The ISO 23706-2020 standard provides a method for determining the apparent activation energy (Ea) of plastics in photochemical degradation tests based on the Arrhenius model. Activation energy is a key parameter describing the energy required for chemical reactions and is crucial to understanding the effect of temperature on the degradation behavior of materials. The standard helps to improve the Reliability and predictability of artificial weathering tests by performing efflorescence experiments at two different temperatures. The standard highlights the application of the Arrhenius principle in determining thermal and photochemical degradation of polymers and describes the associated test requirements and methods to quantify the temperature effect in different efflooming experiments.