---
product_id: 654788092
title: "Dow Corning 340 Silicone Heat Sink Compound 5oz 142g White Silicone Thermal Coupling Heat Conductive Grease for Electrical Devices PCB Assemblies Computer CPU Heat Sink Non Flowing"
brand: "sanyi"
price: "R$714"
currency: BRL
in_stock: true
reviews_count: 5
url: https://www.desertcart.com.br/products/654788092-dow-corning-340-silicone-heat-sink-compound-5oz-142g-white
store_origin: BR
region: Brazil
---

# Dielectric strength 210 V/mil 0.67 W/mK thermal conductivity Non-flowing & non-curing stability Dow Corning 340 Silicone Heat Sink Compound 5oz 142g White Silicone Thermal Coupling Heat Conductive Grease for Electrical Devices PCB Assemblies Computer CPU Heat Sink Non Flowing

**Brand:** sanyi
**Price:** R$714
**Availability:** ✅ In Stock

## Summary

> 🔥 Keep your tech chill and in control with Dow Corning 340!

## Quick Answers

- **What is this?** Dow Corning 340 Silicone Heat Sink Compound 5oz 142g White Silicone Thermal Coupling Heat Conductive Grease for Electrical Devices PCB Assemblies Computer CPU Heat Sink Non Flowing by sanyi
- **How much does it cost?** R$714 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/654788092-dow-corning-340-silicone-heat-sink-compound-5oz-142g-white)

## Best For

- sanyi enthusiasts

## Why This Product

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

## Key Features

- • **Compact Power Tube:** 5oz (142g) tube delivers professional-grade thermal coupling in a sleek, easy-to-use package.
- • **Reliable Heat Shield:** Non-flowing, low-bleed formula maintains a stable, mess-free thermal interface over time.
- • **Electrical Safety First:** Dielectric strength of 210 V/mil protects sensitive components from electrical interference.
- • **Stay Cool Under Pressure:** High thermal conductivity (0.67 W/mK) ensures your electronics run cooler and last longer.
- • **Effortless Thermal Mastery:** One-part, grease-like silicone—no curing or ovens needed for instant application.

## Overview

Dow Corning 340 Silicone Heat Sink Compound is a high-performance, white silicone thermal grease designed for efficient heat transfer between electrical components and heat sinks. Featuring a thermal conductivity of 0.67 W/mK, dielectric strength of 210 V/mil, and a non-flowing, non-curing formula, it ensures reliable, mess-free thermal coupling without the need for curing ovens. Packaged in a convenient 5oz (142g) tube, it’s ideal for enhancing the longevity and performance of PCBs, CPUs, and other heat-sensitive electronics.

## Description

Dow Corning DOWSIL 340 Heat Sink Compound White is a one component, grease like silicone that is used for thermal coupling of electrical components to heat sinks. It is non-flowing, non-curing, thermally conductive, low bleed, and has high temperature stability.  142 g Tube. White, non-flowing, highly filled compound, good thermal conductivity.  Uses Designed for thermal coupling of electrical devices and PCB assemblies to heat sinks  Benefits Thermally conductive compound 1 part Non flowing No need for ovens or curing Increases reliability with heat flow away from circuitry components  Dow Corning 340 Thermal Compound is a grease-like silicone material with a high amount of thermally conductive metal oxide fillers.  This compound has high thermal conductivity, low oil bleed and good high temperature stability. The compound can maintain consistency up to about 177°C.  Therefore, it helps to maintain a reliable heat sink seal, which will improve the heat transfer from the electrical/electronic components to the heat sink or chassis.  Dow Corning 340 Thermal Compound is used for bases and mounting bolts of transistors, diodes and thyristor rectifiers. It can also be used for effective thermal connection of many heat sinks that require effective cooling.  Typical Use:Compound provides thermal coupling of electrical/electronic devices to heat sinks, can be applied to the base and mounting studs of transistors, diodes and silicon-controlled rectifiers. Brand:Dow Corning Color:White Components:1 part Dielectric Strength:210 V/mil Flash Point:>101.1 °C Specific Gravity: 2.1 Thermal Conductivity:0.67 W/mK Viscosity:542,000 Volume Resistivity:2 x 10^15 ohm-cm

## Features

- Dow Corning 340 Heat Sink Compound, 5oz 142g one tube, Heat Sink Compound, White color, Thermal coupling, Heat Sink & Conductive, Non-flowing, Non-curing, Low bleed, High temperature stability.
- Designed for thermal coupling of electrical devices and PCB assemblies to heat sinks
- Dielectric Strength:210 V/mil. Flash Point:>101.1 °C. Specific Gravity: 2.1. Thermal Conductivity:0.67 W/mK. Viscosity:542,000. Volume Resistivity:2 x 10^15 ohm-cm.
- Thermally conductive compound, 1 part, Non flowing, No need for ovens or curing, Increases reliability with heat flow away from circuitry components

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Silicone |
| Brand | SANYI |
| Package Information | Tube |
| Liquid Volume | 5 Fluid Ounces |
| Item Weight | 142 Grams |
| Recommended Uses For Product | Electrical |
| Flash Point | 101 Degrees Celsius |
| Specific Uses For Product | Prevent Corrosion |
| Item Form | Paste |
| Manufacturer | Molykote |
| Unit Count | 5.0 Ounce |
| SAE J300 Viscosity Grade | 0W-16 |
| Number of Items | 1 |
| Package Dimensions | 6.81 x 1.81 x 1.42 inches |
| Item Weight | 5 ounces |
| ASIN | B0DFWHK2GL |
| Date First Available | September 2, 2024 |

## Product Details

- **Material:** Silicone
- **Brand:** SANYI
- **Package Information:** Tube
- **Liquid Volume:** 5 Fluid Ounces
- **Item Weight:** 142 Grams

## Images

![Dow Corning 340 Silicone Heat Sink Compound 5oz 142g White Silicone Thermal Coupling Heat Conductive Grease for Electrical Devices PCB Assemblies Computer CPU Heat Sink Non Flowing - Image 1](https://m.media-amazon.com/images/I/61IqM9VEPLL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Easy to apply
*by W***S on August 22, 2025*

Easy to use and spread over desired electronics.

### ⭐⭐⭐⭐⭐ Great product!
*by J***F on August 5, 2025*

Works as advertised.

### ⭐⭐⭐⭐ Dowsil 340 Heat Sink Compound - Reliable, But Not for High-Performance CPUs
*by R***R on February 1, 2025*

This thermal compound is not ideal for computer CPUs—its thermal conductivity is barely above water at 0.67 W/mK, while even budget CPU pastes range from 1-2 W/mK. However, where it shines is stability. It won’t dry out like other compounds, making it a solid choice for voltage regulators, power transistors, and similar applications where reliability matters more than peak performance. Recommended with that caveat.

## Frequently Bought Together

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-01-23*