What actually happened
YKK AP’s BetterBillet kept the spotlight in December, with trade press highlighting its lower‑carbon positioning and U.S. production. The billet blends recycled material with primary aluminum from low‑carbon North American suppliers, and the company documents an average of 40 percent recycled content with at least 80 percent of primary purchased from low‑carbon sources (YKK AP, 2025) (YKK AP, 2025).
Why this shifts your EPD math
Primary aluminum’s global cradle‑to‑gate average sat around 14.8 t CO2e per ton in 2023, so sourcing below that baseline moves the needle in A1–A3 right away (International Aluminium Institute, 2024) (IAI, 2024). Many “low‑carbon” offers target footprints at or below 4 t CO2e per ton, which is a commonly referenced threshold in the market, though definitions vary by scope and boundary, so verifiers will check the fine print (International Aluminium Institute, 2024) (IAI Low‑Carbon Factsheet, 2024).
The recycled content kicker
Recycling uses about 5 percent of the energy of primary production, and typically cuts associated emissions by a similar magnitude in gate‑to‑gate terms. That is why even modest increases in post‑industrial or post‑consumer scrap share can materially lower your EPD’s embodied carbon number (The Aluminum Association, 2025) (Aluminum Association, 2025). It sounds obvious, but it is definately the fastest lever most window and curtain wall producers can pull without redesigning systems.
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What data owners should copy from YKK AP
Owning melt and cast steps simplifies data collection, gives tighter alloy control, and reduces uncertainty in bill‑of‑materials and energy inputs. Those three things translate into smoother verifier reviews and fewer model rewinds when preparing product‑specific Type III EPDs. If you outsource billets, audit suppliers for metered energy, scrap streams, and declared footprints with clear system boundaries. Ask for third‑party verified numbers that align to your chosen PCR.
Implications for LEED v5‑era bids
Procurement teams increasingly compare product‑specific EPDs side by side rather than rely on industry averages. Lower‑carbon billet declarations improve your position in those comparisons, reduce penalty factors when a modeler must choose defaults, and keep your products in play on projects tracking embodied‑carbon budgets. The commercial upside is fewer last‑minute substitutions and faster approvals when the spec calls for verified transparency.
Your next three moves
- Confirm the aluminum mix in your 2024–2025 reference year, including recycled share and any low‑carbon contracts, then lock those values in your LCA plan.
- Align on a PCR and a program operator, and verify what evidence the verifier expects for supplier footprints and electricity factors.
- Schedule updates before expiries cluster, so sales is never explaining an almost‑expired EPD during a bid week.
The takeaway for manufacturers
December’s buzz around lower‑carbon billets is not just branding. It is an operations story that shortens the path to credible, competitive EPDs. Control more of the inputs, document them clearly, and your numbers get better and your reviews get quicker.
