ISO 21129:2007 PDF

Name: ISO 21129:2007 — Hygrothermal performance of building materials and products — Determination of water-vapour transmission properties — Box method
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Hygrothermal performance of building materials and products — Determination of water-vapour transmission properties — Box method

Название (английский):

ISO 21129:2007

Hygrothermal performance of building materials and products — Determination of water-vapour transmission properties — Box method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 4 июля 2007 г.
Издание:: ISO IS 21129 edition 1 version 1
ICS:: 91.120.10

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Описание (английский):

ISO 21129:2007 specifies a box method for determining the water-vapour permeability of building materials. The box method is used primarily to measure the water-vapour permeance of materials that have low water-vapour resistance, in which the influence of the surface-humidity transmission-resistance cannot be ignored.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 21129:2007 specifies the box method for determining the water‑vapour transmission properties of building materials and products. Intended primarily for materials with low water‑vapour resistance (where surface‑humidity transmission resistance matters), the standard describes apparatus, specimen preparation, measurement procedures and calculations to obtain water‑vapour permeance, resistance and permeability. The method measures vapour flow by recording mass changes of saturated salt solutions in a sealed test box attached to the specimen.

Key topics and requirements

Test principle: A sealed water‑vapour permeability test box (standard size 600 × 600 × 600 mm) is attached to a 300 × 300 mm specimen. A saturated salt solution in the box establishes a controlled humidity difference between the two sides; vapour flow through the specimen is determined from mass change of the solution dish.

Specimen: Standard area 300 × 300 mm; thickness is the product thickness (homogeneous materials >100 mm may be sliced). Preconditioning at (23 ± 5) °C and (50 ± 10) % RH until mass stabilizes (≤5 % change over three days).

Apparatus & control: Room temperature controllable within 10–30 °C (±0.5 °C) and RH between (30 ± 3) % and (90 ± 3) %. Mixing fan to produce ~0.5 m/s air velocity at 50 mm from surface. Balance precision ±10 mg; hygrometers ±2 %.

Humidity generation: Use saturated aqueous salt solutions (examples at 23 °C: KNO3 ≈94 % RH, NaCl ≈75 %, Mg(NO3)2 ≈53 %, MgCl2 ≈33 %, LiCl ≈11 %) to obtain a 20–40 % RH difference across the specimen.

Measurement & calculation: Mass change measured at intervals until steady slope is obtained (at least five points with ±5 % consistency). Correct for box leakage via calibration. Compute water‑vapour permeance (W), resistance (Z) and permeability (δ). Surface‑humidity transmission resistance (1/β) is determined per Annex B and used to separate surface and material resistance.

Accuracy considerations: Seal integrity, specimen area/thickness measurement, humidity control and box leakage calibration are highlighted for measurement quality.

Applications and users

ISO 21129:2007 is used for:

Hygrothermal testing of building materials and components with low vapour resistance

Product development and quality control for insulation, vapor‑open membranes, claddings and porous finishes

Condensation risk analysis and selection of vapor control strategies in building physics

Laboratory testing by material test houses, research institutes, certification bodies, building physicists and manufacturers

Keywords: hygrothermal performance, water‑vapour transmission, box method, water‑vapour permeance, ISO 21129:2007, building materials testing.

ISO 21129:2007 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

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