Since 2002, Mercury Glazing has been a proud manufacturer of British PVC-U and aluminium products. We manufacture high quality windows and doors for both commercial and residential uses. Mercury Glazing’s elegant aluminium bifold doors are manufactured from Smart Architectural Aluminium, one of Great Britain’s leading suppliers of bespoke aluminium extrusions.. They are available in a variety of RAL colours, plus they incorporate the latest secure locking systems for your peace of mind.