Recycling glossary: ten terms warehouses get wrong

If your warehouse is touching the recycling stream at all — even just sorting and baling for pickup — there are ten terms you'll encounter and probably misuse. Most of the time misusing them doesn't matter. The time it does matter is when somebody asks for it during an audit.

1. OCC

Old Corrugated Containers. The mixed used cardboard stream that's the dominant recycled feedstock for new corrugated. Not to be confused with mixed paper (lower-grade, includes newsprint and office paper).

2. Single-stream vs dual-stream

Single-stream recycling mixes all recyclables into one bin and sorts at the MRF. Dual-stream separates paper from containers at the source. Single-stream is more convenient and less clean. Dual-stream is the reverse.

3. MRF

Materials Recovery Facility. The plant that takes mixed recyclable inputs and sorts them into clean output streams for downstream buyers. "Murf," not "em-arr-eff," if you want to sound like you've been in the industry.

4. FSC and SFI

Forest Stewardship Council and Sustainable Forestry Initiative. Both certify that paper products come from sustainably managed forests. Both have chain-of-custody programs. FSC is generally seen as the more stringent of the two, but both are widely accepted by ESG auditors.

5. ISO 14001

An environmental management system certification. If a recycling vendor claims ISO 14001 compliance, they're claiming a verified environmental management process — not that any specific number is good or bad. Useful background, not a substitute for specific diversion data.

6. Diversion rate

Percentage of inbound material that leaves a facility reused, recycled, or composted, rather than landfilled or incinerated. The number that ESG auditors most often want.

7. Pre-consumer vs post-consumer recycled content

Pre-consumer content is recovered material from the manufacturing process before reaching a customer (mill scraps, trimmings). Post-consumer is material that has reached an end consumer and been recovered (used boxes). Post-consumer is the more rigorous standard.

8. Bale grade

OCC bales are graded by quality — Grade #11 is the cleanest, Grade #12 is mixed paper, and so on. The cleaner the grade, the higher the price per ton.

9. Contamination rate

Percentage of a recycling stream that's non-recyclable contamination (plastic, food residue, wax-coated material). Mills charge back contamination, which is why clean source-separation is worth the effort.

10. Closed-loop

Used loosely. Strictly, a closed-loop recycling program is one where output material becomes input material in the same system — corrugated waste from a warehouse becomes new corrugated, used in the same warehouse. Most claimed "closed-loop" programs are not actually closed loops. Ask what's actually circular.

Why this matters

The vocabulary isn't just trivia. ESG auditors and corporate sustainability reports use these terms with specific meanings. A vendor or warehouse manager who can use them correctly comes across as serious. One who uses them loosely comes across as someone whose claims need to be checked.