Coating for Epoxy substrate
03-05-2015, 05:03 PM,
Coating for Epoxy substrate
Hi all,

I'm looking for some kind of coating for an epoxy encapsulated sensor we have developed for the downhole oilwell industry.

The sensor is approx 4" x 4" x 6" in size and is made from an epoxy that is able to withstand our individual tests of 177°C Temp & 15,000psi Pressure.

However, when we conduct combined pressure & temperature testing to the above values we are getting (what we think is) water migration into the epoxy that changes the composition into a very weak and chalky-type material. Then, post-testing the epoxy cracks and is then useless.

To increase the longevity of these sensors I am looking for a coating of some kind that would 'seal' the epoxy and prevent any moisture from migrating into it that subsequently changes its state.

I appreciate this is a long shot but hope someone could help in any way.

Many Thanks,

03-14-2015, 12:13 AM,
RE: Coating for Epoxy substrate
Hi Paul
There is not coating applications in your case, maybe a high temperature capillar sealant from Loktite or you must change the epoxi, there are many others materials that resist at very high pressure and temperatures, like silicones, and other kinds of resins, I use many kind of resins on my artistic panels.
Best regards
03-20-2015, 03:09 PM,
RE: Coating for Epoxy substrate
Hi Paul,
We use RTV725 on composite material to repair cracks and/or surface delamination exposed to high temperature, such as 200-350°C.
The part is an inlet plenum installed on Auxillary power unit.
Manufacturer is Dow Corning.
Hope it helps

Possibly Related Threads…
Thread Author Replies Views Last Post
  Epoxy Sealants for Ceramic Chromium Oxide DMan 0 666 06-27-2021, 11:39 AM
Last Post: DMan
  Substrate preparation VS bonding strength plzc126330 2 2,503 01-09-2018, 03:48 AM
Last Post: plzc126330
  Zinc arc spray vs Zinc-rich silicate or epoxy paint KeDuan 1 2,772 04-23-2016, 06:05 AM
Last Post: Stephen Booth
  Appling The WC hard coating on Hard substrate behzadsaberi 3 3,766 04-24-2015, 06:04 AM
Last Post: Vadim Verlotski
  Thermal Barrier Coating Aluminum Substrate for corrosion resistance alaskangrown 4 5,605 03-02-2015, 06:43 PM
Last Post: alaskangrown
  Grit blasting epoxy, carbon fibre and titanium in one cabinet? David Churcher 2 4,674 11-30-2012, 01:42 PM
Last Post: MichiganMan
  substrate deformation of WC coating in gate valve ehsan 2 5,265 12-14-2010, 09:15 AM
Last Post: Asiaf
  Spraying on Magnesium substrate Madila Awalini 9 8,101 07-05-2010, 04:01 AM
Last Post: Madila Awalini
  spray and fuse substrate problems pakalano 2 6,529 03-26-2009, 11:44 PM
Last Post: pakalano
  Removing TCC coating from INC625 substrate mightyatom 1 6,199 10-01-2008, 09:41 PM
Last Post: Gordon
  Sand Blasting on Titanium Substrate ykang 8 19,389 05-28-2008, 09:36 AM
Last Post: ykang
  Stress in the substrate Vijay Deshpande 1 4,675 06-10-2007, 07:11 AM
Last Post: Gordon

Users browsing this thread: 1 Guest(s)

Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd