KMN Participates In The Development Of Group Standards For Protective Masks

KMN Participates In The Development Of Group Standards For Protective Masks

 

一、The structure and scope of the standard

This Standard specifies the terms and definitions, requirements, test methods, inspection rules and classification, labeling, packaging, transportation and storage of daily protective masks. This standard is applicable to non-woven cloth or fabric as raw materials, used in daily life to filter dust, pollen, catkins, bacterial particles and barriers to nasal or oral exhalation or spray pollutants such as respirators.

 

This standard does not apply to respiratory protective equipment for special industries such as anoxic environment, underwater operation, escape, fire fighting, medical and industrial use. This standard does not apply to mask products for infants and young children under 36 months of age.

 

二、Discussion on main technical indexes, parameters and test verification

 

1. Terms and definitions

 

This section stipulates the terms and definitions of particulate filtration efficiency, bacterial filtration efficiency, masks for children and masks for the elderly.

 

Respirators for children and respirators for the elderly are characteristic of this Standard. This section defines the two respirators.

 

2. Classification and specification

 

According to the structure type, it can be divided into planar masks and folded masks. According to the age of the wearer, masks are divided into adult masks, children masks and elderly masks. According to the product filtration level, it is divided into level 1, level 2 and level 3; According to the size of the mask, the size is divided into large, medium and small.

 

This section specifies the specifications of masks for civilian use, which are classified according to the age of the wearer, filtration efficiency, size and so on.

 

3.  Requirements

 

(1) Basic requirements

Meet the basic requirements of GB/T 32610-5.1 2016.

 

(2) Appearance, dimension deviation and nose clip

The appearance of the mask should be clean and in good shape, and the surface should not be damaged or stained. Nose clips should be made of plastic material. After wearing the mask, it should cover the wearer's mouth, nose and jaw. Should conform to the design size, the maximum deviation should not exceed ±5%. The folding ratio of planar disposable masks is not less than 50%.

 

(3) Internal quality

This section specifies the technical requirements for the length of the nose clip, the breaking strength at the junction between the mask belt and the mask body, ventilation resistance, pH value, formaldehyde content, decompenable carcinogenic aromatic amine dye, color fastness to friction, color fastness to saliva, and residual amount of ethylene oxide.

 

(4) Microbial indexes

This part stipulates the technical requirements for the total number of coliforms, pathogenic suppurative bacteria, fungal colonies and bacterial colonies, among which the coliforms and pathogenic suppurative bacteria shall not be detected.

 

(5) Filtering level

The filtration level is divided into first, second and third levels. The corresponding indexes of each level are: bacterial filtration efficiency is 95%, 95% and 99% respectively; particulate filtration efficiency (non-oily) is 50%, 85% and 95% respectively.

 

4. Test methods

Appearance: 10 samples were randomly selected for testing. Visual inspection, fluorescent lamp illumination is not less than 400 LX.

 

Structure and size: 10 samples were randomly selected for testing. Wear the mask and measure the length and width of the mask with a general or special measuring tool with an accuracy of 0.1cm.

 

Nose clip: 3 samples were randomly selected for the test, the material of the nose clip was checked, and the hand was tried bending. The nose clip was taken out, and the length of the nose clip was measured with a general or special measuring tool, with an accuracy of 0.1cm.

 

The filtration efficiency of bacteria, the breaking strength at the connection between the mask band and the mask body, ventilation resistance, pH value, formaldehyde content, carcinogenic aromatic amine dyes that can be decomposed, color fastness to friction and residual ethylene oxide shall be implemented according to the provisions of GB/T 32610-2016.

 

5. Inspection rules

According to the delivery batch number of the same variety, the same specification (model) of the products as the inspection batch. Randomly select a corresponding number of samples from each inspection batch according to the test requirements. Delivery inspection items include appearance quality, structure size, nose clip and mask band.

 

6. Identifying

The minimum package of masks shall be clearly marked in Chinese and shall include at least the following information:

 

Product name, main raw materials, specifications and sizes, production date, manufacturer's name, production address and date, implementation standards, storage conditions.

 

7. Packaging, storage and transportation

Masks should be packaged to prevent mechanical damage and contamination prior to use. The outer packing shall not be damaged in transportation to prevent rain and sunshine. Storage shall be carried out in accordance with the storage conditions specified in the label.



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