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...
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.
