How to Read a Third-Party LCA: An ISO 14044 and ISO 14067 Worked Example for Material Buyers

What an LCA is, and what ISO 14044 and ISO 14067 govern

A life cycle assessment quantifies the environmental impacts of a product across its life cycle, from raw-material extraction through production, use, and end of life. Two ISO standards anchor the credible practice:

• ISO 14044 specifies the requirements and guidelines for conducting an LCA: defining the goal and scope, the system boundary, the functional unit, the inventory analysis, the impact assessment, and the interpretation. An LCA “conducted to ISO 14044” followed a recognized methodology.
• ISO 14067 specifies the principles and requirements for quantifying the carbon footprint of a product specifically (the greenhouse-gas dimension), building on the LCA framework. A “carbon footprint analysis to ISO 14067” is the GHG-focused calculation.

Conformance to these standards, especially with third-party verification, is what separates a real LCA from a spreadsheet. But conformance tells you the method was sound; it does not by itself tell you the result is favorable for your use case. For that, you read the assumptions.

The five things to read in any LCA

1. The functional unit

The functional unit is the basis of comparison: one kilogram of material, one filled package, one square meter of coating, a year of service. Every impact number is “per functional unit,” and two LCAs are only comparable if they use the same one. A supplier that reports impact per kilogram of raw filler and a competitor that reports per finished part are not directly comparable until you normalize. This is the single most common place buyers are misled, usually unintentionally.

2. The system boundary

The boundary defines what is counted. “Cradle to gate” counts raw-material extraction through the factory gate but stops there. “Cradle to grave” includes use and end of life. “Cradle to cradle” includes recycling loops. A favorable cradle-to-gate number can hide a poor end-of-life profile, and vice versa. Always check whether the boundary matches the comparison you are trying to make. A carbon-negative cradle-to-gate claim is a real and useful statement, but it is a statement about production, not about the whole life of the product in your application.

3. The carbon accounting, including biogenic carbon

This is where “carbon negative” claims live. A biogenic material can legitimately be carbon negative within a defined boundary if the carbon it contains was drawn from the atmosphere (for example, biologically precipitated calcium carbonate that fixed atmospheric carbon during formation) and that uptake exceeds the emissions of harvesting and processing. The claim is sound if: the biogenic uptake is counted by a defensible method, the boundary is stated, and the result is third-party verified to ISO 14067. The claim is weak if the uptake accounting is hand-waved or the boundary is chosen to flatter the number. Read how the negative figure is derived, not just that it is negative.

4. The data quality and sources

LCAs run on inventory data: energy use, transport, process inputs. Check whether the data is primary (measured at the actual site) or secondary (database averages), how recent it is, and whether the LCA discloses its sources. A third-party-verified LCA with primary data is the gold standard. A self-declared LCA on old database averages is weaker, even if the headline number looks the same.

5. The verification and the practitioner

Was the LCA conducted or reviewed by an independent third party, and is there a verification statement or an Environmental Product Declaration (EPD) you can cite? An EPD is a standardized, third-party-verified LCA summary, and it is the most procurement-friendly form because it is built for comparison. A claim backed by a verifiable EPD is stronger than one backed by an unpublished internal study.

A worked reading: a biogenic calcium carbonate LCA

Suppose a supplier of biologically precipitated calcium carbonate publishes an ISO 14044 LCA and an ISO 14067 carbon footprint analysis, both third-party verified, claiming a negative carbon footprint and listing certifications such as ISO 9001 quality management, ASTM D6866 biogenic content, and a recognized sustainability rating. Here is how a buyer reads it:

• Functional unit: confirm it is per kilogram of the material in the form you will buy (e.g., powdered grade), so you can compare it to alternative fillers on the same basis.
• System boundary: note whether the carbon-negative claim is cradle-to-gate (production) or broader. A cradle-to-gate negative number is credible and useful for comparing fillers, but it is a production claim; your finished product’s footprint also depends on your process and the part’s end of life.
• Carbon accounting: check that the negative figure comes from genuine atmospheric uptake during the material’s biogenic formation, counted by a stated method, not from offsets bolted on afterward. ASTM D6866 supports the biogenic-content portion of the story by measuring the biobased fraction.
• Data and verification: confirm third-party verification and look for an EPD. The presence of ISO 9001 and a recognized sustainability rating adds organizational credibility but is not itself the LCA result; keep the cert stack and the LCA result distinct in your evaluation.

Read this way, a strong LCA earns trust on its specifics, and a weak one reveals itself when the boundary or the carbon accounting will not bear scrutiny.

Using LCAs to compare materials, not just to trust one

The reason to learn this skill is comparison. Buyers choosing among sustainable fillers (biogenic calcium carbonate, biochar, recycled glass, conventional ground or precipitated calcium carbonate) should normalize every candidate’s LCA to the same functional unit and boundary, then compare. A supplier with a glossy carbon-negative claim and a narrow boundary may look better on paper than a competitor with a more honest, broader boundary. The level playing field is the normalized comparison, and it is exactly the analysis ECS runs so buyers are not swayed by whichever supplier framed its number most favorably.

How ECS helps

ECS is a multi-vendor materials consultant, not a single-material seller. We collect each candidate supplier’s LCA and EPD, normalize them to a common functional unit and system boundary, verify the carbon accounting and the third-party statements, and present a like-for-like comparison so your sustainability decision rests on comparable data. We respect suppliers with genuinely strong LCA stacks and say so; we also flag where a favorable headline number depends on a flattering boundary. For specifiers documenting LEED biobased-content credits or EPR eco-modulation, we help assemble the paperwork that the claim actually supports.

To compare materials on verified life-cycle data, request a quote with your application and the claim you need to document.