Determination of Oil Absorption of Titanium Dioxide

Ti-Pure® TITANIUM DIOXIDE DETERMINATION OF OIL ABSORPTION (OA) METHOD: T4400.010.06.WP

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TITANIUM DIOXIDE (Ti-Pure®) Determination of Oil Absorption

I. Principle The oil absorption of a sample of titanium dioxide pigment is measured by determining the minimum amount of linseed oil which when worked into the pigment will change the mass from a comparatively dry state to one where all the particles cling together as a plastic mass and is measured as lbs. oil per 100 lbs. of TiO2. The calculation uses two standards of known oil absorption. II. Applicability This test may be used to measure the oil absorption (OA) of any grade of titanium dioxide pigment. III. Limitations The most important part of the test is to work the oil into the TiO2 pigment with a spatula and this must be the same from sample to sample. IV. Sensitivity, Precision and Accuracy A. Sensitivity Not applicable. B. Precision 1. Single Operator _ The average analysis (X), standard deviation (s), and 95% confidence limits (95% CL) established for the single operator precision of the method were as follows:

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_ X OA 15.28

s 0.29

95% CL ± 0.68

The above data were calculated from eight replicate analyses of the same sample by the same technician in one day. 2. Multiple Operator _ The average analysis (X), standard deviation (s) and 95% confidence limits (95% CL) established for the multiple operator precision of the method were as follows: _ X s 95% CL OA 27.36 0.68 ± 1.35

The above data were calculated from 32 replicate analyses of one sample performed by 8 technicians, two tests on each of two days. C. Accuracy No data are available; however, the method has proved satisfactory. V. Special Apparatus (Equivalent apparatus may be substituted) 1. Smooth tempered glass plate, 18 inches square minimum x 1/4 inch, anchored to the table. Edges and corners should be ground smooth. Obtain locally. 2. A two place top loading balance, scoop, etc. Accuracy good to 0.01 g. (Top-loading...