CARBO conducts industrial hygiene study
10 Nov 2017
Evaluation on the degree of employee exposure to respirable crystalline silica (RCS) concludes no detectible level of RCS.
In addition to an earlier Industrial Hygiene (IH) study conducted at the CARBO Eufaula, Alabama facility, CARBO conducted the same IH study at its Toomsboro, Georgia facility earlier this month to evaluate the degree of employee exposure to respirable crystalline silica (RCS) experienced during handling of ceramic pellets/media.
Summary of study and results
Of the samples collected, all test results showed concentrations below the minimum detection level (MDL), settling between 5-8 μg/m3, or ~90% less than the new OSHA PEL of 50 μg/m3.
- Laboratory analysis of all personal area and bulk samples across all CARBO sites confirmed that RCS, assessed as total silica and including all crystalline species (quartz, cristobalite and tridymite), was not present at detectible levels.
- The pellet handling conditions were chosen to replicate the conditions and equipment experienced by our customers during handling of ceramic media, including effects of conveying, screening, abrasion, among others.
- Samples of dust were obtained from final sintered ceramic product as well as “green” (i.e. unfired) pellets.
- Techniques included collection of samples using personal sampling pumps & collection media to assess direct employee exposures over an 8-hour period, as well as stationary area sampling and direct samples of bulk material.
- The studies were conducted at multiple CARBO plant locations following standard industrial hygiene and laboratory analytical protocols over a two-year period.
- Analysis of all collected samples were conducted by independent laboratories with accreditation by the American Industrial Hygiene Association (AIHA).
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