Occupational exposure to crystalline silica in artificial stone processing

Area of Science:

• Occupational Health
• Industrial Hygiene
• Materials Science

Background:

• Respirable Crystalline Silica (RCS) poses significant health risks, with exposure levels historically high in sectors like construction and stone processing.
• Recent years have seen increased concern regarding RCS exposure in the artificial stone processing industry.

Purpose of the Study:

• To evaluate Respirable Crystalline Silica (RCS) exposure levels in artificial stone production facilities.
• To assess the effectiveness of implemented preventive technical measures, including wet processing and local exhaust ventilation.

Main Methods:

• The study involved 51 subjects across four artificial stone production facilities.
• Personal silica exposure was assessed using GS3 cyclones in the breathing zone.
• Quantitative silica determination was performed using X-ray diffraction analysis.

Main Results:

• Respirable dust levels ranged from 0.046-1.154 mg/m³.
• Respirable Crystalline Silica (RCS) levels were measured between <0.003-0.098 mg/m³.
• Dry finishing operations exhibited the highest exposure levels.

Conclusions:

• Preventive measures have led to a notable reduction in RCS exposure compared to previous levels.
• Despite reductions, some monitored activities still present hazardous exposure levels to workers.
• Further attention to controlling RCS exposure in specific operations like dry finishing is warranted.