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ISO 6868:2026

Workplace air — Quantitative determination of quartz and cristobalite in bulk materials by X-ray powder diffraction methods

Aug 12, 2026

General information

60.60     Aug 12, 2026

ISO

ISO/TC 146/SC 2

International Standard

13.040.30  

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Scope

This document specifies three methods for quantitative measurement of crystalline silica (CS) major polymorphs (quartz and cristobalite) mass percentage content in bulk samples using X-ray powder diffraction (XRPD). This document also provides general information about the capabilities and limitations of relevance to laboratories working for routine testing.
Only X-ray diffractometers with Bragg-Brentano geometry are considered. XRPD techniques are used to characterize specimens in the form of loose powders, where the median grain size is between 1 μm and 10 μm physical diameter. Block specimens are not considered.
Although a number of methods of analysis are considered in this document, other XRPD methods of analysis can be considered if they are demonstrated to give equivalent results.

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PUBLISHED
ISO 6868:2026
60.60 Standard published
Aug 12, 2026