Classification of Packaging Materials: Types and Their Uses in Food Industry

Every food product you pick up from a store shelf – whether it’s a packet of biscuits, a tin of tomatoes, or a glass jar of jam – has been carefully enclosed in materials chosen for very specific reasons. The packaging around food does far more than just hold it together; it preserves freshness, prevents contamination, communicates brand information, and ensures the product survives its journey from factory to kitchen. But not all packaging materials serve the same purpose. Understanding how these materials are classified gives us a clearer picture of the roles each component plays in the vast and complex food packaging ecosystem.

The two broad categories of packaging materials 🔗

Food packaging materials are broadly divided into two categories: primary packaging materials and ancillary packaging materials. Primary packaging refers to materials that come into direct contact with the food product. These are the containers, films, foils, and bottles that physically enclose and protect the food. Because they touch the food itself, primary materials must meet strict safety and regulatory standards set by food authorities worldwide.

Ancillary packaging materials, on the other hand, are the supporting components. They don’t always touch the food directly, but they are essential for making a package functional, informative, and durable. Adhesives that bond layers together, inks that print labels, closures that seal bottles – all of these fall under ancillary materials. As the Indian Centre for Plastics in the Environment (ICPE) notes, although ancillary materials represent a smaller visible percentage of the total package, their absence or poor quality can seriously compromise a package’s performance.

Primary packaging materials are further subdivided into flexible materials and rigid materials, based on their physical properties and behaviour under stress. Let’s look at each of these in detail.

Primary packaging materials: flexible types 🔗

Flexible packaging materials are those that can bend, fold, and conform to different shapes without breaking. They are widely used in the food industry because they are lightweight, cost-effective, and versatile. The main flexible materials include cellulose-based paper, aluminium foil, plastic films, and laminates.

Cellulose-based paper 🔗

Paper is one of the oldest packaging materials and continues to be a staple in the food industry. It is derived from cellulose – a natural polymer found in plant cell walls. Several types of paper are used for food packaging, each tailored to specific needs.

Kraft paper is a strong, brown paper commonly used for multi-wall sacks that carry flour, sugar, and powdered products. Greaseproof paper has a dense fibre structure that resists oil and fat penetration, making it suitable for wrapping butter, cheese, and baked goods. Vegetable parchment is produced by treating paper with sulphuric acid, giving it wet-strength and grease resistance – ideal for wrapping fatty foods.

Modern paper-based packaging often incorporates specialised coatings or laminations to enhance moisture resistance, grease barrier properties, and heat sealability. Paper is biodegradable, recyclable, and offers excellent printability, which makes it an attractive option from both a functional and sustainability perspective.

Aluminium foil 🔗

Aluminium foil is one of the most effective barrier materials available in food packaging. It is manufactured by rolling aluminium metal into extremely thin sheets, typically ranging from 6 to 150 micrometres in thickness. According to research published in Food Reviews International, aluminium foil provides superior barrier performance against moisture, oxygen, other gases, volatile aromas, and light – generally outperforming any plastic laminate material in these functions.

This is why aluminium foil is so widely used for packaging products like tea, coffee, spices, dairy items, and ready-to-eat meals. It is non-toxic, chemically inert with most foods, and can withstand a wide temperature range. As noted by ScienceDirect, aluminium foil provides an excellent barrier to moisture, air, odour, temperature, light, and microorganisms, making it a cornerstone of modern food packaging.

Aluminium foil is also infinitely recyclable without any loss of properties, which adds a significant sustainability advantage. Its cycle energy consumption during recycling is only about 5% of the energy required for original production.

Plastic films 🔗

Plastic films have become the backbone of modern flexible packaging. These thin sheets of synthetic polymers offer a range of properties – from moisture resistance to optical clarity – depending on the type of plastic used. The most commonly used plastic films in food packaging include:

Low-density polyethylene (LDPE) is soft, flexible, and the most affordable plastic film material. It is commonly used for bread bags, grocery bags, food wraps, and as the inner sealing layer in laminated pouches. LDPE offers good moisture resistance and heat sealability, though its oxygen barrier properties are relatively weak.

High-density polyethylene (HDPE) is more rigid and stronger than LDPE. It is semi-translucent and highly resistant to chemicals. HDPE is the most widely used polyethylene film for food packaging, found in milk bottles, juice containers, cereal box liners, and retail bags.

Polypropylene (PP) has a higher melting point than polyethylene, which makes it suitable for microwaveable food containers. It is used for packaging yogurt, cream cheese containers, and snack foods. Biaxially oriented polypropylene (BOPP) is a stretched variant that offers enhanced clarity, gloss, and tensile strength, making it popular for printed snack food wrappers.

Polyethylene terephthalate (PET) is valued for its excellent mechanical properties, high transparency, and superior dimensional stability. It is the standard material for soft drink bottles, water bottles, and food-grade containers. PET does not degrade upon food contact, which makes it especially reliable for packaging applications.

Polyvinyl chloride (PVC) offers good clarity and serves as an effective barrier against oxygen and grease. It is used in cling films and blister packaging, though its usage has become more restricted in recent years due to environmental and health concerns about certain additives.

Laminates 🔗

In many cases, a single packaging material cannot provide all the properties a food product needs. This is where laminates come in. A laminate is a multi-layer structure that combines two or more different materials – such as plastic films, aluminium foil, and paper – bonded together using adhesives. Each layer contributes a specific property.

For example, a typical snack food laminate might have an outer printed plastic layer for branding and durability, a middle aluminium foil layer for barrier protection against oxygen and moisture, and an inner polyethylene layer for heat sealing. Similarly, coffee packaging often uses multi-layer structures to protect the product’s flavour and aroma over extended storage periods. Laminates are the reason many packaged foods can maintain their quality for months or even years.

Primary packaging materials: rigid types 🔗

Rigid packaging materials maintain their shape and structure under stress. They offer strong physical protection and are particularly suitable for products that require long shelf life or resistance to external pressure.

Metal containers 🔗

Metal packaging – primarily made from tinplate steel and aluminium – offers unmatched protection and shelf stability for food products. Canned foods can maintain their quality for years because metal containers provide a complete barrier against oxygen, moisture, light, and microbial contamination.

Tinplate steel cans are widely used for fruits, vegetables, fish, and meat products. They can withstand the high temperatures required during thermal sterilisation (retort processing), which is critical for shelf-stable products. Modern cans feature internal lacquer coatings or polymer linings to prevent interaction between the metal and the food, particularly with acidic products like tomatoes or citrus fruits.

Aluminium cans are lighter than steel and are predominantly used for beverages – from carbonated drinks to beer. They are also highly recyclable, making them a preferred option for environmentally conscious brands. Innovations like easy-open ends and stay-on-tab closures have significantly improved the convenience of metal packaging for consumers.

Glass bottles and jars 🔗

Glass is one of the most chemically inert packaging materials available. It does not react with food contents, which means it has zero impact on the flavour, aroma, or safety of the product inside. Glass packaging signals high quality to consumers and is especially popular in the food and beverage, cosmetics, and pharmaceutical industries.

Glass bottles and jars are used for a wide range of food products – from pickles, sauces, and jams to baby food, honey, and premium beverages. Glass provides a complete barrier against gas and moisture transmission, which helps maintain product integrity over long storage periods.

The main drawbacks of glass are its weight and fragility compared to plastic or metal alternatives. However, these are offset by its excellent recyclability – glass can be recycled indefinitely without any loss in quality or purity – and its strong consumer appeal, particularly for premium and organic product lines.

Ancillary packaging materials 🔗

While primary materials get most of the attention, ancillary materials are the unsung heroes that make a complete, functional package possible. These materials enhance the performance, appearance, and usability of the primary packaging. The key ancillary materials include adhesives, printing inks, labels, and cushioning materials.

Adhesives 🔗

Adhesives are essential for bonding different layers of packaging together. In laminated flexible packaging, for instance, adhesives hold the plastic, foil, and paper layers in a secure multi-layer structure. According to the ICPE, adhesives distribute stress more uniformly between bonded members than mechanical fasteners, making them ideal for packaging applications.

Adhesives used in food packaging are broadly classified into three types. Waterborne adhesives are the oldest and most widely used class. They include natural adhesives based on starch, casein, and animal glue, as well as synthetic emulsions like polyvinyl acetate. Hot-melt adhesives are thermoplastic compounds – most commonly based on ethylene vinyl acetate (EVA) copolymers – that set rapidly upon cooling, making them ideal for high-speed packaging lines. Solvent-borne adhesives, though declining in use due to environmental regulations, are still used for specialised applications like laminating plastic films for flexible packaging.

When adhesives are used in packages that directly contact food, they must be food-safe and must not migrate into the food product in harmful quantities.

Printing inks 🔗

Printing inks enable the communication of essential product information, branding, and nutritional details on packaging. Food-grade inks are specially formulated to resist migration through packaging materials into the food, which is a critical safety requirement.

Modern packaging inks must provide clear, durable graphics that resist fading from UV exposure, abrasion during handling, and moisture during storage. The inks used on food packaging fall into several categories based on the printing process – gravure, flexographic, offset, and digital printing each require different ink formulations optimised for their specific substrates and curing mechanisms.

Labels 🔗

Labels serve both regulatory and marketing purposes on food packages. They carry legally mandated information such as ingredients, nutritional facts, expiry dates, and batch numbers, as well as brand logos and promotional graphics.

The two major substrate materials for labels are paper and plastic films. Paper labels applied with wet glue remain the most economical and widely used option in many industries. However, plastic film labels – including shrink-sleeve and stretch labels – have been gaining popularity because of their ability to conform to complex container shapes, resist moisture, and provide 360-degree branding coverage. The choice of label adhesive is also important; pressure-sensitive adhesives, for example, must perform reliably across a range of temperatures, including freezer conditions as low as -30°C for frozen food applications.

Cushioning materials 🔗

Cushioning materials protect food products – especially fragile items like glass-packaged goods, eggs, and delicate baked products – from physical damage during handling, transportation, and storage. Common cushioning materials include bubble wrap, foam inserts, moulded pulp trays, and tissue paper.

These materials absorb shocks and vibrations that occur during transit, reducing the risk of breakage and product loss. In the food industry, moulded pulp trays (made from recycled paper fibres) are particularly popular for packaging eggs and fruits because they are biodegradable, lightweight, and cost-effective.

Why this classification matters in practice 🔗

The classification of packaging materials into primary and ancillary categories is not just an academic exercise – it has real practical significance. From a food safety perspective, primary materials face the strictest regulatory scrutiny because they directly contact the food. Standards set by bodies like the U.S. Food and Drug Administration (FDA) and the Food Safety and Standards Authority of India (FSSAI) govern what materials, additives, and migration limits are acceptable for primary food contact packaging.

Ancillary materials, while not always in direct food contact, still need to meet safety criteria – especially adhesives and inks used in laminates where migration through inner packaging layers is a concern. The classification also guides manufacturers in selecting the right combination of materials for a specific product. A highly perishable food item may require a multi-layer laminate with aluminium foil for maximum barrier protection, while a dry snack may only need a simple polypropylene film.

Understanding whether a packaging need calls for flexible or rigid primary materials – and which ancillary components will best support those materials – is fundamental to designing packages that balance protection, cost, convenience, and environmental impact.

What do you think? How do you see the growing demand for sustainable packaging influencing the way we classify and choose packaging materials in the food industry? And which type of packaging material – flexible, rigid, or a combination – do you believe offers the best balance between food safety and environmental responsibility?

References

1. https://en.wikipedia.org/wiki/Food_packaging
2. https://icpe.in/icpefoodnpackaging/pdfs/32_ancillary.pdf
3. https://pactap.com/types-of-packaging-materials/
4. https://www.tandfonline.com/doi/abs/10.1080/87559120701593830
5. https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/aluminum-foil
6. https://www.p5pkg.com/blog/types-of-plastic-food-packaging/
7. https://www.sourceful.com/blog/materials-for-packaging
8. https://www.chemicalsafetyfacts.org/health-and-safety/types-of-plastic-food-packaging-and-safety-a-close-up-look/
9. https://www.bizongo.com/blog/different-types-of-packaging-products
10. https://www.fda.gov/