Hard resin such as Rosin modified moleics. Rosin, modified phenolics and Aromatic hydrocarbon resin petrez SP 100 (source IPCL) were dissolved in mineral turpentine (50% solids) and their films were applied on the glass pannels (10cm × 3cm × 0.5cm) to give a WFT of 3 mils. The loss of solvent from the film was studied at an interval of 10 minutes till the weight of film was nearly constant at ambient temperature.
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