Feature:1. SUITABLE FOR FACE COVER: 5N11 thick cotton filter is suitable for various respirator sizes and is compatible with 6200, 6800 and 7502 face shield.2. APPLICATION: This filter can filter particulate dust, seasonal allergy, pollution, ashes, gardening pollen, assembly and machinery, chemical cleaning, chemical treatment, grinding, laboratory, processing and coloring.3. REPLACEMENT: When you feel it difficult to breath, and feel uncomfortable, or the filter dust is dirty or damaged, the filter cotton needs to be replaced.4. HEALTH PROTECTION: As long as you smell something harmful, leave the work area immediately, and then go to a safe place to replace the organic steam filter core.5. USE FOR TIME: Each dustproof thicken respirator filter cotton can provide 8 hours of protection, it needs to be replaced after this time, there is no bad influence on your health.Specification:Item Type: Dustproof filter cotton Material: Superfine fiberQuantity: 20pcs.Package List:20 xRespirator FiltersNote:It is recommended to use in the environment containing some non oil based particles. Effective filtration 95%. This filter cannot produce oxygen, and should not be used when the oxygen concentration is lower than 19.5%.