GB/T 2891-1995 in English

《GB/T 2891-1995过滤式防毒面具面罩性能试验方法》由TC112（全国个体防护装备标准化技术委员会）归口，主管部门为应急管理部。
本标准规定了过滤式防毒面具的佩戴漏气系数、实际死腔、视野、装配气密性、呼气阀气密性、呼气阀对空气阻力、镜片透光率(透光比)及面罩吸气阻力等性能试验方法。本标准适用于过滤式防毒面具面罩性能的测试和评价，其他有关产品亦可参照。

Performance test methods for facepiece of filter type respirator

1 Subject content and application scope

This standard specifies the performance test methods for wearing leakage coefficient, effective dead space, visual field, assembly airtightness, outlet valve airtightness, air resistance of outlet valve, light transmittance (light transmittance ratio) of spectacle lens and inspiratory resistance of facepiece of filter type respirator.

This standard is applicable to the performance test and evaluation of facepiece of filter type respirator (hereinafter referred to as "facepiece"), and may also be referred to for other related products.

2 Normative references

GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties
GB 2410 Determination of the luminous transmittance and haze of transparent plastics
GB 2428 Head configurations - Chinese adults

3 Technical contents

3.1 Test method for wearing leakage coefficient of facepiece (oil mist method)

3.1.1 Principle

When a person is wearing the respirator, the ratio of the concentration c of hazardous substances leaking into the facepiece through the tight-fitting frame, outlet valve and parts assembly positions of facepiece to the external concentration c0 of the same is called the leakage coefficient of facepiece, expressed in percentage (%).

1 Subject content and application scope
2 Normative references
3 Technical contents