The design of HK Mask is referred by that of 3-layer surgical mask in the market. The filtration efficiency of a piece of kitchen towel paper is close to that of N70. The design of HK Mask is referred by that of 3-layer surgical mask in the market. There are a number of material chosen for the middle layer filter ranging from Kitchen Towel Paper to Nanofilter. The mask can be safely used after replacing a new middle layer filter to a cleaning and sterilizing the inner and outer layer cloth. There are a number of material chosen for the middle layer filter ranging from Kitchen Towel Paper to Nanofilter. The HK Mask is composited with a disposable middle layer filter which is sandwiched by a cloth mask as the outer and inner layers. The mask can be safely used after replacing a new middle layer filter to a cleaning and sterilizing the inner and outer layer cloth. There are a number of material chosen for the middle layer filter ranging from Kitchen Towel Paper to Nanofilter. HK Mask is a reusable cloth mask with a disposable middle layer filter. Kwong during the outbreak of COVID-19 in early 2020. The HK Mask is composited with a disposable middle layer filter which is sandwiched by a cloth mask as the outer and inner layers. The mask can be safely used after replacing a new middle layer filter to a cleaning and sterilizing the inner and outer layer cloth. HK Mask is a reusable cloth mask with a disposable middle layer filter. The filtration efficiency of a piece of kitchen towel paper is close to that of N70. The filtration efficiency of a piece of kitchen towel paper is close to that of N70. The design of HK Mask is referred by that of 3-layer surgical mask in the market. HK Mask is a reusable cloth mask with a disposable middle layer filter. Kwong during the outbreak of COVID-19 in early 2020. Kwong during the outbreak of COVID-19 in early 2020. The HK Mask is composited with a disposable middle layer filter which is sandwiched by a cloth mask as the outer and inner layers.。
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