TMC-704 (DC-704 Equivalent) Diffusion Pump Oil – TMC Industries, Inc.

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TMC-704 (DC-704 Equivalent) Diffusion Pump Oil

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TMC-704 silicone diffusion pump fluid is single component, tetramethyl tetraphenyl trisiloxane, clear fluid developed for deep vacuum levels of 10-6 torr (untrapped) and 10-8 torr (trapped). TMC-704 is chemically equivalent to Dow Corning® DC-704.  TMC-704 diffusion pump fluid is used by many aerospace, optical coating, glass, and vacuum heat-treating companies.

TMC-704 performs well in tough, rugged applications with quick pump-down, even after exposure to air at high temperatures. It is thermally and chemically stable, which keeps pump jets free of tars and hard carbon.

Due to its dielectric properties, it is also used effectively as a reliability test fluid for high temperature (>400°F) applications using liquid to liquid thermal shock testing and as a fill fluid for chemical process control instruments.

Product Features

  • Superior oxidation, heat, and chemical resistance.
  • Does not crack under heat or intake gas, unlike petroleum and fatty acid ester pump oils.
  • Does not emit oxidation gas.
  • Does not produce acid, tar, pitch, or other substances when vacuum is broken during heating.
  • Enables prolonged and stable operation of vacuum pumps.

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.

Technical Datasheet
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