A tensiometer is a laboratory instrument used to measure the surface or interfacial tension of a liquid. This physical property reflects the energy required to increase a liquid’s surface area and plays a crucial role in determining wetting behavior, adhesion, and the overall stability of a formulation.

In the ceramic industry, surface tension measurements are particularly important in the development of digital inks, glazes, and suspensions. Inappropriate tension values can negatively impact product distribution on the surface, lead to application defects, or affect color performance during firing.

Several measurement techniques are commonly used, including the Wilhelmy plate, pendant drop, and du Noüy ring methods. Each is based on observing how a probe (usually a plate or ring) interacts with the liquid surface, or analyzing the shape of a drop suspended under gravity. The measured tension is typically expressed in mN/m (millinewtons per meter).

In ceramic production, tensiometers are valuable tools for monitoring the surface and rheological properties of liquid materials. They support quality control and ensure process consistency, especially in digital printing, where precise fluid behavior is essential for reliable results.