1.1 These test methods cover two procedures for determination of the hydrogen ion concentration, expressed in terms of pH, of an aqueous extract of paper.
1.2 These test methods may be applied to writing, printing, and sized industrial papers.
1.3 These test methods are not intended to be used for determination of pH of insulating papers, for that see Test Methods D 202.
1.4 The test methods appear as follows: Section Test Method A—pH of Paper (Unfiltered Extract) After Extraction for 1 h in Cold (25 6 5°C) Water 11.1 Test Method B—pH of Paper (Unfiltered Extract) After Extraction for 1 h in Boiling Water 11.2
1.5 Specifications may be based on Test Method A or Test Method B, or both.
1.6 Where a specification or specific instructions or agreement to use only one of these test methods is absent, determine pH using both procedures, and interpret results based on Section 12.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM D778-97(2002) Referenced Document
ASTM D1193 Standard Specification for Reagent Water*, 1999-04-21 Update
ASTM D1293 Standard Test Methods for pH of Water*, 1999-04-21 Update
ASTM D1968 Standard Terminology Relating to Paper and Paper Products*, 1999-04-21 Update
ASTM D202 Standard Test Methods for Sampling and Testing Untreated Paper Used for Electrical Insulation
ASTM D585 Standard Practice for Sampling and Accepting a Single Lot of Paper, Paperboard, Fiberboard, and Related Product
ASTM E122 Standard Practice for Calculating Sample Size to Estimate, With a Specified Tolerable Error, the Average for Characteristic of a Lot or Process*, 2000-10-10 Update
ASTM E70 Standard Test Method for pH of Aqueous Solutions With the Glass Electrode
ASTM D778-97(2002) history
1997ASTM D778-97(2007) Standard Test Methods for Hydrogen Ion Concentration (pH) of Paper Extracts (Hot-Extraction and Cold-Extraction Procedures)
1997ASTM D778-97(2002) Standard Test Methods for Hydrogen Ion Concentration (pH) of Paper Extracts (Hot- Extraction and Cold-Extraction Procedures)
1997ASTM D778-97 Standard Test Methods for Hydrogen Ion Concentration (pH) of Paper Extracts (Hot- Extraction and Cold-Extraction Procedures)