ASTM D117-22

1.1''This guide describes methods of testing and specifications for electrical insulating liquids intended for use in electrical cables, transformers, liquid-filled circuit breakers, and other electrical apparatus where the liquids are used as insulating, or heat transfer media, or both.

1.2''The purpose of this guide is to outline the applicability of the available test methods. Where more than one is available for measuring a given property, their relative advantages are described, along with an indication of laboratory convenience, precision, (95'''% confidence limits), and applicability to specific types of electrical insulating liquids.

1.3''This guide is classified into the following categories: Sampling Practices, Physical Tests, Electrical Tests, Chemical Tests, and Specifications. Within each test category, the test methods are listed alphabetically by property measured. A list of standards follows:

Category	Section	ASTM Standard
Sampling:	'''3	D923
Physical Tests:	''	''
'''Aniline Point	'''4	D611
'''Coefficient of Thermal Ex- ''''''pansion	'''5	D1903
'''Color	'''6	D1500
'''Examination: Visual Infrared	'''7	D1524, D2144, D2129
'''Flash and Fire Point	'''8	D92
'''Interfacial Tension	'''9	D971
'''Pour Point of Petroleum ''''''Products	10	D97, D5949, D5950
'''Particle Count in Mineral ''''''Insulating Oil	11	D6786
'''Refractive Index and Specific ''''''Optical Dispersion	12	D1218
'''Relative Density (Specific ''''''Gravity)	13	D287, D1217, D1298, D1481, D4052
'''Specific Heat	14	D2766
'''Thermal Conductivity	15	D2717
'''Viscosity	16	D445, D2161, D7042
Electrical Tests:	''	''
'''Dielectric Breakdown Voltage	17	D877, D1816, D3300
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