i need fire resistant whit caulk to caulk fireplace

It’s more of a light gray than white

does it stay pliable after it dries or does it get hard like mortar?

Stays pliable. This can be used like a silicone caulking but with fire rating.

Thinking of using this to fill in holes in my truck's firewall. Any cons?

I would contact 3M customer support

is this usable for exterior applications?

3M 1000NS-CART 10.1 Oz. Fire Barrier Water Tight Sealant helps prevent further damage during new construction. It is best for wall or vertical applications. Dynamic and static construction joints.

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3M Fire Barrier Water Tight Sealant 1000 NS, Gray, 10.1 fl oz Cartridge

3M Fire Barrier Water Tight Sealant 1000 NS, Gray, 10.1 fl oz Cartridge

Product ID: 12898938

Details

Brand
3M
Color
Grey
Full Cure Time
2 hours
Item Weight
204.11 g
Liquid Volume
10.1 fluid

💧Class 1 water tight seal

🔥3-hour fire resistance

🛠️One-part, non-slump silicone

€ 60.50

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In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Seal the deal with 3M’s fire & water tight barrier! 💧

EFFORTLESS APPLICATION - One-part, non-slump formula that cures flexible and durable—no mess, no fuss.
SUPERIOR WATER BARRIER - Achieves Class 1 W Rating for leak-proof performance under ANSI/UL 1479 standards.
UNMATCHED FIRE PROTECTION - Tested to withstand fire up to 3 hours, ensuring ultimate safety compliance.
BUILT FOR HARSH CONDITIONS - Weather-resistant sealant designed to endure tough construction environments.
RE ENTERABLE PAINT READY - Easily repairable and primer-paint compatible for seamless finishing touches.

3M Fire Barrier Water Tight Sealant 1000 NS is a professional-grade, single-component silicone sealant that delivers up to 3 hours of fire resistance and a Class 1 water tight seal. Its non-slump, flexible formula withstands harsh construction conditions, is re-enterable for repairs, and paint-ready for a flawless finish—perfect for industrial firestop and waterproofing applications.

Specifications

ASIN	B000KXA6S8
Best Sellers Rank	#217,612 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #175 in Industrial Thread Sealants
Brand	3M
Brand Name	3M
Color	Grey
Customer Reviews	4.6 out of 5 stars 70 Reviews
Full Cure Time	2 hours
Global Trade Identification Number	00051115115356
Included Components	FIRE BARRIER WATER TIGHT SEALANT
Item Form	Liquid
Item Highlight	Non-Slump, Ready-To-Use, Single Component, Neutral Cure
Item Type Name	3M FIRE BARRIER WATER TIGHT SEALANT 1000 NS, GRAY, 10.1 FL OZ CARTRIDGE, 12/CASE
Item Weight	204.11 g
Liquid Volume	10.1 fluid ounces
Manufacturer	3M
Material Type	Silicone
Model	1000-N/S-10.1OZ
Number of Items	1
Number of Packs	1
Part Number	051115115356
Surface Recommendation	Miscellaneous
UPC	051115115356
Unit Count	1 Count
Water Resistance Level	Waterproof

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€ 60.50

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered 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 Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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