Thermal Grease

#1

Trying to get ahold of techiclal support for T-Global Technology and they do not reply to emails. Do they have a US contact?

#2

Hello @DataMachine,

The only public contact information I am seeing on their site is in the UK, however we are located here in the US. Is there a questions that I could pass on to my T-Global Product manager, or something I can help you with?

-Robert

#3

Thanks. Is that product manager an expert in thermal grease or just familiar with it?

#4

If your question pertains to general application concerns, the page at https://www.digikey.com/eewiki/display/Motley/Thermal+Interface+Materials may prove helpful.

Otherwise, please feel free to ask your question; if an answer is close at hand it’ll be offered. If not, we’ll get a flashlight and look for one. :slightly_smiling_face:

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#5

Thanks. Now tyring to determine diifferenfe in TAICA thermal sheet products.

  1. What is difference between COH series and RE series?
  2. I see that the COH pads are all rated by Needle penetration, except the COH-1706. So, how to I compare the softness of the 1706 to the rest, the COH-1010LVC for example?
#6
  1. The RE series products have a significantly lower volume resistivity and are intended to offer some benefits for RF suppression in addition to thermal transfer, whereas the function of the COH products are primarily thermomechanical in nature. More info here.

  2. The academic approach would be to acquire the defining standards of the different test methods used. The empirical approach (which most people end up using at some point anyway) is to acquire a sample of each material and try them in one’s application. It’s a very reasonable question however, and I’d agree that the difference in test method used is confusing to potential customers.

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#7

Response from the MFG.
(1)
COH-Series vs. RE-Series:

  • The difference is very simple:
    o The main function of both types is to be a Thermal Interface Material (TIM).
    o However, the RE-Series also adds EMI-absorbing capability (sometimes we call it “anti-EMI”).
    o These capabilities (i.e., ability to absorb EMI) are shown on the back of the RE-Series brochure.
    o So (if used in the traditional Thermal Pad application) the RE-series can prevent EMI between the hot electronic device & heat sink, or vice versa.

(2)
Durometer (Hardness) Measurement of TIMs:

Needle Penetration is used because (most of) these materials are too soft to use Shore OO or Asker C (Most people in the U.S. are familiar with Shore A; Shore OO is for even softer materials than Shore A).

However, COH-1706 was just hard enough to use Asker C. Unfortunately, this sometimes causes some confusion, because there’s no easy way to convert between the two measurement methods.

Here’s how they rank, from hardest to softest:

  • COH-1706 27 (Asker C)
  • COH-4000LVC: 45 (Needle Penetration)
  • COH-4065LVC: 65 (Needle Penetration)
  • COH-1019LVC: 90 (Needle Penetration)

Qualitatively, COH-1706 is a little harder than COH-4000LVC, but it’s hard to tell much difference (they’re pretty similar).

(Note, for Needle Penetration, larger number is SOFTER (i.e., -1019LVC is softest).)

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#8

Thanks! Great info and I really appreciate your taking the time.