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
