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
Gray
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

R1043

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

EFFORTLESS APPLICATION - One-part, non-slump formula ensures clean, flexible sealing every time
ULTIMATE WATER BARRIER - Achieves Class 1 W Rating for superior water leakage resistance
UNMATCHED FIRE PROTECTION - Tested to withstand fire up to 3 hours per ASTM E814 & UL 1479 standards
BUILT FOR HARSH CONDITIONS - Durable and weather-resistant to endure tough construction environments
RE ENTERABLE PAINT READY - Easily repairable and primer paintable for seamless finishing

3M Fire Barrier Water Tight Sealant 1000 NS is a professional-grade, single-component silicone sealant designed to provide up to 3 hours of fire resistance while maintaining a Class 1 water tight seal. Its non-slump, flexible formula withstands harsh construction conditions and allows for easy repairs and painting, making it the go-to solution for industrial firestop and waterproofing needs.

Specifications

ASIN	B000KXA6S8
Best Sellers Rank	#107,165 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #96 in Industrial Thread Sealants
Brand Name	3M
Color	Gray
Customer Reviews	4.6 4.6 out of 5 stars (70)
Full Cure Time	2 hours
Global Trade Identification Number	00051115115356
Included Components	FIRE BARRIER WATER TIGHT SEALANT
Item Form	Liquid
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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R1043

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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