DOWSIL Contractors Weatherproofing Sealant
A one-part, moisture cure, medium modulus sealant that provides durable, flexible, watertight joints and offers outstanding unprimed adhesion to most non-porous substrates.
DOWSIL Contractors Weatherproofing Sealant is a silicone sealant from Dow. Dow lists it for sealing dynamically moving joints. Dow rates its movement capability at +/-25 to +/-40, which decides whether a moving joint is inside its range. Cranco carries it, and which counter has it on the day changes, so ask at the counter.
DOWSIL CWS is a one-part, moisture-cure silicone sealant made by Dow for joints that move. Dow rates it at 25 to 40% extension and compression, it needs no primer on most nonporous substrates including glass and aluminium, and it comes in 20 standard colours, 19 special colours and custom matches.
Cranco carries Dow at Concord, Barrie and Mississauga. Call the branch to confirm the colour and size in stock, and the price.
FEATURES AND BENEFITS
- It is specifically developed for sealing dynamically moving joints.
- Primerless on most common nonporous building substrates.
- Balanced adhesive strength, medium modulus and high recovery.
- Excellent all-weather gunnability and performance.
- Extension/compression capability of ±25 to ±40 percent.
- Sealing dynamically moving joints such as expansion and control joints, concrete panel joints, tilt-up panel joints, curtainwall joints, perimeter caulking (windows, doors, panels, EIFS, bedding of mullions, panels, and frames, etc.)
- Choose from 20 standard colors, 19 special colors and custom colors, too.
- 5 Year Weatherseal Limited Warranty.
What is DOWSIL CWS used for?
Joints that move: expansion and control joints, concrete and tilt-up panel joints, curtain wall joints, and perimeter caulking around windows, doors, panels and EIFS, including bedding mullions, panels and frames. Dow rates it at 25 to 40% extension and compression.
Is DOWSIL CWS 100% silicone?
It is a one-part silicone that cures with moisture from the air. Dow's own description of the product calls it a moisture-cure silicone sealant, and that is why it needs no primer on nonporous substrates.
How long does DOWSIL CWS take to cure?
Cranco holds Dow's catalogue entry for this product, and the catalogue gives no skin, tack-free or cure time. The counter can confirm the current figure with Dow before you schedule work that depends on it.
Is DOWSIL CWS paintable?
Dow's CWS material Cranco holds does not state whether the sealant is paintable. Confirm paint compatibility with Dow before specifying CWS for a joint that will be painted.
What colours does DOWSIL CWS come in?
20 standard colours and 19 special colours, and Dow will match a custom colour. Both charts are below. Cranco does not stock all 39, so call the branch with the colour you need before you plan the run.
What sizes does DOWSIL CWS come in?
The catalogue Cranco holds lists 305 mL and 600 mL. Cranco's own page lists a wider range of cartridges, sausages, pails and drums. Dow's data sheet is linked below and it settles which sizes Dow makes today. Call the branch for what it has.
Where can you buy DOWSIL CWS?
At Cranco's counters in Concord, Barrie and Mississauga. The addresses, phone numbers and hours are further down this page. Call ahead with the colour and the size, and the counter will tell you what they have that day.
Branches
Call the branch to confirm what it has in stock today, and the price.
Colours
Dow publishes a colour range for this product.
Call the branch for the colour you need.
Data sheet
- DOWSIL CWS data sheet Dow, PDF