GB/T 13893-2008 in English

《GB/T 13893-2008色漆和清漆 耐湿性的测定 连续冷凝法》由TC5（全国涂料和颜料标准化技术委员会）归口，TC5SC9（全国涂料和颜料标准化技术委员会钢结构防腐涂料体系分会）执行，主管部门为中国石油和化学工业联合会。
本标准按照涂层要求或产品规定了一种评定涂膜、涂料体系及其同类产品在连续冷凝的高湿度环境中，耐湿性的测定方法。本标准适用的涂层底材包括多孔底材(如木材、石膏和纸面石膏板)和非多孔性底材（如金属）等。本方法指名了一种在严酷暴露条件下可能发生于涂层表面的连续冷凝性能试验。本试验方法可以揭示涂层破坏（包括起泡、沾污、软化、起皱和脆化）以及底材破坏的现象。

Paints and varnishes - Determination of resistance to humidity - Continuous condensation

1 Scope

This standard specifies a method for determining the resistance of paint films, paints systems and related products to conditions of continuous condensation in high humidity in accordance with the requirements of coating or product specifications.

The method is applicable to coatings both on porous substrates such as wood, plaster and plasterboard and on non-porous substrates such as metal. It provides an indication of the performance likely to be obtained under severe conditions of exposure where continuous condensation occurs on the surface.

The test method may reveal failures of the coating (including blistering, staining, softening, wrinkling and embrittlement) and deterioration of the substrate.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.

GB/T 3186 Paints, varnishes and raw materials for paints and varnishes - Sampling (GB/T 3186-2006, ISO 15528:2000, IDT)
GB/T 6682 Water for analytical laboratory use - Specification and test methods (GB/T 6682-2008, ISO 3696:1987, MOD)
GB/T 9271 Paints and varnishes - Standard panels for testing (GB/T 9271-2008, ISO 1514:2004, MOD)
GB/T 9278 Temperatures and humidities for conditioning and testing of paint specimens (GB/T 9278-2008, ISO 3270:1984, IDT)
GB/T 13452.2 Paints and varnishes - Determination of film thickness (GB/T 13452.2-2008, ISO 2808:2007, IDT)
GB/T 20777 Paints and varnishes - Examination and preparation of samples for testing (GB/T 20777-2006, ISO 1513:1992, IDT)
ISO 4628-1 Paints and varnishes – Evaluation of degradation of paint coatings – Designation of intensity,
quantity and size of common types of defect – Part 1: General principles and rating schemes
ISO 4628-2 Paints and varnishes – Evaluation of degradation of paint coatings – Designation of intensity,
quantity and size of common types of defect – Part 2: Designation of degree of blistering
ISO 4628-3 Paints and varnishes – Evaluation of degradation of paint coatings – Designation of intensity,
quantity and size of common types of defect – Part 3: Designation of degree of rusting
ISO 4628-4 Paints and varnishes - Evaluation of degradation of paint coatings – Designation of intensity,
quantity and size of common types of defect – Part 4: Designation of degree of cracking
ISO 4628-5 Paints and varnishes - Evaluation of degradation of paint coatings – Designation of intensity,
quantity and size of common types of defect – Part 5: Designation of degree of flaking

3 Principle

A coated test panel is exposed to continuous condensation and the effects of the exposure are evaluated by criteria agreed in advance between the interested parties, these criteria usually being of a subjective nature.

4 Required supplementary information

For any particular application, the test method specified in this standard needs to be completed by supplementary information. The items of supplementary information are given in Annex A.

Foreword II
1 Scope
2 Normative references
3 Principle
4 Required supplementary information
5 Apparatus
6 Sampling
7 Test panels
8 Method of exposure of test panel
9 Examination of test panels
10 Precision
11 Test report
Annex A (Normative) Required supplementary information