The coatings industry covers several sub-sectors including architectural coatings, industrial coatings, automotive paints, powder coatings, and UV-curable coatings. While testing needs vary widely, the core equipment systems are quite similar. A fully-equipped coatings lab needs to cover four main aspects: rheological properties, thermal properties, mechanical properties, and durability.

Rheological properties are the key focus in coating testing. A rotational rheometer/viscometer measures the shear-thinning behavior, thixotropy (flow leveling and sag resistance after brushing or spraying), and yield stress of coatings—these parameters directly affect application performance and the final coating finish. For coatings with high filler content, it’s also important to look at viscosity changes under different shear rates.

For thermal properties, DSC measures the coating’s Tg (which relates to the balance of film hardness and flexibility) and curing reaction characteristics. In powder coatings, the DSC curing kinetics curve is essential for determining baking processes. TGA is used to measure solvent content, filler content, and thermal stability of the coating.

Mechanical and durability testing: A universal testing machine with coating adhesion fixtures measures adhesion (cross-cut/pull-off methods), pendulum hardness testers and pencil hardness testers measure film hardness, salt spray chambers evaluate corrosion resistance, and QUV weathering testers assess weatherability.

Composition and microanalysis: FTIR identifies resin types and additives, and particle size analyzers measure pigment and filler particle size distribution.

Dehuisci (www.dehuisci.com) represents brands like TA, Mettler Toledo, Instron, and Thermo Fisher, providing full solutions for coatings companies. Phone: 0512-67071902.