Suitable for HPLC, spectrophotometry, and environmental analysis. Low UV impurity profile, low impurity gradient LC baseline. Very low levels of non-volatile impurities. CAS 7732-18-5. Max. 3 ppm non-volatile matter; Max. 1 mAU (254nm), 5 mAU (210nm.) NOTE: This item ships directly (ground) from our supplier so overnight delivery is not possible. Please consider a recurring order for high-volume use.