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ISO 6868:2026

Workplace air - Quantitative determination of quartz and cristobalite in bulk materials by X-ray powder diffraction methods
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ISO 6868:2026

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

PUBLISH DATE 2026
ISO 6868:2026

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 ÎĽm and 10 ÎĽm 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.

SDO ISO: International Organization for Standardization
Document Number ISO 6868
Publication Date Aug. 1, 2026
Language en - English
Page Count 62
Revision Level
Supercedes
Committee ISO/TC 146/SC 2
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