ISO standards free download ISO 1389-9:1977 pdf download – Phthalic anhydride for industrial use – Methods of test ISO 1389-9:1977 pdf download - Phthalic anhydride for industrial use - Methods of test This part of ISO 1389 specifies an iodometric method for the determination of impurities oxidizable in the cold by potassium permanganate in phthalic... 03-01 Read More