Mail bag requires certain qualities to serve its purpose, one of which most important is that it must provide sufficient protection for postal material contained in it. Water-proof, in this case, is extremely important especially in region like Indonesia. Such a property is normally provided by treating mail bag, which is usually made of canvas, with wax emulsion. This type of coating is not permanent, in the sense that it may be removed either by rubbing and/or other severe condition during its use. Chemical treatment with fluorocarbon and melamine resin was proposed to improve its water-proof effect. The experiment shows that fluorocarbon and melamine resin can work together in improving the quality of mail bag. (Aris Hudayana, Aryaji, Berlian Zain, Eka Diasy)
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