Product details ▾
  • Permanently seals metal duct joints
  • Will not drip or sag
  • Non-flammable
  • Effective in low, medium, and high pressure systems
  • Mildew resistant
  • Low shrinkage
  • Superior adhesion to metal
  • UL 181B-M Listed
  • UL 723 Classified
  • May be used for indoor or outdoor applications
  • Conforms to NFPA 90A and 90B requirements
  • Remains flexible
  • Manufactured by S.M.W.I.A. Local 12

Type 45 –  25mm x 5mm x 8m Roll


PROseal is a premium water based high velocity duct sealant.

Basic Use

To seal metal to metal joints against air leaks in low, medium, and high pressure duct systems.

 Technical Information

Base: Synthetic latex emulsion
Colour: Gray
Type: Water Base
Weight: Approx 5kg Per gallon
Solid Contents: 66% + 2%
Viscosity: 350,000 c.p.s.
Application Temperature: 2ºC to 45ºC
Service Temperature: -32ºC to 79ºC
Storage Temperature: 4ºC to 29ºC
Dry To Touch: 1 Hour (approximate)
Cure Time: 24 to 72 Hours +(depending on humidity, application, and temperature)
Flammability: Non-flammable in both wet and dry state
Flash Point: No flash to boiling
Mildew Resistant: Excellent
Water Resistant: Excellent
Flexibility: Excellent
Freeze Thaw Stability: 5 cycles
Coverage: 2.3 sq m/gal at 1.5mm
Odour: Mild (wet), None (dry)
Shelf Life: 1 Year (unopened container)
Cured Sealant: Tough and permanently flexible
Packaging: 1/12 gallon tubes (25 tubes/case)
  1 gallon pail (4 gal/case)
  5 gallon pail
  55 gallon drum
Flame Spread: 0
Smoke Developed: 0


Limited Product Warranty

Ductmate (EUROPE) Limited is not liable for consequential, incidental or special damages. There are no statutory or implied warranties including the warranties for fitness for a particular purpose and merchantability. There are no warranties other than as set forth below and Ductmate neither assumes nor authorises any person to assume any liability or other obligation in connection with PROseal.

PROseal is warranted to be free from any and all defects in material and workmanship only at the time of shipment from our plant. If material is shown to be defective at the time of shipment from our plant, Ductmate will replace or issue credit for the original purchase price.

PROseal will provide an airtight seal between most surfaces normally used in duct construction when installed according to the printed application directions. To determine the suitability of PROseal for each specific purpose, the user must make his own test and determination. Ductmate does not guarantee the results from the use of PROseal because of the extreme differences in surface texture and possible porosity of available materials and the possibility of structural movement or externally caused damages.


Directions for Use

Surface Preparation: 

For good brushability, store at room temperature at least 24 hours before applying. Surfaces should be clean, dry and free of any dirt, oil, grease, water or foreign matter.


DO NOT THIN.  Do not apply when rain or freezing temperatures will occur within 36 hours.

When used in conjunction with sheet metal: 

Apply by brush, hand, trowel or spray. PROSeal should be applied to duct connections according to all applicable HVAC standards. Apply to inside of female fittings and outside of male fittings.  Assemble the joint. Brush sealant over the assembled joint. Thoroughly cover joint and screws with a 50 – 75mm wide band.  Assembly should cure for 24 – 72 hours before pressure testing the system. Since field temperature/humidity conditions may vary, longer setting times may be required for specific installations.  Apply at a rate of 4.6 sq m per gallon (0.75mm thick).