Establishment of Model for Volatile Amount and Threshold Limit Value of 1,2-Dichloroethane in Adhesives Used for Shoe Making and Bags and Cases Making

Objective To explore the relationship between the volatile amount of 1,2-dichloroethane and the working condition and to establish mathematic model for providing the threshold limit value of 1,2-dichloroethane in adhesives used for shoe making and case and bag making.Methods The relationship between the volatile amount of 1,2-dichloroethane and the working condition was investigated by climate chamber,the mathematic model of which was established by multiple linear regressions.Results The volatile amount of 1,2-dichloroethane was mainly affected by the amount of 1,2-dichloroethane used and the rate of air replacement.The volatile amount increased as the amount of 1,2-dichloroethane added and was inversely proportional to the air replacement.The adhesives with low concentration of 1,2-dichloroethane vaporized faster.However,the ambient temperature likely showed little effect.The threshold limit value for 1,2-dichloroethane in adhesives used in shoe making and case and bag making was estimated by the multiple linear regression equation.The estimated threshold limit value was 5‰.Conclusions The GB 19340—2003Adhesives for footwear and base and bag should be revised since the threshold limit value of 1,2-dichloroethane was very low.