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ASTM D1698-97 Standard Test Method for Sediments and Soluble Sludge in Service-Aged Insulating Oils
standard by ASTM International, 10/10/1997
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1.1 This test method covers the determination of sediment and soluble sludge in service-aged insulating oils of petroleum origin. Also, provision is made for determining organic and inorganic content of the sediment. The method is intended primarily for oils of comparatively low viscosity; for example 5.7 to 13.0 cSt at 40