Quick answer: No instruments are needed to judge a multi-purpose outdoor case on site. Measure the internal diagonals, trap a 0.1 mm paper strip at the gasket, then load 32 kg.
Table of contents
- Measure three dimensions first on a multi-purpose outdoor case
- Latches and gasket: what one paper strip reveals
- Load and handle: deflection after 32 kg
- Material and weather: UV, cold and salt fog trade-offs
- FAQ
1. Measure three dimensions first on a multi-purpose outdoor case
Two samples stood side by side at 210 and 320 yuan, differing only in latch count and one rib. Open both lids, align the rims, run a tape: the dearer one showed 1.5 mm between diagonals, the cheaper 5 mm.
Three measurements decide most of it: diagonals, rim flange and side wall.
| Field check | How to measure | Pass line | Failure |
|---|---|---|---|
| Diagonals | Tape both, take the gap | ≤3 mm apart | Body skewed, lid touches one side |
| Rim flange | Caliper at the narrowest point | ≥12 mm | A 6 mm flange rolls |
| Side wall | Caliper at three points | 3.2 mm ±0.2 mm | 2.4 mm yields to thumb |
| Depth | Steel rule, rim to base | ≥95% of nominal | Marked 210 mm, measures 186 mm |
Depth is the quietest shortfall. A multi-purpose outdoor case marked 210 mm loses 12 mm to base ribs, and a 20 mm liner takes the rest, leaving 178 mm.
Diagonal spread governs stacking too. Beyond 3 mm, a 5-high stack loads the corners unevenly and the bottom lid takes a white mark.
2. Latches and gasket: what one paper strip reveals
A gasket can be checked in the aisle. Tear a 0.1 mm paper strip, trap it between rim and gasket, close the latch, then pull: four corners that grip mean correct compression; a corner that releases is the leak path.
The strip replaces a leak tester outdoors. On a sound multi-purpose outdoor case the gasket sits at 25%–30% compression and the strip needs about 2 kg to pull free. Past 35%, it feels tight for 3 months and then sets.
Check the latches twice. A stainless bail springs back after 5000 closures; a zinc-plated one shows white rust after 96 hours of salt spray. Opening force belongs at 25–35 N.
Hinges come third. Past 0.3 mm of pin clearance the lid rocks sideways, shearing the gasket until it splits within a year. Open to 90 degrees, let it fall, and listen for a metallic click.
3. Load and handle: deflection after 32 kg
Skip the rating and test it. Fill a multi-purpose outdoor case with 32 kg of sand, latch it, lift by the handle for 10 minutes, then measure base deflection: under 1.8 mm passes, past 3 mm the ribs are too shallow.
Handles are sized at three times the working load, so 32 kg needs 96 kg static without cracking. Failures start at the root, where 2.5 mm of wall and two screws do the work.
Wheels decide how it travels. Four 50 mm wheels dragged 1 km on gravel reach 60℃ at the axle; nylon outlasts rubber but runs 8 dB louder.
4. Material and weather: UV, cold and salt fog trade-offs
Material never shows at a display table, so ask three questions on a multi-purpose outdoor case: grade, UV hours, cold drop result. Copolymer PP holds toughness at -30℃ while homopolymer goes brittle, a 6 yuan swing that decides a winter.
UV is the forgotten item. After 1000 hours, a shift above ΔE 3 reads chalky and impact strength drops 20%; 2% carbon black pulls it to 1.5 for 0.8 yuan.
| Duty | Key figure | Verify | Compromise |
|---|---|---|---|
| Plateau, cold | Drop 1.5 m at -30℃ | Cold impact report | 3.6 mm wall, 0.4 kg heavier |
| Coastal deck | 96 h salt spray | White rust on latches | Full stainless, 9 yuan more |
| Outdoors | UV 1000 h, ΔE ≤3 | Compare an older unit | Carbon black, 0.8 yuan more |
| Humid store | IP67, 1 m for 30 minutes | Strip plus immersion | Silicone gasket, 4 yuan more |
Coastal duty on a multi-purpose outdoor case needs its own figure: 96 hours is an entry line, and a boat deck deserves 240, because the plated catch always rusts first.
Conclusion
Judging a multi-purpose outdoor case comes down to four moves: measure diagonals, pull the paper strip, lift 32 kg, ask for ageing data. Do those and the 110 yuan gap explains itself, which is the point of testing any multi-purpose outdoor case.
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.
Related Reading
- How a multi-purpose outdoor case is moulded
- Camp and vehicle configurations
- Criteria for tactical plastic storage boxes
- Gasket and pressure balance in airtight cases
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