Chemical Inventory & Safety

INTERPRETING CHEMICAL HAZARD HMIS RATINGS:

The HMIS (Hazardous Material Information System) rating consists of a set of three numbers representing Acute (or immediate)Toxicity, Fire, and Reactivity, in that order, followed by a letter code for Personal Protection Equipment and ending with a letter(s) for Chronic (or long-term) Toxicity, if necessary. The numerical hazard ratings are as follows:

4

severe hazard

3

serious hazard

2

moderate hazard

1

slight hazard

0

minimal hazard
Chemical Inventory Safety Data Column Key
ct Chronic toxicity hazard, if indicated by an asterisk
at Acute Toxicity
fl Flammability
re Reactivity
pe personal protective equipment
ct2 actual description of Chronic toxicity hazard

The Personal Protection Equipment code (PPE) begins with letter A for least equipment needed (safety glasses), through H (the most common – standing for use of safety glasses, lab coat, gloves, and a hood) and ends with K for something extremely dangerous and requiring elaborate protection, such as self-contained breathing apparatus. Note that a good fume hood may normally be used in place of respirators.

An asterisk next to the Acute Toxicity rating in the first column on the left indicates that a special “Chronic”, or long-term, hazard exists for the chemical, and will be identified by an additional letter(s) immediately following the capitol letter designation for PPE in the last column on the right. In some cases, a chemical could have more than one chronic health hazard letter designation. These special hazards are:

M

mutagen

m

suspected mutagen

T

teratogen

t

suspected teratogen

C

carcinogen

c

suspected carcinogen

A

allergen

S

can cause silicosis
Example: for Benzene, *330Hcm
Acute toxicity is 3, with an associated Chronic hazard
Flammability rating is 3
Reactivity rating is 0
PPE rating is H
Chronic toxicity rating is cm (for suspected carcinogen and suspected mutagen)