Molykote 340 Heat Sink Compound – TMC Industries, Inc.

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DowSil 340 HEAT SINK COMPOUND - EXPIRES 12/28/2023

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  • CARTRIDGES - 12/29/2023
  • CANS - 12/28/2023

Compound provides thermal coupling of electrical/electronic devices to heat sinks.

Key Properties

NLGI Grade 2, white, used primarily as a non-curing and non-flowing thermally conductive compound.

Compound is applied to the base and mounting studs of transistors, diodes, and silicon-controlled rectifiers. It can also serve as an effective thermal coupler for many heat sink devices where efficient cooling is required. It is also suitable for aircraft engines where heat sink properties are required.

Features & Benefits
High thermal conductivity; Low bleed; Stable at high temperatures.

Product Details

Product Type:




NLGI Grade:



Zinc Oxide

High Temp:


Low Temp:





Yes - a shipping surcharge may be applied

Shipping Policy

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

Shipping Time -- Most orders received before 3:00PM Central Time will ship the same day, provided the product ordered is in stock. Most orders received after 3:00 PM will ship the next business day. Orders are not processed or shipped on Saturday, Sunday or major US holidays.

We cannot guarantee when an order will arrive. Consider any shipping or transit time offered to you by the carrier as an estimate. We encourage you to order in a timely fashion to avoid delays caused by shipping or product availability.

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

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