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Purity, Grades and Concentration | BOConline UK
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Purity, Grades and Concentration | BOConline UK
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http://www.boconline.co.uk/en/contact-and-support/technical-advice/speciality-products-advice/purity-grades-concentration/purity-grades.html
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Pure gases are classified by grade. The first digit of the grade classification indicates the 'number of nines' purity, e.g. N3.0 = 99.9% purity. The second digit is ...
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