Standard resin-code formPlastic resin identification
Plastic resin code 6 — PS
6 PS identifies Polystyrene. It does not by itself confirm that the item is accepted by a local recycling service.
6 PSInternationalcode format standardised through ASTM in North America
At a glance
What this symbol means
The resin identification code identifies the predominant plastic resin family as Polystyrene. It is primarily a material-sorting code.
The resin number identifies polymer type. Local collection rules still determine whether the specific package or product is accepted.
Recognition
How to recognise it
- Look for the number 6 with PS.
- Expanded foam may be marked EPS even when the resin family is polystyrene.
Typical applications
Where it commonly appears
- rigid yoghurt or dessert pots
- foam protective packaging
- disposable food-service items
Practical decision
How to sort or dispose of it
- Check whether the local service accepts rigid PS, expanded foam, both or neither.
- Use a specialist foam route for clean protective packaging when available.
- Keep food-service foam out of recycling unless explicitly accepted.
Before disposal or return
- Remove food and tape where practical.
- Keep clean protective foam dry.
- Do not break foam into small pieces outdoors.
Avoid contamination
Common mistakes
Putting all foam in a plastics bin.
Confusing compostable loose-fill with expanded polystyrene.
Assuming code 6 gives a local collection route.
Important limitation
What it does not mean
The triangular code is not a universal recycling approval, does not describe contamination, and does not tell you whether the local service accepts that product format.
Questions
Frequently asked questions
Does 6 PS mean the item is recyclable?
No. It identifies the resin. Collection, sorting capacity, contamination and end markets determine whether the exact item is accepted.
Why can two items with the same code have different instructions?
Shape, size, colour, additives, labels, food residue and whether the item is packaging can change how a local facility handles it.
Should I follow the number or the local disposal label?
Use the number to identify material, then follow the product-specific and local disposal instruction.
Verification
Sources
ASTM D7611/D7611M — Resin Identification Coding SystemOpen source ↗U.S. EPA — How to recycle common materialsOpen source ↗
Sources checked 15 August 2026
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