ISO 20494:2017 pdf download

ISO 20494:2017 pdf download.Paper — Requirements for stability for general graphic applications
1 Scope
This document specifies the requirements for the stability of paper for general graphic applications. It is applicable to all types of uncoated, coated and filled papers.
NOTE For information on International Standards on paper permanence (see ISO 9706), archival paper permanence and durability (see ISO 11108) and on paper stability for general graphic applications (see ISO 20494), refer to Annex C.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 186, Paper and board — Sampling to determine average quality
ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples
ISO 536, Paper and board — Determination of grammage
ISO 1974, Paper — Determination of tearing resistance — Elmendorf method
ISO 5630-3, Paper and board — Accelerated ageing — Part 3: Moist heat treatment at 80 degrees C and 65 % relative humidity
ISO 6588-1, Paper, board and pulps — Determination of pH of aqueous extracts — Part 1: Cold extraction
ISO 10716, Paper and board — Determination of alkali reserve
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1 paper stability
ability of paper to retain its intended functionality for general graphic applications (3.2), under normal use and storage conditions
Note 1 to entry: Stability for the purpose of this document differs from permanence which is required for paper used for documents to be stored over long periods of time, as in libraries, archives and other protected environments (see ISO 9706)
3.2
general graphic applications
printing and writing on graphic paper for all applications not intended for permanent storage
Note 1 to entry: Typical products used for general graphic applications include newspapers, magazines,
catalogues, books, office printouts and copies.
3.3 alkali reserve
compound (such as calcium carbonate) that neutralizes acid that might be generated as a result of natural ageing or from atmospheric pollutants
Note 1 to entry: Determined as specified in ISO 10716.
4 Principle
In this document, the requirements for the stability of paper for general graphic applications are given in terms of
— minimum tearing resistance prior to accelerated ageing,
— retention of tearing resistance after accelerated ageing,
— minimum content of a substance (such as calcium carbonate) that neutralizes acid action, measured by the alkali reserve test, and
— maximum and minimum pH values of a cold water extract of the paper