This standard specifies in detail the method for determining the storage stability of water-in-oil emulsions, which applies to dry water-in-oil emulsions. The summary of the method involves taking a 100 mL sample and placing it in an oven at 85 ° C for thermostatic 48 hours or 96 hours, and then measuring the amount of oil and water separation and the water content in the upper and lower layers of the sample. Stability of water-in-oil emulsions during storage and normal use can be assessed by this standard. The required instruments include a temperature-controlled oven with blast, a measuringflask, a pipette, a Microsyringe, a thin-mouth glass bottle and a rubbersuction bulb.