Paints and varnishes — Standard panels for testing
1Key Takeaways
This document specifies several types of standard panels and provides guidance and requirements on the procedures for their preparation prior to painting. The standard panels described in this document are intended for use in general methods of test for paints, varnishes and related products.
2Expert Interpretation
An in-depth interpretation of the technical requirements of the sixth edition of ISO 1514:2024 on standard panels for coatings testing, covering updates on pretreatment methods for 12 types of substrates such as steel, aluminum, and plastics, comparing the differences between the new and old versions, and providing surface treatment implementation plans that meet international standards.
Analysis of core changes in the standard
| Technical elements | 2016 edition | 2024 edition |
|---|---|---|
| Plastic substrate | Basic requirements only | New special treatment for GRP/CFRP (Chapters 10-11) |
| Concrete panels | Not included | New Chapter 16 (EN 1766 standard) |
| Pretreatment methods | 5 types of cleaning methods | New flame treatment (Article 9.4) |
Key Material Processing Specifications
Steel Panels (Chapter 4)
The 2024 version strengthens the standardized process of mechanical grinding:
- Manual grinding: P220 silicon carbide sandpaper must be used, and the three-stage cross-grinding method must be followed
- Linear grinding: P100 aluminum oxide sandpaper is recommended, and the removal amount ≥0.05mm
Phosphate treatment case
A certain automotive coating laboratory used 4.7.2 amorphous iron phosphate treatment, and the solution temperature was controlled at 35±2℃. The coating adhesion was improved by 40% after treatment
Implementation recommendations
- Storage conditions: After cleaning, the panel should be stored in an environment with a relative humidity of 50±5% (Article 4.3)
- Plastic substrate activation: PP/EPDM materials must be flame treated (Article 9.4)
- Zinc layer protection: The pH value of the alkaline cleaning solution is strictly controlled between 11-12 (Article 6.3)
Technology evolution analysis
The cooperation between ISO/TC 35 and CEN/TC 139, the main drafting units of the standard, has promoted:
- The unification of composite material test methods (citing ISO 1268 series standards)
- Surface roughness measurement adopts the new ISO 21920-2 specification
- Environmental adaptability requirements are improved (new concrete substrate test)