Quick answer: Acceptance of a Multi-purpose Outdoor Case rests on four documents and three site actions: drawing, resin batch, unit records and third-party tests, then cavity, wall and deflection, then the repair or return call.
Table of contents
- Which documents a Multi-purpose Outdoor Case must come with
- Measuring on site: cavity, wall and load
- Seals, drops and salt fog: where the lines sit
- Repair, downgrade or return: drawing the border
- FAQ
1. Which documents a Multi-purpose Outdoor Case must come with
A 20-case order arrived. Three were sampled: two walls sat 0.6 mm under nominal, one latch held only 280 N. The supplier produced a certificate of conformity and nothing else, so the argument started.
Four documents close that gap for a Multi-purpose Outdoor Case: the drawing, stating a 560 × 420 × 265 mm cavity and an 8 mm wall at ±0.4 mm; the resin batch report, with melt flow 8 g/10min and density 0.905 g/cm³; a per-unit record carrying the cavity number; and a third-party report for a 1.2 m drop, 240 hours of salt fog and IP67. Without it, three thin walls in 20 cannot be traced to a mould position, so the lot is reworked at 25 minutes per unit.
| Item | Sample | Instrument | Pass line |
|---|---|---|---|
| Cavity | 3 per lot | Tape, three points per axis | ±2 mm |
| Wall | 3 per lot, five points | Ultrasonic gauge | 8 mm, minus 0.5 mm max |
| Seal | 3 per lot | Tank, air pump | 1 m, 30 minutes, dry |
2. Measuring on site: cavity, wall and load
A cavity on a Multi-purpose Outdoor Case is never measured in one place. Take three points per axis, because ±2 mm limits a single reading while a 3 mm spread means mould distortion.
Wall thickness takes five ultrasonic readings per unit, four corners and the centre. A minus deviation past 0.5 mm fails at once; a plus deviation past 0.8 mm sends you to the flow mark, where sink compensation leaves a thin zone beside it.
Load on a Multi-purpose Outdoor Case is judged by deflection: sandbags to 1.25 times the rating, 50 kg, for 24 hours, centre sag within 1.5 mm, residual set under 0.4 mm an hour later, or the base bows in six months.
3. Seals, drops and salt fog: where the lines sit
Immersion is the blunt test for a Multi-purpose Outdoor Case: one metre, 30 minutes, water at 20℃, dry the outside, open. No droplets on the inner wall, in the gasket groove or at the latch seats.
Air pressure is faster: 20 kPa held a minute, a 1 kPa drop passes. A 3 kPa drop points to a corner radius where the gasket thins by 0.5 mm, and soapy water finds the bubble.
Drops of a Multi-purpose Outdoor Case run at 1.2 m over six faces and three rounds after four hours at -25℃: no through crack, latches working over 50 cycles, rim offset within 0.5 mm. Salt fog runs 240 hours, 480 for a coastal site, and white rust above 5% fails. Heat adds four hours at 60℃ with cavity change within 0.5%.
4. Repair, downgrade or return: drawing the border
The three routes belong in the contract.
Repair covers a recoverable function: gasket set over 25%, latch force between 300 and 350 N, liner bond failure. It takes 25 minutes and 18 yuan per unit, then repeats immersion and cycle tests.
Downgrade covers appearance: colour drift, flow lines, print off register past 1 mm, scratches over 20 mm. The unit drops to a non-load-bearing grade at 132 yuan and gets marked.
Return is reserved for four hard faults: a wall 0.5 mm under nominal, a cracked weld line, latch force below 300 N, a leak. Freight is 40 yuan per unit on the supplier, and every unit from that cavity is rechecked.
| Fault | Route | Basis | Cost |
|---|---|---|---|
| Gasket set over 25% | Repair, retest | Compression set | Supplier, 18 yuan |
| Latch force 300–350 N | Repair, new latch | 350 N rating | Supplier, 25 minutes |
| Colour drift | Downgrade | Colour panel | Supplier, 132 yuan |
| Wall 0.5 mm under | Return, lot recheck | 8 mm ±0.4 mm | Supplier, 40 yuan |
Conclusion
Acceptance is less about instruments than about writing the lines down first: four documents, three site actions, a number behind every seal, drop and fog test. Do that and 3 failures in 20 are settled by clause, which is what a Multi-purpose Outdoor Case specification is worth.
This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.
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