ASTM D778-97(2007)
Standard Test Methods for Hydrogen Ion Concentration (pH) of Paper Extracts (Hot-Extraction and Cold-Extraction Procedures)

Standard No.

ASTM D778-97(2007)

Release Date

1997

Published By

American Society for Testing and Materials (ASTM)

Status

Withdraw 2010-02

Latest

ASTM D778-97(2007)

Scope

The acidity or alkalinity of a paper sample extract is important because of the effect of paper acidity or paper alkalinity on the permanence of the paper. Although acidity or alkalinity may be determined by titration the pH is often more indicative of the stability of paper than is the total acidity or alkalinity.

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 ± 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(2007) Referenced Document

• ASTM D1193 Standard Specification for Reagent Water*， 1999-04-19 Update
• ASTM D1293 Standard Test Methods for pH of Water*， 1999-04-19 Update
• ASTM D1968 Standard Terminology Relating to Paper and Paper Products*， 1999-04-19 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(2007) history

• 1997 ASTM D778-97(2007) Standard Test Methods for Hydrogen Ion Concentration (pH) of Paper Extracts (Hot-Extraction and Cold-Extraction Procedures)
• 1997 ASTM D778-97(2002) Standard Test Methods for Hydrogen Ion Concentration (pH) of Paper Extracts (Hot- Extraction and Cold-Extraction Procedures)
• 1997 ASTM D778-97 Standard Test Methods for Hydrogen Ion Concentration (pH) of Paper Extracts (Hot- Extraction and Cold-Extraction Procedures)