GB/T 30805-2024Thermal insulating products for building applications—Determination of short-term water absorption by partial immersion (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard, using translation method, identically adopts ISO 29767.2008

Thermal insulating products for building applications - Determination of short

term water absorption by partial immersion.

This Standard was proposed by China Building Materials Federation.

This Standard shall be under the jurisdiction of National Technical Committee

on Insulation Material of Standardization Administration of China (SAC/TC 191).

The drafting organizations of this Standard. Nanjing Glass Fiber Research &

Design Institute Co., Ltd., National Glass Fiber Products Quality Supervision

and Inspection Center.

Main drafters of this Standard. Cui Jun, Chen Lihua, Jiang Pengfei, Yang Chao.

Thermal insulating products for building applications -

Determination of short term water absorption by

partial immersion

1 Scope

This Standard specifies the equipment and procedures for determining the

short-term water absorption of specimens by partial immersion. This Standard

is applicable to thermal insulating products.

NOTE The procedure specified by this Standard is intended to simulate the water absorption

caused by a 24 h raining period during construction work.

2 Normative references

The following referenced documents are indispensable for the application of

this document. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any

amendments) applies.

ISO 29768 Thermal insulating products for building applications -

Determination of linear dimensions of test specimens

ISO 5725-2 Accuracy (trueness and precision) of measurement methods

and results - Part 2.Basic method for the determination of repeatability and

reproducibility of a standard measurement method

3 Principle

A specimen is placed with its lower part in water for a period of 24 h and the

change in its mass is measured.

The excess water adhering to the surface but not absorbed by the specimen is

removed by drainage (method A) or taken into account by deduction of the initial

water uptake (method B).

4 Apparatus