Compostable vs Biodegradable Packaging: The Real Difference for Australian Businesses
"Compostable" and "biodegradable" get used interchangeably across eco-friendly packaging labels, but they are not the same thing - and for an Australian business the gap between them decides whether your packaging is genuinely sustainable, whether it is legal to supply in Victoria, and whether you are paying a premium for a claim that means nothing.
This guide gives you the short answer first, then the detail food-service buyers actually need: what each term means, the Australian standards that back a real compostable claim (AS4736 and AS5810), how Victoria's single-use plastic rules treat each material, and a clear "which should my business buy" decision for cafes, restaurants, caterers and aged care.
The Short Answer
If you only read one section, read this:
- Biodegradable means a material will eventually break down by microbial action - with no guaranteed timeframe and no required conditions. On its own it is a near-meaningless marketing word; technically even ordinary plastic is "biodegradable" over 450 to 1,000 years.
- Compostable is a defined, testable claim: the material breaks down completely into non-toxic organic matter within a set timeframe (typically 180 days) under composting conditions, leaving compost that does not harm plant growth. In Australia that claim is backed by the AS4736 (commercial/industrial) and AS5810 (home) standards.
- For a Victorian food business, buy certified compostable made from plant fibre (sugarcane/bagasse, paper, wood, bamboo) - not "biodegradable plastic". As covered below, biodegradable and "compostable plastic" versions of banned single-use items are still caught by Victoria's ban.
The Critical Difference: Compostable vs Biodegradable Explained
At first glance both terms suggest a product breaks down naturally instead of persisting for centuries like conventional plastic. The difference is what is actually guaranteed.
What "Biodegradable" Actually Means
Biodegradable means a material can be broken down by microorganisms (bacteria, fungi) into natural elements. In theory that sounds ideal. In practice it is the weaker, riskier claim, for four reasons:
No time limit - A product labelled simply "biodegradable" is not required to break down within any specific timeframe. Conventional plastic is technically biodegradable too; it just takes 450 to 1,000 years. Without a stated timeframe and conditions, the word means very little.
No conditions specified - Biodegradable products often need specific conditions (temperature, moisture, oxygen, microbial activity) that do not exist in landfill, where most waste ends up.
Risk of microplastics - Many "biodegradable" items are petroleum-based plastics with additives that make them fragment into smaller pieces. They do not return to natural elements; they become microplastics that persist in soil and water.
Not standardised - There is no single enforceable "biodegradable" standard in Australia, so a business can make the claim with limited proof.
What "Compostable" Actually Means
Compostable is a specific, standardised term with clear requirements. A genuinely compostable product must:
- Break down completely within a defined timeframe (typically 180 days)
- Break down under composting conditions (a defined temperature, moisture and microbial environment)
- Leave no toxic residue
- Disintegrate into small pieces that integrate with compost
- Produce compost that does not harm plant growth
Compostable products are made from organic, plant-based materials that genuinely return to natural elements when composted. Common compostable materials include:
- PLA (Polylactic Acid) - made from fermented plant starch (corn or sugarcane)
- Bagasse - sugarcane fibre residue left after juice extraction
- PHA (Polyhydroxyalkanoates) - a microbially produced bioplastic
- Paper and cardboard (without a plastic coating)
- Wood, bamboo and other plant fibres
- Natural starches and cellulose-based materials
Victoria's 2026 Single-Use Plastic Rules: Why the Difference Is a Compliance Issue
For a Victorian business this is not just an environmental question - it is a legal one. Victoria's single-use plastic bans started in February 2023 (straws, plastic cutlery, plates and bowls, drink stirrers, expanded polystyrene food containers and cotton bud sticks) and expanded from 1 January 2026 to cover plastic beverage cups and lids, plastic food containers, sauce sachets and portion packs, plastic barrier bags and produce stickers.
The trap most buyers miss: a "biodegradable plastic" or "compostable plastic" version of a banned item is still banned. The exemption is about the material, not the eco-label. Swapping a banned plastic plate for a "biodegradable plastic" plate does not make you compliant; switching to a plant-fibre (bagasse, paper, wood) plate does. Items marked "degradable", "oxo-degradable" or simply "biodegradable" without certification are treated the same as conventional plastic. EPA Victoria enforces the bans, with penalties that run into the thousands for individuals and tens of thousands for businesses that supply prohibited items.
This is exactly why the compostable-vs-biodegradable distinction matters at the point of purchase. For the full banned-item list, dates and exemptions, see our Victoria 2026 plastic ban guide, and for material-by-material swaps see our eco-friendly packaging range.
Australian Compostable Standards: AS4736 vs AS5810
Australia has two standards that turn "compostable" from a marketing word into a verified claim. The difference between them is where the product is designed to break down - an industrial composting facility versus a backyard compost bin.
AS4736: Commercial / Industrial Compostable
AS4736 is the Australian standard for packaging that breaks down in commercial/industrial composting facilities. Certification requires:
Biodegradation - at least 90% of the material converts to CO2 within 180 days under commercial composting conditions (roughly 55 to 60°C with controlled moisture and oxygen).
Disintegration - after 12 weeks, no more than 10% of the original dry weight remains as pieces larger than 2mm.
Ecotoxicity - the finished compost must not harm plant growth, verified by growing plants in it against a control.
Heavy metals and chemical safety - strict limits on heavy metals (lead, cadmium, mercury and others) and no harmful chemicals leaching into the compost.
AS5810: Home Compostable
AS5810 is the Australian standard for products that break down in home composting conditions. It applies the same family of biodegradation, disintegration, ecotoxicity and chemical-safety tests as AS4736, but it is the harder standard to meet because home composting is cooler and less controlled:
Lower-temperature breakdown - products must compost at typical home-bin temperatures (around 20 to 30°C), not the 55 to 60°C of an industrial facility.
More readily biodegradable - because conditions are gentler and less consistent, the material has to be genuinely easy to break down.
Put simply: AS5810 is the stronger end-of-life claim (it composts at home or in a FOGO/green-bin stream), while AS4736 needs access to a commercial composter. Many plant-fibre items (bagasse plates, wooden cutlery) meet AS5810; PLA-based items usually meet AS4736 and need industrial composting.
AS4736 vs AS5810 at a Glance
| AS4736 (Commercial) | AS5810 (Home) | |
|---|---|---|
| Breaks down in | Industrial/commercial composter | Home compost bin or FOGO/green bin |
| Temperature | ~55-60°C, controlled | ~20-30°C, ambient |
| Timeframe | Within 180 days | Within 180 days at lower temps |
| Difficulty to certify | Standard | Stricter |
| Typical materials | PLA cups and lids, PLA-lined paper, bagasse | Bagasse, wood, bamboo, some paper |
| Best for | Venues with commercial compost collection | Home-compost or FOGO-stream claims |
How to Verify a Compostable Claim
When a supplier says a product is "certified compostable", check it:
Look for the certification mark
- Australasian Bioplastics Association (ABA) seedling mark - shows AS4736 or AS5810 compliance
- European seedling logo (EN13432) - the European equivalent of AS4736
- BPI Certified Compostable - North American certification, also recognised here
Request documentation - ask for the certificate, confirm the certifying body is legitimate, and check the certification covers the specific product, not just the raw material.
Be wary of vague claims - "compostable" with no standard quoted, "biodegradable" presented as if it means compostable, or "plant-based"/"bio-plastic" with no certification (a material can be plant-based and still not compostable).
Why "Biodegradable" Isn't Always Eco-Friendly
The marketing around biodegradable products is often misleading. Understanding why helps your business avoid greenwashed stock.
The Landfill Problem
Most Australian waste ends up in landfill, and even genuinely biodegradable products do not break down properly there. Landfills are anaerobic (compacted and covered, so little oxygen) and are deliberately designed to minimise decomposition. Without oxygen and active microbial populations, a product that would compost under proper conditions can sit for decades. Biodegradable packaging that goes to landfill delivers almost none of its promised benefit.
The Microplastics Issue
Many "biodegradable" products are petroleum-based plastics with pro-degradant additives (often metal salts) that make the plastic fragment into ever-smaller pieces. That fragmentation gets marketed as "biodegradation", but the plastic never becomes natural matter - it becomes microplastics that persist in soil and water, are eaten by wildlife, enter the food chain, can leach toxic chemicals, and are almost impossible to clean up once dispersed.
Which Should Your Business Buy? A B2B Decision Guide
For almost every Australian food business the answer is the same: buy certified compostable, avoid "biodegradable", and prefer plant-fibre materials for anything covered by a plastic ban. Use this quick decision path:
- Do you operate in Victoria (or expect a ban to reach you)? Choose certified compostable in a non-plastic material (bagasse, paper, wood, bamboo). "Biodegradable plastic" will not keep you compliant.
- Does your venue or council collect FOGO / commercial compost? AS4736 products are fine and usually cheaper - they just need that industrial stream.
- Do you want a "home compostable" or backyard claim for customers? Specify AS5810-certified items (bagasse, wood, bamboo).
- Buying in volume? Get the certificate on file once per product line so you have documented proof of compliance.
By product type, the certified compostable options that perform well for Australian food service are:
Hot Beverage Cups and Lids
Single- or double-wall paper cups with a compostable PLA lining (AS4736), paired with CPLA or fibre lids. Good heat retention and the standard cafe choice for takeaway hot drinks. Browse wholesale coffee cups and lids.
Food Containers
Bagasse (sugarcane pulp) clamshells and bowls are the workhorse - heat-resistant, sturdy, moisture-resistant, AS4736 certified, and often AS5810 as a plant fibre. Ideal for hot takeaway and most restaurant use. Browse sugarcane and eco containers.
Cutlery
Birch or bamboo cutlery is sturdy, heat-resistant, has no taste transfer, is often home compostable (AS5810), and is the most economical eco swap - close to conventional plastic pricing. Browse wooden and eco cutlery.
Bin Liners and Kitchen Caddies
For FOGO and food-waste collection, certified compostable caddy and bin liners are the right call - and here the compostable-vs-biodegradable distinction matters most, because a "biodegradable" liner can contaminate a compost stream. See our guides to 8L compostable FOGO kitchen bags and the wider biodegradable vs compostable garbage bags comparison.
Frequently Asked Questions
Is biodegradable the same as compostable?
No. All compostable products are biodegradable, but most "biodegradable" products are not compostable. Compostable is a defined, time-bound, tested standard; "biodegradable" on its own carries no required timeframe or conditions.
Which is better for my business, compostable or biodegradable?
Certified compostable, in almost every case. It is verifiable, it produces a real end-of-life benefit when composted, and in Victoria it is the path to compliance - "biodegradable plastic" is not.
What is the difference between AS4736 and AS5810?
AS4736 certifies breakdown in a commercial/industrial composter (around 55 to 60°C). AS5810 certifies breakdown in a home compost bin (around 20 to 30°C) and is the stricter, harder-to-meet standard.
Is PLA compostable?
Yes, but usually only commercially. Most PLA meets AS4736 and needs an industrial composting facility to break down within the timeframe; it generally will not compost in a backyard bin.
Are compostable products allowed under Victoria's plastic ban?
Plant-fibre compostable items (bagasse, paper, wood, bamboo) are the compliant alternatives. But "compostable plastic" or "biodegradable plastic" versions of banned single-use items are still banned - the exemption depends on the material, not the eco-label.
Switching your Melbourne business to certified compostable packaging? DPack stocks a full range of AS4736-certified compostable cups, containers, cutlery and bin liners for cafes, restaurants, caterers and aged care - all chosen to meet Victoria's single-use plastic rules. Explore the eco-friendly packaging range, with free Melbourne Metro delivery on orders over $150 ex GST.
