---
product_id: 395204747
title: "SI 5331, Liquid Thread Sealant for Pipes, Silicone Sealer for Cold and Hot Water Carrying Plastic and Metal Pipes, Vibration Resistant Silicone Sealant, 12x100ml"
brand: "loctite"
price: "VT49180"
currency: VUV
in_stock: true
reviews_count: 5
category: "Loctite"
url: https://www.desertcart.vu/products/395204747-si-5331-liquid-thread-sealant-for-pipes-silicone-sealer-cold
store_origin: VU
region: Vanuatu
---

# Approved for drinking water use Vibration resistant secure hold Temp resistant -50 to +150°C SI 5331, Liquid Thread Sealant for Pipes, Silicone Sealer for Cold and Hot Water Carrying Plastic and Metal Pipes, Vibration Resistant Silicone Sealant, 12x100ml

**Brand:** loctite
**Price:** VT49180
**Availability:** ✅ In Stock

## Summary

> 🔒 Seal it once, trust it forever — the pro’s choice for leak-proof pipes!

## Quick Answers

- **What is this?** SI 5331, Liquid Thread Sealant for Pipes, Silicone Sealer for Cold and Hot Water Carrying Plastic and Metal Pipes, Vibration Resistant Silicone Sealant, 12x100ml by loctite
- **How much does it cost?** VT49180 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/395204747-si-5331-liquid-thread-sealant-for-pipes-silicone-sealer-cold)

## Best For

- loctite enthusiasts

## Why This Product

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

## Key Features

- • **Ready-to-Use Convenience:** One-component paste in 12x100ml tubes—no mixing, no hassle, just apply and seal
- • **Universal Thread Sealant:** Perfectly seals plastic & metal pipe threads for hot & cold water systems
- • **Vibration-Resistant Security:** Locks joints firmly in place, preventing loosening under industrial or agricultural vibrations
- • **Certified Safe for Drinking Water:** WRAS, DVGW & NSF P1 approvals ensure compliance and peace of mind
- • **Permanently Elastic & Low Strength:** Cures via humidity to maintain flexible, leak-proof connections without overtightening

## Overview

LOCTITE SI 5331 is a high-performance silicone thread sealant designed for industrial and professional use on plastic and metal water pipes. It forms a permanently elastic, vibration-resistant seal effective from -50°C to 150°C, suitable for hot and cold water systems. Certified safe for drinking water applications, this one-component, paste-like sealant cures via humidity and comes in convenient 12x100ml tubes, ensuring secure, leak-proof connections in plumbing, agriculture, and wastewater installations.

## Description

LOCTITE SI 5331 - Thread sealant for plastic pipingLoctite SI 5331 is ideal as a thread sealant for various forms of water pipe insulation. The universal thread sealant is gel and can be used to seal hot and cold water-bearing plastic and metal threads and fittings, e.g. to secure plastic pipelines in industrial, agricultural or sewage systems. The sealant is single-component, so no mixing is necessary. It cures through humidity exposure at ambient temperatures to form a low-strength, permanently elastic seal which is effective against both cold and hot water. The low strength of the gasket is maintained at temperatures up to 150°C. In addition, the joints are protected against vibration loads. Based on acetoxy silicone, the silicone is white and has a paste-like consistency. LOCTITE SI 5331 is approved for use in drinking water systems*, DGVW approved** and NSF category P1 approved*** for use as a food processing sealant in areas where contact with food is not possible.Apply the sealant to the desired threaded parts (the parts may be as supplied or cleaned with a damp cloth or paper towel before application). The product should be applied to both male and female threads. To ensure an even distribution, brush down to the base of the thread. For use in drinking water installations, allow thread sealant to cure for 96 hours at 20 to 23°C before use.The Product Benefits at a Glance:Sealant for sealing threadsIdeal for plastic pipingFor metal, plastic or bothTemperature resistant from -50 to +150°COne-component & low strengthVibration resistantColour: WhiteFormat: 12x100ml tube*WRAS approval (BS 6920) for drinking water: 0706521**DVGW approval, tested according to EN 751-1***P1 NSF Reg. No.: 123620

Review: Having tried using Loctite 55 on a swimming pool MPV and having the valve still leak at the threaded joints, I opted to try out this liquid sealant. I put the liquid on both the make and female joints and easily screwed them in by hand. I waited 24hr before I turned on the pump & when I did, there were no leaks from any of the joints. I’ve bought another tube as backup, I’ll be using this stuff instead of PTFE Tape and silicone from now on.
Review: Livraison et produit parfait

## Features

- Universally applicable - The water pipe sealant is ideal for hot and cold water-bearing plastic threads or plastic/metal combinations, e.g. in industrial installations
- Low-strength thread sealant - The piping sealant hardens via air humidity to form a permanently elastic seal. This seals effectively against both cold and hot water
- Secure connections - The connections made with the thread seal are secured and resistant to vibration loads for a secure hold of the threads in plumbing fittings
- Securing and sealing - The piping thread leak sealer is ideal for securing and sealing plastic piping and pipelines in industry, agriculture or wastewater systems
- Package contents - LOCTITE SI 5331, only for industrial usage, plumbing thread sealant based on acetoxy silicone, one-component sealant, paste-like consistency, white, 12x100ml tube

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0052EGAXK |
| Best Sellers Rank | #121,393 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #643 in Hardware Sealers |
| Brand Name | LOCTITE |
| Color | White |
| Compatible Material | Plastic |
| Container Type | Bottle |
| Customer Reviews | 4.5 4.5 out of 5 stars (252) |
| Full Cure Time | 96 Hours |
| Included Components | 1x LOCTITE SI 5331 |
| Item Form | Paste |
| Item Package Quantity | 1 |
| Item Type Name | LOCTITE SI 5331 |
| Item Weight | 0.22 Pounds |
| Manufacturer | Henkel |
| Material Type | Metal,Plastic,Silicone |
| Model | 5331 |
| Number of Pieces | 12 |
| Other Special Features of the Product | Strong |
| Part Number | 2061031 |
| Specific Uses For Product | Craft |
| Tensile Strength | 175 Pounds Per Square Inch |
| Unit Count | 100 Milliliters |
| Viscosity | High Viscosity |
| Viscosity Level | High |
| Volume | 1200 Milliliters |
| Water Resistance Level | Not Water Resistant |

## Product Details

- **Brand:** LOCTITE
- **Item form:** Paste
- **Material:** Metal,Plastic,Silicone
- **Special features:** Strong
- **Specific uses for product:** Craft

## Images

![SI 5331, Liquid Thread Sealant for Pipes, Silicone Sealer for Cold and Hot Water Carrying Plastic and Metal Pipes, Vibration Resistant Silicone Sealant, 12x100ml - Image 1](https://m.media-amazon.com/images/I/61jOKpRl5KS.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by A***N on 26 February 2026*

Having tried using Loctite 55 on a swimming pool MPV and having the valve still leak at the threaded joints, I opted to try out this liquid sealant. I put the liquid on both the make and female joints and easily screwed them in by hand. I waited 24hr before I turned on the pump & when I did, there were no leaks from any of the joints. I’ve bought another tube as backup, I’ll be using this stuff instead of PTFE Tape and silicone from now on.

### ⭐⭐⭐⭐ Review
*by D***N on 3 July 2022*

Livraison et produit parfait

### ⭐ Review
*by C***N on 12 September 2023*

Only received 2 tubes! Make this right and ill order more and update this rating.

## Frequently Bought Together

- LOCTITE SI 5331, Liquid Thread Sealant for Pipes, Silicone Sealer for Cold and Hot Water Carrying Plastic and Metal Pipes, Vibration Resistant Silicone Sealant, 12x100ml
- LOCTITE 55 Pipe Thread Sealant, Non Curing Plumbers Tape for Plumbing Pipes and Fittings, Reliable Fast Action Cord for Metal and Plastic, 160m
- LOCTITE 577, Medium Strength Industrial Adhesive for Thread Sealing, Universal Liquid Adhesive for Pipes and Metal Threads, Chemically Resistant Thread Sealant, 50ml

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**Shop now:** [https://www.desertcart.vu/products/395204747-si-5331-liquid-thread-sealant-for-pipes-silicone-sealer-cold](https://www.desertcart.vu/products/395204747-si-5331-liquid-thread-sealant-for-pipes-silicone-sealer-cold)

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-05-17*