GB/Z 179-2026Damp heat, steady state (unsaturated pressurized vapour with air) (English PDF)
恒定湿热（含空气的未饱和高压蒸汽）
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
July 2, 2026
Implementation date
July 2, 2026
Scope
GB/Z 179-2026 is the English-translated version of 恒定湿热（含空气的未饱和高压蒸汽）.
GB/Z 179-2026 is the Chinese standard "Damp heat, steady state (unsaturated pressurized vapour with air)". Its scope clause reads: This document describes a novel experimental method that introduces a certain volume of air into a conventional HAST test chamber filled with water vapor.
The document provides an overview of traditional HAST test chambers and air-HAST test equipment (HAST test chambers are filled with air), and gives a... Examples of air-HAST testing equipment and application examples of air-HAST. Its clauses include terms and definitions; hast and air - hast overview.
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Document preview — GB/Z 179-2026
National Standard of the People's Republic of China
- ICS
- 19.040
- Classification
- K 04
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Introduction IV
- 1.Scope
- 2 Normative References
- 3.Terms and Definitions
- 4 HAST and Air - HAST Overview
- 4.1 Overview of HAST Test Chamber
- 4.2 Structure of the Air-HAST Device
- 5.2 Test Methods
- 5.3 Test Results
- 5.4 Precautions
- 5.5 Summary
- 6.Air-HAST evaluation test applied to crystalline silicon (c-Si) photovoltaic modules
- 6.1 Background and Objectives
- 6.2 Structure and Degradation Factors of Photovoltaic Modules
- 6.3 Test Methods
- 6.4 Test Results
- 6.5 Discussion
- 6.6 Conclusion
- 7 Summary
- References
1 Scope
This document describes a novel experimental method that introduces a certain volume of air into a conventional HAST test chamber filled with water vapor.
The document provides an overview of traditional HAST test chambers and air-HAST test equipment (HAST test chambers are filled with air), and gives a...
Examples of air-HAST testing equipment and application examples of air-HAST.
2 Normative references
This document has no normative references.
3 Terms and Definitions
The following terms and definitions apply to this document.
The URLs for the terminology databases maintained by ISO and IEC for standardization are as follows.
3.1 Galvanic corrosion
3.2 Kirkendale effect
The migration of the boundary layer between two metals due to the different diffusion rates of metal atoms.
3.3
Traditional test methods developed to assess the corrosion of semiconductor wiring at temperatures of 100°C or higher.
3.4 air-HAST
The HAST test method involves applying additional air partial pressure in the HAST test chamber.
4 HAST and Air - HAST Overview
4.1 Overview of HAST Test Chamber
4.1.1 HAST Test Chamber Structure
HAST is an evaluation test conducted in a high-temperature, high-humidity, unsaturated, high-pressure steam atmosphere exceeding 100°C. The test setup is approximately...
It is divided into single-container type and double-container type, as shown in Figure 1.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 35 pages — is available in the English PDF.
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