| 摘要 |
PURPOSE:To provide a heat resistant cover for a mask suitable for use in a sparking environment, such as welding operation, a heat resistant dustproof mask and a heat resistant filter element for this mask. CONSTITUTION:This heat resistant cover 1 for the mask consists of cloth made of heat resistant fibers having the lower air permeation resistance than the air permeation resistance of a mask filter medium part 2 and has an area to cover the entire part of the outer surface on the gas inflow side of the filter medium part. This dustproof cover is mounted with the cover 1. This filter element is arranged in a housing container in such a manner that inhaled air passes the filter medium part after the heat resistant sheet. The heat resistant cover or sheet captures sparks and protects the filter medium part in such a manner. |
