12mm Flat Glazing Packers are narrow plastic shims designed for spacing, levelling, and supporting glazed units during installation. With a 12mm width and 100mm length, these packers are useful where a standard 20mm, 24mm, or 28mm glazing packer may be too wide for the available space. They help installers achieve accurate positioning while keeping the glass unit properly supported. Made from polypropylene, these packers provide firm, non-compressible support and are suitable for use in glazing, door, conservatory, and curtain walling applications. Why installers choose 12mm Flat Glazing Packers: Ideal for narrow glazing channels and restricted fitting areas Helps level, space, and support glazed units Provides consistent adjustment during installation Durable, non-compressible, and moisture-resistant Suitable for windows, doors, conservatories, and curtain walling These packers are a practical choice when a slim but reliable glazing packer is needed for accurate unit positioning and long-term support. What Each Thickness is Used For 2mm – Light Levelling & Small Adjustments Used when only a small correction is required. Best for: Minor spacing adjustments Light levelling work Fine positioning of glazed units Small gaps in narrow glazing channels 3mm – Standard Everyday Packing A useful general-purpose thickness for regular glazing work. Best for: Everyday glazing support Standard levelling tasks General spacing under sealed units Common installation adjustments 4mm – Moderate Gap Filling Used where a slightly larger adjustment is needed. Best for: Medium spacing corrections Supporting glazed units in tighter channels Correcting uneven gaps General trade glazing work 5mm – Larger Adjustment & Stronger Support Provides extra lift and support where more spacing is needed. Best for: Larger gaps Heavier glazed units Stronger base support More noticeable levelling corrections
