Would this be good to use around a dry stack fireplace where cold air pours in through the cracks?

That's certainly not it's intended purpose. I'm sure there are products that would work better for what you want that would also be less expensive.

What happens if this is used in an exterior application?

I used mine in an unusual circumstance, to bond soft decorative brick faces to a high heat painted stainless steel surface (backing to a bio-ethanol fireplace). Even after following instructions for a controlled curing/heating process, the sealant was bonded to the steel nicely and also the soft brick face, but the brick face shrunk slightly, causing the sealant to separate and the brick fell off. Maybe I did something wrong or not long enough. I'd say it is more for an indoor/dry weather free application. Outside it may not dry completely to rain and high humidity. Once bonded and dried completely though it is pretty strong, great adhesion.

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3M Fire Block Sealant FB136, Gray, 10.1 fl oz Cartridge, Single Component

3M Fire Block Sealant FB136, Gray, 10.1 fl oz Cartridge, Single Component

Product ID: 100223598

Details

Brand
3M
Color
Gray
Full Cure Time
24 hours
Item Weight
16 ounces
Liquid Volume
10.1 fluid

💧Water-based for easy cleanup

🔥Heat resistant up to 2000°F

🧱Bonds to concrete, metal, wood & more

250 kr

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Description

🔥 Seal the deal with 3M Fire Block – where safety meets smart innovation!

UNMATCHED HEAT DEFENSE - Withstands scorching temperatures up to 2000°F, ensuring ultimate fire protection.
SAG RESISTANT DURABLE - Stays put in vertical and overhead spots, maintaining integrity without sagging or running.
AIR FIRE BARRIER IN ONE - Blocks drafts and fire passage, reducing air infiltration while meeting strict building codes.
VERSATILE SURFACE BONDING - Adheres seamlessly to concrete, metals, wood, plastic, and cable jacketing for all your sealing needs.
EFFORTLESS APPLICATION CLEANUP - Water-based formula means quick installation and hassle-free cleanup—no harsh chemicals required.

3M Fire Block Sealant FB136 is a lightweight, halogen-free, cementitious fireblock designed for non-rated residential and commercial construction. It offers superior adhesion to multiple surfaces, resists heat up to 2000°F, and acts as an effective draftstop. With a quick tack-free time of 15 minutes and water-based cleanup, it ensures durable, sag-resistant sealing that complies with IBC and IRC fireblocking standards.

Specifications

ASIN	B005PYXUEY
Best Sellers Rank	#11,945 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #51 in Adhesive Caulk #95 in Industrial Sealants
Brand Name	3M
Color	Gray
Customer Reviews	4.4 4.4 out of 5 stars (512)
Full Cure Time	24 hours
Global Trade Identification Number	00051115165917
Included Components	3M Fire Block Sealant FB 136, 1 Each
Initial Hardening Time	15 minutes
Item Form	Paste
Item Weight	16 ounces
Liquid Volume	10.1 fluid ounces
Manufacturer	3M
Material Type	Halogen-free, Non-Combustible
Model	FB 136
Number of Items	12
Number of Packs	12
Part Number	051115165917
Surface Recommendation	Pipe
Temperature Range	1.38E+3 °F
UPC	051115165917
Unit Count	1 Count
Water Resistance Level	Waterproof

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250 kr

Duties & taxes included

In stock

Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Denmark.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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