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Airborne emissions from carbon dioxide laser cutting operations.

Authors
Tharr-D
Source
Appl Occup Environ Hyg 1991 Aug; 6(8):652-654
NIOSHTIC No.
00201361
Abstract
The results of two NIOSH evaluations of airborne emissions generated by carbon-dioxide laser cutting operations were discussed. Area and personal air samples collected during carbon-dioxide laser cutting of fused quartz glassware, plastic, and metals at a scientific glassware manufacturing facility were analyzed for fused silica (7631869), trace metals, and organic vapors. Time weighted average (TWA) area and personal air fused silica concentrations were 0.5 and standard of 0.1mg/m3. Small quantities of chromium (7440473), copper (7440508), iron (7439896), nickel (7440020), or zinc (7440666) at concentrations just barely above the detection limit were measured. Ethyl-acrylate (140885) concentrations up to 149 parts per million (ppm) were detected when plexiglass, acrylic, and lucite were cut. The OSHA short term exposure limit for ethyl- acrylate is 25ppm. Two 2 hour area air samples contained 0.4 to 1.0ppm ethyl-acrylate. Ethyl-acrylate concentrations were high enough to cause nausea and irritative symptoms. A health hazard existed due to exposures from fused silica and ethyl-acrylate. The second study documented breathing zone exposures when cutting Kevlar, a lightweight organic composite material, with a carbon- dioxide laser. The laser technicians who performed the cutting operations complained of eye and skin irritation. Carbon-monoxide (630080) concentrations ranged up to 35ppm. TWA nitrogen oxides concentrations of around 5ppm were measured. Short term hydrogen- cyanide (74908) concentrations of 0.03 to 0.08mg/m3 were generated in the laser cutting area. This resulted in a TWA exposure of
Keywords
NIOSH-Author; Occupational-exposure; Plastics-industry; Laser-radiation; Cutting-tools; Glass-manufacturing-industry; Acrylates; Eye-irritants; Skin-irritants; Nitrogen-oxides
CODEN
AOEHE9
CAS No.
7631-86-9; 7440-47-3; 7440-50-8; 7439-89-6; 7440-02-0; 7440-66-6; 140-88-5; 630-08-0; 74-90-8
Publication Date
19910801
Document Type
Journal Article
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Issue of Publication
8
ISSN
1047-322X
Source Name
Applied Occupational and Environmental Hygiene
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