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ASTM D6986-03

Current Revision

Standard Test Method for Free Water, Particulate and Other Contamination in Aviation Fuels (Visual Inspection Procedures)

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1.1 This test method covers two procedures for establishing the presence of suspended free water, solid particulate, and other contaminants in aviation gasoline and aviation turbine fuels.

1.1.1 Both procedures are intended primarily for use as field tests with the fuel at handling temperature.

1.1.2 Procedure A uses transparent sample containers; Procedure B uses opaque containers.

1.2 Both procedures are rapid methods for contamination detection and include ratings of haze appearance and particulate presence.

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.


The two procedures in the test method provide rapid methods for field detection of free water and solid contaminants, or any other visually apparent contamination. Uncertain or marginal results by either of these methods would normally result in the performance of methods such as D 2276, D 5452, or D 3240 for quantitative determination of contaminants.

5.1.1 Particulate determination in appearance tests is sensitive to sampling procedures. The presence of a small number of particles may indicate, for example, that the sample line was not flushed to provide a representative sample. The persistent presence of even a small number of particles, however, may be cause for further investigation depending on the situation.

Experience has shown that an experienced tester using a clear bottle can detect as little as 40 ppm of free, suspended water in the fuel. Thus, a fuel rated as clear and bright can still fail lower limits set by quantitative methods. A rater will also have difficulty resolving particles smaller than 40 μm. Smaller particles must be determined by other than visual methods such as D 2276, D 5452 or chemical field tests listed in Manual 5.5

Experience has shown the visual appearance of fuel in a white porcelain bucket to be the most suitable method for the detection of dye contamination or other unusual discoloration. In the U. S., the white porcelain bucket is used to detect the dye.

SDO ASTM: ASTM International
Document Number D6986
Publication Date Dec. 1, 2003
Language en - English
Page Count 5
Revision Level 03
Supercedes
Committee D02.J0
Publish Date Document Id Type View
Dec. 1, 2003 D6986-03 Revision
May 1, 2020 D6986-03R20 Reaffirmation
Oct. 1, 2016 D6986-03R16 Reaffirmation
July 1, 2010 D6986-03R10 Reaffirmation