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HMIS has undergone several revisions since it was developed. The color-coding and numeric rating system correspond to that established in NFPA 704; however, HMIS expands the white section (i.e., protective equipment) further than NFPA 704. An alphabetic code system was developed to provide PPE requirements to personnel.
- A – Safety glasses
- B – Safety glasses and gloves
- C – Safety glasses, gloves, and apron
- D – Face shield, gloves, and apron
- E – Safety glasses, gloves, and a dust respirator
- F – Safety glasses, gloves, apron, and a dust respirator
- G – Safety glasses, gloves, and a vapor respirator
- H – Splash goggles, gloves, apron, and vapor respirator
- I – Safety glasses, gloves, and a dust and vapor respirator
- J – Safety goggles, gloves, apron, and a dust and vapor respirator
- K – Airline hood or mask, gloves, full suit, and boots
- X – Consult your supervisor or SOG (standard operating guide) for special direction
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