Is this ul rated for a dryer vent transition duct (the duct connecting from dryer to wall). max temp is 212f?

Don't know about dryer duct. Is made for HVAC ductwork. May not carry the amount of heat your asking about. Does stand up to long periods of heat and a/c if under the house or in the attic.

How thick is the foil?

It's not just foil. It's attached to another material that makes it fairly thick. You can't tear it with your bare hands - it has to be cut. The Amazon description might give you more information.

Mild smell from the adhesive, but most ductwork is not in a living space where smell does not matter.

Want to use this tape to seal insulation around rv. Is this tape safe for the rv? Don’t want to damage the outside walls.

I used it in my RV to seal air conditioning duct work and it works perfectly for that purpose. It is very sticky and sticks like crazy wherever you put it. It is not meant to be removed but it sounds like you are putting it to a good use. It is approved for use in a house so I assume it is safe for an RV.

Sf 686 Ul Shurmastic Butyl Foil Indoor Outdoor Hvac Tape

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VT22779

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal like a pro, last like a legend.

PAINTABLE FINISH - Customizable silver foil surface accepts aluminum-compatible paint for seamless integration with your project aesthetics.
MOISTURE AIRTIGHT SEAL - Instant water-resistant adhesion ensures airtight, moisture-proof protection on metal, rubber, and duct surfaces.
CERTIFIED CLEARLY MARKED - UL 181B-FX Listed with printed certification for instant jobsite verification and peace of mind.
INDUSTRIAL GRADE DURABILITY - 17 mil thick butyl foil tape engineered for long-lasting indoor/outdoor HVAC sealing.
WIDE TEMPERATURE RESILIENCE - Performs flawlessly from freezing -20°F to scorching 200°F environments without losing grip.

Shurtape SF 686 UL ShurMASTIC is a premium 3" x 33.3-yard butyl foil HVAC tape designed for superior airtight and moisture-resistant sealing. UL 181B-FX Listed and boasting a robust 17 mil thickness with 23.8 PSI tensile strength, it excels in extreme temperatures from -20°F to 200°F. Ideal for indoor/outdoor HVAC applications, it offers instant adhesion, is paintable, and free from harmful substances like asbestos, CFCs, and PCBs.

Specifications

ASIN	B01M6ZV9BA
Adhesive Format	Wide Roll
Adhesive Location	Full Surface
Adhesive Side Count	1
Best Sellers Rank	#31,022 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #64 in Butyl Tape
Brand	Shurtape
Brand Name	Shurtape
Color	Silver Printed
Compatible Material	Metal, Rubber
Customer Reviews	4.7 out of 5 stars 248 Reviews
Foil Thickness	17 Mils
Global Trade Identification Number	00040074020504
Included Components	HVAC Tape
Item Dimensions L x W x Thickness	3"W x 0.02"Th
Item Resistance	water_resistant
Item Thickness	0.02 Inches
Item Weight	2.82 Pounds
Manufacturer	Shurtape Technologies
Material	Aluminum
Material Type	Aluminum
Model	111163
Number of Items	1
Other Special Features of the Product	Water Resistant
Part Number	111163
Recommended Uses For Product	Indoor, Outdoor
Size Name	One Size
Special Feature	Water Resistant
Surface Recommendation	Metal
Tensile Strength	23.8 Pounds Per Square Inch
UPC	040074020504
Unit Count	1 Count
Upper Temperature Rating	200 Degrees Fahrenheit
Water Resistance Level	Water Resistant

Reviews

T**P

17.02.2026

A**R

30.03.2026

R**5

31.10.2025

K**.

17.04.2026

S**N

2.05.2026

H**R

12.10.2025

S**N

22.07.2025

S**.

22.08.2025

J**E

22.11.2020

M**S

10.10.2025

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