Can the 32 pockets in 3 zones use different depths?

Answer: They can, but the Industrial hardware protective box with foam normally holds one 28 mm depth and separates zones by width and ribs. Uneven depths stop the lid liner pressing flat and leave gaps that loosen first on the shallow side during a drop.

How is the ≤1.2 mm sag measured after 5000 insertions?

Answer: Measure slot depth once before cycling, then again at the same pocket 30 s after unloading; the difference is sag. Rebound is recovered thickness over original thickness, and the Industrial hardware protective box with foam asks for ≥94% on the same sample batch.

What is rechecked after a 1.0 m drop and IP65 spray?

Answer: Walls are checked for splits and the liner for delamination, then the 28 mm depth and rebound are measured again. Only results inside ≤1.2 mm and ≥94% pass; a clean appearance after spray is not treated as liner approval for the Industrial hardware protective box with foam.

Industrial hardware protective box with foam

Q: Why does the Industrial hardware protective box with foam use 35 kg/m³ foam?

Answer: Below 30 kg/m³ the slot walls sag past 1.2 mm after 5000 cycles, and above 45 kg/m³ the foam is too stiff to release parts easily. 35 kg/m³ is the value where ≥94% rebound and a 28 mm depth both hold.

Quick answer: The Industrial hardware protective box with foam uses 35 kg/m³ foam cut into 32 slots, with ≤1.2 mm sag and ≥94% rebound after 5000 cycles.

Why the Industrial hardware protective box with foam sorts slots by part weight
Slot depth of 28 mm across 32 pockets
Sag and rebound after 5000 insertion cycles
How outer and inner dimensions set the liner
Drop, IP65 and temperature effects on foam
FAQ

1. Why the Industrial hardware protective box with foam sorts slots by part weight

The Industrial hardware protective box with foam does not rely on one hollowed block. The 35 kg/m³ foam is split into 3 zones by part weight, and a light, a medium and a heavy zone each get a different slot width and support rib. A density of 35 kg/m³ balances cycle life against support: go lower and the slot walls slump after 5000 insertions; go higher and the slot mouth turns stiff, which makes removal slow. The zone table is fixed before any cutting, with 32 pockets divided 12, 12 and 8.

Weight zone	Part mass kg	Pocket count	Slot width mm	Support rib
Light	up to 0.4	12	18	single
Medium	0.4 to 1.2	12	26	double
Heavy	above 1.2	8	34	grid

2. Slot depth of 28 mm across 32 pockets

The Industrial hardware protective box with foam takes a single 28 mm slot depth, derived from the 150 mm cavity minus base allowance and lid liner thickness. Deeper is not better: at 28 mm the slot floor keeps 22 mm of parent material, enough to carry the part; 5 mm more thins that floor and pushes sag past 1.2 mm after 5000 cycles.

Industrial hardware protective box with foam open black case with ribbed lid texture, a grey base panel, two red button latches and a grip handle.

The 32 pockets sit on the 505 × 365 mm floor in 4 rows of 8, with a 6 mm rib between neighbours; ribs under 6 mm tend to fray under the cutter. The Industrial hardware protective box with foam places the 8 heavy pockets in the two hinge-side columns, the 12 light pockets along the opening and the remaining 12 in between. Only after the layout is fixed does depth grouping start; within one zone the depth stays constant so the lid liner can press flat.

Slot depth	Zone	Floor left mm	Sag after 5000 mm	Verdict
20 mm	light	30	0.6	pass
24 mm	medium	26	0.9	pass
28 mm	heavy	22	1.2	borderline pass
32 mm	not used	18	1.8	fail

3. Sag and rebound after 5000 insertion cycles

The Industrial hardware protective box with foam is judged after 5000 insertions, not when the foam leaves the cutter. Two criteria apply: slot sag ≤1.2 mm and rebound ≥94%. The first measures permanent set at the slot floor after repeated compression; the second measures how much wall thickness returns within 30 s of unloading. Both must hold at once, and passing one alone is not enough.

Rebound	Cycle count	Sag mm	Slot mouth	Verdict
100%	0	0	tight	baseline
97%	1000	0.5	tight	pass
95%	3000	0.9	slightly loose	pass
94%	5000	1.2	slightly loose	lower limit

4. How outer and inner dimensions set the liner

Between 560 × 420 × 190 mm outside and 505 × 365 × 150 mm inside, the 3.6 mm wall, the rim seal and the lid liner share the difference. The Industrial hardware protective box with foam cuts the liner 2 mm undersize on all four inner edges so that closing the lid never pushes it into the seal; a liner that fouls the rim leaves the lid unlatched and an IP65 spray test meaningless.

Industrial hardware protective box with foam three open cases with tool shaped foam cavities, one cream case with round slots and a numbered grid case.

5. Drop, IP65 and temperature effects on foam

At −10 °C a generic foam drops below 88% rebound, so the formulation is calibrated to both the 55 °C upper and the −10 °C lower bound. The −10 °C to 55 °C working band belongs to the liner as much as to the shell: a foam that stiffens in the cold cannot hold the slot mouth, and one that softens in heat lets a 28 mm slot settle an extra 0.3 mm after a 1.0 m drop.

JUNZHIJIA samples each batch for the dimension chain, sag and rebound after 5000 insertions, and liner appearance after a 1.0 m drop plus IP65 spray. The manufacturer, KeXin New Materials (Guangdong) Co., Ltd., validates against methods only and writes no certificate numbers or test grade codes into the specification. The Industrial hardware protective box with foam is specified as a re-measurable table of density, depth, zones, sag and rebound, so a buyer never has to judge it from the look of a single foam block.

Conclusion

The Industrial hardware protective box with foam reduces its liner to three figures: 35 kg/m³ foam, 32 pockets in 3 weight zones and a 28 mm depth. Two criteria decide acceptance, sag ≤1.2 mm and rebound ≥94% after 5000 insertions, and both must hold at once. Outer 560 × 420 × 190 mm and inner 505 × 365 × 150 mm lock the liner stack, with a 3.6 mm wall, 4.6 kg empty and 12 kg loaded as boundary conditions. A 1.0 m drop, IP65 and −10 °C to 55 °C constrain the material. Keeping material, pocket geometry and criteria on separate lines stops a buyer from being swayed by the look of one foam block.