Abstract: A double locked safety door barrier is provided, which includes a door frame and a door leaf hinged inside the door frame. A switch housing is provided on the door leaf, an upper locking tongue and a lower locking tongue are respectively provided in the switch housing and at a bottom of the door leaf. An upper locking buckle and a lower locking buckle are provided on the door frame; an upper unlocking component and a lower unlocking component are respectively provided on the switch housing. The lower unlocking component is connected to the lower locking tongue through a connector and is provided with a two-way lock structure that can only be driven to be retracted by pressing the upper unlocking component after pressing the lower unlocking component. The two-way lock structure simplifies the user's operation process and increases the safety of a locker.

Abstract: Abstract: A TPO roofing membrane including an extruded TPO material with a fatty acid amine such as erucamide added to reduce surface energy for increased stain resistance.