The 1988 plastic resin code standardization — establishing the familiar triangular numbered symbols (1 PET, 2 HDPE, 3 PVC, 4 LDPE, 5 PP, 6 PS, 7 Other) — created framework for plastic recycling identification that subsequently shaped consumer recycling practice and industry coordination. The Society of the Plastics Industry (SPI) developed the codes following industry need for standardized plastic identification. Understanding the standardization history provides B2B context for plastic categorization and recycling industry development.
Jump to:
- Pre-1988 Plastic Identification Context
- The 1988 SPI Resin Code System
- What the Standardization Achieved
- Modern Resin Code Reality
- Compostable Plastics in Code System
- Subsequent Industry Evolution
- What This Historical Context Means for B2B Procurement
- What "Done" Looks Like for End-of-Life-Aware Procurement
This guide is the working B2B reference on the 1988 plastic resin code standardization.
Pre-1988 Plastic Identification Context
Before 1988, plastic identification was inconsistent:
No standardized symbols for plastic types.
Limited recycling industry infrastructure.
Inconsistent consumer awareness.
Industry coordination challenges.
The lack of standardization complicated emerging recycling industry.
The 1988 SPI Resin Code System
In 1988, SPI introduced resin identification codes:
1 (PET) Polyethylene Terephthalate: Bottles, food containers.
2 (HDPE) High-Density Polyethylene: Milk jugs, detergent bottles.
3 (PVC) Polyvinyl Chloride: Various products.
4 (LDPE) Low-Density Polyethylene: Plastic bags, films.
5 (PP) Polypropylene: Various containers, bottle caps.
6 (PS) Polystyrene: Foam, plastic cups.
7 Other: Various other plastics including PLA bioplastic.
The standardized symbols enabled consistent industry identification.
What the Standardization Achieved
The resin code system achieved:
Industry-standard identification for plastics.
Consumer awareness of plastic types.
Recycling infrastructure support.
Cross-industry communication facilitation.
Subsequent international adoption.
Modern Resin Code Reality
Today’s resin code reality:
Limited recycling reality for most plastic codes.
1 (PET) and 2 (HDPE) primarily recycled.
Other codes (3-7) limited recycling.
Consumer confusion about which actually recycled.
Symbol persistence despite limited recyclability for many.
The original recycling promise of universal plastic recycling didn’t materialize for most codes.
Compostable Plastics in Code System
PLA and other compostable plastics:
Coded as 7 (Other) typically.
Not aligned with conventional recycling.
Different end-of-life pathway (composting).
Customer confusion between #7 plastic and compostable plastics.
For B2B compostable procurement, the resin code limitations create customer education opportunities about compostable end-of-life pathway.
Subsequent Industry Evolution
After 1988:
Recycling industry development through 1990s.
Recycling rate plateau through 2000s-2010s.
2018 China recycling ban dramatic disruption.
Subsequent reduced recycling for many materials.
Compostable industry emergence as alternative.
The trajectory shows accumulated 35+ years of plastic end-of-life pathway development.
What This Historical Context Means for B2B Procurement
Several insights for modern compostable procurement:
Customer Education Opportunity
Modern compostable programs benefit from customer education about end-of-life pathway distinct from plastic recycling.
Compostable Distinct from Recyclable
Compostable products serve different end-of-life pathway than recycling. Customer communication should clarify.
Continued End-of-Life Evolution
The 1988 → 2025+ trajectory illustrates continued end-of-life pathway evolution. Modern operations should expect continued development.
What “Done” Looks Like for End-of-Life-Aware Procurement
A B2B operator with end-of-life pathway awareness:
- Understanding compostable distinct from recyclable
- Customer-facing communication clarifying pathway
- Appropriate end-of-life infrastructure verification
- Multi-pathway approach across operations
The supply chain across compostable food containers, compostable bowls, compostable cups and straws, compostable bags, and compostable cutlery and utensils supports compostable end-of-life pathway distinct from plastic recycling.
For B2B operators evaluating end-of-life pathway communication, the resin code history illustrates how customer awareness of plastic types developed through standardization. Modern compostable program success benefits from similar customer education about composting as distinct end-of-life pathway from recycling.
Compostability Standards Reference
If you are evaluating compostable packaging on a procurement spec, the three claims worth verifying on every SKU are: (1) a current third-party certificate (BPI or TÜV Austria); (2) the underlying standard reference (ASTM D6400 for North America, EN 13432 for the EU); and (3) a clear end-of-life qualifier in marketing copy that complies with the FTC Green Guides. Generic “eco-friendly” or “biodegradable” without certification is the most common compliance gap for U.S. brands.
Frequently Asked Questions
Is industrial composting accepted in my municipality?
Industrial composter access varies by zip code. Use the U.S. Composting Council facility locator and the EPA composting guidance page; if no industrial facility accepts compostable foodware in the customer’s area, the FTC Green Guides require a “compost where facilities exist” qualifier.
What is the difference between BPI-certified and “made with PLA”?
BPI certification is SKU-specific and requires testing of the finished product — including any inks, coatings, and adhesives. “Made with PLA” only describes a single component and is not a substitute. For procurement contracts, lock the certification number, not the material name.
How long does industrial composting actually take?
ASTM D6400 sets the bar at 90% biodegradation in 180 days under controlled industrial conditions (58 °C, controlled moisture). Real-world municipal facilities typically run 60–90 day cycles, faster than the standard worst case. Items still visible after one cycle are typically removed and re-fed, not landfilled. (source: EN 13432 baseline)
To browse our certified compostable catalog, see compostable supplies catalog or compostable bags.