ASTM D117-18

1.1 This guide describes methods of testing and specifications for electrical insulating liquids intended for use in electrical cables, transformers, liquid 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 oils.

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, D2285
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, D1807
Relative Density (Specific   Gravity)	13	D287, D1217, D1298, D1481, D4052
Specific Heat	14	D2766
Thermal Conductivity	15	D2717
Turbidity	16	D6181
Viscosity	17	D445, D2161
Electrical Tests:
Dielectric Breakdown Voltage	18	D877, D1816, ASTM D8176-18(2023) Standard Test Method for Mechanically Tapped Density of Activated Carbon (Powdered and Fine Mesh) $25.00 $50.00 Add to Cart ASTM E2952-23 Standard Specification for Air-Purifying Respiratory Protective Smoke Escape Devices (RPED) $31.00 $63.00 Add to Cart ASTM E1794-22 Standard Specification for Adhesive for Bonding Foam Cored Sandwich Panels (200 oF Elevated Humidity Service), Type II Panels $28.00 $56.00 Add to Cart ASTM C406/C406M-22 Standard Specification for Roofing Slate $24.00 $48.00 Add to Cart