In addition to medical protective masks and daily protective masks, there are also disposable protective masks, knitted masks, mask paper and other products that we come into contact with in our daily lives. Here, we mainly talk about the testing of knitted masks (FZ/T 73049-2014) for fighting. Knitted masks are a type of mask that can filter some dust and have certain decorative properties. Compared to civilian disposable masks and medical masks, their biggest difference is that they do not have a melt blown fabric filter layer. Fabric masks are a common type of knitted masks. The Ministry of Industry and Information Technology of the People's Republic of China issued the FZ/T "Knitted Mask" standard on October 14, 2014, to regulate the knitted mask market and officially implemented it on April 1, 2015. 1. Test items: fiber content # 1, formaldehyde content, pH value, decomposable aromatic amine dyes, odor, color fastness to friction, color fastness to sweat, color fastness to water, color fastness to soap washing, air permeability, etc. 2. Test standards: AQ 1114-2014 self suction filter dust mask for coal mines BS EN 138-1994 Respiratory protection device, and full face mask Specification for fresh air hose breathing apparatus for use with half masks or masks - BS EN 140-1999 Respiratory organ protective devices - Half masks and quarter masks - Requirements, testing and marking - BS EN 402-2003 Escape respiratory protective devices - Requirements, testing, and marking for self installed open circuit compressed air breathing apparatus with full face masks or mask accessories BS EN 404-2005 Self rescue respiratory protective devices - Carbon monoxide resistant self rescue respirators with mask components - Compressed air vital capacity automata with full face masks or masks for escape - Requirements, testing, marking EN 404-2005 Self rescue respirators - Carbon monoxide resistant self rescue filters - DIN EN 402-2003 Respiratory protective devices - Compressed air vital capacity automata with full face masks or masks for escape - Requirements Inspection and marking: DIN EN 404-2005 self rescue respirator, carbon monoxide mask type self rescue filter, FZ/T 73049-2014, knitted mask, 3 specifications. The main specifications of the knitted mask are expressed as: length × Width, where both length and width are expressed in centimeters. Requirement 4.1: The content requirements are pided into internal quality and external quality. The internal quality includes indicators such as pH value, formaldehyde content, odor, decomposable carcinogenic aromatic amine dyes, fiber content, color fastness to soap washing, color fastness to water, color fastness to saliva, color fastness to friction, color fastness to sweat stains, and air permeability; The appearance quality includes indicators such as surface defects and sewing regulations. 4.2 Grading Regulations 4.2.1 Quality grades are only classified as qualified products. 4.2.2 Internal quality is evaluated based on criticism, and external quality is evaluated based on parts. Both must meet the specified requirements. 4.3 Internal quality requirements 4.4 Appearance quality requirements 4.4.1 Surface defect requirements 4.4.2 Sewing regulations 4.4.2.1 Suitable tightness of all parts of the thread, ensuring that the thread does not come off, break, or leak after stretching. 4.4.2.2 The loop is sewn firmly and has a suitable length. 5 Test 5.1 Internal Quality Inspection 5.1.1 Test Preparation and Test Conditions The samples taken shall not have any defects that affect the test. 5.1.2 Test method 5.1.2.1 The pH value test shall be carried out in accordance with the provisions of GB/T 7573. 5.1.2.2 The formaldehyde content test shall be carried out in accordance with the provisions of GB/T 2912.1. 5.1.2.3 The odor test shall be carried out in accordance with the provisions of GB 18401. 5.1.2.4 The test for decomposable carcinogenic aromatic amine dyes shall be carried out in accordance with the provisions of GB/T 17592. 5.1.2.5 The fiber content test shall be carried out in accordance with the provisions of GB/T 2910, FZ/T 01026, FZ/T 01057, and FZ/T 01095. Combined with the calculation of the public moisture regain, the public moisture regain shall be carried out in accordance with the provisions of GB 994

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