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Member

Join Date: Mar 2012
Posts: 5

Need Suggestion on Material Selection

03/05/2012 11:53 PM

I am working on the encapsulation of a miniature sensor system (fiber optic sensor+ PCB)

The potting material need to possess the following features:

1. optical clarity (clear, translucent, amber)

2. medium viscosity 1,000-100,000 cps (if we are talking about epoxy)
3. mechanical impact resistant (hardness+ tensile elongation)
4. non-conductive 5. good high temperature (>150 C) properties
Any suggestions?

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#1

Re: Need suggestion on material selection

03/06/2012 12:16 AM

My advice is to select a couple of well known vendors and present your project to them. I assume this isn't your first project, so you may have some trusted companies in mind.

You'll just get opinions here, based on what everybody used in their last project. No conclusions will be made based on your specific requirements, because you have not given us enough information here to make an informed suggestion.

There are tons of epoxies, acrylics, urethanes and even some silicones that might work, we don't know.

Talk to some suppliers, you'll just get confused here.

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#2

Re: Need suggestion on material selection

03/06/2012 12:45 AM

Have you considered a UV curable epoxy? There are various types, so you might be able to find one that meets all of your requirements.

http://www.masterbond.com/products/uv-curable-systems

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#3

Re: Need Suggestion on Material Selection

03/06/2012 4:04 PM

There are multiple encapsulant materials available and many applicator methods also.

DOW chemicals can also offer a range and there are other suppliers. If you google "RTV encapsulants" you will get many options. There is also one that starts with "M" from the US that specialises in UV cured materials that have a range of flow/gell materials that are essentially clear. (Able to inspect fine pitch solder joints through 4mm thickness using magi lamp.)

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#4

Re: Need Suggestion on Material Selection

03/06/2012 11:33 PM

Everything you ever wanted..... These are good people with good stuff and if they do not have it they will consider they will need it. http://www.hapcoweb.com/

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