http://www.precious-piece.com/products/products_sizing.html
Architectural and industrial washi has long been available in water/humidity repellent form, and like paper cones in loudspeakers, they last. (my pair of jbl monitors were inherited from my grand dad, he bought them in the late 60s, tweeters, midranges, woofers, all made of paper, lasted 5 relocations, from Asia to North America now back in Asia).
Washi in audio applications
http://rincrossing.smrj.go.jp/en/story/story48.php
Washi uses long interlaced fibre and is closer to papyrus than it is to photocopy paper. Washi has been used to make clothes, reusable plates, architectural screens etc.
http://www.aisf.or.jp/%7Ejaanus/deta/w/washi.htm