The system (sample þ paper) was then placed in a drying oven at 40 C for 48 h. After this period, the weight increment of the paper was determined and the extent of plasticizer exudation was calculated.
The system (sample þ paper) was then placed in a dryingoven at 40 C for 48 h. After this period, the weight incrementof the paper was determined and the extent ofplasticizer exudation was calculated.