Recent content by BLN

Miller Stephenson makes spray on PTFE coatings you might try. I use them to make elastomeric gaskets.

We used polyurethane potting on a couple of our electronic modules, and I'm curious as to why you are using a foam? If we have any voiding, moisture makes its way to the board and shorts it out.

I know from our manufacturing floor, it's a lot easier to measure weight than volume for high speed manufacturing.

We've had great success with Minnesota Rubber (www.mnrubber.com). They custom formulated an EPDM for us, but they do most any elastomer and can mold them as well.

Go to http://www.matweb.com/. You'll have to register, but it's free. Once you are in search for material types. Under polyethylene you'll find low density (LDPE), linear low density, medium density, and high density PE. the Website will not only give general properties, it includes...

It sounds like a hefty job. Just amassing the material properties will keep you busy for some time. I had started to list some of the things to add and realized I could be here the rest of the afternoon working on the list. If you want to see how an excellent materials database is set up, go...

There's not just one flavor of silicone adhesive. Are you looking at an addition cure or a condensation cure silicone? What is the monomer used to build the chain? Is it ambient cure or elevated cure? In other words, there is no one single answer to the question. Contact GE or Dow...

Laser marking would work and would eliminate the need to dispose of chemicals used in chem etching. Control Micro Systems make lasers for metal part marking.

Try: http://www.mountaingrout.com/. Look under "flexible" for the MSDS and see if this is what you need.

I seem to remember a company I used to work for also tested to 125% MEOP (maximum expected operating pressure) for proof testing.

You're also dealing with compression set. Over time under load, elastomers will achieve a permanent deformation known as compression set. Another factor to help determine the extent of set is the temperature.

Have you considered laser marking? There are a lot of laser marker suppliers out there - Control Micro Systems, Telesis, TDK to name a few.

What's the rubber and what's the "shiny metal".

Teflon is a DuPont trade name so you won't find anything specific to it. However if you're looking for PTFE (polytetrafluoroethylene) I found 29 standards at the ASTM specification search website (http://www.astm.org/search/iatoc). You can look through them to see which one(s) are applicable.

The question was how to differentiate between different grades of stainless using chemical analysis. Thanks for the inputs. I also found 3 ASTM test methods that detail chemical tests to quantify alloying constituents to determine which steel you have.