Skip to content

Hardcast® Indoor/Outdoor Water-Based Duct Sealant 1 gal. (Gray)

SKU Item CCW-181G
Original price $18.98 - Original price $18.98
Original price
$18.98 - $18.98
Current price $18.98
Safety Standards
California Prop 65 Yes
Weights and Dimensions
Operating Weight (lbs) 11.75
Exterior Dimensions (D) (inches) 7.750000
Exterior Dimensions (W) (inches) 7.750000
Exterior Dimensions (H) (inches) 7.500000
Shipping Weight (lbs) 13.000000



A versatile, all-purpose duct sealant for use on all types of metal duct, fiberglass duct board, duct fabric and flex duct. CCWI- 181 incorporates a built-in polyester reinforcement for exceptional strength, with UV inhibitors for outdoor use. UL 181A-M listed / UL 181B-M listed.


• Color: Gray
• Consistency: Heavy textured
• Base: Synthetic latex
• Solvent: Water
• Weight per Gallon: 11.6 lbs.
• Solids Content: 73.4%
• Viscosity: Thixotropic
• Coverage (UL 181 A-M) : Apply 18 mil, scrim, addt. 18 mil
• Coverage (UL 181 B-M) : Approximately 214 to 320 lin. ft. per gal. at 20 to 30 mil wet film thickness at 3" width
• Shore A Hardness: > 20
• Flexibility: Passes ¼ inch mandrel bend
• Time to Test: 48 hours*
• Service Temperature: -20°F to 200°F
• Mildew Resistance: Mold & Mildew resistant
• VOC:
Exempt: 0 g/l
Non Exempt: 38 g/l (less water)
• Surface Burning: Flame Spread - 0, Smoke Developed – 0 (When tested in accordance with ASTM E84, UL 723)
• Pressure Classes: SMACNA ½ , 1, 2, 3, 4, 6 and 10 inches w.g.
• Seal Class: Meets Seal Class A
• Packaging: 11 oz. cart.; 1, 2 & 5 gal. pails
• Freeze/Thaw Stability: Passed 5 Cycles

All orders take about 2-24 business hours to process and ship out. All packages will ship Monday-Friday.

Your order will be packaged with care and discretion. Items are securely wrapped to prevent shifting while in transit.

When your order is shipped, you will receive an email notification which includes a tracking number. You can also track your order through your profile page here.

Orders Over A Certain Weight Are Subject To Pallet Deliveries Which Could Be Subject To Higher Shipping Costs, However Shipping Speeds Remain The Same 1-4 Days, Depending On Location.

Please note: Tracking numbers often take up to 24 hours to be recognized by carriers. If you attempt to track your order and the tracking number returns a non-trackable message, please try again later as your tracking number may not have yet been fully recognized by your carrier. 

-We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.

-Please note: After 30-Days a Restocking Fee will be applied to all returns after 30-Days.
-To be eligible for a return, your item must be in the same condition that you received it, unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
-To start a return, you can contact us at or come in-store. 
- Items sent back to us without first requesting a return will not be accepted.

-Unfortunately, WE CANNOT accept returns on Clearance, Sales Items & Gift Cards

Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Exceptions / non-returnable items
Certain types of items cannot be returned, like perishable goods (such as food, flowers, or plants). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare