1.Material: polycarbonate

2. Muzzle mask material: food-grade silica gel

3. Face mask material: medical grade silicone

4. Mask respirator valve: when the respirator valve depressurizes to -1180pa, the negative pressure value within 45s of the overall mask respirator valve drops to ≤500Pa or less.

5. Overall hood leakage rate: the overall hood leakage rate is 0.02%

6. Inhalation resistance of mask: ≤40Pa, exhalation valve resistance of mask: ≤100Pa

7. Total visual field: total visual field is ≥70% and binocular visual field is ≥ 55%

                                  Lower visual field ≥35°  oil mist transmittance ≤0.005

8.Mask leakage coefficient is less than or equal to 0.005%

9.Bonding strength of mask and filter: no obvious damage at 250N

10.Inspection basis: gb2890-2009 respiratory protective self-suction filter gas mask