Historical
ANSI/ASHRAE 41.4-1996 (RA 2006)
Method for Measurement of Proportion of Lubricant in Liquid Refrigerant
Sets forth procedures for experimently determining the weight concentration of miscible lubricant and liquid-refrigerant mixtures and, in limited cases, to immiscible mixtures.
American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. [ashrae]