level crossing. Kettle's on. Posts: 17176 Good Answers: 399 # 2 Re: breathable oxygen from MnO2 and H2O2 05/17/2012 8:52 AM http://cr4.globalspec.com/search/sitesearch? do=show&sort=textmatchrank&srch=breathable% 20oxygen&order=asc The Apollo astronauts breathed ≈100% oxygen at 1/5 atmosphere pressure. __________________ Not everyone who wanders is lost. Not everyone who is alone is lonely. Reply Doorman Guru