04 classes include:
02 layers of non-woven fabric against bacterial droplets
01 layer of silver nano antibacterial fabric
01 layer of ultrafiltration paper
QUALITY STANDARDS
ISO 13485: 2016 quality: Quality standards for medical products
TCVN 8389-2: 2010: Vietnamese national standards on medical masks
CE: mandatory certificate for goods imported into the European market
FDA: Certificate required for goods entering the US market
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