Record Display for the EPA National Library Catalog
RECORD NUMBER: 132 OF 343
|OLS Field Name||OLS Field Data|
|Main Title||Exposure to chemical additives from polyvinyl chloride polymer extrusion processing /|
|Author||Lamb, Cathy S.|
|CORP Author||Southwest Research Inst., San Antonio, TX.;Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab.|
|Subjects||Polyvinyl chloride. ; Vinyl chloride polymers. ; Indoor air pollution. ; Hazardous waste|
|Additional Subjects||Polyvinyl chloride ; Respiration ; Toxicity ; Plastics extruding ; Plastics industry ; Exposure ; Models ; Diffusivity ; Tables(Data) ; Pyrolysis ; Phthalates ; Air pollution ; Plasticizers ; Occupational exposure ; Risk assessment|
|Collation||xiv, 116 pages|
The report presents a model to predict worker inhalation exposure due to off-gassing of additives during polyvinyl chloride (PVC) extrusion processing. Data on off-gassing of additives were reviewed in the literature, the off-gassing at normal PVC processing temperatures was studied in the laboratory, process variables were estimated from an equipment manufacturer survey, and worker-activities and possible exposure sources were observed in an industrial survey. The purpose of the study was to develop a theoretical model to predict worker inhalation exposure to additives used during PVC extrusion processing. A model to estimate the generation rate of the additive from the polymer extrudate was derived from the mass transport equations governing diffusion. The mass flow rate, initial additive volatile weight fraction, off-gassing time, diffusivity, and slab thickness are required to determine the generation rate from the model.
"Report no. EPA/600/2-89/063." "Report date December 1989." "Contract no. CR813355." Microfiche.