Protection against respirable crystalline silica: a focus on coveralls

杜邦人身保护

杜邦人身保护
Wednesday, 14 July, 2021


Protection against respirable crystalline silica: a focus on coveralls

必须使用控制层的层次结构来管理风险和工人暴露于危险的细颗粒(如可通道的晶体二氧化硅(RC))。从这个层次结构中,个人防护设备(PPE)是工作地点的最后一条防线。将灰尘颗粒渗透到工作服下面的服装的保护层至关重要。

Silica is silicon dioxide, which is a naturally occurring mineral that forms the major part of many rocks and soils (granite, shale, sandstone, sand). It’s also used to make concrete, mortar and composite stones. Composite stones are often used to fabricate benchtops for kitchens and bathrooms, as well as other products. When workers fabricate these products (cut, saw, grind, drill, polish, etc), very small silica dust particles are generated, and become airborne.

From 1 July, the workplace exposure standard (WES) for RCS reduced by half in six Australian jurisdictions: the Australian Capital Territory, New South Wales, the Northern Territory, Queensland, South Australia and the Commonwealth. The move followed the reduction in the WES for RCS under the model Work Health and Safety (WHS) laws, and came after the implementation of the updated WES in the Victorian jurisdiction in December of last year.

RC的WES从八个小时的平均平均值为0.1毫克(mg/m)一半(mg/m)3)至0.05 mg/m3根据《 2011年工作健康与安全法规》,但仍必须使用控制层的层次来管理对RCS等危险精细颗粒的风险和工人接触。

How particle sizes affect compliance efforts

One of the more dangerous traits of RCS is the extremely small particle size, which allows them to flow when airborne, and travel on air turbulence (even indoors), for long periods of time. According to the National Institute of Environmental Health Services, the size of dust emissions from silica containing substances varies from 0.01 μm (micrometres) to 100 μm in diameter. For perspective, the diameter of the average human hair is about 70–100 μm.

根据其重量,灰尘颗粒通常必须为200μm或较小,以使空气传播和持续,而50μm和较小的颗粒对于肉眼看不见。颗粒物≤10μm(PM10)是颗粒能够穿透人体自然防御剂(粘膜,纤毛等)并深入肺部的大约尺寸阈值,可能会导致严重的健康问题,例如硅化病。

使用控件的层次结构管理风险和工人接触二氧化硅

根据模型WHS法规,可以通过使用控制的层次来选择和实施措施来实现风险和工人对二氧化硅的接触。通常需要多个控制才能充分保护工人,这些控制如下:

  • 替代 - 例如采购二氧化硅百分比较低的复合石台面。
  • 隔离危险 - 使用安全工作设计的原理来指定在这些任务期间在这些任务期间产生灰尘和适当工人定位的任务区域,并使用外壳和自动化来执行灰尘生成任务。ManBetX万博app下载
  • 工程控制 - 最大程度地减少了暴露于产生的灰尘的风险,例如局部排气通风,抑制水(湿切割)或使用带有灰尘收集附件的工具。
  • 一种dministrative controls — including good housekeeping policies, shift rotations and modifying cutting sequences.
  • PPE— including appropriate respiratory equipment and工作服装,不收集灰尘

不收集灰尘的衣服:专注于保护性的工作岗位和标准

法规要求处理危险颗粒的一次性防护工作地符合EN 13982-1类型5标准。但是,作为总泄漏(til)一种) allowed under this standard is very high (15% in 8 out of 10 suits tested); the more stringent standard of EN 1073-2 Class 2 is desirable, as this requires the Average TIL一种对6套套件的少于2%。

Workers using coveralls that meet the EN 13982-1 Type 5 Standard may be unaware that up to 15% of the hazardous fine particles may be entering inside the suit. If appropriate decontamination procedures are not implemented, this can lead to secondary inhalation of silica particles by the worker and family members, if contaminated garments worn under the disposable coveralls are worn home.

Workers can reduce the risk of exposure to silica by wearing disposable coveralls that have a lower Average TIL一种。具有疏散人体水分的能力,同时仍然提供出色的颗粒固定的能力,将为舒适度和保护二氧化硅,石棉和其他细颗粒危害提供理想的平衡。

Image credit: ©DuPont Personal Protection

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