Pernanent paper: Paper which is scid-free and made to stringent conditions for archival purpsdes. A neutral sized paper does not in itself qualify for the epithet of permamemt paper.

• 耐久纸:在严格条件下生产，作档案记录用途的无酸纸张。中性施胶的纸张，并不能称为耐久纸。