GOST 12523-77 PDF

Full title and description

GOST 12523-77 — "Целлюлоза, бумага, картон. Метод определения величины рН водной вытяжки" (English: "Cellulose, paper, board. Method for determination of pH value of aqueous extract"). The standard specifies a laboratory method to obtain an aqueous extract from samples of cellulose, paper or board and to determine the pH of that extract as an indicator of active acidity or alkalinity of the material.

Abstract

GOST 12523-77 defines sample preparation, extraction (hot and cold options), and pH measurement procedures for aqueous extracts of pulp, paper and board used in quality control and materials testing. The method produces a water extract (by cold or hot extraction) and requires measurement of the extract pH with a calibrated pH meter or equivalent technique; results characterise the material's active acidity/alkalinity for production control, specification and comparative testing.

General information

• Status: Active / действующий (limitation of validity lifted by protocol; standard remains in force with integrated amendments).
• Publication date: Approved 19 September 1977; introduced 01 January 1978.
• Publisher: Approved by the State Committee for Standards (Gosstandart) of the Council of Ministers of the USSR; maintained in national/international collections of GOST standards.
• ICS / categories: Paper and pulp classification — ICS 85.040 (pulps) and 85.060 (paper and board).
• Edition / version: Designation GOST 12523-77 (1977); includes amendments issued in 1983 and 1987 (amendments integrated in later reprints).
• Number of pages: 6 (concise method standard).

Scope

The standard applies to cellulose, paper and board and establishes a reproducible laboratory procedure for preparing an aqueous extract (by either cold or hot extraction) from a representative sample and determining the pH of that extract. It is intended for routine quality control, material specification and comparative testing across types of pulp, paper and board (including some electrical papers where specified sampling masses differ).

Key topics and requirements

• Definition of representative sampling and required sample mass for different product types (examples: typical sample masses and special provisions for electrical insulation papers).
• Preparation of aqueous extract: cold extraction and hot extraction procedures (hot extraction commonly performed at approximately 98 ± 2 °C for 1 hour, with intermittent shaking), plus cooling and handling instructions.
• Use of distilled or deionized water (freshly boiled or de-aerated where specified) to prepare extracts to avoid CO2/electrolyte interference.
• pH measurement: calibration of pH meter, measurement of the extract at specified temperature (typically 20–25 °C after cooling), and expression/reporting of results as the pH of the aqueous extract.
• Requirements for repeatability, number of replicates (two extracts commonly prepared), and conditions for reporting and interpretation of results.

Typical use and users

Used by quality-control and analytical laboratories in pulp and paper mills, paper converters, material suppliers, testing laboratories, and regulatory or certification bodies. Conservators, archival scientists and manufacturers of paper-based products (including food-contact, electrical insulation and printing papers) use the method to assess acidity/alkalinity that affects product performance and longevity.

Related standards

GOST 12523-77 is linked to international and regional methods for pH and aqueous extract determinations: it is stated to correspond to regional/ISO documents (e.g., ST SEV 3673—82 and ISO 6588 series on pH of aqueous extracts). The standard replaced the earlier GOST 12523-67. For broader context and modern practice, see the ISO 6588 series (Part 1 — cold extraction and related ISO guidance).

Keywords

pH; aqueous extract; water extract; cellulose; paper; board; pulp; extraction; cold extraction; hot extraction; quality control; GOST; Gosstandart; ISO 6588.

FAQ

Q: What is this standard?

A: GOST 12523-77 is a Soviet/Interstate (GOST) method standard that specifies how to prepare an aqueous extract from samples of cellulose, paper and board and how to determine the pH of that extract for quality and material characterisation.

Q: What does it cover?

A: It covers sampling guidance, procedures for cold and hot extraction to obtain a water extract, handling/cooling of extracts, and pH measurement and reporting (including calibration and replicates) to give a reproducible value of active acidity/alkalinity for the material under test.

Q: Who typically uses it?

A: Industrial and independent testing laboratories, pulp and paper mill QC departments, converters and manufacturers of paper products, archivists/conservators and certification bodies that need a standardised pH measurement of paper and board.

Q: Is it current or superseded?

A: According to available national sources the 1977 standard (introduced 01 Jan 1978) remains in force in its issued form with integrated amendments (amendments from 1983 and 1987 are noted); limitations of validity were removed by protocol in 1995. For international alignment and more recent international practice, consult the ISO 6588 series (latest editions) when harmonisation with current ISO practice is required.

Q: Is it part of a series?

A: It sits in the family of test methods for paper, board and pulp chemical properties (ICS 85.040 / 85.060) and is referenced alongside related GOSTs and ISO methods (for example ISO 6588 on pH of aqueous extracts). It replaced an earlier national version (GOST 12523-67).

Q: What are the key keywords?

A: pH, aqueous extract, water extract, cellulose, paper, board, extraction, cold extraction, hot extraction, quality control, ISO 6588.