A product category rule (PCR) in an EPD is the set of category-specific requirements that fix the goal, scope, system boundary, declared unit and calculation and reporting rules a declaration must follow, set under a programme operator to ISO 14025 and EN 15804 so declarations within a category stay comparable.
What a product category rule fixes
A product category rule pcr is the set of product-category-specific requirements that fix the goal and scope, the system boundary, the functional or declared unit, and the calculation and reporting rules an Environmental Product Declaration must follow, so that declarations within a category stay consistent and comparable. It sits at the heart of life cycle assessment work that results in a Type III EPD under ISO 14025, with the underlying study conducted to ISO 14040 and ISO 14044. A PCR is set under a programme operator and developed through an open, consultative process involving interested parties, in compliance with ISO 14025 and ISO 14044.
What the rule governs, category by category
A PCR fixes several study choices in advance, which is what makes two declarations for the same product type answer to the same rules. For construction products the core PCR is given by EN 15804 in Europe and by ISO 21930 internationally, so declarations from different programme operators align.
| Element a PCR fixes | Effect on the EPD |
|---|---|
| Goal and scope | Sets what the study includes and the basis for results |
| System boundary | Fixes the modules covered, cradle-to-gate or cradle-to-grave |
| Functional or declared unit | The reference every input, output and impact normalises against |
| Calculation and reporting rules | How the inventory becomes the declared indicators |
Why a PCR drives comparability
Comparability is the entire purpose of a PCR, yet it is bounded. ISO 14025 supports comparison of EPDs made to the same PCR, while EPDs made to different PCRs or programmes are not automatically comparable. Two further points anchor how a declaration reaches the public:
- Before publication, the LCA and draft declaration are checked by an independent third-party verifier against the applicable PCR and ISO 14025.
- The programme operator then registers the verified EPD and publishes it in its public library.
Practitioners scoping a first declaration can work through the LCA guide to see where the product category rule pcr sits within the wider study.
Sources: ISO 14025:2006 · EN 15804:2012+A2:2019 · ISO 21930:2017 · EPD International: what is a PCR