Shurtape PC 857 UL 181B-FX Printed Waterproof HVAC Duct Tape - Strong

In this review the Shurtape PC 857 UL 181B-FX printed cloth HVAC duct tape earns its place for professionals and serious DIYers who need a reliable, code-compliant tape to seal Class 1 flex duct. The single biggest reason to buy is its UL 181B-FX listing clearly printed on the tape, which removes guesswork during installs and inspections while still delivering high holding power and excellent shear strength on rough or not fully clean surfaces.

Key Features

• UL 181B-FX Listed: The listing printed on the tape makes identification during inspection fast and ensures it meets the standards required for Class 1 flex duct installations.
• Waterproof cloth construction: The 14 mil printed cloth backing provides a waterproof barrier and durable surface that resists tearing in typical HVAC work.
• High holding power: Adhesive formulation grips even rough or not fully clean surfaces to maintain a secure seam and long-lasting joins.
• Superior shear strength: Designed to resist shear forces on seams and joins so ducts stay sealed under normal system stresses.
• Easy to tear: The cloth tape can be ripped by hand for quick use on the job without cutting tools, speeding installation.

Who It's For

This tape is aimed at HVAC installers, contractors and maintenance technicians who need a UL-listed solution for sealing, seaming and joining Class 1 flex duct. It is especially useful on jobs where surfaces may be a bit rough or dirty and the technician still needs reliable adhesion and a waterproof finish.

It is less necessary for casual household repairs where UL listing and printed identification are not required; homeowners who only need general-purpose duct tape for non-HVAC tasks could choose a simpler, lower-cost tape.

Pros & Cons

Pros

• High adhesion and stickiness that customers report holds well even in colder conditions.
• Printed UL 181B-FX marking simplifies code compliance and inspection verification.
• Strong, cloth-backed 14 mil construction with good shear strength for seams and joins.
• Easy to tear by hand for faster, tool-free application on site.

Cons

• Priced for professional use, so some users may find value for money mixed compared with general-purpose tapes.

Specifications

Brand	Shurtape
Type	Printed waterproof cloth HVAC duct tape
Listing	UL 181B-FX Listed (printed on tape)
Thickness	14 mil (cloth backing)
Size	72 mm x 55 meters (one roll)
Color/Print	Silver metal printed with listing text

Our Verdict

The Shurtape PC 857 is a solid, professional-grade HVAC tape for anyone who needs a UL 181B-FX listed solution that sticks to rough surfaces and holds seams under stress. Its printed listing, waterproof cloth backing and easy tearability make it good value for contractors and technicians who require dependable performance and clear identification for inspections.

Frequently Asked Questions

Is this tape suitable for sealing Class 1 flex duct?
Yes. It is UL 181B-FX listed and designed specifically to seal, seam and join Class 1 flex duct.

Will it stick to rough or slightly dirty surfaces?
Yes. The adhesive is formulated for high holding power even when surfaces are rougher or not fully clean.

Can the tape be torn by hand?
Yes. The cloth backing provides easy tearability so installers can rip lengths without scissors.