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Exposure to solvents in the metal fabrication and engineering industry

Exposure to solvents in the metal fabrication and engineering industry. 2nd European Conference on AWARE and other coding systems, Gent, October 4 & 5, 2007 Henri Heussen, PhD, & Hester Dekker, MSc. Background. Web based tool metal sector: coating & degreasing

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Exposure to solvents in the metal fabrication and engineering industry

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  1. Exposure to solvents in the metal fabricationand engineering industry 2nd European Conference on AWARE and other coding systems, Gent, October 4 & 5, 2007 Henri Heussen, PhD, & Hester Dekker, MSc

  2. Background • Web based tool metal sector: coating & degreasing • Aim: exposure to solvents self risk assessment by SME’s and larger companies Tool: two validated routes • Good Practices (Risk Management Measures = RMM) • Model: Occupational Air Requirement (OAR) or Required Air Quantity (RAQ) This part: validation of good practices and applied ventilation model Next part IVAM: using the same exposure data > validation of AWARE ventilation model

  3. Activities studied Good Practices • Degreasing by dipping – (semi) closed system • Mixing paint – closed mixer • Cleaning spray guns – closed washing machine with LEV Model • Brushing/rolling • Spraying

  4. Model: calculation OAR Legenda: OAR: Occupational Air Requirement (m3/l) Vi: Volume solvent/liter paint (ml/l) i: index including all solvents in the paint ρi: specific gravity (g/ml) fi: evaporation factor (default 1) OELi: Occupational Exposure Limit solvent (mg/m3) or hardener & thinner or hardener & thinner

  5. Calulation needed ventilation QOAR: Ventilation needed according to OAR (m3/hr) OAR: Occupational Air Requirement (m3/l) Ve:Amount used (l) T: Time (hr)

  6. Calculation Exposure Index (EI) Legenda: EImodel: Exposure index QOAR: Needed ventilation (m3/hr) Qd: Actual ventilation (m3/hr)

  7. Results - Good Practice mixing paint:closed mixer 10 comp. 32 meas. EI RMM

  8. Conclusions Good Practices: • Predefined Good Practices are indeed good (statistically validated) • Also other Good Practices found (some statistically validated) • Detailed description of Good Practice is necessary and a prerequisite for correct use of the tool

  9. Results brushing/rolling(excluding natural ventilation) 7 companies 20 measurem. EI model EI measurements

  10. Results spraying(excluding natural ventilation) 6 companies 14 measurem. EI model EI measurements

  11. Conclusions model • Very good correlation between model and measurement data • However, model does not always overestimate • Therefore for brushing/rolling a safety factor is needed! • For spraying not a priori necessary > political decision • To be calculated on the basis of sensitivity/specificity

  12. Conclusions model (continued) • After adding safey factor(s) model = validated exposure assessment tool • Erring to the side of caution: • separation between local and general ventilation • MSDS upper limit range (volume solvent/l) • more than one sprayer in the same room > total amount of solvents used by all sprayers attributed to one sprayer • Covers a wide range: • in amount of paint used per time • room volume • type of ventilation • ventilation capacity • measured exposure index

  13. Thanks for your attention!This study:- performed by order of the social partners (FME-CWM, Metaalunie, FNV, CNV, De Unie)- supported by the Ministry of SZW (VASt programme)

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