BS 7356:1990

National foreword
Brief history
Text of EN 140
Specification
1. Object and field of application
2. References
3. Definition and description
4. Requirements
5. Testing
6. Marking
7. Instructions for use
Annex
A. Recommended test procedure for exhalation valve
    leakage
Table
1. Summary of tests
Figures
1. Basket and hopper, rubber chippings
2. Facial dimensions
3. Filter simulator for standard thread filters/half
    masks or quarter masks
4. Scheme of the SF6-test rig for inward leakage
5. Assembly of atomizer
6. Apparatus used in the determination of inward
    leakage using sodium chloride
7. Dummy head (Sheffield head) for carbon dioxide
    content test of the inhalation air (dead space)
    for a half mask or a quarter mask
8. Scheme of test rig for carbon dioxide content of
    the inhalation air
9. Test arrangement for tensile force
10. Apertometer
11. Diagram of the apertometer
12. Scheme of exhalation valve leakage test box
13. Scheme of test rig for valve leakage using a single
    cylinder machine
14. Scheme of test rig for valve leakage using a twin
    cylinder breathing machine
National appendix A
National appendix B
Cooperating organizations

Performance and marking requirements.