Measurement and statistic analysis of combustion heat of two kinds of household spray aerosols in China

摘要

High volatility makes it difficult to measure the combustion heat of spray aerosols' content. However, calorific value is a precondition to grade the fire hazard classification of aerosol products according to UN Recommendations of the Transport of Dangerous Goods-Model Regulations. With auxiliary of empty medical capsule, injector and adhesive tape, etc., a series of combustion heat tests on some household aerosol products including insecticide aerosol and air freshener aerosol products sold in China were completed with a commercial oxygen bomb calorimeter. The confidence interval of different kinds of aerosols' combustion heats were researched at 95% confidence level. The results show that the confidence interval range of combustion heat of insecticide aerosol is from 43359 J/g to 49911 J/g, higher than 20 kJ/g, which is the critical quota to determine the flammability of aerosol products. The heat of air freshener aerosols are less than one-tenth of insecticide aerosols, which is from 2743 J/g to 3430 J/g. According to the UN regulation, insecticide aerosol products at least belong to the flammable ones at 95% confidence level, and the air freshener aerosol products are relatively safe on the characteristic of fire risk.