This European standard specifies the equipment and procedures for determining the long term water absorption of test specimens . It is applicable to thermal insulating products. This European standard specifies two options : Method 1 – partial immersion Method 2 – total immersion The long term water absorption by partial immersion is intended to simulate the water absorption caused by long term water exposure . The long term water absorption by total immersion is not directly related to the conditions site , but has been recognized as a relevant condition of test for some products in some applications .