Samples fail on compliance for one preventable reason: the factory was never briefed on the compliance target. A supplier asked only for a working sample will select materials for cost and availability, with restricted-substance limits and European conformity duties nowhere in the decision. The fourth briefing in this series fixes that gap. It shows how to state substance requirements in testable form, how to divide CE marking work between buyer and factory, and which approval gates to set before the first sample is built.
Key takeaways
- Brief restricted-substance requirements as testable limits with named thresholds and report expectations, not as a general request to be compliant.
- Divide CE marking duties explicitly between buyer and factory, starting from an agreed list of applicable directives for the product.
- The RoHS framework restricts specified hazardous substances in electrical and electronic equipment and shapes what evidence buyers should demand. [1]
- CE marking indicates that a product has been assessed against applicable European requirements, which is why the briefing must settle the applicable list early. [2]
- Define approval gates in the briefing so sample verdicts trigger pre-agreed production consequences instead of fresh negotiations.
This is the fourth instalment in a series on briefing factories before sample evaluation, and it covers the two compliance subjects that buyers most often leave vague: restricted substances and CE marking responsibilities. Earlier parts dealt with drawings, tolerances, and functional testing. This part deals with the legal and market-access layer that sits above the physical sample, and that can block a shipment even when the sample looks perfect.
Factories cannot demonstrate compliance they were never asked to demonstrate. A supplier told only to make a sample that works will optimise for function and appearance, choosing materials and components for availability and cost. Restricted-substance limits and CE marking duties never enter that optimisation unless the buyer puts them there. The briefing is the instrument that puts them there, in language the factory can act on.
What follows is a practical briefing template for the compliance layer: how to state substance requirements so they can be tested, how to divide CE marking duties so nothing falls between buyer and factory, and which approval gates to define before the first sample ships. The substance discussion draws on the RoHS framework that restricts hazardous materials in electrical and electronic equipment, and the marking discussion draws on the CE system that signals conformity with applicable European requirements.
Why compliance belongs in the briefing, not the purchase order
Purchase orders describe commercial terms: quantities, prices, dates. They are poor vehicles for technical requirements because factory planners read them for scheduling, not for engineering. A restricted-substance clause buried in order fine print will be seen by the sales contact and never reach the engineer choosing plastics or finishes. The briefing exists to carry engineering requirements through a separate channel to the people who decide materials and processes.
Timing compounds the problem. Material choices happen early, often before the order is even placed, when the factory sources resins, metals, coatings, and bought-in components for the sample build. A substance requirement that arrives after those choices can only be satisfied by rebuilding the sample, which costs time and goodwill. Briefing first and ordering second keeps the sequence honest: requirements precede choices, choices precede samples, and samples demonstrate the requirements.
There is also a division-of-labour problem. In many private-label arrangements the buyer owns the brand and the market access, while the factory owns the build. Each side assumes the other handles conformity. The briefing forces the conversation that dissolves the assumption, assigning each conformity task to a named party with a named deliverable and date.
Briefing restricted substances so factories can act
A workable substance briefing has four elements. First, the scope: which products, materials, and components the limits apply to, including packaging where relevant. Second, the limits themselves: the named substances and thresholds, stated numerically rather than by reference to a remembered standard version. Third, the evidence: what the factory must deliver with the sample, such as laboratory reports on homogeneous materials or structured declarations with report references. Fourth, the change rule: what happens when a material or sub-supplier changes after approval, and what re-testing that triggers.
The RoHS framework illustrates why precision matters. It restricts specified hazardous substances in electrical and electronic equipment above defined thresholds, and compliance is demonstrated per homogeneous material rather than per finished product. [1] A briefing that merely says the product must be RoHS compliant gives the factory no testable plan. A briefing that lists the substances, the thresholds, the material scope, and the report format gives the engineer a checklist and the inspector a verdict scale.
Finish the substance section with a practical demand: ask the factory to map every material in the sample to its evidence before shipping. The mapping table need not be elaborate, but it must be complete, because gaps in the map are where non-compliant materials hide. Many buyers schedule an independent pre-production sample check independent pre-production sample check to review this mapping alongside the physical sample, since a neutral review of substance evidence often catches mismatches between declared materials and tested ones before tooling multiplies the problem.
What the compliance section of a briefing must contain
| Briefing element | What good looks like | Common failure when it is missing |
|---|---|---|
| Substance scope | Named products, materials, components, and packaging covered | Factory tests the housing and forgets cables, coatings, and packing |
| Limits and thresholds | Substances with numeric limits and the standard version cited | Both sides argue later about which version applied |
| Evidence format | Lab reports per material plus declaration referencing them | A one-line declaration with no test data behind it |
| CE directive list | Agreed applicable directives with reasons recorded | Sample engineered toward the wrong conformity route |
| Duty division | Each conformity task assigned to buyer or factory with dates | Both sides assume the other handles documentation |
| Change control | Re-testing rules for material or sub-supplier changes | Approved sample and mass production silently diverge |
Read this table as the minimum contents of the compliance section in your briefing pack: each row is a question the factory should be able to answer without asking you back.
Dividing CE marking duties without gaps
- Agree the applicable directives firstList the directives you consider applicable from the product's nature and function, and invite the factory to confirm or contest each one with technical reasons before the sample is built.
- Treat the marking as a verdict, not a labelCE marking attests that the product has been assessed against the applicable European requirements, so the briefing should treat the marking as the endpoint of a documented assessment, not a label to be printed. [2]
- Assign every conformity task to one ownerState who produces the technical documentation, who performs or commissions the testing, who signs the declaration, and who retains the file, with one owner per task.
- Demand evidence with the sampleRequire the sample to arrive with draft evidence proportionate to its maturity: identified standards, preliminary test data, and a documentation plan for the remainder.
- Link verdicts to production gatesWrite the consequence of each verdict into the briefing so approval, conditional approval, and rejection each trigger known next steps.
Close the briefing with a single confirmation page that the factory signs and returns: the substance limits acknowledged, the directive list agreed, the duty division accepted, and the evidence format understood. That page is worth more than ten pages of general terms, because it proves the requirements reached the people who build the sample. Keep it with the approved sample record, and every later discussion about compliance starts from a signed baseline instead of competing recollections.
Sources
- Wikipedia: Restriction of Hazardous Substances Directive —— Overview of the RoHS directive restricting hazardous substances in electrical and electronic equipment.
- Wikipedia: CE marking —— Overview of CE marking as conformity marking for products sold in the European Economic Area.
Frequently asked questions
What should I ask a factory to prove RoHS compliance before sample evaluation?
Put it in writing and ask for the current version. A valid RoHS test report names the tested homogeneous materials, the methods used, and the laboratory, and it is dated within the validity window your compliance team accepts. Declarations without test data are useful as commitments but weak as evidence. When a briefing pack references RoHS, attach the exact list of restricted substances and thresholds so the factory tests against the current requirement rather than a remembered one.
How do I know which CE marking directives apply to my product?
Start from the product, not the paperwork. Identify the applicable directives from what the product is and does: electrical safety, electromagnetic compatibility, radio equipment, machinery, and similar product-specific rules each carry their own conformity route. Your briefing should state which directives you consider applicable and ask the factory to confirm or challenge that list with reasons. Reaching agreement on this list before samples are built prevents the painful discovery that the sample was engineered toward the wrong conformity path.
Why brief the factory before tooling instead of with the purchase order?
Because production tooling has momentum. Once moulds are cut, fixtures are built, and material is purchased, every design correction becomes expensive and slow. A briefing that arrives with the purchase order corrects nothing; it merely documents what should have happened. The briefing belongs upstream of tooling, when changes still cost hours rather than weeks.
What approval gates should the briefing define?
Separate the sample into graded verdicts. Full approval releases production. Conditional approval releases preparation but not mass output, with named conditions and a second sample round. Rejection stops the line and restates the criteria that failed. Writing these gates into the briefing means nobody negotiates the meaning of a verdict after the results arrive.