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Paint products: Accelerated stability and quality testingPart I: Direct measurement of separation and segregation by multisample analytical centrifugation

SpecialChem / Jul 18, 2007

To assure continued consumer satisfaction the following stability issues of paint products have to be minimized or avoided: 1. Syneresis - separation of the liquid dispersion media 2. Pigment segregation - change of colour composition inside a container 3. Particle segregation - change of particle size distribution inside a container These stability issues have to be addressed not only during development of new paint products but also for quality assurance during production on a regular basis. This application note demonstrates that multisample analytical centrifugation can be used as an efficient tool for the accelerated evaluation of separation stability of paint products. In addition this technique provides for high resolution data of particle size distributions of pigments or emulsions. The LUMiFuge® / LUMiSizer® instruments employ the STEP-Technologyâ„¢, which allows measuring the intensity of the transmitted light as function of time and position over the full sample length simultaneously.

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