ISO 4074

What the test does

ISO 4074 is a product specification with its test methods attached — 95 pages of requirements, sampling and the laboratory methods that verify each one. Its scope is precise about a boundary: it covers male condoms made from natural rubber latex, and not any medicinal substance applied to or delivered by the condom.

Three tests carry most of the weight. Freedom from holes is checked by a water leak or electrical method. Package integrity is verified separately, because a sound condom in a failed pack is a failed product. And the airburst test inflates the unit until it bursts, recording both volume and pressure at burst.

Airburst is the characteristic test and its requirements scale with size. For condoms of nominal length 160 mm or more, the minimum bursting volume and pressure by nominal width are 16.0 dm³ at 1.0 kPa for 45.0 to 49.5 mm, 18.0 dm³ at 1.0 kPa for 50.0 to 55.5 mm, 22.0 dm³ at 1.0 kPa for 56.0 to 64.5 mm, and 28.0 dm³ at 0.8 kPa for 65.0 to 75.0 mm.

The standard also carries dimensional requirements — length, width and thickness — along with stability and shelf-life testing, and sampling plans for both continuing production and isolated lots.

What it measures, and why it matters

Pressure and volume together describe what neither says alone. Volume measures how far the rubber stretches before failing; pressure measures how strongly it resists while doing so. A unit can meet the volume requirement and fail on pressure — latex that is extensible but weak, a film that stretches obligingly and then tears.

The width bands are the reason the requirements are tiered rather than fixed. A wider condom encloses more volume at the same wall stress, so holding every size to one volume figure would be lenient on small sizes and punitive on large ones. The largest band drops to 0.8 kPa for the same reason in reverse.

Shelf life is the requirement with the longest reach. Latex oxidises and its properties drift, so a pass at manufacture is not evidence about the same unit two years later in a warm warehouse. The stability programme converts a batch release into a dated claim, and no amount of process control shortcuts it.

For an Indian manufacturer this is a working standard, not an academic one. India is among the world's largest producers, and airburst and leak testing run continuously on the production floor.

Specimen and sampling

A product specification, so the specimen is the article as it will be sold — lubricant, packaging and all.

Article

Finished condoms, sampled from the lotNot a cast latex sheet. The property measured is that of the film as it was actually formed and cured.

Sampling

Defined plans, continuing series and isolated lotsThe plans are part of the requirement, not guidance. A lot judged on a convenient sample has not been judged.

Tensile pieces

Cut from the article itself where requiredWhich is why the tensile work needs grips that hold thin extensible rubber without cutting or slipping.

Test speed

For condoms of nominal length 160 mm or more, the minima step with nominal width. Inflation rate is controlled because latex is rate-sensitive.

45.0 – 49.5 mm width

16.0 dm³ at 1.0 kPa minimumBoth must be met. Volume without pressure means extensible but weak.

50.0 – 55.5 mm width

18.0 dm³ at 1.0 kPa minimumThe most common width band in production.

56.0 – 64.5 mm width

22.0 dm³ at 1.0 kPa minimumA wider article encloses more volume at the same wall stress, which is why the volume minimum rises.

65.0 – 75.0 mm width

28.0 dm³ at 0.8 kPa minimumThe pressure minimum drops in the widest band for the same geometric reason the volume minimum rises.

Inflation rate

ControlledLatex is rate-sensitive: a fast inflation reads high and flatters the result.

How the testing runs

1. 01Draw the sample according to the plan for the lot type — continuing series or isolated.
2. 02Test freedom from holes by the water leak or electrical method.
3. 03Verify package integrity separately from the article itself.
4. 04Measure length, width and thickness, taking thickness under light contact.
5. 05Inflate to burst at a controlled rate, recording both volume and pressure.
6. 06Compare against the minima for that nominal width band.
7. 07Run the stability programme separately to support any shelf-life claim.

What travels with an ISO 4074 result

The width band decides which minima apply, so a burst figure without it cannot be assessed.

• Nominal width and length, since the minima step with width.
• Burst volume and burst pressure, both.
• The leak method used — water or electrical.
• The sampling plan applied and the lot type.
• The shelf-life claim and the stability data supporting it.
• The edition tested to; the 2026 edition replaced the 2015 one.

What the machine must be capable of

The airburst apparatus is the specialised item: a chamber that inflates the condom at a controlled rate while recording volume and pressure to burst, with the resolution to resolve 0.8 kPa meaningfully. Rate control matters, because latex is rate-sensitive and a fast inflation reads high.

Leak testing needs a water-fill arrangement or an electrical conductivity test. Dimensional work needs a way to measure width and length on an article that will not hold a shape, and thickness on a film under light contact — a gauge that presses hard reads latex thinner than it is.

Tensile work on cut pieces runs on a low-force frame with grips that will hold thin, extensible rubber without cutting or slipping.

What goes wrong in practice

Inflating too quickly in airburst is the commonest, and it inflates the result along with the condom.

Thickness measured under too much contact force is the second, and it biases every dimensional result low.

Sampling outside the defined plan is the third. The plans are part of the requirement, not guidance, and a lot judged on a convenient sample has not been judged.

Finally, treating a pass at manufacture as a pass for the shelf life. Only the stability programme supports a dated claim, and it is the requirement most often deferred.

Volume or pressure

The airburst test returns two numbers because either alone can be passed by a bad film.

Both minima must be met. A unit meeting volume and failing pressure is extensible but weak, and that combination is the one a single-figure test would pass.

Questions we are asked about this test

Related and equivalent standards

ISO 23409 covers synthetic condoms, where the material is not natural rubber latex and the requirements differ. WHO and UNFPA publish a prequalification scheme referencing ISO 4074 and adding its own sampling and inspection on top — the framework most public-sector procurement runs on.