Testing techniques we use.
QUALIFICATION TEST (DECLINING)
The qualification test is performed to determine the appropriate extraction conditions for a component or a group of similar components (family of components) and define an “inspection specification”.
By carrying out repeated extractions of a component, it can be determined if the amount of recovered particles is decreasing and, therefore, if the extraction method applied is adequate.
This test is used to determine the total mass of particulate loading extracted from a test component by weighing the test filter with a balance before and after performing an extraction.
The result of the gravimetric analysis is called the residue weight and represents an integral value. Gravimetric analysis does not provide information on the quantity, size or nature of the particles in question and, therefore, although it may be necessary, by itself it provides little information and is often combined with additional analyzes such as For example, optical analysis.
Standard analysis is used to validate the cleanliness specifications established in the customer-supplier relationship.
Standard analysis is by light microscopy and may or may not include gravimetric analysis if specified.
The filter containing the particles extracted from the test sample is examined using a suitable light source and its image is enlarged by a magnifying lens and a pixelated image is generated.
With an image processing program, the particles are identified and their size and characteristics are determined. Therefore, the standard analysis allows to measure, count and determine the size of the particles.
With the extended analysis, which is carried out through SEM/EDX electron microscopy, information is obtained on the chemical composition of the particles and, consequently, on their possible origin.
Extended analysis is applied in the field of process optimization and root cause investigation to obtain complementary information on the origin of particles.
SEM/EDX analysis is a combined analysis technique that counts and measures particles using a scanning electron microscope (SEM) and determines their material composition using energy dispersive X-ray spectroscopy (EDX).
By assigning the particles and their size to specific material classes, complementary information about their potential for damage or possible source of origin can be obtained.
SURFACE TENSION MEASUREMENT
Surface contamination, especially that resulting from metal alloys formed in the course of the production process, reduces the adhesion of paints, adhesives, or galvanized coatings.
Clean surfaces have a specific surface tension for each material. Clean surfaces have a high surface energy, while in the case of contaminated elements the surface energy turns out to be much lower.
One of the quick and easy methods to determine surface cleanliness is to test surface tension by applying test inks/markers.