also covers 10 oz cartridges and 2 gal pails.
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