15mm Flat Glazing Packers

15mm Flat Glazing Packers are slim plastic glazing shims used to support and position insulated glass units during installation.

With a 15mm width and 100mm length, these FP15 packers sit between very narrow packers such as 9mm or 12mm and the more common 20mm flat packer range. This makes them useful where the glazing channel gives limited space, but the installer still wants a longer 100mm support surface under the unit.

These packers are commonly used as setting or location blocks to help keep the glass unit level, stable, and correctly positioned inside the frame. They can also be used for controlled spacing where small differences in rebate depth, frame alignment, or glass position need to be corrected on site.

Made from polypropylene, 15mm flat glazing packers are rigid, moisture-resistant, and designed to retain their shape under load.

Why installers choose 15mm Flat Glazing Packers:

• Slim 15mm width for narrower glazing channels
• 100mm length gives good support along the glass edge
• Useful where 20mm packers are too wide
• Helps position sealed units accurately inside the frame
• Suitable for use as setting blocks or location blocks
• Polypropylene construction for firm, non-compressible support

These FP15 glazing packers are a practical choice for installers who need a narrow flat packer with a full range of thicknesses for fine, standard, and heavier glazing adjustments.

What Each Thickness is Used For

1mm – Fine Correction & Final Positioning

Used when the glass unit needs a very small height or alignment adjustment.

Best for:

• Fine-tuning the glass position
• Removing slight unevenness
• Final levelling before beading
• Layering with thicker packers for exact adjustment

2mm – Small Gap Packing

Used where a light spacer is needed without making a major change to the unit height.

Best for:

• Minor rebate differences
• Small spacing corrections
• Light support under sealed units
• Narrow-channel glazing work

3mm – Everyday Slim Packer Support

A useful middle thickness for regular glazing jobs where a 15mm packer is the right width.

Best for:

• General sealed unit positioning
• Standard levelling work
• Supporting glass in slimmer channels
• Building up packer height in controlled layers

4mm – Moderate Height Adjustment

Used where the glass unit needs a more noticeable lift or correction.

Best for:

• Medium gap filling
• Levelling units in uneven rebates
• Supporting sealed units during fitting
• General trade glazing applications

5mm – Stronger Lift & Support

Provides more packer height where the unit needs additional support or spacing.

Best for:

• Larger gaps in narrow channels
• Heavier sealed units
• Base support under glass
• Correcting more visible level differences

6mm – Maximum Thickness in This Range

Used where the largest FP15 adjustment is required.

Best for:

• Deeper spacing requirements
• High support points
• Raising glass units to the correct position
• Installations where thinner packers are not enough