ABSTRACT

For decades, precoated heat- and solvent-set tissues have been the preferred method for mending certain types of library and archival materials due to their translucency and ability to be used without introducing moisture. In recent years, the adhesives long used to make these tissues became unavailable. The National Archives and Records Administration and the Library of Congress report joint testing of a variety of precoated tissues made with Lascaux 498 HV, Lascaux 303 HV, Avanse MV-100, Plextol B500, Aquazol 200, and Aquazol 500, adding to and building upon their research presented in 2015. Prepared tissues were applied to substrates using both heat- and solvent-set methods, then they underwent a variety of analytical testing. Testing assessed color change and reversibility after artificial aging, blocking of mends and fills after natural aging under pressure, and the adhesives’ interactions with silver-based photographic materials. The method of application – heat or solvent – did not affect aging or testing results. The Avanse/Plextol tissues failed the color change tests. The Aquazol 200 and 500 dilutions and several Lascaux 498 HV and Lascaux 303 HV dilutions passed testing. Six successfully tested mixtures are presented, with case studies of use and recommendations for ongoing quality assurance.

摘要

几十年来，预涂层的热固化和溶剂固化薄纸一直是修复某些类型的图书馆和档案材料的首选方法，因为它们具有半透明性和在不引入水分的情况下使用的能力。近年来，长期用于制作这些纸巾的粘合剂变得不可用。美国国家档案和记录管理局和国会图书馆报告联合测试了由 Lascaux 498 HV、Lascaux 303 HV、Avanse MV-100、Plextol B500、Aquazol 200 和 Aquazol 500 制成的各种预涂层纸巾，并在此基础上进行了改进他们的研究发表于 2015 年。使用热固化和溶剂固化两种方法将制备好的组织应用于基材，然后进行各种分析测试。测试评估了人工老化后的颜色变化和可逆性，在压力下自然老化后修补和填充的阻塞，以及粘合剂与银基照相材料的相互作用。应用方法——加热或溶剂——不影响老化或测试结果。Avanse/Plextol 组织未能通过颜色变化测试。Aquazol 200 和 500 稀释液以及几种 Lascaux 498 HV 和 Lascaux 303 HV 稀释液通过了测试。介绍了六种成功测试的混合物，以及使用案例研究和持续质量保证的建议。