Which materials are used for commercial kitchen equipment
A commercial kitchen is built on three materials: stainless steel, aluminium and food-grade plastic. Each has its own niche, defined by physical properties, cost and sanitary standards. The choice of material affects both the service life of the equipment and food safety.
Stainless steel dominates wherever there is contact with raw food, high temperatures or aggressive cleaning. Aluminium is valued for its thermal conductivity, and plastic for its light weight and impact resistance in support areas.
- Stainless steel (usually grade AISI 304) is used for work tables, sinks, shelving and the housings of cooking equipment. Its main advantage is a continuous non-porous surface that does not absorb odours or react with acids.
- Aluminium is most often used for baking sheets, frying pans and some roasting tins. It spreads heat quickly and evenly but needs careful washing, as alkalis and acidic marinades gradually break down its oxide layer.
- Food-grade plastic (polyethylene or polypropylene) is used for cutting boards, storage containers, spatulas and ladles. It does not break or scratch softer metal surfaces, but over time it develops knife cuts that become breeding grounds for bacteria.
- Combination products, such as aluminium pots and pans with a non-stick coating, combine the thermal conductivity of metal with the practicality of a coated surface. They are used for delicate foods, although their service life is limited by wear of the coating.
Why stainless steel wins on hygiene
Stainless steel has a non-porous surface that does not absorb moisture, grease or food residue. Unlike plastic, which develops micro-cracks over time, steel gives bacteria nowhere to multiply. After washing, the surface dries completely, with no hidden damp spots.
Resistance to aggressive chemicals means you can use professional alkaline and acidic detergents without risk of damaging the surface. Aluminium darkens and loses its protective layer on contact with them, while plastic turns dull and rough. Steel withstands regular sanitising with hot water and steam without any change.
As a result, you spend less time scrubbing off stubborn soiling, and the surface does not hold on to odours. A smooth surface does not trap food particles, so even after a busy shift a steel work table cleans faster than a plastic or aluminium one.
How stainless steel meets HACCP requirements
Food-grade stainless steel meets the key principles of HACCP, while aluminium and plastic create the risks auditors flag most often. The system's main requirement is that food-contact surfaces must not be a source of physical, chemical or biological contamination. Stainless steel does not react with acids, does not release foreign substances and withstands cleaning agents that damage aluminium and plastic.
During an audit, inspectors check whether detergent residue or bacteria can be detected on surfaces. Stainless steel passes, while the alternatives often do not. Here is why:
- Aluminium darkens and loses its smoothness when exposed to acidic detergents. Bacteria build up in micro-cracks and cannot be removed by standard washing.
- Plastic surfaces get scratched over time, and biofilms remain in the scratches. No sanitiser guarantees complete cleaning of rough plastic.
- AISI 304 stainless steel has no pores, does not oxidise and withstands daily washing with hot water and disinfectants without surface damage.
- The smooth, polished surface of steel makes it possible to check cleanliness visually. An auditor can see at once whether all grease and food residue has been removed.
- Unlike aluminium, steel does not leave traces of metal in food, which satisfies the requirement for no chemical contamination.
- Welded seams on steel equipment are ground and polished to the smoothness of the base sheet, eliminating places where dirt can collect at joints.
Which lasts longer: stainless steel, aluminium or plastic
Stainless steel lasts the longest because it withstands mechanical damage, heat and chemicals. Aluminium and plastic lose on each of these counts, which becomes noticeable after just a year of heavy use.
When hit by a pot or a dropped tray, a plastic housing cracks and an aluminium edge bends out of shape. AISI 304 stainless steel takes such loads without deforming. When washed with hot water and aggressive detergents, plastic turns dull and absorbs odours and aluminium oxidises and darkens, while steel keeps its surface unchanged. Near cooking equipment, where temperatures reach 200 °C, plastic melts and aluminium expands and eventually warps. Steel withstands these conditions for years without changing shape.
Food-grade stainless steel products last 10 to 15 years or more. Aluminium sheets and tins need replacing after 3 to 5 years, and plastic containers and crates rarely last more than two years in a professional environment.
When aluminium or plastic still make sense
Aluminium and plastic do not replace stainless steel where there is heat, acidic food or intensive washing, but in certain areas their properties are more practical. The lighter weight of aluminium reduces strain on staff when carrying large baking trays, and the low price of food-grade plastic makes it affordable to keep a spare stock of utensils. The main rule: these materials only work where there is no contact with hot surfaces and no daily mechanical abrasion.
Here are specific situations where aluminium or plastic is the better choice:
- Cutting boards. Colour-coded polyethylene boards under the HACCP system prevent cross-contamination and cost a fraction of steel alternatives. They do not blunt knives and can go through a dishwasher at up to 85 °C.
- Food pans for cold products. NSF-marked plastic containers are suitable for storing cut vegetables, sauces and marinades in cold rooms. They are lighter than steel, do not break when dropped and do not oxidise from acids the way aluminium does.
- Aluminium baking sheets. Aluminium conducts heat many times better than stainless steel, so baked goods cook more evenly. For bakeries and pastry shops they are the main working tool, despite being less scratch-resistant.
- Temporary solutions during refits. When the main steel equipment is being replaced or new tables are on order, plastic worktops or aluminium inserts let the kitchen keep working without downtime. They are removed once the permanent fit-out is restored.
- Small hand tools. Scrapers, spatulas and measuring spoons made of heat-resistant plastic are safe for non-stick coatings and do not scratch steel surfaces. Their low cost means you can replace the set every quarter at the first signs of wear.
- Transport trolleys and containers. Aluminium trolleys weigh 40 to 50% less than steel ones, which matters when loaded racks are moved between prep areas every day. Plastic crates for internal logistics do not rust from moisture and are easy to wash.
In all of these cases, the material is chosen for a specific task, not out of a wish to save money across the board. When steel, aluminium and plastic are each used in their proper place, the kitchen becomes more reliable and convenient than if you tried to make everything from one metal.
How to choose the right stainless steel grade for your kitchen
In commercial equipment specifications you will most often see two grades: AISI 304 and AISI 316. AISI 304 is the standard for most kitchen surfaces, sinks and general equipment. It contains 18% chromium and 8% nickel, which gives excellent resistance to corrosion from water, steam and food acids in daily use.
AISI 316 costs noticeably more because of the 2 to 3% molybdenum added. This element increases resistance to aggressive chemicals, especially brine and chlorine-based detergents. This steel is justified in fish processing areas, on outdoor lines near the sea, or where sanitation involves regular use of strong disinfectants.
When checking a specification, look not only at the steel grade but also at the metal thickness and surface finish. For work tables and shelves, look for metal at least 1.2 mm thick. The surface should be brushed, with a fine texture that hides scratches during use. Avoid mirror polish on horizontal surfaces: it quickly loses its look from knives and cookware. Welded seams should be continuous, without pores or recesses, so that dirt cannot collect at the joints.
FAQ
Can aluminium cookware be used in a commercial kitchen?
Yes, with limitations. Aluminium conducts heat well, so it is often used for frying pans and baking sheets. However, it reacts with acidic foods, darkens in dishwashers and is softer than steel, so it deforms faster. For surfaces in contact with raw food, HACCP recommends stainless steel.
Which stainless steel grade is required for food production?
The basic standard is AISI 304. It contains 18% chromium and 8% nickel, which gives enough corrosion resistance for most kitchen tasks. For aggressive environments, such as contact with marinades or very salty water, AISI 316 with added molybdenum is used.
Is buying stainless steel equipment enough to pass a HACCP inspection?
No. The material is only part of the requirements. The inspector also checks the design, such as the absence of sharp corners and seams where dirt builds up and an intact, scratch-free surface, as well as your cleaning and disinfection procedures.
How often does stainless steel equipment need replacing?
With proper care, stainless steel tables, shelving and sinks last 15 to 20 years or more. They are usually replaced not because of corrosion but because of mechanical damage or a change in kitchen layout.
