Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Airborne nanoparticle concentrations in the manufacturing of polytetrafluoroethylene (PTFE) apparel.

Authors
Vosburgh-DJH; Boysen-DA; Oleson-JJ; Peters-TM
Source
J Occup Environ Hyg 2011 Mar; 8(3):139-146
NIOSHTIC No.
20038607
Abstract
One form of waterproof, breathable apparel is manufactured from polytetrafluoroethylene (PTFE) membrane laminated fabric using a specific process to seal seams that have been sewn with traditional techniques. The sealing process involves applying waterproof tape to the seam by feeding the seam through two rollers while applying hot air (600 degrees C). This study addressed the potential for exposure to particulate matter from this sealing process by characterizing airborne particles in a facility that produces more than 1000 lightweight PTFE rain jackets per day. Aerosol concentrations throughout the facility were mapped, breathing zone concentrations were measured, and hoods used to ventilate the seam sealing operation were evaluated. The geometric mean (GM) particle number concentrations were substantially greater in the sewing and sealing areas (67,000 and 188,000 particles cm-3) compared with that measured in the office area (12,100 particles cm-3). Respirable mass concentrations were negligible throughout the facility (GM = 0.002 mg m-3 in the sewing and sealing areas). The particles exiting the final discharge of the facility's ventilation system were dominated by nanoparticles (number median diameter = 25 nm; geometric standard deviation of 1.39). The breathing zone particle number concentrations of the workers who sealed the sewn seams were highly variable and significantly greater when sealing seams than when conducting other tasks (p < 0.0001). The sealing workers' breathing zone concentrations ranged from 147,000 particles cm-3 to 798,000 particles cm-3, and their seam responsibility significantly influenced their breathing zone concentrations (p = 0.03). The finding that particle number concentrations were approximately equal outside the hood and inside the local exhaust duct indicated poor effectiveness of the canopy hoods used to ventilate sealing operations.
Keywords
Nanotechnology; Clothing; Fabrics; Sealing-compounds; Exposure-assessment; Particulates; Nanoparticles; Airborne-particles; Aerosol-particles; Aerosol-sampling; Air-sampling; Breathing-zone; Ventilation; Ventilation-hoods; Sewing-machine-operators; Author Keywords: aerosol mapping; apparel workers; nanoparticles; occupational exposure; polytetrafluoroethylene
Contact
Thomas M. Peters, The University of Iowa, Department of Occupational and Environmental Health, 138 IREH, UI Research Campus, Iowa City, Iowa 52242-5000, USA
CODEN
JOEHA2
CAS No.
9002-84-0
Publication Date
20110301
Document Type
Journal Article
Email Address
thomas-m-peters@uiowa.edu
Funding Type
Grant
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-K01-OH-009255
Issue of Publication
3
ISSN
1545-9624
Priority Area
Manufacturing
Source Name
Journal of Occupational and Environmental Hygiene
State
IA; MA
Performing Organization
University of Iowa
TOP