The amount of amylase and amylopectin various according to the source. The main physical properties are Odourless, Tasteless, Colourless, Non-toxic, Biologically degradable, Resistant to passage of oxygen, Semipermeable to carbon dioxide. These properties assist to use as good quality packaging material. As the content of amylose increases starch film becomes
more oxygen impermeable and water soluble. There will be additional properties such as more flexibility, heat sealable and water resistant properties.