Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

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KT

#11467

Adhesive Evaluation | 13 May, 1999

Looking for a reasonably priced portable device to do strength test(shear/twist)on glue cured Cap/Res. Any suggestions? Thanks

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#11468

Re: Adhesive Evaluation | 14 May, 1999

| Looking for a reasonably priced portable device to do strength test(shear/twist)on glue cured Cap/Res. Any suggestions? Thanks | My torque watch came from Waters Manufacturing, Inc. A div of Talley Industries. Longfellow Center, Wayland Massachusetts 017778. It's a few years old, so I don't know if the company is still around. It was only a couple hundred bucks. And it does a good quick & easy job of evaluating cured strengths.

I'm not a big fan of twisting the parts off, though. It'll give you good comparative data, but the way parts get knocked off is usually be shear. My shear tester is from Chattilon Gages, 7609 Business Park Drive, Greesnboro, NC. (910) 668-0841. It does a great job of giving actual shear strengths. But it was a couple thousand dollars.

When we did adhesive qualifications about a year ago, Heraeus 944 and 955 came out on top. This stuff was so strong, that ceracmic chip caps would break before the adhesive bond. When the components let go, part of the component would still be stuck to the board.

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P.L. Sorenson - Technical Consultant

#11469

Re: Adhesive Evaluation | 14 May, 1999

| | Looking for a reasonably priced portable device to do strength test(shear/twist)on glue cured Cap/Res. Any suggestions? Thanks | | | My torque watch came from Waters Manufacturing, Inc. A div of Talley Industries. Longfellow Center, Wayland Massachusetts 017778. It's a few years old, so I don't know if the company is still around. It was only a couple hundred bucks. And it does a good quick & easy job of evaluating cured strengths. | | I'm not a big fan of twisting the parts off, though. It'll give you good comparative data, but the way parts get knocked off is usually be shear. My shear tester is from Chattilon Gages, 7609 Business Park Drive, Greesnboro, NC. (910) 668-0841. It does a great job of giving actual shear strengths. But it was a couple thousand dollars. | | When we did adhesive qualifications about a year ago, Heraeus 944 and 955 came out on top. This stuff was so strong, that ceracmic chip caps would break before the adhesive bond. When the components let go, part of the component would still be stuck to the board. | Unless this product is used in a controlled temperature environment, keep in mind that adhesive properties vary dramatically with temperture. The adhesive that has the best properties at room temperture may not be the best overall choice when strength is measured over the ambient.

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