Lewisite

CAS RN: 541-25-3

Protective Equipment / Clothing

Rescuer Protection: Respiratory protection: Pressure-demand, self-contained breathing apparatus (SCBA) is recommended in response situations that involve exposure to any level of Lewisite and Mustard-Lewisite Mixture vapor. Skin/ocular protection: Personal protective equipment (PPE) and butyl rubber chemical protective gloves are recommended at all times when these chemicals are suspected to be involved.
Personnel protection: ... Wear positive pressure self-contained breathing apparatus. ... Wear appropriate chemical protective clothing.
/Caution: can produce/ ... severe vesication, even through rubber /Protective clothing/.
Personal Protective Requirements: Arsenical Vesicants, pose both a severe respiratory and severe contact hazard. Wear appropriate fully encapsulating protective gear with positive pressure self contained breathing apparatus (SCBA). Structural firefighters' protective clothing is recommended for fire situations only; it is not effective in spill or release events. Thickened agents pose a less significant vapor hazard but a much more significant contact hazard.
Hold breath until respiratory protective mask is donned. Fire-fighting personnel should wear full protective clothing and respiratory protection during fire-fighting and rescue. Positive pressure, full face piece, NIOSH-approved self-contained breathing apparatus (SCBA) will be worn.
For eye protection: Chemical goggles and face shield
For skin protection: Protective Gloves: Butyl Rubber Glove M3 and M4 Norton, Chemical Protective Glove Set
SRP: When working with strong solutions of acids or bases or other caustic or corrosive materials, always wear a full face mask. When working with caustic or corrosive gases or vapors, a full face mask will not protect the eyes or prevent inhaling the material. A full face respirator is required.
The PPE ensemble selected depends on the level of knowledge available regarding the chemical agent. Respirators chosen initially for responders into a known release area should be a positive pressure self-contained breathing apparatus (SCBA) with a Level A protective suit until monitoring results allow for other decisions. ... Some chemical warfare agents have been shown to seriously degrade and damage some respirators. Respiratory protection specifically approved by NIOSH for CBRN exposures is highly desirable ... There are, depending on exposure levels, other NIOSH approved SCBAs or full-face air purifying respirators, which have been specifically tested by the manufacturer as effective against chemical warfare agents. ... When conditions have been determined to be appropriate for the use of air purifying respirators, a NIOSH-approved CBRN APR Full Facepiece Air Purifying Respirator (APR) with a CBRN Canister, or a Chemical Warfare Agents (CWA) tested full facepiece APR with a combination organic vapor/acid gas/particulate canister may be used. A list of CBRN approved SCBA and APR may be obtained from the NIOSH website.
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