ASTM D1290-95 (R2021) pdf free download.Standard Test Method for Sediment in Water-Emulsion Polishes by Centrifuge.
1.1 This test method covers the determination of sediment in water-emulsion polishes by means of a centrifuge.
1.2 The values stated in SI units are to he regarded as standard. No other units of measurement are included in this standard.
2. Referenced Documents
2. 1 ASTM Standards.
D 1796 Test Method for Water and Sediment in Fuel Oils by the Centrifuge Method (Laboratory Procedure)
3. Significance and Use
3.1 This test method determines the amount of sediment in water-emulsion polishes. Sediment is generally believed to have negative effects on water-emulsion polish properties.
4. Apparatus
4.1 Centrifuge and Tubes, conforming to Paragraphs 5.1 and
5.2 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 miii at a rate, calculated from the equation in Paragraph 5.1.5 under Centrifuge of Test Method Dl 796, sullicient 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.
7. Precision and Bias
7.1 Precision—lnterlahoratory and intralahoratory duplicate determinations of sediment by this test method should not differ by more than 0.2 mL.
7.2 Bias—This test method has no bias because the results developed are defined in terms of this test method.
8. Keywords
8.1 centrifuge; polishes; sediment; water-emulsions.ASTM D1290 pdf download.