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I know that XLPE gets improved creep resistance as compared to just PE. I also understand hat nylons are generally creep resistant due to the crystallinity. I am wondering which would have higher creep resistance at higher temperature (110C); cross-linked polyethylene or nylon 11? The...

Does anybody have experiences (good or bad) with a certain solenoid potting material? We are having issues with a nylon potting material melting and a polyurethane potting degrading. Other than potting compound are there any suggestions on waht may be causing the solenoid to reach such a high...

Besides the obvious difference between the base polymer, what is the difference bewtween polyolefin foams and polyurethane foams? In looking at the differences, the processing and therefore cost, appear different. If using as an air seal are there major difference to be aware of? All of my...

I have been reading through ASTM D2000 and corresponding standards, however I cannot find specific detail on how composition is controlled. I have field failures of a part specified to be polychloroprene (neoprene) per ASTM D2000 M2BC etc. I have been supplied with third party FTIR revealing...

Hello All, We have a UHMW seal that is currently failing when subjected to testing. When exposed to -40F the seal is not reliable. The seal works fine at higher temperatures (200F). I ran TMA on the new versus used seal and found the CTE to be about 30 points lower on the used seal. I am...

Hello All, Is anyone familiar with wire varnish aging or degradation over time? I have had failures occuring and we have come to a couple of conclusions that there are two different wire varnishes being used....a polyamide-imide and an urathane acrylate. The other difference is porosity found...

Hello! I have a part that is made of 7 ply aramid fiber silicone. We are having some burst problems and our supplier believes it is an undercure. (I believe their process is very out of control, but that is another conversation). I'm trying to determine some testing that can help us...

Do you need a barrier (protective coating)when galvannealed sheet steel is mounted to aluminum? I would think no, but wanted to confirm. Thank you!

Hi! I'm looking to use ASTM D4000-12 or ASTM D4066-01 on some engineering drawings. I have determined that I need the following: ASTM D4066-01 PA 011 B0003___ <--This 5th line item is "to be determined" and I'd like to use this position to add in a brittleness temp/cold temp application...

Is anyone else having issues with the masticated rubber shortage? If so, what are your steps forward and alternative materials that you are using? We have been researching a few options, enduraprene and tigerthane, but both have their plusses and minuses. Thank you!

Hi! I've been researching various polymers for a temp range or -40F to 250F, that need to be resistant to 242 oil and 80W90 oil. I've found PEEK as an option, but was hoping to find some less expensive options. Thanks much for your input!

Our lab is looking to buy an FTIR spectrometer. Any suggestions on what to buy or what not to buy?

I have just read Thread 330-248132 on Temper Embrittlement and have some questions regarding a failure that I am currently analyzing. The component is supposed to be 4147 but is 4140 deoxidized with silicon and grain refined with aluminum. The mechanical properties of one failure are TS 184...

I'll apologize for the very long post, but I've been working on this failure for a few months now and have gathered a lot of data. We are experiencing a large amount of brass fitting failures as of late. These fittings have been in service since the 1980s and have been C 36000 brass from the...

I've been chasing a fuel hose failure for some time now. We switched suppliers in April 2009 and the new hoses are cracking whereas we have no report of the old supplier hoses cracking. The hoses are stored in a covered area while in service, so likely wouldn't see significant UV. I've been...

Does anyone know of a good resource for fracture toughness data for induction hardened material (in particular 52100 and 4140H)? All of the research I have conducted thus far had fracture toughness data for quench and temper material only. Thank you!

Is there a place to look up DIN equivalents for ASTM steel standards? I'm looking for equivalents for ASTM A656, Grade 80 and ASTM A572, Grade 50. Thanks!

I have a component currently made of anodized 6060-T6 Aluminum. The component has two wear surfaces that extend in a twisting manner to unlock a latch. I'm told by the designers that aluminum was chosen in efforts to reduce weight and it was anodized to assist in wear resistance. I was...

I'm looking for a material that can be used as an alternator guard. Therefore this material would be close to an engine and would see high temperatures. Additionally, the material has to be compatible with brake fluid, engine oil, diesel fuel, transmission fluid and coolant. I was...

We currently have a rectangular shaped water tank made of polypropylene. The tank is a large tank designed to hold 3,000 and 4,500 gallons of water. The majority of the tank welds are welded using extrusion welds. We are looking to redesign the tank and the new tank would have more complex...