ISO 21901:2021

Thermal insulation — Test method for thermal diffusivity — Periodic heat method

Publication date: Feb 25, 2021

General information

Current stage: 90.20 Effective date: Jan 15, 2026

Originator: ISO

Owner: ISO/TC 163/SC 1

Type: International Standard

ICS: 27.220

Languages: English French

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Status: Published

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Scope

This document specifies a periodic heat method for measurement of the thermal diffusivity of thermal insulation material in the shape of a flat plate.

Life cycle

NOW

PUBLISHED
ISO 21901:2021
90.20 Standard under periodical review
Jan 15, 2026

REVISED BY

IN_DEVELOPMENT
ISO/PWI 21901

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