Thickness decides most of what a buyer cares about: how many pieces fit in a carton, what the freight weighs, and whether one packer closes a gap or three of them do. Our flat range runs from 1 mm to 20 mm in three plate sizes, moulded in PP with a ribbed face.
The Three Plate Sizes
The family starts with a 100 x 28 mm strip for thin work and moves up to two plates, 100 x 72 mm and 150 x 100 mm. The strip is the one that goes behind a bead or under a small sash, where 28 mm of width is all the gap allows. The plates are for frame corners and sills, where the packer has to carry load across a wider face and stay put while the frame is adjusted.
What the Ribbed Face Does
Look closely at a plate and the face carries a fine rib pattern, with the size moulded into the centre. That texture is not cosmetic. A smooth PP face against a smooth frame can slide under vibration while the adhesive or foam cures, and the ribs give the two surfaces something to key into. On a vertical shim the effect is small. On a horizontal one under a sill it is the difference between a packer that stays where it was set and one that walks out before the frame is fixed.
How Thickness Changes Packing and Freight
| Thickness | Pieces per box | Weight per piece | Boxes per carton |
|---|
| 1 mm | 140 | 8.2 g | 8 |
| 2 mm | 95 | 18.8 g | 8 |
| 3 mm | 72 | 30.9 g | 8 |
| 5 mm | 40 | 51 g | 8 |
| 10 mm | 20 | 89.6 g | 8 |
| 20 mm | 10 | 213.9 g | 8 |
Those figures are for the 100 x 72 mm plate, where eight boxes make a carton of 33.5 x 27.5 x 24 cm. The 150 x 100 mm plate follows the same pattern with 144 pieces at 1 mm and 10 at 20 mm, packed four boxes to a carton. A carton of 1 mm packers holds fourteen times the piece count of a carton of 20 mm ones. The 20 mm piece weighs about twenty-six times as much, so a mixed order almost never fills a container evenly.
Stacking Two Thin Packers Instead of One Thick One
This is the question we get most often, and our answer is blunt. Stack if the gap is under 10 mm and the load is light, because two 5 mm packers are easier to trim to the opening than one 10 mm packer that is slightly wrong. Do not stack in a load path. Every extra interface is a place where the assembly can settle, and a settled packer means a frame that moves after handover. Above 20 mm we would rather quote a different product than sell you four plates to make one block.
FAQ
Which thickness should a stockist carry first?
The 3 mm in the 100 x 72 mm plate, plus 1 mm and 2 mm in the 100 x 28 mm strip. Most frame work needs a thin correction, and the plate handles the corners where a frame sits down on the substrate. Anything above 10 mm tends to be a project order rather than shelf stock.
Can flat packers be used under a structural steel column?
No. A PP packer is a spacer for frames, sills and beads, and it is not a substitute for an engineered steel shim. Where a structural connection needs packing, the shim belongs on the drawing as a specified item with its own load path, not as something a fitter adds on site.
Yifang Plastic moulds flat window packers in PP at its facility in Langfang, Hebei. The 100 x 28 mm flat packer and the mixed 1 to 6 mm packing shim set are listed with their packing options. The distributor view of the same range sits in a note for ANZ wholesalers and installation companies. For where a packer may sit in a US assembly, see ASTM E2112. Written by the Yifang technical team. AI tools were used to help draft this article from our own product data and photographs.
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