Even if the PITTA mask is cleaned for 3~8 times, the dust isolation rate can still be guaranteed. You can clean the mask by rubbing it gently with clean water. It is not recommended to use detergents such as washing powder for high-intensity cleaning. The white mask will turn yellow slightly after repeated cleaning, which is caused by the particularity of polyurethane materials, rather than the performance degradation or variation.

Extended data

Precautions for correctly wearing masks

1. In order to give full play to the protective function of the mask, when wearing the mask, the folded face should be fully unfolded, the mouth, nose and jaw should be completely wrapped, the elastic band of the mask should be tightened as much as possible, and the aluminum sheets on both sides of the nose should be pressed to reduce the leakage around, and it is best to breathe slowly.

2. Wash your hands before wearing a mask, and avoid touching the inside of the mask during wearing the mask to minimize the possibility of the mask being contaminated. Masks should be divided into inside and outside, up and down. Disposable medical surgical mask with dark face outward and light face inward; One end of the metal strip (nose clip) is on it. Be sure to wash your hands after throwing away the mask.

Don't squeeze the mask by hand after wearing it. All kinds of masks, including N95 masks, can only isolate the virus on the mask surface. If you squeeze the mask with your hand and let the virus soak through the mask with droplets, you still have a chance to get infected with the virus.

4. No matter what type of mask, the protective effect is limited, and it needs to be replaced regularly, preferably every 2 to 4 hours. If it is used for a long time, the filtration efficiency will decrease and the respiratory resistance will increase due to large particles blocking the surface of the mask or ultrafine particles blocking the gap of the filter material of the mask.

People's Network-How to choose, wear and discard masks correctly?