28mm x 100mm Flat Plastic Glazing Packers – Colour-Coded Shims for Windows & Doors | Made in UK

Professional 28mm x 100mm glazing packers, colour-coded by thickness for fast, accurate window and door installation. Made in the UK from 100% recyclable polypropylene — the choice of professional installers nationwide.

Each pack contains flat plastic shims in a single thickness, sized for standard UPVC, aluminium, and timber frames. Colour-coded for instant on-site identification, eliminating guesswork when selecting the right shim for your rebate depth.

Colour Code Guide

• 1mm — Green: Fine adjustment for lightweight timber sash windows and heritage installations
• 2mm — Black: Shallow rebate shimming and secondary glazing alignment (rebate depth 15–20mm)
• 3mm — White: Industry standard for UPVC double glazing — suits most domestic installations (rebate depth 20–25mm)
• 4mm — Grey: Deeper rebate frames and heavier units up to 500kg, aluminium and commercial applications (rebate depth 25–30mm)
• 5mm — Blue: Wide-frame profiles, premium aluminium systems, and high-specification installations (rebate depth 30mm+)
• 6mm — Red: Maximum depth specialist installations, heritage timber, coastal and architectural projects

Product Specification

• Width: 28mm
• Length: 100mm
• Material: Rigid polypropylene — waterproof, load-bearing, reusable
• Pack sizes: 60, 120, 300, or 1,000 per pack — trade quantities available
• Manufactured: UK — FENSA-grade quality
• Frame compatibility: UPVC, aluminium, and timber

Order by thickness and pack size. Mixed packs (1mm–6mm assorted) also available for trade toolboxes and multi-project use. Bulk pricing for 1,000-pack orders.