Choosing Honeycomb Paper Cushioning: Cell Size, Paper Grade and Thickness

Published: 2026-10-30 | Author: HuanCheer Editorial

Honeycomb paper cushioning is specified badly more often than any other paper-based protection, because the three variables that matter, cell size, paper grade and pad thickness, are usually quoted as a single thickness. A 20 mm pad made from 120 gsm paper in 10 mm cells and a 20 mm pad made from 90 gsm paper in 16 mm cells look identical on a spec sheet and behave differently by a factor of two on a drop test.

What the Honeycomb Does

The honeycomb core is a vertical cell structure bonded between two liners. Under a vertical load the cell walls buckle progressively, which is what gives the material its cushion curve: a plateau where it absorbs energy at nearly constant stress, followed by densification where it stops absorbing and starts transmitting.

The plateau is the useful region. A pad is correctly specified when the product's weight produces a static stress inside the plateau, not above it and not far below it. Below the plateau, the pad is too stiff and transmits the shock; above it, the pad bottoms out and the product takes the full drop.

Cell Size

Cell size, measured across the flat-to-flat distance, controls the plateau stress. Small cells of 8 to 10 mm buckle at higher stress; large cells of 16 to 20 mm buckle at lower stress. For the same paper grade, moving from 10 mm to 16 mm cells lowers the plateau stress by roughly 35 percent.

Practical mapping: 8 to 10 mm cells for products of 5 to 15 kilograms, 12 to 14 mm for 2 to 5 kilograms, 16 to 20 mm for 0.5 to 2 kilograms. Heavier products need the higher stress of small cells to stay off the bottom of the pad.

Paper Grade

Cell wall paper runs 90 to 140 gsm in most cushioning, with 120 gsm the common default. Wall thickness follows directly: 90 gsm gives about 0.13 mm, 120 gsm about 0.17 mm, 140 gsm about 0.20 mm. Thicker walls raise plateau stress and slow the buckling, which improves performance in humid conditions.

The trade is cost and weight. Moving from 90 to 120 gsm raises material cost about 25 percent and raises plateau stress about 30 percent, so it is usually cheaper than doubling the pad thickness, which doubles both cost and shipping volume.

Pad Thickness

Thickness sets the stroke available before densification. A common rule is that the pad should be able to compress 60 to 70 percent of its thickness without densifying, so a 30 mm pad has 18 to 21 mm of working stroke.

Required stroke comes from the drop height and the product's fragility. For a 0.8 metre drop and a product that tolerates 40 g, the required stopping distance is roughly 25 to 35 mm, which means a 40 mm pad. A 20 mm pad in the same box will bottom out and the product will see 90 g or more, and the drop test will show a failure that looks like a product defect.

The Selection Table

Product weight	Cell size	Paper grade	Pad thickness at 0.8 m drop
0.5-2 kg	16-20 mm	90-110 gsm	30-40 mm
2-5 kg	12-14 mm	110-120 gsm	35-45 mm
5-15 kg	8-10 mm	120-140 gsm	40-55 mm
15-30 kg	8 mm	140 gsm, double wall	50-65 mm

These are starting points for a single drop at 0.8 metres onto a rigid floor. Multi-drop sequences, corner drops and cold chain all push the numbers up by 10 to 25 percent.

Orientation Matters More Than People Expect

The cells must be loaded in their axis. A pad cut with the cell axis horizontal, which is easy to do when cutting from a block, has almost no cushioning in the vertical direction: it behaves as a stack of paper tubes loaded sideways and collapses at 20 to 30 percent of the axial strength.

Print an arrow on the pad indicating the cell axis, and check the first production batch by cutting one pad open. This single error accounts for a large share of failed drop tests on honeycomb, and it is invisible from outside.

When Honeycomb Is the Wrong Choice

Honeycomb is excellent for medium and heavy products with flat or simple geometry, and poor for products with fragile protrusions, because the pad cannot conform. It is also poor in repeated shock, because the cells do not recover; a pad that has taken one hard drop has lost 30 to 50 percent of its cushioning and cannot be reused.

For a product that will be dropped repeatedly, or for a shape that needs to be wrapped, a molded pulp shell or a paper void-fill system conforms better. Choosing honeycomb for a product with an antenna or a knob is a specification error that no thickness increase will fix.

The Test Before the Order

Build 5 boxes at the specified configuration and drop each once on a face, an edge and a corner from the design height. Instrument one with an accelerometer if possible; if not, inspect the pad for densification, meaning a compressed band above 30 percent of its thickness, and inspect the product for damage.

A configuration that survives with pads compressed 30 to 45 percent is well matched. Pads compressed 10 percent are oversized and wasting money; pads compressed 60 percent or cracked through are undersized, and the next heavier product variant will fail.