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Mask test reports come in several types: reports against Chinese national standards, against international standards and against industry standards. Different products and different countries or regions require different standards; in China the common standards for masks are GB 2626-2019, GB 19083-2010 and GB/T 32610-2016. A mask test report records the testing of function, performance and appearance against the corresponding standard and can be used to demonstrate that a mask conforms. A laboratory accredited by the China National Accreditation Service for Conformity Assessment (CNAS) may issue reports bearing the CNAS mark.