Panorama Face Mask

Materials: high quality silicone
Description: 
1.The main body is using the high quality silicone which is anti-aging, anti-allergic and easy to 
clean. The double silicone mask edge is very good for air tightness, parts of mouth and nose
can fit various face;
2.PC window is big , anti fog inside and anti friction outside;
3.The threaded interface is very convenient for replace cartridges;
4.Conforms to EN 136:1998,GB2890-2009 standards.

Specifications as below:
a. Leakage Coefficient: ≤0.05% at 30 L/min
b. Inhalation Resistance（Pa）: ≤50 Pa at 30 L/min
c. Exhalation Resistance（Pa）: ≤100 Pa at 30 L/min
d. The effective field of Vision: ≥70%
e. The overlapped field of Vision: ≥80%