# Cement & Clinker CBAM Carbon Tax Calculator (CN 2523)
> Calcination rotary kiln direct factor and clinker ratio calculations.

- **Canonical URL:** https://stanzaapi.com/tools/cbam-carbon/compliance/cement-clinker-calc
- **Governing Standard:** Regulation (EU) 2023/956 & 2023/1773 (European Commission EUR-Lex CBAM Portal)
- **Latency:** <2ms Edge
- **Privacy:** In-memory execution only (zero data stored or logged)

## Technical Overview & Governing Rules
Cement production releases significant direct CO2 during limestone calcination in rotary kilns. Clinker (CN 2523 10 00) carries a standard benchmark factor of 0.82 tCO2e/t. Finished Portland cement mixes clinker with gypsum and supplementary cementitious materials.

## Specification Matrix
| CN Code | Product Description | Sector | Direct Factor (tCO2e/t) |
| --- | --- | --- | --- |
| 25231000 | Cement clinkers | cement | 0.82 |
| 25232900 | Grey Portland cement | cement | 0.69 |

## Standard JSON Response Model
```json
{
  "cnCode": "25232900",
  "countryOfOrigin": "TR",
  "massKg": 500000,
  "totalEmbeddedEmissionsTco2e": 369.31,
  "netFinancialLiabilityEur": 26774.98
}
```

## Frequently Asked Questions & Edge Cases
### Q: What is the calcination factor for cement clinker?
**A:** Standard Annex IV benchmark direct emissions for clinker are 0.82 tCO2e per tonne.