How Compostar Batch-Tests Compostable Bin Liners for Real-World FOGO Use

Compostability certification is important. But for a commercial kitchen, restaurant, hotel or food business, another question matters just as much: will the liner perform consistently when it is actually filled with wet food waste?

At Compostar, we are building our quality programme around that question.

Rather than relying only on material certification or a one-time product demonstration, Compostar conducts internal batch quality inspections on finished compostable bin liners as part of ongoing production control.

Our objective is simple: to monitor whether the liners supplied today, next month and in future production runs maintain consistent dimensions, film thickness, sealing quality and real-world functional performance.

For businesses using FOGO liners every day, quality should not depend on which production batch happens to arrive.

Certification verifies compostability. Batch testing checks finished-bag performance.

Compostability standards and finished-product performance answer different questions.

AS 4736 and AS 5810 certification information supports compostability compliance for the certified formulation and authorised construction.

However, certification does not automatically mean that every council, waste contractor or organics processor will accept every liner in every FOGO or organics collection system. Businesses should always confirm local FOGO acceptance before use.

Certification also does not tell a restaurant how much wet food waste a finished liner can handle, whether the bottom seal will remain intact when the bag is lifted, or whether a production batch contains weak spots or abnormal thickness variation.

That is why Compostar treats compostability compliance and batch quality control as two separate but complementary parts of product assurance.

Our batch inspection programme looks at the finished liner itself.

What do we test — and what real FOGO situations are we trying to simulate?

The purpose of these tests is not to recreate every possible kitchen condition in a laboratory.

It is to create repeatable internal quality controls that reflect the types of stress a FOGO liner can experience in restaurants, cafés, hotels, commercial kitchens, food preparation areas and waste rooms.

What did our current internal batch verification show?

Our current inspection programme covers Compostar’s current wholesale liner sizes: 10L, 18L, 36L, 80L, 120L and 240L.

The wet-use verification was conducted for 24 hours at 23 ± 2°C, with three samples per size. The functional load programme also includes controlled holding and handling checks.

These are Compostar internal batch-quality verification conditions. They are not independent laboratory limit claims, not a replacement for compostability certification, and should not be interpreted as a universal load rating for every possible waste type, bin setup or handling condition.

Their purpose is to help Compostar monitor manufacturing consistency and finished-product performance across ongoing production batches.

Why have we chosen relatively substantial film thicknesses?

Film thickness is one of the most visible differences between compostable liners, but it is often presented simply as a specification number.

For commercial FOGO use, we think it deserves more explanation.

A liner used for dry office rubbish and a liner used behind a restaurant kitchen can face very different conditions. Wet food waste adds weight. Bones and stalks create concentrated pressure. Liquids can expose pinholes or weak seals. A full liner may also be pulled against the edge of a bin before being lifted or transferred.

This means the film needs sufficient mechanical margin for tension, tearing, puncture and handling loads.

Thickness is not the only factor determining performance — polymer formulation, film orientation, sealing conditions, bag geometry and manufacturing quality also matter.

However, under comparable material and manufacturing conditions, additional film thickness provides a larger material cross-section to carry load and can increase the absolute force required to stretch, tear or puncture the film.

That is why we describe thickness as a key contributor to mechanical durability, rather than claiming that thickness alone determines bag strength.

How do Compostar’s current batch measurements support commercial-use design?

Publicly available specifications from selected compostable liners sold in the Australian market show lower published film gauges across several comparable commercial sizes.

Sources & Methodology

The comparison above is based on publicly available product specifications from selected compostable liners sold in Australia. It is not presented as a complete market average. Product specifications were accessed in August 2026.

Published specification sources:

- 36L compostable liner 
- 80L compostable liner
- 120L compostable liner 
- 240L compostable liner

They do, however, illustrate an intentional part of Compostar's product design: particularly in our larger commercial sizes, we have chosen to maintain additional film gauge rather than simply minimise material thickness.

But thickness is only the beginning of the story.

We then test the finished bag to determine whether that material margin translates into useful performance.

What does scientific research say about film thickness and mechanical performance?

The relationship between film thickness and mechanical performance is supported by peer-reviewed research on compostable packaging materials.

Researchers including Rapisarda et al., from organisations including Italy’s CNR Institute for Polymers, Composites and Biomaterials and CNR Institute for BioEconomy, published a study in Materials titled:

Compostable Polylactide and Cellulose Based Packaging for Fresh-Cut Cherry Tomatoes: Performance Evaluation and Influence of Sterilization Treatment

The study specifically examined compostable bio-based packaging films and evaluated both tensile properties and puncture performance.

The researchers reported that penetration force is related to tensile properties, elasticity and film thickness, indicating that film thickness is one of the factors influencing puncture performance.

This is particularly relevant to compostable FOGO bin liners.

In commercial kitchens, restaurants, cafés and other back-of-house food preparation environments, liners may come into contact with bones, fruit stalks, hard food scraps and other concentrated loads that press against the film.

These conditions can create localised stress that may lead to puncture, tearing or eventual bag failure.

For this reason, Compostar does not rely on film thickness alone. We combine relatively substantial film gauges with finished-bag testing, including tensile performance, tear resistance, functional load testing and leakage verification.

Our approach is therefore based on a simple principle:

Film thickness provides mechanical margin. Finished-product testing verifies whether that margin translates into real-world FOGO liner performance.

Research Source

Rapisarda, M. et al. (2020). Compostable Polylactide and Cellulose Based Packaging for Fresh-Cut Cherry Tomatoes: Performance Evaluation and Influence of Sterilization Treatment. Materials, 13(15), 3432.

Full paper: PubMed Central (PMC)
DOI: 10.3390/ma13153432

Thicker by design. Tested for performance.

Our quality process connects the two:

Film thickness → tensile and tear testing → functional load verification → wet food-waste simulation → bottom-seal inspection → leakage testing.

For example, our current 80L batch measured 26.4 μm. Instead of stopping at the statement that the film is thicker than many publicly listed 22–23 μm compostable 80L liners, we also subjected the finished liner to a 13 kg functional load test and a 24-hour wet FOGO simulation.

The current 240L batch measured 26.4 μm and was likewise tested at a 15 kg internal verification load, followed by wet-use, leakage and bottom-seal checks.

This is the difference between a specification and a quality programme.

Why ongoing batch testing matters for commercial customers

A restaurant group, hotel, school, club, food manufacturer or waste contractor may buy the same liner repeatedly over months or years.

For these customers, one strong sample is not enough.

The real quality question is whether Batch 1, Batch 20 and Batch 100 remain consistent.

That is why Compostar intends to continue recording batch-level data including thickness, dimensions, tensile properties, tear resistance, functional load performance, wet-use performance, leakage resistance, bottom-seal integrity, bag weight and material consistency.

As our production history grows, this allows us to build a performance baseline rather than relying on isolated product claims.

The objective is not simply to say:

“Our compostable bags are strong.”

It is to be able to demonstrate:

how we test them, what real-use risk each test represents, what each production batch measured, and whether performance remains consistent over time.

A better way to think about compostable FOGO liner quality

For commercial FOGO applications, we believe three questions should be considered together.

Is the liner made within the relevant certified compostable formulation?

Is it designed with enough material and structural margin for its intended use?

Has the finished production batch actually been checked for consistency and functional performance?

Compostar's batch quality programme is being developed around all three.

Certified for compostability.
Thicker by design.
Tested for real-world performance.
Verified batch by batch.

For businesses managing wet food waste in commercial kitchens, cafés, restaurants, hotels, schools, clubs and other FOGO environments, that is the standard of consistency we intend to keep building.

Frequently Asked Questions

Does a thicker compostable bin liner always mean a stronger bag?

Not automatically. Material formulation, film orientation, sealing quality, bag design and manufacturing conditions all influence strength. However, under comparable material and manufacturing conditions, film thickness is an important contributor to the absolute force a film can withstand and to its resistance to stretching, tearing and puncture. This is why Compostar combines thickness control with finished-product performance testing.

Why does Compostar batch-test liners that are already compostability certified?

Compostability certification and batch quality testing serve different purposes. Certification addresses compostability requirements for the approved formulation and construction. Batch QC checks whether the finished production lot remains dimensionally and mechanically consistent and performs as intended under Compostar's internal FOGO-use verification conditions.

Why test compostable liners with wet food waste?

Commercial FOGO liners can contain fruit and vegetable scraps, leftovers, coffee grounds, sauces and other moisture-rich organic waste. Moisture, sustained weight, sharp food edges and lifting can place different stresses on a liner than dry household rubbish. Wet-use, leakage, bottom-seal and load testing therefore provide useful information about the finished bag's intended commercial-use performance.

Will Compostar continue batch quality testing?

Yes. Batch quality testing is intended to remain an ongoing part of Compostar’s quality-control programme rather than a one-time product demonstration. As additional production batches are completed, continued testing will allow us to monitor consistency over time and build a more meaningful historical performance record for our compostable FOGO liners.

Research reference

Rapisarda, M., Patanè, C., Pellegrino, A., Malvuccio, A., Rizzo, V., Muratore, G. & Rizzarelli, P. (2020). Compostable Polylactide and Cellulose Based Packaging for Fresh-Cut Cherry Tomatoes: Performance Evaluation and Influence of Sterilization Treatment. Materials, 13(15), 3432. DOI: 10.3390/ma13153432.