1. Suitable for working environment where sulfur dioxide and other acid gases or vapors are present.

2. The mask can be closely combined with the face, and the fixing system can be adjusted as needed.

3. The mask material is made of high-grade silicone, non-toxic, odorless, non-irritating to the skin, and has excellent skin-friendly.

4. Inhalation resistance of mask: ≤15Pa;

5. Mask leakage rate: ≤1.3%;

6. Mask exhalation valve resistance: ≤35Pa

7. Quality of filter: ≤151g 8. Ventilation resistance of filter: ≤26Pa when the test flow rate is (15 ± 0.6L) L / min, and the test flow rate is (47.5 ± 4) L / min≤100Pa.