Quesnel L B
Br J Surg. 1975 Dec;62(12):936-40. doi: 10.1002/bjs.1800621203.
Five different types of surgical mask of varying design and composition of natural and synthetic fibres were tested for their efficiency in vivo by means of a special test chamber. Contaminated particles escaping through or around the mask during speech by the wearer could be collected and sized. Analysis of the data showed that the gross efficiency of all the masks was high, but that some masks were distinctly better at small particle 'filtration' than others. There was a significant difference in efficiency between the best and worst masks. The best masks contained more fabric, were softer and were pleated, while the worst were stiffer, smaller and not pleated. Reusable cotton fabric masks were as effective as synthetic fabric masks when made to a good design.
通过一个特殊的测试腔，对五种不同设计、由天然和合成纤维制成的手术口罩进行了体内效率测试。佩戴者说话时从口罩中或周围逸出的污染颗粒可以被收集并测量大小。数据分析表明，所有口罩的总体效率都很高，但有些口罩在小颗粒“过滤”方面明显优于其他口罩。最佳和最差口罩之间的效率存在显著差异。最佳口罩布料更多、更柔软且有褶皱，而最差的口罩更硬、更小且没有褶皱。设计良好的可重复使用棉质口罩与合成纤维口罩效果一样好。
