Anyone ever come across an ASTM D2000 line call out as follows: 5BC415SA14B14C12F19K11. 5BC415 I understand; A14, B14, etc., I understand. The S between 5BC415 & A14 is throwing me. It's on an old Naval Sea Systems Command print for a flapper valve from 1978. It may be a typo but I know...
Can anyone tell me if there is a difference in performance of American process Zinc Oxide as compared to French process Zinc Oxide in polychloroprene compounds? I want to sub French process zinc oxide for American process zinc oxide due to supply concerns. Formula is general purpose based on a...
I'm trying to get the compound to swell more in ethyl alcohol per customer request. I will certainly look at decreasing the crosslink density. Thanks very much.
Need to get more swell out of a peroxide cured NBR compound for a gasket application. Best I've gotten is approx 2% change in thickness after 72 hr immersion at room temp in ethyl alcohol. Anything I can add to the compound to get more swell? I need about 4 to 6%. Thanks very much.
To everyone that responded to my post, thank you very much for your imput. We think we found the cause of the increased acidity in the rain run-off. It's amazing how a bit of untidiness on the part of Maintenance can cause difficulties.
Again, thanks to all.
The concern is the significant increase in acidity from last year to this year. I work in a rubber mixing plant and there's been no increase in the types or volume of chemicals we use nor any change in our housekeeping procedures. So I'm looking at any potential source including fluid-leaking...
Thanks to MintJulep and CoryPad for your replies. In reply to Pat, no I'm not a student and yes I graduated high school a very long time ago. I'm just trying to find any possible causes of why our rainwater run off tested highly acidic. Thanks.
