Symptoms and lung function in low-exposure to TDI by polyurethane foam manufacturing

Area of Science:

• Occupational Health
• Industrial Hygiene
• Respiratory Medicine

Background:

• Polyurethane foam manufacturing involves exposure to toluene diisocyanate (TDI).
• Understanding the respiratory health effects of TDI exposure is crucial for worker safety.
• Previous studies suggest potential respiratory irritation from isocyanates.

Purpose of the Study:

• To investigate the effects of occupational exposure to TDI on lung function.
• To assess respiratory symptoms in workers exposed to TDI in polyurethane foam factories.
• To differentiate TDI-related effects from smoking-related respiratory changes.

Main Methods:

• Cross-sectional study in seven polyurethane foam factories.
• Lung function tests including spirometry and nitrogen wash-out.
• Personal air sampling for toluene diisocyanate (TDI) exposure assessment.
• Questionnaires for respiratory symptoms, differentiating between smokers and non-smokers.

Main Results:

• Mean occupational exposure to TDI was 0.008 mg/m3.
• Non-smoking exposed workers reported a higher frequency of airway symptoms compared to unexposed controls.
• No significant acute or chronic effects on lung function were detected that could not be attributed to smoking.

Conclusions:

• While TDI exposure may correlate with increased airway symptoms in non-smokers, it did not lead to measurable lung function impairment in this study.
• Smoking appears to be a significant confounding factor in assessing respiratory health in this occupational setting.
• Further research may be needed to elucidate long-term effects and dose-response relationships.