1.1 This specification covers bond and ledger papers used in the preparation of records and documents that are expected to have maximum, or substantial, life expectancy.1.2 It has been shown (, , , , ) that life expectancy is at lea This specification covers bond and ledger papers used in the preparation of permanent records and documents that are expected to have maximum, or substantial, life expectancy. Three types of bond and ledger papers are described, according to life expec