This standard specifies a classical method for determining the melting point of plant oils and fats based on the capillary tube method. The core of the procedure involves sealing a pre-prepared solidified fat column in a glass capillary tube of specific specifications, heating it in water at a constant rate of approximately 0.5°C per minute until the sample completely melts and becomes transparent, and recording the temperature at this point as the melting point. This method relies on a series of conventional and precise instruments, including glass capillary tubes for sample preparation, a refrigerator, and a precision mercury thermometer (or an electronic thermometer of equivalent accuracy) along with a constant-temperature water bath for the determination. This standard represents a comprehensive technical update and revision of the original 1985 edition method.