The standard "ISO 1514 Paints and varnishes - Standard panels for testing," developed by the International Organization for Standardization (ISO), defines various types of standard panels and describes preparation procedures before painting. This standard is for use in general test methods for panels, paints, varnishes, and related products.
In this standard, the following types of standard panels are specified:
Panels made from other materials and with other preparation procedures may be used by agreement when specified for the product being tested.
Steel panels intended for general testing (as opposed to panels intended for testing specific applications and uses) should be manufactured from flattened mild steel in sheet or strip form. The steel used should be free of rust, scratches, blemishes, discoloration, and other surface defects. The physical dimensions of the panel should be as stated in the test method description or as otherwise agreed upon between the buyer and seller. Unless otherwise agreed upon between the buyer and seller, the steel should be one of the types specified below. Certain types of testing may require the use of a thicker steel than that specified for the types listed below.
Before preparation, panels should be stored in a way that protects them from corrosion. Suitable methods include wrapping the panels in paper treated with a vapor-phase inhibitor and storing them in a neutral light mineral oil or hydrocarbon solvent free of additives. For example, panels can be completely immersed in oil or coated with oil and then individually wrapped in oil-impregnated paper. Alternatively, panels can be stored in a desiccant containing an active desiccant (e.g., silica gel).
The panel is wiped to remove excess oil and then thoroughly washed with a suitable solvent to remove all traces of oil. Fast-evaporating solvents may be used, as long as they are not acidic or alkaline and avoid toxicity hazards.
Panels can be cleaned with a commercially available aqueous alkaline cleaner. Spray cleaning is recommended, but immersion cleaning is also acceptable. Cleaner concentration and temperature should be maintained in accordance with the manufacturer's recommendations.
Some testing applications require a more uniform and reproducible surface than that present on mill-rolled steel. In such cases, it is necessary to remove surface variability and contamination through mechanical abrasion. To ensure complete removal of contamination and variation, the original mill surface must be completely removed. The amount of surface removal required will depend somewhat on the original surface profile, but should never be less than 0,7 µm.
Before etching, the panels should be cleaned as described herein. Unless otherwise agreed, surface removal should be carried out as described herein. By prior agreement, a mineral solvent may be used as a lubricant during etching operations.
Hand etching involves manually etching the panel using P220 silicon carbide paper. A suitable sequence for hand etching is as follows:
Circular mechanical abrasion involves mechanically polishing the panel using P220 silicon carbide paper. Using this method, the panel is polished using a circular motion approximately 80 mm to 100 mm in diameter. The process is considered complete when no signs of the original surface or any waviness are visible.
Linear grinding involves a conveyor system that uses an abrasive belt mounted on a vertical grinding head to remove the original milled surface and create a linear scratch surface on the panel. Grinding the surface with abrasive belts removes contamination and provides a smoother and more reproducible surface than a typical milled surface. P100 aluminum oxide abrasive belts are suitable for this process. The surface roughness of the polished panel should be between 0,50 µm and 1,14 µm.
Worn panels are examined to ensure that the original surface has been completely removed.
Our organization, which has been supporting businesses across all sectors for years through a wide range of testing, measurement, analysis, and evaluation activities, has a strong team of employees who closely follow global developments in science and technology and are constantly improving themselves. In this context, we also provide testing services in accordance with the ISO 1514 Paints and varnishes - Standard panels for testing.
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