LED display Potting Material

Here's a link to Encapsulants and Potting Compounds on GlobalSpec. You should be able to find a company that produces a product that meets your specifications.

Yes I do. However be careful. know your application well. I say this because black tends to mean some sort of carbon which depending upon the voltage could cause a conductive path problem. Insulative tends to be quick and easy by going with a silicone yet that could be a doping problem by migration to a semiconductor. A ceramic tends to be very good but from a thermal conductive standpoint stinks! I would sugest that you establish three articles of information that a company like DOW would require to best spec you with a product. Maximum allowable conductivity.( Breakdown voltage spec). Minimum or maximum allowable reflectance at x wave lenght, probably visable spectrum. Expected operating temperature in 'C. Give a company like DOW or BASF or even Locktite a call with that information in hand and just ask. I am certain you will get your product. Or why not just google your question. www.google.com ---- search for "Black Dielectric electronic potting compound manufacturers". Trust me you will get a hit. Hope it helps. The Ashman goeth now!

Thanks both for the quick respone I think I will contact the companys of the link that Chris Leonard has given to me above, but prepared with your more detailed specs.

If you want to get some good basic info on different types of epoxies and potting compounds, search for 'epoxy' on www.mcmaster.com. McMaster is great. The main page on epoxies gives a brief overview of characteristics and typical applications for each type. You can also see what types of packaging each type of epoxy comes in, and what applicators are available. If nothing else, it will give you a good background before you call a manufacturer.

A note on potting electronics - I've found that slow curing epoxies work better than fast. They typically heat up less and fill in gaps better. If you have trouble with air bubbles from mixing hardening into your part, or gaps not being filled, use low amplitude, mid-high frequency vibration during curing. For example, put the part on one of those vibrating massage chairs while it cures. Just make sure it can't vibrate off the table :)

Also try searching for marine epoxy. These typically hold up very well in UV, water, and saltwater; they will give you the best outdoor performance of any cheap off the shelf epoxy. They are usually also more tolerant of surfaces that aren't cleaned completely. I've used 3M 5200 extensively on autonomous underwater vehicles. It comes in black and white. The only things it does not stick to well are neoprene and some other specialty rubbers and plastics. If 3M isn't on your list of people to contact, make sure it is. Optical grade epoxy is also very good for potting electronics, but it is clear.