EN 71-3 is the European standard for the migration of certain elements from toy materials, and it is applied to childrenswear zippers far more often than its formal scope would suggest. The reason is practical: a child mouths a zipper pull, a slider sits against the skin, and a brand needs a defensible way to show that the metal and the coating do not release harmful elements. EN 71-3 provides a recognised method and a set of limits, so it becomes the contractual benchmark even where it is not a legal requirement.

This article explains what the standard tests, why the material category matters more than the total content, how the extraction works, and where zipper components most often fail.

1. Scope: toys, and by extension childrenswear

The standard is part of the harmonised standards supporting the European toy safety framework, and its formal scope is toy materials and parts of toys that are accessible to children. A zipper on a jacket is not a toy, so applying EN 71-3 to it is a voluntary act, usually driven by a brand's own policy, a retailer's technical requirement or a customer's restricted substances list.

That distinction has two consequences. First, the buyer must write the requirement into the specification, because no regulator will enforce it on a garment. Second, the buyer must define how the standard is applied: which part of the zipper is tested, at which material category, and against which edition.

The standard covers the migration of a defined list of elements rather than their total content. The list includes the heavy metals that are traditionally associated with pigments, stabilisers, plating and alloys, and it treats each element separately with its own limit. The limits are not a single number; they depend on the material category.

2. Key requirements: categories and what they mean

The standard sorts materials into categories according to how they are likely to be ingested or contacted. In broad terms the categories run from dry, brittle, powder-like or pliable materials, through liquid or sticky materials, to materials that are scraped off. Each category has its own limit for each element, and the limits are generally stricter for materials that are more likely to be swallowed.

For a zipper, the mapping is the practical work:

  • Metal components such as the chain, slider and puller are solid materials and are assessed as scraped-off material, because a child can abrade them.
  • Coated tape is assessed as a solid material, with the coating treated as the surface that is exposed.
  • Painted or printed areas, including printed logos on tape, are assessed as coatings and may fall into a different category if they can be scraped.
  • Soft plastic pullers and moulded parts are assessed according to their physical form, not their chemistry.

The category drives the limit, so a report that does not state the category for each material cannot be checked against the standard. This is the single most common documentary failure.

3. Test methods

The test simulates what happens in the digestive system rather than what happens in the environment. The sample is extracted in a dilute acid solution at body temperature, for the extraction time specified for the material category, and the extract is then analysed for each element.

  1. Separate the article into homogeneous materials. A zipper is not one material: the metal, the tape, the coating and any print are separate test portions.
  2. Determine the material category for each portion, and apply the corresponding limits.
  3. Prepare the test portion in the form and particle size specified for its category.
  4. Extract under the specified conditions of acid concentration, temperature and time.
  5. Analyse the extract by inductively coupled plasma optical emission or mass spectrometry, and report each element in milligrams per kilogram of material.
  6. Compare each result with the limit for that category and that element.

Chromium VI is treated with particular care, because it is a separate oxidation state with its own limit and its own analytical requirements, and a total chromium result cannot be used as a substitute. Lead, cadmium and mercury are the elements most often discussed, but the list is longer and a report should cover all of it.

4. Common non-conformities

  • Testing the zipper as a single article rather than separating it into homogeneous materials, which dilutes a failing metal result with passing tape and hides the problem.
  • A report that gives total content instead of migration, which is a different test with a different meaning.
  • Wrong or unstated material category, so the result is compared with the wrong limit.
  • Lead in die-cast zinc sliders made from uncontrolled scrap, or in a low-cost plating.
  • Cadmium in a pigment or a stabiliser in a coloured plastic component.
  • Chromium VI present in a passivation layer, reported as total chromium or not tested at all.
  • A test on a new sample that ignores wear, even though the standard's logic is about what a child can access after use.
  • An older edition cited, with limits that have since changed.

5. Practical sourcing advice

Write the requirement as a test instruction, not as a claim. Name the standard and edition, state that each homogeneous material is to be tested separately, and require the category to be reported for each portion. That single instruction prevents the dilution problem.

Ask the supplier for a material breakdown with the quotation: alloy type for slider and puller, plating and passivation type, tape composition and coating, and the composition of any print. With that breakdown the laboratory can plan the test portions properly, and the buyer can see where the risk sits.

Design out the known failures. Specify lead-free alloy, avoid cadmium pigments, use trivalent chromium passivation or a non-chromium finish, and avoid decorative prints on tape where they are not needed. These choices cost little and remove the most common failure modes.

Remember what the standard does not cover. EN 71-3 does not address nickel release, which is a separate restriction and needs its own test, and it does not address phthalates. A childrenswear zipper specification usually needs all three, and each one is a separate line in the test plan. Where a limit or a category is unclear, refer to the standard text and the laboratory's accreditation scope rather than to a previous report.