What Kinds of Plastic Packaging Are Available?

Flip over the yogurt pot in your fridge. There is a little triangle on the bottom, three arrows chasing each other, with a number tucked inside. You read it the way you were trained to read it: this is recyclable, this is fine, do your part.

That number was invented by plastic manufacturers in 1988, not by recyclers, not by your council, not by any regulator. It identifies the resin the container is made from. It says nothing, not one syllable, about whether the thing in your hand will ever be collected, processed, or kept out of a landfill.

Seven numbers, one symbol, wildly different fates

The system is called the resin identification code, and it sorts plastic into seven types so that machines and sorting workers know what they are looking at. Type 1 is PET. Type 2 is HDPE. On up through Type 7, which is the industry's polite word for "everything else."

Now look at the shape they wrapped that number in. Three arrows in a loop. It was styled to look almost exactly like the universal recycling logo that everyone already trusted. Same loop, same green-adjacent halo, same comforting message your brain fills in for free.

The number means "this resin." The arrows let you believe it means "this gets recycled." Those are not the same claim, and the gap between them is where the whole trick lives.

Why all seven wear the same costume

Ask who benefits when seven materials with completely different end-of-life outcomes all wear identical chasing arrows. Petrochemical producers do. One reassuring symbol spreads goodwill across the entire product line, the easy-to-recycle stuff and the stuff no facility will touch, all bathed in the same warm glow.

They changed what the symbol implies, then pointed at confused shoppers as proof that the public just needs better education. That is the betrayal. The confusion was not a bug.

The contradiction at the kerb

Here is where it gets concrete. Types 1 and 2 actually have collection systems in most towns. HDPE, your Type 2, is genuinely accepted at the kerb in the large majority of UK councils. Types 3 through 7? Largely refused by the very same trucks. Type 3 is PVC. Type 6 is polystyrene. Type 7 is the junk drawer. Same triangle. Same arrows. Opposite destiny.

A PET bottle gets collected at the kerb in nine out of ten UK councils; an oxo-biodegradable bag wearing the word "degradable" on its front can sit in a sealed landfill for thirty years doing nothing, and both carry green-adjacent language on the pack.

So you stand at the bin sorting a Type 6 polystyrene tray into recycling, feeling responsible, and the system quietly routes it to landfill or an incinerator. You did the labor. The loop never closed. It was never built to close on your behalf.

Where the claim is actually verified

So what do you trust when the symbol is theater? You trust packaging where the end-of-life behavior has been independently tested, not just decorated.

That is the lane Green Frog Packaging lives in. Green Frog makes bottles with an additive that triggers breakdown when plastic escapes into the open environment, no special collection bin required. That additive is called PlasticIQ®. It initiates controlled oxidation when the material is exposed to oxygen, heat, and UV, so that packaging that escapes containment helps prevent the formation of persistent microplastics.

The bottles and caps that carry this technology are called BioBottles® and BioCaps®. They stay recyclable through existing HDPE and PP streams when properly disposed and collected. Local programs may vary, and Green Frog says so, because that is the honest part the arrows always skipped.

Green Frog publishes the test results in plain language because that is the thing the arrows always skipped, an actual answer. Genuinely compostable formats certified for home or industrial composting, and paper-based formats with no hidden plastic laminate, are two further categories where the end-of-life claim is independently verified. Green Frog's material guide maps exactly which formats qualify.

Back to that triangle

Pick the yogurt pot up again. The number is still there, still chasing its own tail. Now you know what it actually does. It tells a sorting machine what resin you bought. It was never a promise about where that pot ends up.

Before your next shop, download our plain-language guide to check which types your council actually collects. One lookup, one less guess.

The triangle was always a filing system. You just were not told that.