October 21, 2026 | Knowledge Sharing
Two emboss depths come up in almost every enquiry: 0.06–0.08 mm on fridge side panels and back panels, 0.15 mm on freezer liners. Buyers who hear both sometimes assume one of them is a mistake. Neither is. Two product families, two different jobs — and the depth follows the job.
The confusion underneath is real, though, and it is worth clearing up before the purchase order gets written.
| Product | Where it goes | Pattern height on the sheet |
|---|---|---|
| Fridge side panel / back panel | Outer cabinet, flat plate, 0.30–0.50 mm stock | 0.06–0.08 mm |
| Fridge / freezer liner | Inner box, deep-drawn, heavier stock | 0.15 mm |
A side panel is a flat plate. The pattern is there for three reasons — stiffness, hiding roll marks, and giving the paint something to key into. None of those needs much depth, and going deeper costs formability and makes the face harder to wipe. 0.06–0.08 mm covers all three.
A liner is a different animal. It is drawn far deeper, it is the surface a customer looks at every time the door opens, and the pebble relief has to come through the draw without flattening out. That is why liner stock runs a heavier gauge and a deeper pattern — 0.15 mm.
Three different quantities get quoted as "depth". Only one of them describes the sheet you receive.
| Quantity | Where it is measured | Typical value |
|---|---|---|
| Roll engraving depth | On the embossing roll surface, peak to valley of the etched pattern | Larger — the roll is a tool, not the product |
| Pattern height on the sheet | On the finished panel, peak to valley of the transferred pattern | 0.06–0.08 mm side panel · 0.15 mm liner |
| Paint film thickness | Coating on the flat area between pattern peaks | 18–25 μm primer + top coat |
Transfer is never 1:1. The roll presses into a paint film that has already been cured, on a steel substrate that resists displacement, so what lands on the sheet is shallower than what is cut into the roll. Quoting roll depth as sheet depth is the single most common source of this argument.
The quickest way to test a number is to ask how much steel is left under the valley. Press 0.15 mm into a 0.30 mm sheet and 0.15 mm remains — half the gauge, before paint. A panel like that dents under a thumb and cracks at a T-bend. Which is exactly why liner stock is not 0.30 mm: if the pattern is 0.15 mm, the base has to be heavier to carry it.
Run 0.06–0.08 mm into that same 0.30 mm sheet and 0.22–0.24 mm is left. That is the pairing behind most fridge side and back panels on the market, and it is why the shallower depth is not a compromise — it is the number that fits the gauge.
So when a depth sounds impossible for the thickness, the first question is not whether the supplier is lying. It is which product family the number came from.
1. Reference-plate comparison with a micrometer. The cheapest field method. Take one flat, unembossed sample of the same nominal gauge and one embossed sample, and read both with the same micrometer at several matched points. The difference in reading is an approximation of pattern height — but only if the two samples really are the same gauge, because the micrometer cannot tell a pattern peak from a thicker coil. This method also compresses the pattern slightly under the anvil, so it reads low.
2. Dial indicator sweep. Clamp the sheet on a flat bed, run a small-radius stylus across the surface and read peak-to-valley on the dial. Better than a micrometer because it follows the surface instead of squashing it, and it is fast enough for a line check.
3. Surface profilometer. The only method that produces a number you can put in a contract. A stylus traverse gives Ra, Rz and a profile trace, so pattern height and roughness are separated properly, and the trace can be attached to the inspection report. If a customer's engineering team is going to check your claim, this is what they will use.
Pattern height is not decoration. Three things scale with it:
Name the part and the depth together, and say how it is measured:
"Fridge side panel, orange-peel emboss. Pattern height on finished sheet 0.06–0.08 mm peak-to-valley, measured by stylus profilometer on the coated surface; report to accompany each lot."
A bare "0.15 mm emboss" tells the mill nothing about what you are making. That is how a liner pattern ends up on a side panel order, or the reverse. State the part first, then the depth.
Depth belongs to the product, not to the roll. Side panel 0.06–0.08 mm, liner 0.15 mm — and always ask where the number was measured.
