September 17, 2007 - In this week's search of the week video we highlight Coefficient of Linear Thermal Expansion (CLTE also known as ASTM D696). CLTE is measured using a silica dilatometer. A specimen is placed inside a silica tube and silica rod is inserted into the tube. A dial gage or similar device is attached to the rod. Click to continue to our plastics properties and test methods library.