Chemical Forums

Specialty Chemistry Forums => Materials and Nanochemistry forum => Topic started by: jsanchez177 on January 24, 2014, 09:50:20 AM

Title: Polypropylene vrs CPVC with 70% Sulfuric Acid
Post by: jsanchez177 on January 24, 2014, 09:50:20 AM

Hey!

Working on developing an Electro-polishing unit and have been using polypropylene fittings. I have been having some issues with leaking in the acid tank (sulfuric) due to a cracking bung. The leak from the polypropylene bung appears after several days of use. The acid is at a 70% concentration and is heated to ~77° C. Would a Chlorinated Polyvinyl Chloride bung be better suited for this application. I failed to find material data for CPVC or Polypropylene at those acid concentrations and elevated temperatures. Anyone have any experience with this sort of thing?

Thank-you in advance!

Regards,
John

Title: Re: Polypropylene vrs CPVC with 70% Sulfuric Acid
Post by: Enthalpy on January 24, 2014, 08:29:59 PM

Why shouldn't you drop two parts, of PP and of CPVC, in the tank and observe for some time?