ECF paper is bleached without elemental chlorine gas, but its bleaching process can still use chlorine dioxide. TCF pulp is bleached without chlorine or chlorine compounds. Hydrogen peroxide can be part of either process, so “peroxide bleached” does not, by itself, mean TCF.
If you are comparing paper for a brochure, carton or product insert, those small acronyms can make two quotes look more different—or more similar—than they really are. Here is how to read them without turning a printing decision into a chemistry project.
ECF, TCF and PCF: the quick comparison
| Term | What it tells you | What it does not tell you |
|---|---|---|
| ECF: elemental chlorine free | No elemental chlorine gas is used in bleaching. Chlorine dioxide can still be used. | It does not mean the process avoids every chlorine compound. |
| TCF: totally chlorine free | Virgin pulp is bleached without chlorine or chlorine compounds. | It does not mean the paper is made from recycled fiber. |
| PCF: processed chlorine free | Recovered fiber is processed and whitened without adding chlorine-based bleaching chemicals during recycling. | It does not establish how that fiber was bleached before it was recovered. |
“Virgin” means fiber that has not previously been used in a paper product. “Recovered” means fiber collected for reuse. Canopy’s EcoPaper Database FAQ makes this distinction when explaining TCF and PCF. For a sheet made from a blend, check which claim applies to each portion.
Where hydrogen peroxide fits
Paper mills bleach pulp to change its color and brightness. That can involve several stages, rather than one chemical doing the entire job.
The World Bank Group’s pulp-and-paper guidelines describe hydrogen peroxide in both ECF and TCF bleaching. An ECF sequence can use peroxide alongside stages involving chlorine dioxide. A TCF sequence uses non-chlorine chemicals, which can include peroxide, oxygen or ozone.
For a real manufacturing example, UPM describes oxygen, hydrogen peroxide or ozone as bleaching agents for its TCF fluff pulp. That describes UPM’s product; it does not establish the process used for a different paper.
The useful question is: “Was any chlorine-containing bleaching chemical used in this pulp’s process?” Asking only whether peroxide was used leaves part of the story unanswered.
A paper quote can make two different claims
Hypothetical example: a printer offers a brochure stock described as “30% post-consumer recycled fiber, peroxide bleached.” The first phrase tells you about part of the fiber supply. The second names a bleaching chemical.
Neither phrase tells you whether the remaining 70% of fiber is TCF. Nor does “peroxide bleached” establish that the whole sheet meets a PCF claim. You need the paper mill’s description of the recycled and virgin portions before making that statement on your brochure.
Keep these questions separate when comparing quotes:
- Fiber content: What percentage is recycled, and how much is post-consumer?
- Bleaching: Is the claimed process ECF, TCF or PCF, and which fiber portion does it cover?
- Evidence: What product specification or current certification supports the exact claim?
What the acronym cannot decide for you
A bleaching label is not a complete environmental score. Energy use, fiber sourcing, water use and waste treatment also matter. The World Bank Group guidelines discuss these as separate parts of mill performance; a single chemical name cannot stand in for that wider assessment.
It is also not a measure of how a sheet will print, fold or feel. Ask for a sample of the exact stock you are buying. Compare its finish, weight and print suitability separately from its bleaching description.
For more background on the chemistry, see our industrial peroxide bleaching overview. If you are buying peroxide for a mill process, our SDS versus COA guide explains the different roles of safety information and batch results. A paper’s ECF or TCF designation does not establish that a particular peroxide product is suitable for that process.
