ISO/TS 14027 and product category rules explained

ISO/TS 14027 is the ISO document that says how product category rules get written, reviewed, registered and kept up to date. Product category rules, usually shortened to PCR, are the shared rulebook every environmental product declaration in a product category follows.

Often written simply as ISO 14027, the 2017 first edition does one job. It stops those rulebooks being invented from scratch every time.

ISO 14025 says an environmental product declaration must follow a product category rule. It says very little about how that rule is written. ISO/TS 14027 fills the gap.

ISO/TS 14027 in brief

Here are the facts worth having in front of you before the detail.

A Technical Specification is a slightly lighter class of ISO document than a full International Standard, published when a subject is settled enough to be useful but still developing. In practice it is written and used exactly like a standard, and nobody gets certified to it either way.

Two of those table rows use terms worth unpacking. A Type III environmental declaration is the formal name for an EPD.

A footprint communication is the same idea narrowed to a single impact, such as a water footprint under ISO 14046 or a product carbon footprint under ISO 14067. ISO/TS 14027 covers the rules behind both.

What a product category rule actually is

ISO/TS 14027 defines a product category rule as a set of specific rules, requirements and guidelines for developing Type III environmental declarations for one or more product categories. Take the standards language away and it answers a very practical question.

If two companies both want to publish the environmental numbers for a corrugated shipping box, what exactly should each of them measure, over what part of the product's life, and how should they report it?

Without an agreed answer, the two sets of numbers are not comparable, however honest both companies are.

Four terms carry most of the weight in the document, and everything later leans on them.

1. Product category. A group of products that can fulfil equivalent functions. This is the boundary the rules apply to, and defining it is the first job the standard hands out.
2. Type III environmental declaration. Quantified environmental data reported using predetermined parameters, better known as an environmental product declaration or EPD.
3. Declared unit. The quantity of product the numbers are reported against. ISO's own examples are 1 kg of primary steel and 1 m³ of crude oil.
4. Programme operator. The body that runs the declaration programme, convenes the rule-writers, publishes the finished rules and keeps the register.

Those four sit inside a stack of documents, and knowing which one does what is most of the confusion around this standard.

Inside a PCR document

Clause 6.5 of the 2017 edition sets out what a finished PCR has to contain. It is the most useful part of the document for anyone who has been handed a PCR and asked whether it is any good.

Read it as a checklist. If a rulebook you have been told to follow is missing one of these six, the declarations built on it will not line up with anyone else's, which is the whole reason for having the rule.

1. The product category. What is in scope and what is not.
2. The functional unit or declared unit. The quantity everything is measured against. A functional unit describes what the product does, a declared unit is simply a quantity of it.
3. Requirements for the underlying study. How the life cycle assessment or footprint study behind the declaration must be conducted.
4. The predetermined parameters. The specific indicators every declaration in the category has to report, so nobody reports only their flattering ones.
5. The relationship to any core rules. Core rules are a set of shared requirements that sit across several product categories at once. ISO/TS 14027 names ISO 21930 for construction products as the example.
6. The conditions that support comparability. The data and modelling requirements that let two declarations in the category be read side by side.

Clause 6.6 then covers additional environmental information, the qualitative or quantitative material that is not derived from a life cycle assessment but still belongs in the declaration.

Two requirements from earlier in clause 6 shape all of this. The PCR must be based on studies that fulfil ISO 14044 and cover all life cycle stages of the products it applies to.

It must also include data quality requirements, so that different practitioners working from the same rulebook produce consistent results.

There is also a line that saves a great deal of wasted effort. If an existing PCR can be used or amended, the standard says that is what should happen, rather than writing a new one.

How a PCR gets written and reviewed

A PCR is not drafted by one company. ISO/TS 14027 treats it as a governed process with a defined start, a consultation step, an independent check and an end date, and the four stages below run in that order.

1. A committee is formed. The programme operator notifies interested parties, establishes a PCR committee for the chosen category, and has to ensure a balanced mix of perspectives and competencies. If an interested party is left out, the exclusion has to be justified.
2. The rules are drafted and consulted on. The committee defines the product category and drafts the rules, then the draft goes out for open consultation. The International EPD System, an international programme operator, runs that consultation for two months.
3. A review panel checks the work. A panel independent of the drafting reviews the PCR and issues a review statement. This is the gate between a draft and a usable rulebook.
4. The PCR is registered and given a shelf life. It gets an identifier and a registration code, goes on the programme's register, and is then subject to updating, revision and expiration. In the International EPD System a published PCR stays valid for three to five years.

Underneath the process sit the three principles in clause 5. Declarations rest on life cycle assessment, interested parties are genuinely involved rather than informed, and the rules aim at comparability within the category.

Who ISO/TS 14027 is written for

Most people meet this standard through a role rather than by choosing to read it, so it helps to know which seat you are in.

That last row is the biggest group by far. Most producers never draft a PCR. They inherit one, and their declaration is only as credible as the rulebook behind it.

Where ISO/TS 14027 matters for producers

The demand for verified environmental numbers is arriving from two directions at once, and both of them land on the PCR.

The first is commercial. Large buyers, retailers and public procurement teams increasingly ask for an EPD before a product gets considered.

An EPD is only useful in that conversation if it can be set beside a competitor's, and that depends entirely on whether both were built on the same product category rule.

The second is legal. Directive (EU) 2024/825 on empowering consumers for the green transition was adopted in February 2024, had to be written into national law by 27 March 2026, and applies from 27 September 2026.

It bans generic environmental claims that cannot be demonstrated, and it requires sustainability labels to rest on a certification scheme or a public authority rather than on a company's own say-so. A declaration built on a reviewed, registered PCR is the kind of evidence that survives that test.

The limit worth being clear about

ISO/TS 14027 is not an extended producer responsibility route, and it is worth saying so plainly. The EU Packaging and Packaging Waste Regulation does not mention environmental product declarations or product category rules anywhere in its text.

Following this standard will not change an EPR fee, will not satisfy a packaging conformity obligation, and is not part of the technical documentation behind a Declaration of Conformity.

It belongs to the claims side of a producer's work, not the compliance side. Both matter, and they run on different tracks.

ISO/TS 14027 next to ISO 14025 and EN 15804

The single most common mix-up is treating ISO/TS 14027 as a PCR. It is not one. It is the specification for writing them, so it never tells you what to measure for any actual product.

One more distinction is worth holding onto, because it catches people out. Clause 6.3 requires a PCR to include requirements for comparability within its product category.

It then says outright that this comparability is not enough on its own to support a comparative claim or a comparative assertion.

Two EPDs written under the same rulebook are far easier to read together. That still is not the same as being licensed to say your product is better.

Frequently asked questions about ISO/TS 14027

Short, plain answers to the questions that come up most often about this standard.

What is ISO/TS 14027?

ISO/TS 14027, often written simply as ISO 14027, is the ISO technical specification published in 2017 that sets out how product category rules are developed, reviewed, registered and updated.

Product category rules are the shared rulebook behind environmental product declarations, and this document exists to make sure they are written to a consistent quality.

Is ISO/TS 14027 a certification?

No. It is a Technical Specification that programme operators and PCR committees conform to when they write rules, not a scheme you get audited and certified against. Nobody holds an ISO/TS 14027 certificate.

What is the difference between ISO/TS 14027 and ISO 14025?

ISO 14025 covers Type III environmental declarations and the programmes that issue them, and it requires those programmes to have product category rules. ISO/TS 14027 covers how those rules are written, consulted on, reviewed and retired.

One sets up the declaration, the other sets up the rulebook the declaration follows.

Is ISO/TS 14027 itself a product category rule?

No, and this is the most common mix-up. ISO/TS 14027 contains no requirements about any specific product. EN 15804 and ISO 21930 are examples of real core rules for construction products, and those are the documents that tell you what to measure.

Does a shared PCR let me say my product is better than a competitor's?

Not on its own. Clause 6.3 of ISO/TS 14027 says plainly that the comparability a PCR provides is not sufficient for a comparative claim or a comparative assertion. It makes two declarations readable side by side, which is a different and lower bar.

Is ISO/TS 14027 required by EU packaging rules?

No. The EU Packaging and Packaging Waste Regulation does not mention environmental product declarations or product category rules. Where the standard becomes relevant is in substantiating environmental claims, particularly under Directive (EU) 2024/825, which applies from 27 September 2026.

How long does a product category rule stay valid?

ISO/TS 14027 requires PCR to be updated, revised and eventually expired rather than left standing forever, and it leaves the timing to the programme. In the International EPD System, for example, a published PCR is valid for three to five years.

What edition of ISO/TS 14027 is current?

The 2017 first edition, published on 21 April 2017, is the current version. It is at ISO's periodic review stage, which is the routine check every published document goes through, and it has not been replaced.