The Australian currency is not made of paper. Here, polymer currencies (kind of plastic) are in use.Securency, the company behind this, is recognised as world leader in polymer substrate technology and the supplier of materials for the printing of banknotes.
First plastic currency notes (of denomination $5) were introduced in Australia before 13 years in this same month of July. In 1996, Australia became the first country with full series of circulating polymer banknotes. Primary advantages are 1) the currency notes lasts much longer than paper currencies 2) very difficult to counterfeit notes and 3) more security features can be embedded. They are friendly to environment too! You can see more advantages at http://www.securency.com.au
List of countries those have adapted / adapting to polymer currencies: Australia, Bangladesh, Brazil, Brunei, Chile, China, Indonesia, Kuwait, Malaysia, Mexico, New Zealand, Nepal, Northern Ireland, Papua New Guinea, Romania, Singapore, Solomon Islands, Sri Lanka, Taiwan, Thailand, Vietnam, Western Samoa, Zambia