ASTM D1290 Test Method for Sediment in Water-Emulsion Polishes by Centrifuge
4. Apparatus
4.1 Centrifuge and Tubes, conforming to Paragraphs 6.1 and 6.2 on Centrifuge and Centrifuge Tubes of Test Method D1796.
5. Sample
5.1 The sample shall be thoroughly representative of the material in question, and the portion used for the test shall be thoroughly representative of the sample itself.
6. Procedure
6.1 Measure 100 mL of the water-emulsion wax into each of two centrifuge tubes and stopper the tubes. Balance the two tubes in their holders.
6.2 Place the two tubes on opposite sides of the head and whirl for 10 min at a rate, calculated from the equation in Paragraph 6.1.3 under Centrifuge of Test Method D1796, sufficient to produce a relative centrifugal force (rcf) of between 500 and 700 at the tips of the whirling tubes (see Table 2, Rotation Speeds Applicable for Centrifuges of Various Diameters of Swing, of Test Method D1796 for relationship between diameter of swing, rcf, and rpm).
6.3 Read the volume of sediment in each tube, estimating to the nearest 0.1 mL if necessary. Record the average of the two readings as the percentage of sediment by the centrifuge method.
