ASBESTOS FIBER COLLECTION BY NIOSH-APPROVED RESPIRATORS

由 NIOSH 批准的呼吸器收集石棉纤维

• 批准号: 3420383
• 负责人: JOHN S EVANS
• 金额: $ 4.93万
• 依托单位: HARVARD MEDICAL SCHOOL
• 依托单位国家: 美国
• 财政年份: 1986
• 资助国家: 美国
• 起止时间: 1986-01-01 至 1988-12-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3420383
• 关键词: air filtration; asbestos; disease /disorder prevention /control; dust; health related legal; industry; lung neoplasms; occupational disease /disorder; occupational hazard; pneumoconiosis; scanning electron microscopy

The goal of this research is to use an asbestos aerosol to investigate the performance of respirators certified for use with asbestos. A representative sample of certified air-purifying respirators will be tested. Since asbestos is a very hazardous material, and since such respirators are widely used to protect workers from asbestos exposure, it is very important that certified respirators perform as expected. Unfortunately, the present NIOSH certification procedure does not require that respirators be tested against asbestos. It is the goal of this research to investigate the significance of this and other possible deficiencies in the certification procedure. The performance of the respirators against asbestos will be compared to that for silica, the standard dust used in the NIOSH certification procedure. Respirator penetration will be measured under steady flow conditions, as is done in the certification test, and under cyclic flow, to simulate actual use conditions. Three replicate tests will be performed for each combination of test aerosol and flow pattern, so that twelve tests will be performed for each respirator. The measurements will be analyzed by standard statistical techniques, including analysis of variance, to give the effects on performance of aerosol type, flow pattern, and respirator model. In addition, exploratory tests will be performed to assess the effects of high dust loading and elevated temperature and humidity on respirator performance, to compare penetration as measured by phase contrast and scanning electron microscopy, and to compare the performance of powered and non-powered air-purifying respirators.

本研究的目的是使用石棉气溶胶来调查 经认证可与石棉一起使用的除湿器的性能。 一 经认证的空气净化器的代表性样品将 测试. 由于石棉是一种非常危险的材料， 石棉板被广泛用于保护工人免受石棉暴露， 认证的制冷剂按预期运行非常重要。 不幸的是，目前的NIOSH认证程序不要求 对净化器进行石棉测试。 这是我们的目标 研究调查这一点和其他可能的意义 认证程序的缺陷。 对石棉的性能进行比较， 对于二氧化硅，NIOSH认证中使用的标准粉尘 procedure. 将在稳定气流下测量呼吸器穿透 条件下，如认证试验中所做的那样，并在循环流动下， 模拟实际使用条件。 将进行三次重复检测 对于测试气溶胶和流型的每种组合， 将对每个呼吸器执行。 将对测量结果进行分析 通过标准统计技术，包括方差分析， 气溶胶类型、流型和呼吸器对性能的影响 模型 此外，将进行探索性试验，以评估 高粉尘含量以及温度和湿度升高对 呼吸器性能，以比较按阶段测量的穿透性 对比和扫描电子显微镜，并比较性能 有动力和无动力的空气净化器。