GOST 30437-96 PDF

Full title and description

GOST 30437-96 — "Pulps. Method for determination of brightness" (Russian: "Целлюлоза. Метод определения белизны"). The standard specifies laboratory preparation of test sheets (sheet castings) and the photometric procedure for determining the brightness of pulp samples; it is historically equivalent to ISO 3688 (1977).

Abstract

This standard defines a laboratory method to prepare sheet castings from pulp suspensions and to measure the optical brightness of those sheets under specified instrument and conditioning conditions. Results are expressed as a percentage brightness; the method includes sample disintegration, sheet forming, pressing, drying and photometric measurement (measurement with blue filter giving an effective wavelength around 457 nm is specified).

General information

• Status: Replaced / superseded (standard replaced by GOST 30437-2023).
• Publication date: Designation year 1996 (GOST 30437-96); date of formal introduction recorded as 1 July 2001.
• Publisher: Interstate standard (Межгосударственный стандарт); prepared by MTK 144 with participation of the Ukrainian State Research Institute of the Pulp and Paper Industry (UkrNIIB); adopted by the Interstate Council for Standardization, Metrology and Certification (EASC / Межгосударственный совет по стандартизации, метрологии и сертификации).
• ICS / categories: 85.040 (Pulps). Equivalent/linked international standard: ISO 3688.
• Edition / version: GOST 30437-96 (1996); introduced 1 July 2001; later replaced by GOST 30437-2023 (implemented as national standard from 1 April 2024).
• Number of pages: 9 pages (original text).

Scope

Applies to chemical pulps (cellulose) and establishes a laboratory procedure for preparing sheet castings and measuring their optical brightness for quality control and specification purposes. The standard does not apply to pulps that contain added optical brightening agents (optical whiteners). It is intended for use in laboratory and factory quality assessment of pulp optical properties.

Key topics and requirements

• Preparation of pulp suspension and disintegration to separate fibers (use of a disintegrator per referenced apparatus).
• Formation of laboratory sheet castings (specified sample masses, number of casts — typically four — and handling to avoid contamination).
• Pressing and drying conditions for sheet castings (specified pressing pressures and drying regimes to control moisture and optical properties).
• Conditioning of samples (notes on pH of suspension — recommended pH range about 4.0–5.5 for unbleached pulps — and use of analytical-grade reagents and deionized water).
• Photometric measurement procedure (use of incandescent lamp with blue filter to give effective wavelength ~457 nm, instrument calibration, measurement on the upper face of each cast, and use of the arithmetic mean of four readings).
• Expression and rounding of results (brightness expressed in percent; average of measurements taken as the test result and rounded according to the procedure in the standard).

Typical use and users

Used by pulp and paper laboratory staff, quality control and R&D teams in pulp mills, suppliers of pulp, test laboratories performing acceptance or comparative testing, and standards bodies. Typical applications include specification testing, production control of pulp brightness and inter-laboratory comparisons.

Related standards

ISO 3688 (equivalent historical international document), GOST 30437-2023 (replacement — "Pulps. Methods for preparing laboratory sheet castings for measuring optical properties"), and other pulp/paper test methods such as ГОСТ 30116 and standards for related optical measurements and sample preparation.

Keywords

pulps; cellulose; brightness; whiteness; sheet castings; laboratory preparation; photometric measurement; ISO 3688; pulp testing; optical properties.

FAQ

Q: What is this standard?

A: GOST 30437-96 is a laboratory test standard titled "Pulps. Method for determination of brightness" that sets out how to prepare laboratory sheet castings from pulp and how to measure their optical brightness.

Q: What does it cover?

A: It covers sample preparation (disintegration, suspension handling), formation of sheet castings, pressing and drying conditions, instrument and filter selection for photometric brightness measurement (effective blue wavelength ~457 nm), and reporting of brightness results. It excludes pulps containing optical brightening agents.

Q: Who typically uses it?

A: Laboratory analysts in pulp and paper mills, independent test laboratories, quality assurance teams, researchers in pulp and paper science, and standards organizations.

Q: Is it current or superseded?

A: GOST 30437-96 has been superseded and replaced by GOST 30437-2023 (adopted for use as a national/interstate standard and entered into force in 2024); users should consult the 2023 edition for the current procedures and any methodological updates.

Q: Is it part of a series?

A: It is part of the set of standards addressing pulp and paper test methods (ICS 85.040) and is related to other GOST/ISO methods for pulp preparation and optical property measurement (for example, standards referenced for sample forming and measurement procedures).

Q: What are the key keywords?

A: Brightness, pulp, cellulose, laboratory sheet castings, photometric measurement, ISO 3688, sample preparation, pulp testing.