3M 7000128236 is a half facepiece reusable mask designed for welding applications, providing enhanced comfort and durability. It offers protection against mold and silica, but not for gases such as hydrogen fluoride or mercury vapor. The mask features a bayonet connection type and a cool Flow™ exhalation valve for ease of breathing. This small-sized mask is made of silicone and nylon materials, with a weight of 0.2449 lb. It does not come with a clip-on welding shield or a speaking diaphragm. Spare parts are available for replacement purposes, but the mask does not include a replaceable cartridge. It is not compatible with 3M PAPR or Supplied Air Systems. The mask does not offer eye protection and has a 10 assigned protection factor. The overall consensus is that this mask provides the best range of protection for the mentioned hazards.