1 Scope
This standard specifies the classification and designation, technical requirements, mask testing methods, filter testing method, inspection rules and marking of non-powered air-purifying respirators.
This standard is applicable to the respirators based on the non-powered air-purifying principle.
This standard is not applicable to the respiratory protection equipment used in the anoxygenous environment, underwater operation, escape process and fire-fighting hotspot.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 2428-1998 Head-face dimensions of adults
GB 2626-2006 Respiratory protective equipment --non-powered air-purifying particle respirator
GB/T 5703-1999 Basic human body measurements for technological design
GB/T 10686-2006 Specifications for damp heat chambers
GB/T 10589-2008 Specifications for low temperature test chambers
GB/T 11158-2008 Specifications for high temperature test chambers
GB/T 12903-2008 Personal protective equipment terminology
GB 14866-2006 The specifications for personal eye-protectors
3 Terms
The following terms and definitions as well as those defined in GB/T 12903-2008 are applicable to this Standard.
3.1
Non-powered air-purifying respirator
It refers to the air-purifying protective equipment that relies on the wearer respiration to overcome the component resistance and prevent the toxic and harmful gas, vapor, particles (such as toxic smoke and toxic fog) and others damaging the respiratory system, eyes or face.
3.2
Full mask
It refers to the mask that can seal tightly to the face and cover eyes, face, nose, mouth and lower jaw.
3.3
Half mask
It refers to the mask that can seal tightly to the face and cover mouth and nose, or mouth, nose and lower jaw.
3.4
Protective time
It refers to the time required from the testing medium starting to enter the filter until the transmission concentration of testing medium reaching the limited value under specified conditions.
3.5
Filter
Cartridge
Canister
It refers to the filter assembly that is used in the non-powered air-purifying respirator and can filter the toxic and harmful substances in the inhalation air.
3.6
Inhalation valve
It refers to the one-way valve that only permits the inhalation air entering the mask but prevents the exhalation air being exhausted from the mask through it.
3.7
Exhalation valve
It refers to the one-way valve that only permits the exhalation air being exhausted from the mask but prevents the inhalation air entering the mask through it.
3.8
Inward leakage of mask
It refers to the ratio of simulant concentration leaked into the mask to the simulant concentration in the inhalation air where the testee inhales under specified conditions.
3.9
Dead space
The volume of air re-inhaled from the previous exhalation
Note: it shall be expressed by the volume fraction of carbon dioxide in the inhalation air.
3.10
Breathing hose
It refers to the air-tightness hose used for connecting mask and filter.
4 Classification and Designation
4.1 Non-powered air-purifying respirator
Non-powered air-purifying respirators may be divided into chest style respirator and chin style respirator according to the connecting modes of mask and filter.
4.2 Mask
Masks may be divided into full mask and half mask according to the structure.
4.3 Filter
4.3.1 Filter types
4.3.1.1 Ordinary filter
Ordinary filter includes:
a) Type A: for protecting against organic gas and vapor;
b) Type B: for protecting against inorganic gas or vapor;
c) Type E: for protecting against sulfur dioxide and other acid gases or vapor;
d) Type K: for protecting against ammonia and nitrogen organic derivatives;
e) Type CO: for protecting against carbon monoxide gas;
f) Type Hg: for protecting against mercurial vapor;
g) Type H2S: for protecting against hydrogen sulfide gas.
4.3.1.2 Multi-functional filter
For protecting two types or more in Article 4.3.1.1
4.3.1.3 Composite filter
Ordinary filter with smoke filtering function or multi-functional filter
4.3.1.4 Special filter
For protecting against the gases or vapor not specified in this standard but designated by the manufacturer
