KN95 mask is made of high-grade non-woven fabric. There are multiple filter layers (activated carbon, melt-blown cloth, cotton filter, etc.) under the outer layer of the breathable shell. And smoke.
NEMA 8micro stepper motorStep Angle 0.9°/1.8°(0.6°/1.2°)Step Angle Ettor 5% Temperature rise 80°C Max Service Environment Temperature -20°C~+50°CService Environment Humidity <85%RH Insulation Resistance 100MΩ Min 500VDCInsulation Dielectric Strength 600V