GOST 25699.2-90 PDF

Full title and description

GOST 25699.2-90 — "Carbon black for rubber industry. Methods for determination of surface area by CTAB adsorption". The standard specifies laboratory methods based on cetyltrimethylammonium bromide (CTAB) adsorption for measuring the external (specific) surface area of technical carbon (carbon black) used in rubber formulations.

Abstract

This standard defines a CTAB adsorption procedure to determine the specific external surface area of carbon black intended for the rubber industry. It establishes the required reagents, sample preparation, test procedure, calculation of results and reporting requirements to ensure repeatable and comparable surface-area measurements of carbon black batches used in rubber compounding.

General information

• Status: Active (in force).
• Publication date: 1 July 1991 (introduced by decision dated 27 July 1990; effective 01.07.1991).
• Publisher: Originally issued under the State Committee for Standards of the USSR (Gosstandart); maintained in national standards collections thereafter.
• ICS / categories: 83.040.20 — Carbon black; rubber additives / materials.
• Edition / version: Designation GOST 25699.2-90 (1990 designation, introduced 1991).
• Number of pages: 12 pages.

Scope

GOST 25699.2-90 applies to technical carbon (carbon black) grades produced for the rubber industry and specifies the laboratory method for determining the specific external surface area by adsorption of the cationic surfactant CTAB. The procedure covers reagent preparation, sample conditioning, adsorption measurement, calculation and expression of the specific surface value, and relevant acceptance/reporting conventions. The 1990/1991 edition replaced the earlier GOST 25699.2-83.

Key topics and requirements

• Definition of the external (specific) surface area of carbon black and its relevance to rubber compounding performance.
• Preparation and purification of CTAB reagent and auxiliary surfactants required by the method.
• Sample mass, dispersion and conditioning steps prior to adsorption measurement.
• Adsorption measurement procedure and calculation method to convert adsorbed CTAB to surface area (m2/g).
• Requirements for repeatability, expression of results and reporting (units, number of significant figures, test conditions).
• Reference to related test methods and normative documents needed to perform and interpret the test.

Typical use and users

Laboratories in carbon black production plants, quality-control and R&D laboratories at rubber and tire manufacturers, independent testing laboratories and standards organizations use this standard to assess and specify external surface area as a quality parameter for carbon black grades intended for rubber compounding.

Related standards

GOST 25699 series (e.g., GOST 25699.1-90, GOST 25699.3-90, GOST 25699.4-90, etc.) covering technical requirements and other test methods for carbon black for the rubber industry. The standard also cites older and complementary GOST methods and material standards referenced in its normative references.

Keywords

carbon black; technical carbon; rubber industry; CTAB adsorption; specific surface area; surface area measurement; test method; quality control; GOST 25699.2-90.

FAQ

Q: What is this standard?

A: GOST 25699.2-90 is a national (GOST) standard that specifies a CTAB adsorption method to determine the external specific surface area of carbon black used in rubber production.

Q: What does it cover?

A: It covers reagents and their preparation, sample handling, the adsorption test procedure using CTAB, the calculation of specific surface area (m2/g), and reporting conventions to ensure consistent measurements across laboratories.

Q: Who typically uses it?

A: Carbon black manufacturers, rubber and tire producers, QC/R&D laboratories, and independent testing laboratories engaged in materials characterization and quality assurance.

Q: Is it current or superseded?

A: The 1990/1991 edition (designated GOST 25699.2-90) was introduced effective 1 July 1991 and replaced the earlier GOST 25699.2-83; records in standards databases list the 25699.2-90 text as the active procedural standard.

Q: Is it part of a series?

A: Yes. GOST 25699.2-90 is part of the GOST 25699 series that addresses technical carbon (carbon black) for the rubber industry; the series includes related methods and specifications for physical, chemical and performance characteristics of carbon black.

Q: What are the key keywords?

A: Carbon black, CTAB adsorption, specific surface area, rubber additives, test method, GOST 25699.2-90.