How F&B manufacturers should specify sustainable food packaging

By Junso Zhang, Founder of Bioleader®

 

Walk through a food packaging exhibition and many products appear easy to identify.

 

A brown bowl looks like kraft paper. A white takeaway container looks like molded fiber. A crystal-clear cold cup looks like conventional plastic. A paper cup appears to be, simply, paper.

 

In practice, none of those visual judgments tells a buyer enough.

 

Two paper bowls that look almost identical can use different paper grades, different forming structures and completely different barrier coatings. Two clear cups may be PET, PP or PLA, even though an inexperienced buyer could struggle to distinguish them by appearance alone. A molded-fiber tray may be made from sugarcane bagasse, another plant-fiber blend or a formulation with different oil- and water-resistance treatments.

 

This matters because food packaging is not just a material choice. It is a performance system involving the substrate, barrier layer, manufacturing process, food type, temperature, contact time, logistics and destination-market requirements.

 

For food and beverage manufacturers, specifying the package correctly requires looking beneath the surface.

 

 

(Photo courtesy:  Bioleader®)

 

 

 

“Paper Packaging” is not one material

The word paper covers a surprisingly wide range of food packaging structures.

 

A basic single-wall paper cup may consist of paperboard plus a thin internal barrier layer. A hot-drink cup may use a double-wall or ripple-wall structure to improve insulation. A paper soup bowl may use heavier board and a different coating weight because prolonged contact with hot liquid creates a more demanding application.

 

Kraft paper and white paperboard may also appear different visually but still require similar questions about fiber quality, coating, printing, sealing and food-contact performance.

 

Then there is molded fiber, which is often grouped together with paper packaging even though its manufacturing process is fundamentally different.

 

Sugarcane bagasse packaging, for example, is generally produced by pulping plant fiber and molding it into shape under controlled forming and drying conditions. Its strength, surface quality and resistance to grease and moisture can be influenced by fiber formulation, molding pressure, product thickness, additives and barrier treatment.

 

So a buyer asking only, “Is this paper?” has not yet asked the questions that determine whether the package will actually work.

A more useful set of questions is:

●     What is the primary substrate?

●     Is the product converted paperboard or molded fiber?

●     What is the basis weight or finished thickness?

●     Is it single-wall, double-wall or another structural design?

●     What barrier system is applied?

●     What food, temperature and contact time was it designed for?

●     What test data supports those conditions?

 

These details are often more meaningful than the broad material category printed in a catalogue.

 

Clear cups can look almost identical but behave very differently

Transparent beverage cups illustrate the same problem from another direction.

 

PET, PP and PLA cups can all be manufactured with a clear appearance, yet their material properties, intended applications and end-of-life pathways are not the same.

 

PET is widely used for cold beverage cups and is familiar to conventional plastics recycling systems in many markets. PP is used across numerous food-contact applications and has different thermal and mechanical characteristics. PLA is a biobased polyester commonly used for cold-drink applications when compostable packaging is being specified.

 

The practical mistake is to assume that transparency tells you which polymer you are holding.

 

It usually does not.

 

For procurement and quality-control teams, polymer identity should therefore come from a material specification, supplier declaration and, when necessary, analytical verification—not from bending, tapping or visually comparing a cup.

 

If material identity is commercially or legally important, laboratory methods such as FTIR or DSC can be used to verify polymer type rather than relying on appearance.

 

The next question is equally important: what will actually be put into the cup?

 

A clear cold cup designed for iced tea has a very different duty cycle from packaging exposed to hot filling, reheating or long-duration contact with oily food.

 

The U.S. FDA itself distinguishes food-contact applications by both food type and conditions of use, including aqueous foods, oily foods, beverages, hot filling, refrigerated storage, frozen storage and higher-temperature applications. FDA guidance on food types and conditions of use for food-contact substances

 

That is a useful principle even outside the U.S.: packaging should be selected around its real application rather than its appearance.

 

The hidden part of paper packaging: The barrier layer

One of the most frequently overlooked parts of paper food packaging is the layer the buyer can barely see.

 

Paperboard alone does not provide the liquid, grease and sealing performance required for many cups and bowls. A barrier therefore has to be created between the paper and the food.

 

Depending on the product and specification, that may involve:

●     PE coating

●     PLA coating

●     aqueous or water-based barrier coating

●     other functional coating systems

 

From the outside, the finished bowls can look almost identical.

 

Their manufacturing behavior and end-of-life characteristics may not be.

 

The barrier influences more than leakage. It can affect heat sealing, converting speed, grease resistance, moisture absorption, repulpability, compostability claims and compatibility with downstream waste systems.

 

This is why “paper bowl” is not a complete material specification.

A technically stronger purchasing question is: What is the complete packaging structure, including the food-contact barrier? The answer should ideally identify not only the main substrate but also the functional layer that makes the finished package perform.

 

A factory lesson: The food exposes weaknesses that appearance does not

This difference becomes clearer during real product development.

 

In one export project we worked on, a customer required a compartmented molded-fiber food tray for meals containing both hot sauce and other foods with very different moisture levels.

 

Visually, several samples looked acceptable. Dry handling tests also showed little difference.

 

The demanding part came when the package was tested closer to its actual service conditions: hot, oily sauce, liquid contact, holding time and a tilted container.

 

At that point, small differences in fiber formation, compartment geometry and barrier performance became much more obvious. The question was no longer whether the tray “looked like good bagasse.” The important question was whether liquid would migrate, whether the compartments remained isolated and whether the structure retained adequate strength throughout the intended holding period.

 

Experiences like this are common in our packaging development work at Bioleader®.

 

They have also changed the way we discuss materials with buyers. A sample should not be approved because it looks environmentally preferable or because its material name sounds suitable. It should be tested with the food, temperature and handling conditions it will actually encounter.

 

Start with the food, then work backward to the material

For F&B manufacturers, a more reliable specification process starts with the application.

 

Before choosing the material, define:

Food type. Is the product dry, aqueous, acidic, fatty, oily or a combination of these?

Temperature. Will the package be used for chilled food, room-temperature filling, hot filling or reheating?

Contact time. Five minutes at a takeaway counter is different from 45 minutes in delivery and very different from several days of refrigerated storage.

Mechanical load. Will containers be stacked? Will the lid carry weight? Will the package experience vibration during transport?

Moisture and grease exposure. Soup, noodles, curry, fried food and salad all place different demands on a packaging structure.

Closure system. Cup and lid compatibility can be just as important as cup material. Small dimensional variations can create leakage or lid-release problems.

 

Only after these questions are defined should material selection be finalized, and this reverses a common procurement habit.

Instead of saying, “We want a compostable bowl—what do you have?”, the more useful brief is: “We need a container for this food, at this temperature, for this holding time, sold in this market. Which structures meet those conditions?” This statement produces a much more meaningful technical discussion.

 

Food-contact compliance applies to the finished structure

Material selection cannot be separated from food-contact compliance either.

 

The European Commission defines food-contact materials broadly to include packaging, containers, processing equipment, kitchenware and other materials that can transfer constituents to food. EU food-contact requirements apply to the finished material or article placed on the market, not merely to the marketing name of the primary substrate. European Commission guidance on Food Contact Materials

 

That distinction matters for coated and composite packaging.

 

A paper bowl may be mostly fiber, but the coating, printing inks, adhesives and other components still form part of the finished food-contact article. A clear cup may be described simply as PET or PLA, but its complete compliance assessment can also involve additives, colorants, printing and intended conditions of use.

 

For procurement teams, documentation should therefore match the actual finished structure and intended use, rather than relying on a generic statement that the base material is “food grade.”

 

Certification is not the same as service performance

Another common mistake is to treat certification as proof of every aspect of packaging performance.

 

Certification can provide valuable third-party evidence against a defined standard. But certification does not replace application testing.

 

A compostability certificate, for example, does not automatically demonstrate that a container will hold oily curry for an hour without softening. A food-contact test does not necessarily prove that a lid will remain attached during delivery. A recyclability assessment does not guarantee that a local municipality actually collects the package.

 

These are different questions. For a commercial package, buyers often need to evaluate at least three separate layers:

Compliance: Is the packaging legally suitable for the intended market and food-contact use?

Performance: Does it function with the actual food, temperature, handling and storage conditions?

End of life: Is the intended recycling, composting or disposal pathway realistically available where the packaging will be used?

 

Confusing these three layers is one reason sustainability claims can become misleading.

 

“Recyclable” does not automatically mean recycled

End-of-life claims deserve particular caution.

 

A package may be technically compatible with a recycling process, yet still fail to be recycled because it is not collected locally, cannot be reliably sorted, is rejected by the relevant recycler or lacks a viable end market.

 

We examine this distinction in more detail in our technical article, Why “Technically Recyclable” Is Not the Same as “Recycled in Practice”.

 

This principle applies to several common foodservice formats.

 

A paper cup can contain recoverable fiber but still depend on whether local collection programs and paper mills accept that cup structure. PET may have an established recycling pathway in one country or city but very different collection access in another. Compostable packaging may meet a recognized technical standard while still lacking access to an industrial composting stream that accepts foodservice items.

 

European packaging policy increasingly reflects this system-level thinking. The EU Packaging and Packaging Waste Regulation, Regulation (EU) 2025/40, treats packaging design and actual recycling infrastructure as connected but distinct parts of the transition toward more circular packaging. Regulation (EU) 2025/40 on packaging and packaging waste

 

For exporters, this makes the destination market part of the packaging specification.

 

The destination market can change the “right” packaging

There is no universally correct sustainable food package.

 

A structure suitable for a domestic takeaway application may be inappropriate for an export product. Requirements can change because of food-contact rules, restrictions on particular substances, labeling requirements, recycling systems, composting infrastructure or single-use packaging legislation.

 

Logistics can also alter performance.

 

A food container may be manufactured in Asia, packed into cartons, transported through high humidity, spend several weeks at sea, pass through a distribution warehouse and only then reach the food manufacturer.

 

That journey matters.

 

Paper and molded-fiber products can respond to moisture. Carton compression can affect rim dimensions. Cup and lid tolerances can become important during long supply chains. Printed surfaces and barrier layers must remain stable through storage and handling.

 

For imported food packaging, therefore, the correct question is not simply: “Does the sample work today?”

It is: “Will this specification still work after manufacturing, packing, shipping, storage and actual food use in the destination market?”

 

A practical specification checklist for F&B buyers

Before approving a foodservice package, an F&B manufacturer or procurement team should be able to answer the following:

 

Specification Area	Questions to Confirm
Primary material	Paperboard, kraft, molded fiber, PET, PP, PLA or another material?
Complete structure	Are there coatings, laminations, additives, inks or adhesives that affect performance or compliance?
Food type	Dry, wet, acidic, oily, fatty or mixed food?
Temperature	Cold, ambient, hot fill, hot food, reheating or freezing?
Contact time	Minutes, hours or extended storage?
Barrier requirement	Water, oil, grease, oxygen or other resistance needed?
Mechanical performance	Stacking, lid retention, delivery vibration or compartment isolation required?
Food contact compliance	Does documentation cover the actual material structure and intended conditions of use?
Environmental claim	What evidence supports recyclable, compostable or other claims?
Destination market	What local legal, labeling and waste-system requirements apply?
Validation	Has the final package been tested with the real food and service conditions?

 

None of these questions is particularly complicated.

The difficulty comes when they are replaced by a single question such as “Is it paper?”, “Is it biodegradable?” or “Is it recyclable?”

Those words describe only part of the package.

 

Beyond the material name

Sustainable packaging decisions are becoming more technical, not less.

 

As manufacturers move from conventional plastics toward paper, molded fiber, bioplastics and new barrier technologies, the number of possible material combinations is increasing. At same time, regulators and customers are asking for stronger evidence behind environmental claims.

 

That makes accurate specification increasingly important.

 

A clear PLA cup and a PET cup may look almost identical. Two paper bowls may hide completely different barrier technologies. Two molded-fiber trays may use similar plant fibers but perform differently with hot oil, moisture or long delivery times.

 

The most useful question is therefore no longer: “What material is this package made from?” 

 

It is: “What is the complete packaging structure, how was it manufactured, what conditions was it designed for, and what happens to it in the market where it will actually be used?”

 

That is the level at which material choice becomes a reliable packaging specification rather than a sustainability claim.

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*About the Author

Junso Zhang is founder of Bioleader®, a China-based manufacturer of molded-fiber, paper-based and compostable foodservice packaging. His work involves international packaging projects covering material selection, product testing, food-contact requirements, customization and export applications for foodservice and F&B customers.