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.

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

3M Fire Block Sealant FB136, Gray, 10.1 fl oz Cartridge, Single Component | High Temperature and Smoke Passage Resistant

3M Fire Block Sealant FB136, Gray, 10.1 fl oz Cartridge, Single Component | High Temperature and Smoke Passage Resistant

Product ID: 100223598

Details

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

💧Water-based for easy cleanup

🔥Heat resistant up to 2000°F

🛠️Bonds to concrete, metal, wood & plastic

¥4631

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

Description

🔥 Seal the deal with 3M Fire Block – where safety meets seamless performance!

AIR SMOKE BARRIER - Effectively blocks drafts and smoke passage, enhancing fire safety and energy efficiency.
UNMATCHED HEAT DEFENSE - Withstands scorching temperatures up to 2000°F, keeping your projects safe and secure.
EFFORTLESS WATER CLEANUP - Water-based formula means quick, mess-free installation and disposal.
UNIVERSAL SURFACE BONDING - Adheres flawlessly to concrete, metal, wood, plastic, and cable jacketing for versatile applications.
SAG FREE VERTICAL OVERHEAD USE - Stays put without running or sagging, even in challenging positions.

3M Fire Block Sealant FB136 is a high-performance, lightweight cementitious sealant designed for industrial and commercial fireblocking. It resists extreme heat up to 2000°F, bonds to multiple surfaces including concrete and metal, and features a water-based formula for easy cleanup. Its sag-resistant, quick-hardening paste effectively blocks fire, smoke, and air infiltration, meeting key building codes for enhanced safety and durability.

Specifications

ASIN	B005PYXUEY
Best Sellers Rank	#10,034 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #39 in Adhesive Caulk #79 in Industrial Sealants
Brand Name	3M
Color	Gray
Customer Reviews	4.4 4.4 out of 5 stars (511)
Included Components	3M Fire Block Sealant FB 136, 1 Each
Initial Hardening Time	15 minutes
Item Form	Paste
Item Weight	1.1 pounds
Liquid Volume	10.1 fluid ounces
Manufacturer	3M
Material Type	Plastic
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

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

¥4631

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

View all Trustpilot reviews