Why is foam density fixed at 45 kg/m³?

Answer: Below 45, rebound after a 1.2 m six-face drop misses ≥92% and the liner loosens; above 45, hard foam carries impact to a shell corner. The outdoor diving flashlight shockproof safety box takes 45 as the balance.

Why a 0.5 mm frame gap?

Answer: A wider gap lets shift pass ≤0.7 mm on a drop, a tighter one ages rebound early. The 0.5 mm is set tight for 3600 cycles of wear, pre-loading the foam a little before the frame stops.

How is ≥92% rebound after six faces read?

Answer: Six 1.2 m drops in sequence, each followed by a recovered-height reading and a liner-shift log. The sixth face at ≥92% and ≤0.7 mm passes; an early crossing ends the run.

What does the 0.5 m, 1 h immersion retest judge?

Answer: Whether mouth seal and frame let hydrostatic pressure loosen the liner. The mouth is checked for water, the 18% groove dried, and shift still held within ≤0.7 mm.

Outdoor diving flashlight shockproof safety box

Quick answer: An outdoor diving flashlight shockproof safety box keeps foam rebound above 92% after a 1.2 m six-face drop, with liner shift under 0.7 mm.

Foam density in the outdoor diving flashlight shockproof safety box
Reserved clearance of the lid press frame
Rebound readings across successive drops
Liner shift on the immersion retest
Density reject line for diving batches
FAQ

1. Foam density in the outdoor diving flashlight shockproof safety box

The shell of this outdoor diving flashlight shockproof safety box measures 420×310×160 mm outside, 365×255×110 mm inside, with a 3.2 mm wall, and the base foam is held at 45 kg/m³. Denser foam is not automatically better: a higher grade rebounds faster and leaves less set after a six-face drop, but hard foam passes impact straight to the shell and dents the liner contact face. The 45 kg/m³ grade is the measured balance between rebound and cushioning.

Too low a grade and permanent compression grows after a 1.2 m six-face drop, rebound misses ≥92% and the liner starts to loosen in the base; too high and the impact peak travels along hard foam to a shell corner. Both failures trace to density, not the latches. At 2.9 kg empty and 5.5 kg loaded, cushioning returns to this grade rather than to a thicker pad.

Density grade	Rebound after six-face drop	Verdict
35 kg/m³	88%	Reject
45 kg/m³	≥92%	Threshold
55 kg/m³	94%, too hard	Reject

2. Reserved clearance of the lid press frame

A 0.5 mm gap between the lid press frame and the base foam closes the lid without crushing the pad or letting the liner float. In the outdoor diving flashlight shockproof safety box the frame is moulded into the lid and descends to pre-load the foam a little, then stops; a wider gap lets liner shift pass ≤0.7 mm on a 1.2 m drop, while a tighter one keeps foam compressed and ages rebound early.

Outdoor diving flashlight shockproof safety box black open shell on grey studio backdrop, rectangular reliefs in lid foam, long empty foam slots in base

The gap carries allowance for wear over 3600 open-close cycles: as the frame edge wears the gap grows, so the initial 0.5 mm is set tight rather than loose. Corner stops line up with relief slots in the base foam, and two latches at 300 N each seat without lid spring-back. This detail is independent of foam density, yet the two together decide the liner rebound of the outdoor diving flashlight shockproof safety box after repeated drops.

3. Rebound readings across successive drops

Drops run 1.2 m across six faces in sequence, with rebound logged after every face rather than only the sixth. The outdoor diving flashlight shockproof safety box rests briefly after each impact, a thickness gauge reads the recovered foam height against the start, and liner shift from a base datum is logged too. After six faces, rebound must hold ≥92% and shift stay within ≤0.7 mm; an early crossing ends the run.

Drop sequence	Foam rebound	Liner shift
1st face	98%	0.1 mm
3rd face	95%	0.4 mm
6th face	≥92%	≤0.7 mm

The sixth-face row at ≥92% and ≤0.7 mm is the line. Rebound read as density fade plus a widening frame gap beats watching thickness alone. A spread above 2 points across three cases means uneven foam density, so the batch is checked before the criterion. Drop order, specimen attitude and floor flatness all go into the record, or the six readings have no comparison.

4. Liner shift on the immersion retest

Liner shift is remeasured after a 0.5 m immersion for 1 h, a seal-and-liner retest beyond the drops. The outdoor diving flashlight shockproof safety box has already taken six impacts, and immersion checks whether the mouth seal edge and the frame let hydrostatic pressure nudge the liner loose; the box is opened, the mouth checked for water, then shift measured again, still held within ≤0.7 mm.

Outdoor diving flashlight shockproof safety box injection bay enclosed by yellow steel railings, kraft sacks stacked at right, blue columns, green epoxy floor

The single gasket groove at 18% compression is dried before reading, since trapped water inflates the figure; if the two 300 N latches show give first, the fault is latch preload, not the liner. Re-measured after immersion, a frame gap widened by moisture lets shift accumulate along it, and IP67 is written as a benchmark method only. Read together, these confirm the base foam of the outdoor diving flashlight shockproof safety box still holds the liner in place after drop and immersion.

5. Density reject line for diving batches

The reject line lands on the measured lower deviation of 45 kg/m³ foam and the rebound after six faces. Every outdoor diving flashlight shockproof safety box batch is sampled for density, then drop rebound backs out foam fatigue; both must clear before sign-off. Density is listed apart because it sets the initial cushion and decides the rebound margin left after six faces, exposing incoming drift earlier than an end reading.

Rebound reading	Matching density	Batch verdict
90%	40 kg/m³	Reject
92%	45 kg/m³	Threshold
94%	55 kg/m³	Too hard

The 90% row paired with 40 kg/m³ misses ≥92% and is rejected; 94% with 55 kg/m³ rebounds well but hard foam passes impact to the shell, so it is not taken. JUNZHIJIA centres shock batches on 45 kg/m³ and ≥92% rebound, with density, initial thickness and six-face end rebound on one line; a batch missing one figure leaves the pass count.

Conclusion

The shock verdict for the outdoor diving flashlight shockproof safety box is whether base foam density and frame gap still hold the liner in place after repeated drops. 45 kg/m³, a 0.5 mm gap, ≥92% rebound over six 1.2 m faces and ≤0.7 mm liner shift must be read on one batch; separating any one destroys comparison. Measure density and initial thickness first, run six-face readings, then the immersion retest, because reversing it scores frame give as rebound fade.