Defines the test method for the determination of moisture penetration index and specifies the requirements for limit values for insulating glass units made: (a) in accordance with prEN 1279-1:2015, and prEN 1279-6:2015 or, (b) for the purpose to demonstrate that components (e.g. edge seals or spacers) will allow the insulating glass prEN 1279-6:2015 or unit to conform to the requirements given in prEN 1279-1:2015.