**, use ultra-fine glass fibers or chemical fibers, fibers as fine as about 0.2 microns, to make a non-woven filter membrane, similar to making paper or marshmallows, clean room FFU filter membrane The strength is very good, not easy to break, stronger than toilet paper.
This kind of filter membrane may have tens of thousands or even hundreds of thousands of silk threads per square centimeter, criss-crossing it, which makes it extremely difficult for PM2.5 to pass through the fibers, but the air can Come and go freely.
This will bring great convenience to intercepting and filtering PM2.5.
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