None of these regulations restrict PVC. They restrict substances, some of which can be present in a PVC compound.

A buyer asks for a restricted substances declaration. A supplier sends one. The document arrives with three or four regulation names on it, and both parties move on.

The reason this deserves more attention is that the three names most commonly printed on those documents restrict different things, apply to different products, and are updated on different schedules. A single sheet listing all of them is a summary of several different answers, and summaries lose exactly the detail that makes the answers usable.

The substances involved are the ones present in a compound rather than in the polymer, which is the subject of our guide to what is actually in a PVC sheet. Everything below concerns those additives rather than the PVC itself.

This distinction sounds pedantic and is not. It determines which regulation applies to a given product and which one is being quoted because somebody asked for it.

Restricted substances legislation regulates chemicals. It produces lists of substances that may not be present above a threshold, or may not be used in particular applications. PVC is not on any of those lists and never has been. What the lists contain are specific plasticisers, specific stabilisers, specific pigments, and specific heavy metals that may be present in the additives used to make a usable compound.

The polymer is the same across the range. The compliance position is set by what is added to it.

The practical consequence is that a generic statement that a material is compliant with a regulation is incomplete in the same way that a flammability rating without a thickness is incomplete. It has named a rule without naming the object the rule was applied to.

Most documents called declarations of conformity are statements, not test results, and the difference matters when something goes wrong.

A typical declaration reads that the supplier confirms, to the best of their knowledge, that the product does not contain listed substances above the applicable threshold. What sits behind that sentence is information collected from the supplier's own raw material vendors, assembled and passed along. In the great majority of cases no testing was performed on the finished board.

The practical weakness of the declaration route is that it depends on a chain. The board maker relies on the compound supplier, who relies on the additive suppliers, who rely on their own raw material sources. Every link is a place where a substance could be introduced without anyone upstream being told. This is the same supply chain visibility problem that makes recycled content claims difficult to verify, which is covered in our guide to recycled content in PVC sheet.

None of that makes declarations worthless. It makes them a statement about a process rather than a statement about a product, and it explains why a supplier who manufactures their own compound can make a stronger declaration than one who buys compound and extrudes it.

The candidate list of substances of very high concern is not a fixed document. It is updated periodically as substances are assessed and added, and the list has grown substantially since it was first published.

This has a consequence that catches buyers out repeatedly. A declaration issued three years ago was assessed against the list as it stood three years ago. Substances added since then were not considered, not because anyone was careless, but because they had not yet been identified.

There is a second timing issue that affects European buyers specifically. Articles containing a candidate list substance above a concentration threshold carry a duty to communicate that information down the supply chain, and separately there is an obligation to notify certain articles to a central database. Both duties attach to the article as placed on the market, which means the assessment has to be current at the time of each shipment rather than at the time of the original order.

The concentration threshold is worth understanding because it is often assumed to be much smaller than it is. It sits at one tenth of one percent by weight, and it applies at the level of the article rather than the whole shipment. That is a meaningful allowance, and it is the reason many declarations are given without qualification. It is also the reason a declaration should state the basis on which the threshold was applied, because on a complex assembly the answer depends on how the article is defined.

A declaration is a statement about a formulation at a point in time. The list it was measured against determines what that statement covers.

RoHS restricts ten substances. Most of them are directly relevant to PVC. The regulation itself, however, applies to a product category that a building material does not belong to.

This matters most where a PVC component forms part of a larger electrical product. In that case RoHS genuinely applies, and the substance list becomes a real requirement rather than a formality. Where the PVC is a wall panel, a ceiling plank or a fence profile sold as a building material, it does not.

Proposition 65 has a similar characteristic from the other direction. It is often described as a compliance requirement when it is in fact a warning requirement. A product containing a listed substance above the safe harbour level is not prohibited from sale; the seller is required to warn. Where a project specifies Prop 65 compliance, it is worth establishing whether the intent is a warning, a threshold, or something else, because the regulation itself only delivers the first of those.

The compliance position of a PVC compound is determined by four things, and all four are choices made at formulation stage.

The per- and polyfluoroalkyl substance question sits differently again, because it is not a known PVC problem in the way that phthalates are. The difficulty is definitional. The class is broad, the boundaries are still being settled in different jurisdictions, and answering the question honestly requires knowing whether any fluorinated substance appears anywhere in the additive chain. For most manufacturers that is a supply chain investigation rather than a formulation fact.

Where a project asks for a per- and polyfluoroalkyl substance statement, it is worth asking what definition is being used. Answers given against different definitions are not comparable, and a supplier who responds that their product contains none may be answering a narrower question than the one being asked.

Where testing is used, the choice of method determines what question gets answered. Two of the common approaches are frequently confused.

There is a second limitation that applies to every test method equally. A test report covers the substances it was instructed to look for. It is an answer to a defined question, not a general clearance. A report listing a handful of specific compounds tells you those compounds were not detected above the reporting limit in that sample, and nothing beyond that.

The method and the substance list are chosen together. A result is only as broad as the set of compounds the laboratory was asked to find.

Sample representativeness is the third variable. A test report describes the sample submitted, and whether that sample reflects the material actually shipped depends on how it was drawn. Where compliance evidence is being relied on over multiple shipments, that question is worth raising with the supplier directly, and the wider framework for evaluating a manufacturer's claims is set out in our guide to verifying board manufacturer capability.

A declaration that can be defended when it is challenged contains six things, and most of them cost nothing to add.

The sixth item is the one worth pressing for. Where an application involves food contact, medical use, electrical equipment or a regulated construction product, the restricted substances declaration is one input among several rather than the whole compliance position. What a food contact approval actually covers, and why it is a different question from this one, is set out in our guide to medical and antibacterial board compliance and in the wider certification overview in our piece on PVC building material certifications.

For importers managing this across a product range, the practical approach is to ask for the same six items every time and keep them on file with their dates. A folder of dated declarations is a manageable compliance position. A folder of undated statements saying compliant is a set of documents that cannot be shown to cover anything in particular.