the actual weight of a container and other materiel used for packaging its contents; i.e., gross weight less net weight. Actual Tare is determined by taking the sum of the weight of each container and its packaging materials. Average Tare is determined when one container and its packaging materials are weighted as a sample. Estimated Tare is determined when a fixed percentage is allowed, mass of empty container including all fittings and appliances associated with a particular type of container in its normal operating condition, i.e. in the case of a mechanically refrigerated container: with its refrigeration equipment installed and, when appropriate, full of fuel