美国织物口罩布艺口罩AATCC M14美标检测 美国N95防护口罩 42 CFR Part84检测
AATCC M14 是2020年7月组织研讨发布的 新美标
关于 布艺口罩, 一般织物口罩 和 普通社区口罩面罩 的标准指南！
此标准同时参考了
欧盟医用口罩 - EN14683
美国N95防护口罩 - 42 CFR Part 84.181
欧盟社区口罩 - ISO9327 等测试方法
核心要求:
织物面罩应满足至少70%颗粒过滤效率的要求，且其呼吸阻力不得超过方法中规定的上限。
测试内容：
* 合体性和尺寸
* 材料和构造
* 颗粒物过滤效率
* 呼吸阻力
* 洗涤护理和使用寿命
* 头带和耳带
* 产品标签和标记
技术参数:
Perform one of the following test methods on the materialassembly. It is not necessary to evaluate the air permeability ofindividual layers in a multi-layer assembly.
1. EN 14683 (Annex C) using 8 L/min air flow, with standarddiameter of 25 mm.
2. ASTM D737 using a standard 125 Pa pressure drop. Use thestandard 38.3 cm2 test area.
3. ISO 9237 using a standard 100Pa pressure differential
The following air permeability values are recommended for facecoverings:
For EN 14683 (Annex C), a maximum of 36.7 Pa/cm2.
For ASTM D737, a minimum of 37.5 ft3/min/ft2 (1.14L/min/cm2).
For ISO 9237, a minimum of 0.91 l/min/cm2 (or 15 cm/s).
Test additional specimens after multiple laundering cycles (seeLaundering and Care Considerations). Do not retest the samespecimens.
Air permeability is measured on the fabric only. While this testindicates the potential for the fabric to be effectively used in aface covering, construction, printing, and other processes may alsoimpact the breathing resistance of the finished face covering.
