口罩预处理，口罩预测，口罩测试，口罩CE，口罩GB2626-2019,口罩GB报告

EN149标准口罩预处理标准/EN149标准口罩预处理方法/NB公告号机构29家发证机构测试方法
根据欧盟口罩EN149标准要求，FFP1/FFP2/FFP3防护效果等级，预处理方法：HIGH TEMPERATURE FOR 24H（高温）70±3℃ 24小时；LOW TMEPERATURE FOR 24H（低温）-30±3℃ 24小时，AND ALLOW TO RETURN TO ROOM TEMPERATURE FOR AT LEAST 4 HOURS BETWEEN EXPOSURES AND PRIOR TO SUBSEQUENT TESTING(放置4小时恢复室温）
从测试结果分析，预处理后的样品参数会发生如下变化：
A. 呼气吸气阻力 增大10-80pa
B. DOP油性颗粒物过滤0.3um值下降 0.5-3 %
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Good afternoon everyone !
Wish you a nice and happy day today !
Please take good care of your self and your families and your friends and saty safe during the epidemic situation !Taking protective measures to keep awayfrom the virus !
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Thanks and best regards !
Tila
大家下午好！
祝你们度过开心快乐的一天！
在疫情期间，请照顾好你自己、你的家人和朋友，并注意安全！采取保护措施远离病毒！
如果你想订购一些Kn95一次性民用非医用防护口罩，请随时和我联系！
谢谢和最美好的祝愿！
Tila

Good afternoon everybody!
Now the COVID-19 is still not over,in order to meet the needs of more people，our company is trying our best to invest much more cost to manufacture KN95 disposable civil protective face mask. we possess the certification to manufacture KN95 disposable civil protective face mask ,so we can definitely be trusted in quality.if you need to order our face mask ,plz contact with me !
Thank you so much !
Best regards!
大家下午好！
现在COVID-19疫情还没有结束，为了满足更多人的需求，我们公司正在尽最大努力投入更多的成本来生产KN95一次性防护口罩，我们有生产KN95一次性民用防护口罩的资格证明，所以在质量方面可以绝对相信我们！如果您需要订购我们的口罩，请与我联系！
非常感谢！
致以最诚挚的问候！