N95 Mask এ রুপান্তর করুন আপনার Ordinary সাধারণ Mask টাকে - Joy D. Biswas ✌✌™

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Thursday, May 21, 2020

N95 Mask এ রুপান্তর করুন আপনার Ordinary সাধারণ Mask টাকে


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Compliance standards for N95 respirators
N95 respirators are commonly used in construction and other industrial enterprises that expose wearers to dust and smoke. Some are only intended for use in a health care setting. One of the key differences is that N95 respirators need to filter out at least 95% of airborne particles and have to be thoroughly evaluated, tested, and approved before being used by medical professionals.
Like surgical masks, respirators also consist of multiple layers. The outer layer is constructed of a protective nonwoven fabric between 20-50 gsm density. This is followed by a pre-filtration layer 250 gsm thick and finally, a melt-blown electret nonwoven material.
The needled nonwoven fabric is produced through hot calendaring, where plastic fibers are thermally bonded together, helping the mask keep its shape.

Completed respirators are sterilized before use.





Centers for Disease Control and Prevention (CDC) USA







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