he mask has good rebound, strong sealing, no deformation, anti-aging, no fading, corrosion resistance, high and low temperature resistance. The normal service life of the silicone mask is more than 1 year, which makes the use cost lower. The blocking and rapid emptying of the one-way valve prevents secondary pollution to the inside of the mask with the exhaling gas of the user. Effectively extend the service life of the filter element; greatly reduce the comprehensive combined use cost of consumers.
March 1st 2020