Carbon methodology · 2025 production data
How We Count Our Carbon - Every Number, Shown Working
Lots of companies publish a carbon figure. Few show the maths. Here is ours, line by line, from our real 2025 factory data - including what isn't verified yet.
HONESTY LABEL - READ BEFORE THE NUMBERS
These are our own calculations, prepared following EN 15804+A2 principles from measured 2025 factory data. They have not yet been verified by an independent third party. A formal, externally verified Environmental Product Declaration (EPD) is in preparation, and we will publish it - and correct this page if anything changes.
Every product has a carbon footprint: the greenhouse gas released while making it, measured in kilograms of CO₂-equivalent (CO₂e). Making 1 kg of virgin (brand-new) plastic emits roughly 2.1 kg of CO₂e - more than double its own weight in greenhouse gas. Here's what making 1 kg of our recycled lumber emits, and exactly why.
Virgin (new) plastic
~2.1 kg CO₂e per kg
Industry recycled profiles
0.6-1.4 kg (typical range)
Miell Green coloured
0.142
Miell Green grey Eco
0.073
Cradle-to-gate (A1-A3). Comparator: virgin HDPE, published values ~2.0-2.3 kg CO₂e/kg. Industry range: published recycled polyolefin profile data.
0.142
kg CO₂e per kg - coloured product (grid electricity)
0.073
kg CO₂e per kg - grey Eco product (grid electricity)
~93%
lower than virgin plastic (~2.1 kg CO₂e/kg)
01 WHAT "CRADLE TO GATE" MEANS
Our figure counts everything from raw material to the factory gate: the materials themselves (A1), lorries bringing them in (A2), and the electricity used to make the product (A3). It does not include delivery to you - we report that separately (about 0.192 kg CO₂e/kg from Hungary to Scotland today, dropping ~85% once UK production starts).
02 THE RECIPE FOR 1 KG OF COLOURED PRODUCT
| Where the 0.142 kg CO₂e comes from | |
|---|---|
| Where the 0.142 kg CO₂e comes from Recycled plastic feedstock - already waste, so it arrives carbon-free under the EN 15804 "end-of-waste" rule | 0.000 |
| Colour masterbatch & UV stabiliser - the additives (2.5% average in 2025; 2.5 to 4% depending on product and colour), the single biggest source | 0.070 |
| Inbound transport - lorries from Győr (55 km), Fehérvár (105 km), Balotaszállás (255 km); UV stabiliser by sea from Israel | 0.018 |
| Factory electricity - 0.32 kWh per kg on the Hungarian grid (17% already from our rooftop solar) | 0.056 |
| Total per kg | 0.142 kg CO₂e |
Notice something? The plastic itself contributes zero. That isn't a trick - it's the internationally agreed rule: waste that has already served its first life carries no manufacturing burden into its second. The carbon cost of our product is really the cost of colouring it, moving it and powering the factory.
03 WHAT THAT MEANS FOR ONE BENCH
A 65 kg garden bench works out at roughly 9 kg of CO₂e to manufacture. For scale, that's about the same as driving a typical petrol car 50 km - one trip from Glasgow to Stirling. Making the same bench from virgin plastic would emit around 135 kg - fifteen times more.
04 THE FACTORY DATA BEHIND IT
| 2025 figure (Mezőlak, Hungary) | Value |
|---|---|
| Product manufactured | 860 tonnes |
| Total electricity used | 276,015 kWh |
| Electricity intensity | 0.32 kWh per kg of product |
| Natural gas | 0 m³ (electric forklifts, no gas heating of material) |
| Feedstock | 100% recycled plastic waste: PP 50%, PE 25%, PET 25% |
| Additives | 2.5% colour masterbatch & UV stabiliser by weight |
| Packaging | Our own recycled plastic pallets, reused (0 km transport) |
05 THE EMISSION FACTORS WE USED
| imput | FACTOR | SOURCE |
|---|---|---|
| Recycled feedstock | 0 | EN 15804+A2 end-of-waste rule |
| Masterbatch & UV stabiliser | 2.8 kg CO₂e/kg | Ecoinvent database |
| Road freight | 0.105 kg CO₂e/t·km | DEFRA / UK Government 2024 |
| Sea freight | 0.012 kg CO₂e/t·km | UK Government 2024 (container ship) |
| Hungarian grid electricity | 0.206 kg CO₂e/kWh | IEA national grid factor, 2023 |
| Rooftop solar | 0 | Self-generated; capital goods excluded per ISO 14044 |
06 WHAT HAPPENS NEXT
Self-calculated figures, however careful, are still homework we marked ourselves. So we're commissioning a full ISO 14040/14044 lifecycle assessment leading to a published, independently verified EPD under EN 15804+A2 - the same standard used across the UK construction industry. Our factory is collecting the 12 months of structured data the verifiers require. When the verified numbers land, they replace these, whichever direction they move.
Questions or challenges welcome
If you're a specifier, buyer or just curious and want the full calculation workbook, we'll send it. If you spot an error, even better - tell us and we'll fix it publicly.
Request the full calculation workbook >
Scope: cradle-to-gate (modules A1-A3), 2025 production year, prepared to EN 15804+A2 principles. Figures are self-declared and not yet third-party verified; a formal EPD is in preparation. Green-electricity variants (0.088 coloured / 0.018 grey Eco) will be reported once Guarantee of Origin certificates are confirmed by our supplier. Car comparison based on a typical petrol car at ~0.17 kg CO₂e/km (UK Government 2024 factors)
PLASTIC MATERIAL