Asphalt must be stored at specific temperatures, which are usually somewhat higher than the temperatures at which the asphalt is applied. The asphalts used in seal coat work are stored at the following approximate temperatures:

The higher temperatures are the maximum allowable storage and heating temperatures.

In order for these asphalts to be sprayed properly, with the desired results, the temperature must be closely controlled in order to maintain the correct viscosity for spraying. The heater unit operator must clearly understand the importance of the viscosity-temperature relationship.

The heating and storage unit must be equipped with a continuous recording thermometer so that the temperature of the asphalt may be closely monitored.