What does thixotropic mean?
Thixotropic describes a material whose viscosity changes with the stress applied to it. At rest, such a material may be thick and gel-like, but shaking, stirring, brushing, or other shearing can make it flow more readily. When the stress is removed, it often thickens again. This behavior is useful in products that must be easy to apply but remain stable afterward, including paints, coatings, inks, cosmetics, and some industrial gels. The term is mainly used in technical and scientific contexts, especially rheology and materials science. It is related to the idea of shear thinning, although thixotropy also specifically implies a time-dependent change that can be reversible. Understanding the word helps explain why a substance can feel solid in a container yet spread easily when worked with a tool or under motion.
adjectiveHaving the property of becoming less viscous or more fluid when subjected to agitation or shear stress, often returning to a thicker state when the stress is removed.
- Describing a material or substance whose viscosity decreases under agitation or shear stress and may increase again when the stress is removed.
"The paint is thixotropic, so it flows easily under the brush but becomes firm again on the surface."
"The coating was formulated as a thixotropic paint to prevent sagging during application."
"Researchers used a thixotropic gel to study how its internal structure changes under shear."
Stir it and it may flow; stop, and it thickens again—that time-dependent transformation is what makes a material thixotropic.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does thixotropic come from?
The word combines Greek thixis, meaning “touch,” with Greek tropē, meaning “turning” or “direction,” through the scientific term thixotropy. It entered English as a specialized description in the study of rheology and related fields. The related noun thixotrope denotes a substance that exhibits this behavior.
Related word forms
How thixotropic is actually used
This is primarily a technical term in rheology, materials science, coatings, paints, inks, cosmetics, and related fields. It is formal and specialized rather than everyday vocabulary, and it is used in both British and American English.
Easily confused with thixotropic
Isotropic describes a material whose properties are the same in every direction, whereas thixotropic describes a material whose viscosity changes when it is sheared or agitated.