ASTM D4740 for cleanliness and compatibility of residual fuels by Spot test
6. Apparatus
6.1 Test Paper - Chromatographic paper cut or divided into appropriately sized squares, strips, or circles. Store the paper, without folding, rolling, or bending, in a tightly closed container.
6.2 Test Paper Support - Fig. 1 shows a suitable support for multiple samples spotted on the same test paper which shall be supported in a horizontal position so nothing touches test areas of the paper.
6.3 Oven - Any convection oven capable of maintaining an air temperature of 100 more or less 2°C.
6.4 Reference Spot Sheet - Adjunct for D4740.
6.5 Conical Flask, 100-mL capacity.
6.6 Heating Bath or Hot Plate, capable of heating sample to a temperature between 90 and 95°C.
6.7 Thermometer, general purpose Specification E 1 or equivalent.
7. Sampling
7.1 Samples for this test can come from tanks, lines, drums, or small containers. Use the applicable apparatus and techniques described in Practices D4057 or D4177.
