Adult surgical mask 598

bluenon-woven3-ply

[gauge] binding type, ear hanging type [structure and composition]It is divided into three layers, with plastic nose clip, and the mask belt can be elastic or inelastic, which has the characteristics of low airflow resistance, synthetic blood barrier, filtering particulate matter and bacteria, and flame retardant. 1) appearance: the appearance of the mask should be clean and in good shape, without any damage or stains on the surface. 2) structure and size: after wearing the mask, it should cover the wearer's nose, mouth and jaw.The design size and tolerance of the mask should meet the requirements. 3) the nose clip 3.1) the mask must be equipped with a nose clip, which is made of plastic material. 3.2) the length of the nasal clip should not be less than 8.0cm. 4) mask band 4.1) the mask belt should be easily worn. 4.2) the breaking strength at the connection point between each mask belt and the mask body should not be less than 10N. 5) penetration of synthetic blood: after 2ml of synthetic blood is sprayed to the outer side of the mask at a pressure of 16.0kPa (120mmHg), no penetration should occur on the inner side of the mask. 6) filtration efficiency 6.1 bacterial filtration efficiency (BFE) : the bacterial filtration efficiency of masks should not be less than 95%. 6.2) particle filtration efficiency (PFE) : the filtration efficiency of mask for non-oily particles should not be less than 30% 7) pressure difference: the air exchange pressure difference between the two sides of the mask should be no more than 49Pa.