How Glass, Ceramic and Stone Exporters Cut Breakage With Edge Protection

Published 9 September 2026 · Updated 27 September 2026 · By Ranjeet Kumar, Proprietor, Solution Enterprises

Short answer: cap the flat bundle edge with a U channel so the strap never touches glass or stone, put L boards on the vertical corners of the crate, and specify higher ply than you would for cartons. The comparison here is not against a cheaper board — it is against a broken slab.

Why a chip is not a cosmetic problem

Glass and stone fail from a defect outwards. A chip on an edge is a stress concentrator: under the ordinary flexing of transport it grows, and the crack runs across the sheet. The consignee does not see a small chip, they see a cracked sheet, and it is often found at installation rather than at goods-in.

That is why this sector is the highest-value use of edge protection there is. A board that costs a few rupees is standing between a strap and a slab worth thousands.

The geometry problem

Sheets and slabs travel on edge, in bundles. The bundle presents a long, thin exposed edge with a face on either side. An L board only reaches one face — and the strap, which is tensioned across the bundle, lands on the other one.

A U channel caps all three surfaces. The strap then bears on board across the full bundle width, and no point load ever reaches the outermost sheet.

Sizing the channel

• Internal width — bundle thickness plus clearance. Too tight and it will not seat over the bundle; too loose and it rocks under vibration, which is the same as not having it.
• Leg height — how far the channel comes down each face. On slab and sheet work a taller leg is usually worth the extra board, because it also protects against handling contact, not just the strap.
• Thickness and ply — higher than you would use on cartons. This is one of the few cases where over-specifying is the cheaper error.

Send us the individual sheet thickness and how many sheets go in a bundle, and the internal width follows from that rather than from a guess.

When you ship many sheet thicknesses

Processors who cut several thicknesses of glass or stone face a real stocking problem: a channel for every bundle width soon becomes a store full of part numbers. The usual answer is to group bundle widths into a few bands and give each band one channel, sized to the widest bundle in it. Within a band, the narrower bundles need a little packing to stop the channel rocking — a folded strip of board works — and the packing must go in before the strap, not after.

Keep the bands few and write them on the packing instruction, so the person at the bench matches a bundle to a channel from a list rather than from memory.

Both, not either

A typical glass or stone despatch needs U channel on the long exposed edges and L boards on the vertical corners of the crate or stack. They solve different halves of the same problem.

Ordering only one of the two is the most common reason a consignment that “had edge protection” still arrived chipped. If your damage photographs show chips along the long edge, the U channel was missing. If they show damage at the crate corner, the L board was.

Moisture, and an honest caveat

Dry kraft against glass or polished stone is normally fine. Prolonged damp contact can mark a polished surface, as it can with any board. If your lane involves open-deck transport in monsoon, or slabs standing in a yard for weeks, say so when you enquire — that changes what we recommend, and occasionally it means a different material entirely.

Assembling the load in the right order

Sequence matters as much as the components. A channel slid into place after the strap is already tight has missed the moment it was needed.

1. Stand the bundle on the crate floor or pallet with whatever interleaving your process already uses between sheets.
2. Seat the U channel over the long top edge, and over any other exposed edge a strap will cross, before a strap goes anywhere near it. Run a hand along it to confirm it sits fully down rather than riding on a high spot.
3. Fit L boards to the vertical corners of the crate or stack, running full height.
4. Position each strap so it crosses the channel, never the joint where two channel lengths meet. If one length cannot cover the whole edge, butt the pieces tightly and keep straps clear of the join.
5. Tension, then check every channel again. A channel lifted at one end by the strap has turned back into a point load.
6. Mark the load clearly for orientation, so anyone restacking it at a transhipment point knows which way it must stand.

Reading your own damage reports

Photographs from consignees are the cheapest diagnostic tool you have, provided someone reads them with the load build in mind.

Where the damage is	Likely cause	What to change
Chips on the long edge directly under strap positions	Strap bearing on the product; channel missing or too short	Channel along the full exposed edge
Chips between strap positions	Channel rocking because the internal width is too loose	Re-size the internal width to the bundle
Damage at the crate corners	Contact during handling or stacking	Full-height L board on each vertical corner
Cracks starting mid-sheet with clean edges	Bending or impact, not an edge problem	Review support and bracing inside the crate
Marks on polished faces	Damp contact or movement against the board	Check storage and lane moisture, and the interleaving

Putting a rupee value against each row is what gets heavier board approved. The packaging damage cost calculator does that from your own claims, which makes the conversation with finance far shorter.

What changes when the load is exported?

Glass and stone commonly travel in timber crates or on timber pallets, and that timber needs ISPM-15 treatment and a legible mark. The paper edge protection does not: ISPM-15 applies only to wood packaging material, so adding or upgrading board never adds a compliance step. Whether the whole load could move onto a paper pallet is a separate question, and for dense slab loads it deserves a specific enquiry rather than an assumption either way.

For documentation and container planning on export lanes, start with the export packaging section.

Where this sits

The Bulandshahr Road belt in Ghaziabad, and the Jaipur stone and handicraft cluster, are the two concentrations we see most of this work from. Sector detail is on the glass, ceramic and stone page, and the channel product is U shape edge protector.