Interpretation of key quality indicators of masks (2) ——FormaldehydeInterpretation of key quality indicators of masks (2) ——Formaldehyde
Speaking of formaldehyde, everyone will definitely be familiar with it. When the home is renovated, we will worry about the excessive formaldehyde in paint and home; when we buy a new car, we will worry about the excessive formaldehyde in the car; when we buy a toy for our children, we will worry about the excessive formaldehyde of the toy ... During the epidemic prevention and control period, the masks we often use also have formaldehyde limits. Therefore, I hope that through the interpretation of the formaldehyde index in the mask, we can better understand the quality-related indicators contained in the mask and choose the mask that suits our actual needs.
1. Does the mask contain formaldehyde?
There are many kinds of masks on the market, and in order to meet the needs of different people, many masks have added a variety of colors. The materials used in masks are textiles. In textile production, in order to improve the performance of fabrics, a variety of additives or dyes are often added, and these additives contain formaldehyde. These additives containing formaldehyde will still have residues after processing, which may pollute the environment and affect human health.
GB 18401-2010 "National Textile Basic Safety Technical Specifications" was formally implemented on August 1, 2018, and replaced the mandatory standard GB 18401-2003. The basic safety technical requirements of textiles are divided into categories A, B, and C (corresponding to three types of infants, children, direct skin contact, and indirect skin contact) according to the index requirements. , 75 mg / kg, 300 mg / kg.
2. Formaldehyde index of commonly used masks
Table 1 lists the formaldehyde limit values of different masks. GB / T 32610 "Daily protective masks" and "Guidelines for the production of emergency protective civil masks in Zhejiang Province (provisional)" has a formaldehyde content of ≤20 mg / Kg, of which the formaldehyde limit requirements are the same as those in GB 18401-2010 Class A (infants and young children) The indicator requirements are the same. Therefore, when choosing materials for masks, you should choose better and safer materials. Poor quality materials are likely to fail formaldehyde.
Indicators Zhejiang Province Emergency Protection Civil Mask Production Guide (Provisional)
GB / T 32610
Daily protective mouth
Hood technical specifications
YY / T 0969
Medical surgical mask
GB / 19083
Medical protective mask
Formaldehyde content (mg / kg) ≤20 ≤20 No No No
(Primary stimulation score
None None Should not be greater than 0.4 Should not be greater than 0.4 Should not exceed 1
Cytotoxicity None None Should not be greater than level 2 Should not be greater than level 2 None
Delayed hypersensitivity reactions None None Should not be greater than level 1 There should be no sensitization reactions None
The guide document of Zhejiang Provincial Emergency Protection Civil Mask Production (Provisional) is a guide document that the Zhejiang Provincial Department of Economics and Information Technology meets the daily protection of adults during the response to the new coronavirus, and is only applicable during this epidemic. From the comparison in Table 1, we may be puzzled because the three medical-related masks YY / T 0969, YY 0469, and GB 19083 do not have a formaldehyde index, so have they lowered the index requirements? In fact, from Table 1, we can see that although the latter three mask standards do not have formaldehyde indicators, they have more skin irritation, cytotoxicity, delayed hypersensitivity and other indicators than daily protective masks. These indicators of medical masks are to evaluate the impact of mask materials on the human body from a biological evaluation point of view, so as to ensure the safety of different masks in different environments.