Material: High quality silicone
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;
PC window anti fog inside and anti friction outside;
The threaded interface is very convenient for replace cartrideges;
Conforms to EN136: 1998 & GB2890-2009 standards.
Specifications as below:
A, Leakage Coefficient: ≤ 0.05% at 30 1/min;
B, Inhalation Resistance(Pa): ≤ 50 Pa at 30 1/min;
C, Exhalation Resistance(Pa): ≤ 100 Pa at 30 1/min;
D, The effective field of Vision: ≥ 70%;
E, The overlaped field of Vision: ≥ 80%.