1.1本规范涵盖了用于准备预期寿命最长或最长的记录和文件的债券和分类账。 1.2已显示 (, ) 预期寿命至少是纸张水提取物pH值的近似函数。规定了三个pH值水平，反映了三个预期寿命水平。 1.3以下内容有望显著延长书籍和文件的预期寿命:使用酸度受控的纸张，或在中性或碱性条件下制造的纸张，尤其是使用碳酸钙填充物的纸张，碳酸钙填充物可吸收大气中的酸性气体，并能中和纸张老化过程中形成的酸性物质。 1.4本规范基于木质素含量不超过1%的纸张生产中使用的纤维来源，用于档案、图书馆和其他永久记录中的纸张。然而，在适当的条件下，（参见），木质素含量超过1%的纸张可用于其他最终用途，用于需要具有较长预期寿命的记录。 1.5如附录和所示，本规范可作为指南。

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 least an approximate function of the pH of an aqueous extract of the paper. Three pH levels, reflecting three levels of life expectancy, are specified. 1.3 The following would be expected to contribute significantly to the life expectancy of books and documents: the use of papers with controlled acidity, or of papers manufactured under neutral or alkaline conditions, especially papers with a calcium carbonate filler that absorbs acidic gases from the atmosphere and can neutralize acidic materials formed in the aging of paper. 1.4 This specification is based on fiber sources used in the production of paper that contains no more than 1 % lignin, for papers used in archives, libraries, and other permanent records. However, under proper conditions, (see ), paper containing more than 1 % lignin may be employed for other end uses in paper for records that are required to have a substantial life expectancy. 1.5 As indicated in Appendix and, this specification may be used as a guide.