What do recycling codes mean?
When it comes to recycling plastics, the numbers imprinted on packaging play a crucial role in determining how materials are processed, reused, or disposed of. These numbers, known as resin identification codes (RICs), range from 1 to 7 and correspond to different types of plastic. While they provide valuable information about recyclability, not all plastics are created equal, and understanding these codes can help households and businesses make more sustainable choices.
what are recycling numbers, and why do they matter?
Recycling numbers are typically found inside a triangle of arrows on plastic items. Each number signifies the type of plastic resin used to manufacture the product. These codes were introduced to streamline the recycling process by helping waste management facilities identify and sort plastics effectively. However, they are not a direct guarantee that the item is recyclable in all locations. Factors such as local recycling capabilities and contamination levels often determine whether a specific plastic type can be recycled.
For New Zealand, recent updates in recycling practices aim to simplify the system. Most Kiwis now have access to standardized recycling services, enabling consistent handling of common recyclable materials. However, challenges remain in processing certain plastics, highlighting the need for better consumer awareness and infrastructure improvement
understanding the seven recycling codes
1. PET (Polyethylene Terephthalate)
PET is one of the most commonly recycled plastics, often used in water bottles, soft drink containers, and food packaging. This material is lightweight, transparent, and highly recyclable. When processed, PET can be turned into products like polyester clothing, carpets, or new bottles.
- Recyclability in NZ: Widely accepted in kerbside recycling systems across the country. Rinse thoroughly to avoid contamination.
- Challenges: Contaminated PET often ends up in landfills, reducing its recycling rate
2. HDPE (High-Density Polyethylene)
HDPE is a durable plastic commonly found in milk bottles, shampoo containers, and detergent packaging. Known for its strength and resistance to moisture, this plastic is a favorite for recycling programs.
- Recyclability in NZ: Almost universally recyclable in New Zealand. It is often reprocessed into items like piping, crates, or garden furniture.
- Challenges: Colored HDPE can be harder to recycle due to pigmentation
3. PVC (Polyvinyl Chloride)
Used in products like plumbing pipes, cling wrap, and window frames, PVC is less commonly recycled due to the toxic byproducts released during processing.
- Recyclability in NZ: Limited recycling options are available. Often considered non-recyclable in kerbside systems.
- Challenges: Disposal of PVC can lead to environmental pollution unless handled with specialized equipment
4. LDPE (Low-Density Polyethylene)
LDPE is soft and flexible, often used for grocery bags, bread packaging, and squeezable bottles. While it is recyclable, collection systems for this plastic are less widespread.
Challenges: Thin plastic films are prone to contamination and clogging machinery
Recyclability in NZ: Few facilities accept LDPE. Encouraging reuse or opting for alternatives is advised.
5. PP (Polypropylene)
Polypropylene is a versatile plastic used in food containers, yogurt tubs, bottle caps, and straws. Its durability and resistance to heat make it a popular choice for packaging.
- Recyclability in NZ: Increasingly accepted in recycling programs, though some regions may still face limitations.
- Challenges: Due to its higher melting point, PP requires specialized equipment to recycle efficiently
6. PS (Polystyrene)
Polystyrene, commonly known as Styrofoam when expanded, is used in takeaway containers, disposable cups, and packaging materials. This lightweight material poses significant recycling challenges.
- Recyclability in NZ: Rarely accepted in kerbside collections. Expanded polystyrene (EPS) is particularly problematic due to its fragility and the space it occupies in landfills.
- Challenges: High contamination rates and limited recycling options mean most PS ends up as wastePurpose Fill – Waikato Skip BinsPurpose Fill – Waikato Skip Bins.
7. Other (Miscellaneous Plastics)
Plastics labeled as “Other” are a mix of polymers not covered by the first six categories. This category includes polycarbonate (found in baby bottles) and bioplastics.
- Recyclability in NZ: Generally not recyclable in kerbside programs. These plastics often require specialized facilities that are rare.
- Challenges: The variability in materials makes sorting and processing difficult. Many of these items are better suited for reuse or avoided altogether
challenges in recycling plastics
Despite the standardized numbering system, the reality of plastic recycling is complex. Common obstacles include contamination from food residues, lack of processing facilities for certain plastics, and market limitations for recycled materials. For instance, while PET and HDPE are widely recycled, other plastics such as LDPE and PS remain problematic due to economic and technological barriers
New Zealand faces unique challenges in managing plastic waste, with its geographical isolation impacting the viability of exporting recyclables. Efforts are underway to increase domestic processing capabilities and encourage waste reduction at the source
how purpose fill supports recycling
At Purpose Fill, we aim to make waste management straightforward and environmentally responsible. Whether it’s managing green waste, clean fill, or mixed rubbish, our skip bins are designed to handle a wide range of materials efficiently. By using our services, you can ensure that recyclable plastics are separated and processed according to local regulations.
Understanding Your Yellow Bin: Sorting Plastics Correctly
The yellow Hamilton council recycling bin ( guide to kerbside collection,) is designated for clean, recyclable plastics, but not all plastics are accepted. Only plastics with recycling numbers 1, 2, or 5—commonly found in items like milk bottles, soda bottles, and some takeaway containers—can go in this bin. These materials are recyclable and less likely to contaminate the recycling stream.
Plastics with numbers 3, 4, 6, or 7 (such as PVC pipes, plastic bags, polystyrene, and multi-layered packaging) should not go into the yellow bin. These materials are either non-recyclable, require specialized facilities, or risk contamination that can cause entire batches of recycling to be sent to landfills. Soft plastics, even if recyclable through special programs, can tangle in machinery and disrupt the recycling process.
To ensure effective recycling, rinse containers to remove food residue, avoid placing lids unless specified, and keep items loose rather than bagged. Adhering to these guidelines helps reduce waste contamination, ensuring materials are recycled efficiently rather than discarded as landfill waste.
If unsure about an item, consult your local council’s recycling guide or check for updates on special recycling programs for hard-to-process plastics like soft wraps and multi-material items.
Explore our skip bin hire options today to simplify your waste disposal and contribute to a cleaner, more sustainable future. Learn more about acceptable materials and how we ensure eco-friendly practices by checking out our waste disposal methods, or prohibited items.
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