It should be noted that facial hair can prevent an airtight seal, rendering the capability of this mask to be used as an NBC mask ineffective. This helps wearers of gas masks who might generally have trouble with facial features in forming a seal with a gas mask. The mask uses a well-designed sealing lip to assist in creating an airtight seal. The Israeli Defense Civilian 4A1 facepiece is made of a formulated impermeable rubber that is soft to wear and easily able to create an airtight seal to the face with, which is the most important consideration for a good NBC gas mask. The primary and functional part of any gas mask is the facepiece, which is responsible for creating a seal of decontaminated space for the face. It should be noted that this is not a CBRN mask, as they provide more protection in a wider range of scenarios as discussed in our rigorous review of CBRN gas masks here. The gas mask itself is made of an impermeable rubber which has a high-resistance to NBC agents and provides a tight seal and comfort to the wearer, allowing the mask to be worn for long periods until a safe, decontaminated area is reached. When used in conjunction with NATO 40mm NBC/CBRN filters, this full face mask is able to be worn in a nuclear, biological or chemical (NBC) contaminated area and provide a decontaminated face seal and filtered air supply to the wearer. This Israeli Defense Force Civilian Gas Mask is an Israeli Civil Defense Authorities approved gas mask.
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