---
product_id: 12898938
title: "Fire Barrier Water Tight Sealant 1000 NS, Gray Color, Non-Slump, Ready-To-Use, Single Component, Neutral Cure, 10.1 fl oz Cartridge"
brand: "3m"
price: "€ 64.19"
currency: EUR
in_stock: true
reviews_count: 8
category: "3 M"
url: https://www.desertcart.hr/products/12898938-fire-barrier-water-tight-sealant-1000-ns-gray-color-non
store_origin: HR
region: Croatia
---

# Class 1 water tight seal 3-hour fire resistance Non-slump, ready-to-use silicone Fire Barrier Water Tight Sealant 1000 NS, Gray Color, Non-Slump, Ready-To-Use, Single Component, Neutral Cure, 10.1 fl oz Cartridge

**Brand:** 3m
**Price:** € 64.19
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** Fire Barrier Water Tight Sealant 1000 NS, Gray Color, Non-Slump, Ready-To-Use, Single Component, Neutral Cure, 10.1 fl oz Cartridge by 3m
- **How much does it cost?** € 64.19 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/12898938-fire-barrier-water-tight-sealant-1000-ns-gray-color-non)

## Best For

- 3m enthusiasts

## Why This Product

- Trusted 3m brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless Application:** One-part, non-slump formula stays put on vertical and horizontal surfaces—no mess, no drip.
- • **Superior Water Barrier:** Achieves Class 1 W Rating in UL water leakage tests, ensuring zero compromise on waterproofing.
- • **Unmatched Fire Protection:** Tested up to 3 hours per ASTM E814 & E1966 standards for ultimate firestop reliability.
- • **Re-Enterable & Paint Ready:** Easily repair or repaint over the sealant, maintaining seamless aesthetics and functionality.
- • **Durable & Weather-Resistant:** Engineered to withstand harsh construction environments without losing flexibility or adhesion.

## Overview

3M Fire Barrier Water Tight Sealant 1000 NS is a premium, gray silicone sealant designed for professional firestop and waterproofing applications. It offers up to 3 hours of fire resistance, meets stringent UL water leakage standards with a Class 1 W Rating, and features a non-slump, ready-to-use formula that cures to a flexible, durable seal. Ideal for through-penetration and construction joints, it withstands tough jobsite conditions and is re-enterable and paintable for long-term maintenance.

## Description

3M Fire Barrier Water Tight Sealant 1000 NS is a non-slump, ready-to-use, single component, neutral cure, silicone sealant that cures upon exposure to atmospheric humidity to form a flexible firestop seal. This water tight sealant help control the spread of fire, smoke and noxious gases before, during and after exposure to fire.

Review: no sagging or running - 3M always makes quality products this is not cheap but worked great on the all metal smoke house I'm making from scrap metal parts. The bead holds well on horizontal surfaces. This caulk is extremely sticky so use disposal gloves. I used red oxide primer over the finished caulk and it seems to be adhearing, only time will tell.
Review: 3M and fire made easy. - I think to truly give this a review, I would have to burn the place down. Had to use this around a Laundry dryer vent that went through a fire wall in a Mixed use building as per inspectors request. Long story short, don't let your Hvac / venting guys run a dryer vent through a fire wall or fire blocking.

## Features

- TESTED AND LISTED: For up to 3-hours in accordance with ASTM E814 (UL 1479), ASTM E1966 (UL 2079) and CAN/ULC S115
- FORMS AN EFFECTIVE WATER BARRIER: Meets the UL Water Leakage Test achieving a Class 1 W Rating in accordance with ANSI/UL 1479
- ONE-PART, NON-SLUMP SILICONE SEALANT: For use in both through- penetration and construction joint applications—cures to form a flexible seal
- WITHSTANDS CONSTRUCTION CONDITIONS: Durable sealant provides excellent weatherability during construction
- EASILY RE-ENTERABLE: Formulated as a re-enterable and repairable fire barrier solution
- PRIMER PAINT READY: Sealant is paintable with primer
- For industrial/occupational use only. Not for consumer sale or use.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000KXA6S8 |
| Best Sellers Rank | #143,858 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #120 in Industrial Thread Sealants |
| Brand | 3M |
| Brand Name | 3M |
| Color | Gray |
| Customer Reviews | 4.5 out of 5 stars 69 Reviews |
| 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 Grams |
| Liquid Volume | 10.1 Fluid Ounces |
| Manufacturer | 3M |
| Material Type | Silicone |
| Surface Recommendation | Miscellaneous |
| UPC | 051115115356 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Waterproof |

## Product Details

- **Color:** Gray
- **Brand:** 3M
- **Item Weight:** 204.11 Grams
- **Liquid Volume:** 10.1 Fluid Ounces
- **Full Cure Time:** 2 Hours

## Images

![Fire Barrier Water Tight Sealant 1000 NS, Gray Color, Non-Slump, Ready-To-Use, Single Component, Neutral Cure, 10.1 fl oz Cartridge - Image 1](https://m.media-amazon.com/images/I/41tSuPZ09UL.jpg)

## Questions & Answers

**Q: i need fire resistant whit caulk to caulk fireplace**
A: It’s more of a light gray than white

**Q: does it stay pliable after it dries or does it get hard like mortar?**
A: Stays pliable.  This can be used like a silicone caulking but with fire rating.

**Q: Thinking of using this to fill in holes in my truck's firewall. Any cons?**
A: I would contact 3M customer support

**Q: is this usable for exterior applications?**
A: 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ no sagging or running
*by P***J on September 8, 2018*

3M always makes quality products this is not cheap but worked great on the all metal smoke house I'm making from scrap metal parts. The bead holds well on horizontal surfaces. This caulk is extremely sticky so use disposal gloves. I used red oxide primer over the finished caulk and it seems to be adhearing, only time will tell.

### ⭐⭐⭐⭐⭐ 3M and fire made easy.
*by S***S on March 31, 2016*

I think to truly give this a review, I would have to burn the place down. Had to use this around a Laundry dryer vent that went through a fire wall in a Mixed use building as per inspectors request. Long story short, don't let your Hvac / venting guys run a dryer vent through a fire wall or fire blocking.

### ⭐⭐⭐ Reasonable value for fire caulk, but, check production date
*by R***S on June 16, 2021*

Had a project that required a fair bit of fire caulk. Tried a few tubes individually first. They seemed fine. Ordered a case. Had to return because they were old and had degraded in the tubes. When its nearly $11 a tube, and the caulk blows up in the tube, (and causes a mess in your gun) it's a problem. Amazon stepped up, took back my partially used case, and replaced the case in it's entirety. The new case was just fine, a good product, a good value. Without the need for the return, it would have been a strong 4 stars.

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**Shop now:** [https://www.desertcart.hr/products/12898938-fire-barrier-water-tight-sealant-1000-ns-gray-color-non](https://www.desertcart.hr/products/12898938-fire-barrier-water-tight-sealant-1000-ns-gray-color-non)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-24*