Recent content by nlj

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...

Thanks for the information. I will look into those things. It is DC and is part of a hydraulic system; controlling flow to a variety of hydraulic equipment.

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...

Yes, UHMWPE. Fluid exposure is DOT 4 brake fluid. It is a secondary seal on a mechanical shaft. We are also looking at changing the design to include a mechanical seal such that we are not replying on material properties only.

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...

We suspected overheating however could not get the system to reach temperatures above the wire varnish capabilities using the normal duty profile. Since I posted this we have figured out that the components were not being used per the duty cycle and it is in fact exceeding temperature. I...

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...

It is vehicle application - so normal road wear and conditions. Sizes vary -- mainly brackets (3-5" mating size).

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...

Thanks all!! I have to prove "as-good-as-or-better" to my customer...even for a non-critical part like a mudflap. I'll get on pulling up those listed above. Thanks again!!

The issues spans across several of our parts. Many of the prints just state "Masticated Rubber" but the product shortage is on the Natural Rubber. Our supply base has told us that due to the environmental reasons there simply aren't as many natural rubber sources and they continue to be hand...