ISO 5937-1980 PDF

Full title and description

ISO 5937:1980 — Sodium perborates for industrial use — Determination of degree of attrition. This International Standard specifies a laboratory method to measure the tendency of coarse granular sodium perborates to break down by attrition under defined mechanical treatment, reporting the result as the increase in percentage of material passing a 150 µm sieve after the test.

Abstract

This standard defines a test procedure using a high‑velocity jet of air in a small fluidized bed to break down a sample of sodium perborate and quantifies attrition by changes in particle size distribution. The outcome is expressed as the increase in the fraction passing a 150 µm test sieve, providing a reproducible measure for quality control and comparative assessment of granular stability.

General information

• Status: Withdrawn.
• Publication date: 31 October 1980.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.060.50 (Salts).
• Edition / version: ISO 5937:1980 (original edition).
• Number of pages: 5 pages (original publication).

Scope

Specifies a method for measuring the degree of attrition of coarse granular sodium perborates intended for industrial use. The procedure involves subjecting a test portion to a high‑velocity air jet in a small fluidized bed, determining particle size distribution before and after treatment, and calculating attrition as the increase in percentage passing a 150 µm aperture sieve. The method is intended for quality control and comparative testing rather than for defining absolute performance in all handling conditions.

Key topics and requirements

• Definition of the test principle: attrition by high‑velocity air jet in a small fluidized bed.
• Requirements for sample preparation and representative test portions.
• Specification of test apparatus and operating conditions to ensure reproducibility.
• Measurement of particle size distribution before and after treatment (sieving to 150 µm).
• Calculation and expression of degree of attrition as the increase in percentage passing the 150 µm sieve.
• Instructions for reporting results and acceptable test documentation for quality records.

Typical use and users

Used by manufacturers and quality control laboratories in the chemical and detergent industries that produce or handle sodium perborates. Typical users include production quality engineers, analytical laboratories, suppliers of granular bleaching agents, and standards organizations or regulatory testing bodies interested in product stability and handling characteristics.

Related standards

The standard references other ISO test methods relevant to sieving and detergent/chemical testing (for example ISO 565 for test sieves and related particle‑sizing practice and ISO methods for surface‑active agents and detergents referenced in the test text). Users commonly consult these adjacent methods when implementing sample preparation and sieving procedures for particle size determination.

Keywords

sodium perborate, attrition, particle size distribution, fluidized bed, sieving, 150 µm, quality control, granular stability, detergent raw materials.

FAQ

Q: What is this standard?

A: ISO 5937:1980 is an ISO test method titled "Sodium perborates for industrial use — Determination of degree of attrition" that defines a laboratory procedure to quantify mechanical breakdown (attrition) of coarse sodium perborate granules.

Q: What does it cover?

A: It covers a controlled laboratory procedure using a high‑velocity air jet in a small fluidized bed to produce attrition, followed by measurement of particle size distribution changes and expression of attrition as the increase in material passing a 150 µm sieve.

Q: Who typically uses it?

A: Manufacturers of sodium perborates and related bleaching or detergent raw materials, QA/QC laboratories, third‑party testing laboratories, and standards bodies performing comparative or routine stability testing.

Q: Is it current or superseded?

A: The bibliographic record indicates the document is withdrawn; it is not an active current ISO standard in its 1980 form. Users should check current ISO publications or national adoption documents for any replacement or newer methods before relying on this procedure for regulatory or formal compliance testing.

Q: Is it part of a series?

A: It is a standalone ISO method specific to sodium perborates but references other ISO test methods (for sieving and related analytical practice). It is not listed as a multi‑part series standard.

Q: What are the key keywords?

A: Sodium perborate; attrition; particle size; fluidized bed; sieve 150 µm; granular stability; quality control.