ASTM D4682 Standard Specification for Miscibility with Gasoline and Fluidity of Two-Stroke-Cycle Gasoline Engine Lubricants
1. Scope
1.1 This specification describes four categories of lubricants intended for use in two-stroke-cycle spark-ignition gasoline engines based on their miscibility with gasoline and their low-temperature fluidity.
1.2 The following safety hazards caveat pertains only to the test methods described in this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
1.3 The values for temperature, pressure, and so forth stated in SI units are the standard.
2. Referenced Documents
2.1 ASTM Standards:
D97 Test Method for Pour Point of Petroleum Products
D439 Specification for Automotive Gasoline
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and the Calculation of Dynamic Viscosity)
D874 Test Method for Sulfated Ash from Lubricating Oils and Additives
D2983 Test Method for Low-Temperature Viscosity of Automotive Fluid Lubricants Measured by Brookfield Viscometer
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 fluidity - of two-stroke-cycle gasoline engine lubricants, following industry practice, this term is used to designate the absolute viscosity in millipascal•seconds (centipoises) of the lubricant under test. In general usage, fluidity is the reciprocal of absolute viscosity.
3.1.2 miscibility - of two-stroke-cycle gasoline engine lubricants, an inverse function of the time required for a fuel and lubricant introduced into the apparatus as separate phases to produce a single-phase mixture by agitation under controlled conditions.
4. Classification
4.1 The candidate oils are classified into Categories 1 through 4 according to the temperature at which the tests are conducted; respectively, 0°C (32°F), -10°C (14°F), -25°C (-13°F), and -40°C (-40°F). Each category has its own reference oil, which is the same for both the miscibility and fluidity tests.
5. Qualification Requirements
5.1 Miscibility - When tested in accordance with Section 6, candidate oils that mix with the gasoline in not more than 110 % of the number of inversions of the apparatus required to mix the reference oil, and that do not separate on standing, qualify as miscible.
5.2 Fluidity - When tested in accordance with Section 7, candidate oils meet the requirements for fluidity if their viscosity is not more than 10 % higher than that of the reference oil.
