What must a Communication Equipment Case acceptance include at minimum?

Answer: Appearance, dimensions, air tightness and structural parts; without air testing no ingress claim is proven.

How is the air test limit set?

Answer: 20 kPa for 60 seconds, dropping no more than 0.6 kPa; tighter reads thermal drift as a leak.

Can appearance defects simply be banned?

Answer: No. Weld lines cannot be removed from dark shells, so limit position, length and lighting instead.

Must a 30-piece custom run follow the 80-piece table?

Answer: No. A fixed 20 suits a 30 to 50 piece run when the substitution is written into the document.

The first article passed but the batch failed. Who is responsible?

Answer: Check patrol records first. Walls thin by 0.2 mm once mould temperature stabilises, so missing patrol points to process control.

Communication Equipment Case Acceptance: Tests and Judgement

Quick answer: Acceptance for a Communication Equipment Case must convert a vague requirement into three things: check items, judgement values and sampling rules. Give every value a number and a measuring condition, and split sampling by batch size and defect class.

The Four Gates of a Communication Equipment Case Acceptance
Appearance and Structural Checks
How Dimensions and Fit Are Judged
Ingress and Air-Tightness Testing
Batch Sampling and Disposition
FAQ

1. The Four Gates of a Communication Equipment Case Acceptance

Acceptance of a Communication Equipment Case runs through four gates: incoming material, first article, patrol and release. Incoming checks resin grade and regrind, first article checks mould and process window, patrol watches drift, release checks consistency. Pool them into one sheet and a passed first article becomes a scrapped batch.

Keep three first-article samples: one cut for walls and inserts, one for the air test, one as reference, since colour, texture and flash cannot be argued from words.

Gate	Timing	Checks	If it fails
Incoming	Each resin lot	Grade, melt index, regrind	Reject lot
First article	After setup	Wall, inserts, air test	Stop, redo
Patrol	Every 2 hours	Appearance, gap, weight	Quarantine shift

Patrol is skipped most often: mould temperature needs 40 minutes to stabilise, and walls then run 0.2 mm thinner than the first article.

2. Appearance and Structural Checks

The hard part is the line between a defect and a process signature. Weld lines cannot be removed from dark shells, so limit them: never across the sealing face, never over 30 mm.

Communication Equipment Case: rows of steel moulds standing in the shop, ML8-6215 and GY-604 codes on the blocks, a red gantry beam above

Structural parts are worked, not looked at: latch and listen, hang the lid by the hinge, pull the handle to 800 N, torque inserts to 8 N·m.

Check	Value	Method	Class
Colour shift	Delta E 1.5 max	Spectrophotometer, D65	Major
Flash	0.5 mm, zero on seal face	Feeler gauge	Major
Handle pull	800 N, 1 minute	Load cell	Critical

3. How Dimensions and Fit Are Judged

Separate out-of-tolerance from out-of-tolerance but usable. A cavity 0.8 mm small keeps the equipment out, which is fatal; an envelope 1.5 mm large only disturbs pallet layout, which is a concession. The scheme has three levels: critical at Ac=0, so one failure holds the batch; major at AQL 2.5; minor at AQL 4.0. At a sample of 20 that is Ac=1, Re=2 and Ac=2, Re=3.

Judge fit in the working state. Close every latch before measuring the lid gap, since a loose lid reads 0.3 to 0.5 mm wide; measure flatness unloaded, one gap under 1.5 mm.

4. Ingress and Air-Tightness Testing

The order cannot be shuffled: air, then spray, then immersion. Air screens fast, spray proves the gasket route, immersion proves the shell. Backwards, water from immersion reads as a shell leak.

Communication Equipment Case: three open red and black cases on a green bench with black foam dividers, a gloved worker, wrapped pallets behind

Air is 20 kPa held 60 seconds, dropping 0.6 kPa at most. Most failures come from swarf in the valve or a poorly bonded gasket joint, not the shell.

Test	Condition	Pass	Sampling
Air	20 kPa, 60 s	Drop 0.6 kPa max	100 percent
Immersion	1 m, 30 min	No water inside	1 per batch
Cold drop	-40 C, 4 h, 1.2 m	Corners intact	2 per batch

Life tests run on schedule, not per batch: at four openings a day, 5000 cycles covers about three and a half years.

5. Batch Sampling and Disposition

Sampling starts with batch size. For 501 to 1200 pieces, level II gives a sample of 80; a Communication Equipment Case run of 30 to 50 is better served by a fixed sample of 20, if the document says so.

Disposition has three routes: rework for appearance and minor dimensions, with the item rechecked; concession for deviation that affects neither assembly nor ingress, with amount and approver recorded; rejection for critical dimensions and failed ingress.

Add a closing clause: two occurrences of one defect in a batch count as loss of process control, suspending supply until corrective action arrives.

Conclusion

An acceptance standard earns its keep through consistency, not severity: fixed check items, values carrying measuring conditions, sampling rules with a written substitution, disposition that leaves a trail. Written that way, every inspector measures a Communication Equipment Case alike.

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.