What you receive for each lot
- Per lot
Environmental impact certificate
Estimated avoided emissions with the real net weight of the lot, the factor version used and its sources. With a folio and a public verification page.
- Per lot
Purchase CFDI
The tax invoice for the transaction, with any applicable withholdings, ready for your accounts.
- Per lot
Carta Porte
The transport supplement for moving the material from the generator's yard to the mill.
- Per lot
Scale ticket
The weight with folio, date, time and photo. The basis for settlement and for the certificate.
- Per lot
Chain of custody
Handover records signed by each party, with the time they were signed, from pickup to the plant.
- Periodic
Consolidated sustainability report
For recurring clients: tonnes, materials and avoided emissions by period and by plant, with the list of certificates behind it.
Sample certificate
This is how an impact certificate reads. The data is an example and does not belong to any client.
| Field | What it contains | Example |
|---|---|---|
| Folio | Unique, verifiable certificate identifier | BG-2026-000142 |
| Generator | Legal name and tax ID of whoever sold the material | Example Company, S.A. de C.V. |
| Material | Family and grade of each item in the lot | Carbon steel, HMS 1 |
| Net weight | Real scale weight, in kilograms | 18,420 kg |
| Date | Day the lot was paid | November 12, 2026 |
| Avoided emissions | Net tonnes times the factor of each family | Per the current factors |
| Factor version | Which factor set was used, and whether it is preliminary | v0.1, preliminary |
| Sources | Publications the factors come from | List of sources with links |
| Verification | Link and code to check the document without an account | Public page for the folio |
The full calculation, its rules and its limits are in the impact methodology.
Who uses each document
| Who | What they use | What for |
|---|---|---|
| Accounting | CFDI and settlement statement | Record the income and withholdings |
| Tax compliance | CFDI, Carta Porte and scale ticket | Prove the transaction to the tax authority if reviewed. See regulation |
| Environmental | Chain of custody and final destination | Prove the waste reached a formal recycler |
| Sustainability | Certificates and consolidated report | Report avoided emissions separately, as the GHG Protocol asks1 |
| Audit | Verification page for each folio | Check that the document is authentic |
Guide: steel recycling in Mexico
A summary with public data, for anyone who needs the context on one page.
- 13.5 Mtof crude steel produced in Mexico in 2025 2
- 95.9%was made in electric arc furnaces, which melt mostly scrap 2
- 30.3%is the electric furnace share worldwide 2
- 0.69 tof CO₂ per tonne for scrap based steel, against 2.34 t for the ore route 3
- Mexico runs on scrap. With almost all its steel made in electric furnaces, scrap is its main steelmaking raw material2. See how steel is made.
- Trade both ways. In 2025 Mexico exported 1.6 million tonnes of ferrous scrap and imported 1.4 million2.
- Quality rules. Copper and tin cannot be removed in the furnace; clean, well graded scrap is worth more and lets mills use more scrap4.
- Formality. Every sale carries a CFDI and every federal highway move carries a Carta Porte. See the applicable regulation.
- Measurable impact. The scrap route emits less than a third of the CO₂ per tonne of the ore route3. See the environmental impact.
Frequently asked questions
When do I get the certificate?
When the lot is paid, because that is when the real net weight is closed.
Can I get a report per plant or per year?
Yes. Recurring clients receive a consolidated report per period and, if they have several plants, split by plant.
Can the certificate be used as a carbon credit?
No. It is a documented estimate of avoided emissions for your sustainability report, not a tradable instrument.
Sources
Every figure on this page comes from a third party publication. Names and logos belong to their owners and only identify the source; they do not imply endorsement.
- GHG Protocol (WRI and WBCSD)Technical Guidance for Calculating Scope 3 Emissions, version 1.0, category 5 (2013)Open the publication
- World Steel Association (worldsteel)World Steel in Figures 2026 (2026)Open the publication
- World Steel Association (worldsteel)Sustainability Indicators Report 2025 (2025)Open the publication
- Environmental Science & Technology (ACS)Daehn, Cabrera Serrenho and Allwood, How Will Copper Contamination Constrain Future Global Steel Recycling?, 51(11):6599 a 6606 (2017)Open the publication
