Coefficient of Thermal Expansion / Coefficient of Linear Expansion - CLTI

The Coefficient of Linear Thermal Expansion (CLTE, often referred to as "α") is a material property that characterizes a material's ability to expand under the influence of elevated temperatures.The linear coefficient 'CLTE or α' of the material is calculated as follows:

α = ΔL / (L₀ * ΔT)

Among them:

• α is the coefficient of linear thermal expansion per degree Celsius
• ΔL is the change in specimen length due to heating or cooling
• L₀is the original length of the specimen at room temperature
• ΔT is the temperature change during the test, °C

Thus, α is obtained by dividing the linear expansion per unit length by the temperature change. When labeling the average coefficient of thermal expansion, the temperature range must be specified.

Table of coefficients of thermal expansion of common materials #