Category: Technical Insight

Water contact angle (WCA) describes the shape a droplet of water forms when placed on a surface. If the water spreads out, the water contact angle is low. If it beads up, the water contact angle is high. This matters because the way a liquid wets a surface strongly affects processes such as adhesive bonding, […]

A sessile drop refers to a liquid droplet that’s placed on a solid surface. The term stems from Latin sessilis, meaning “sitting,” emphasising that the drop remains stationary on the substrate. It’s literally attached at its base, offering a stable configuration for optical analysis. The sessile drop method is a technique we very commonly use for […]

Measuring and controlling organic contamination prior to welding is essential for producing defect-free, high-quality welds. The presence of organic contaminants can lead to serious weld defects, including porosity and poor mechanical properties such as cracking. By employing proper testing and cleaning techniques, manufacturers can improve weld integrity, enhance product reliability, and extend the lifespan of […]

We have added a Technical Bulletin to the website entitled How to clean and store a du Noüy ring. We get asked this question a great deal, so it’s knowledge worth spreading around. Please download and share with your colleagues.

Our latest white paper is from Conor Kelly, who answers the question What’s the difference between surface tension and surface energy? In an application where adhesion is required (printing, bonding, sealing, painting, coating, etc), understanding the surface tension and the surface energy of the components – and, crucially, the difference between them – can be […]

We have just published a White Paper, entitled Detection of Organic Contamination on Surfaces by Fluorescence Measurement. Written by colleagues from SITA Messtechnik GmbH, André Lohse and Tilo Zachmann, it is based on abstract to a conference speech at the 12th European Conference for Non-Destructive Testing in Gothenburg, Sweden, June 2018. The article describes how […]

What is the best cleaning power worth if the cleaning bath contains oil that re-contaminates the parts?  By simply measuring the contamination level process, reliability can be increased as well as improving cost-effectiveness. An increasing level of contamination caused by grease or oil left by machined parts in cleaning baths will cause a decrease in […]