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Was there a major change in the Health rating criteria?  I am looking at MSDS from 2013 that state isopropanol has a health rating of 1, yet when I look at the 2017 edition, the data clearly indicates that it is level 0 (LD50 (oral and dermal) over 2000mg

Question asked by Karen Corr on Jun 24, 2016
Latest reply on Jun 24, 2016 by Paul Smith

I am looking at several MSDS from 2013 that state isopropanol has a health rating of 1, yet when I look at the 2017 NFPA edition, the data clearly indicates that it is level 0 (LD50 (oral and dermal) over 2000mg/kg and LC50 well over 10,000ppm).

 

Why would these reputable companies state that the health rating is 1??   I am unsure of which value to use for our storage tanks and I do not want to choose the wrong one.

 

Here are the numbers...please confirm which health rating it should be assigned:

First MSDS:         

LD50 (oral) = 4,420 mg/kg

LD50 (dermal) = 13,000 mg/kg

LC50 = 16,970 ppm

 

Second MSDS:

LD50 (oral) = 3,360 mg/kg

LD50 (dermal) = 12,800 mg/kg

LC50 = 16,000 ppm

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