Equipment as contamination control
Everywhere else in this catalog, equipment holds things. In a cleanroom it also either helps or hurts the thing the room exists to do.
A shelf in a warehouse has one job. The same shelf in an ISO 7 buffer room has three: hold the load, avoid generating particles itself, and not obstruct the airflow that is scrubbing the room. A design that is excellent at the first and poor at the other two is a liability, and it will not be obvious from a product photo.
That changes how you specify. Three questions come before capacity and price:
Question one
Does it shed?
Painted steel chips. Galvanizing flakes. Wood is porous. Rough welds trap and release. Materials that are unremarkable elsewhere are disqualifying here.
Question two
Does it block airflow?
Cleanrooms work by moving filtered air downward through the space. Solid horizontal surfaces interrupt that. Section four is the counterintuitive part.
Question three
Can it survive your cleaning chemistry?
Equipment gets wiped daily with something aggressive. What that something is decides your stainless grade. Section five.
Get those three right and the rest of the specification is ordinary material handling. Get them wrong and you have bought something that quietly degrades the environment you are paying to maintain.
If you already know your ISO class, skip to the gowning workflow, which is the fastest way to work out what you actually need to buy. Section four is worth reading regardless, because it contradicts what most buyers assume.
ISO classes, and what they mean for you
You do not need to be an expert in the standard. You do need to know your number, because it sets how strict everything else gets.
ISO 14644-1 classifies cleanrooms by the concentration of airborne particles, on a scale from ISO 1 (cleanest) to ISO 9. Lower is cleaner. The class is defined by how many particles of a given size are permitted per cubic metre of air.
| Class | Particles ≥ 0.5 µm per m³ | Particles ≥ 5.0 µm per m³ | Typically used for |
|---|---|---|---|
| ISO 5 | 3,520 | 29 | Inside primary engineering controls: laminar flow hoods, biological safety cabinets |
| ISO 7 | 352,000 | 2,930 | Buffer rooms for sterile compounding. Minimum 30 air changes per hour |
| ISO 8 | 3,520,000 | 29,300 | Ante rooms and gowning areas. Minimum 20 air changes per hour for non-hazardous |
Note the scale. Each step is a factor of ten, so ISO 5 is a hundred times cleaner than ISO 7. That is why equipment tolerated in an ante room may be unacceptable a door away.
The old class names you will still hear
Many people in this industry still speak in the language of the withdrawn US Federal Standard 209E, which named classes by particles per cubic foot. The rough mapping:
| ISO 14644-1 | Legacy FS209E name |
|---|---|
| ISO 5 | Class 100 |
| ISO 6 | Class 1,000 |
| ISO 7 | Class 10,000 |
| ISO 8 | Class 100,000 |
If a colleague or a supplier says "Class 100,000," they mean ISO 8. The equivalence is approximate because the two standards measure at different particle sizes and in different units, so use the ISO class on any formal document.
The room's classification comes from its air handling, filtration, air change rate, pressure cascade and the discipline of the people in it. Buying cleanroom-grade shelving does not raise your class, and buying the wrong shelving can help you lose it. Equipment protects a classification that the room already achieves; it does not create one.
The gowning workflow buys the equipment
This is the fastest way to build an accurate equipment list: walk the sequence a person follows getting into your cleanroom.
Nearly every product in this category exists to support one step of the gowning procedure. Standard gowning runs roughly in this order, and the guiding rule is that you work top to bottom and never let a clean surface touch a dirty one:
What this tells you to buy
Lay your gowning room out in the order above and the equipment list writes itself: lockers, shoe rack, crossover bench, hand wash station, garment storage, glove and consumable dispensers, mirror, waste. Position each at the step where it is used, and the layout enforces the procedure rather than relying on people to remember it.
The single most important item is the crossover bench, because it is the only piece of equipment that physically makes the clean and dirty zones separate. A gowning room without a clear line of demarcation is one where the procedure depends entirely on discipline.
If your SOP says top to bottom, storage should be arranged top to bottom. If hand washing comes first, the sink goes at the entrance. Furniture that fights the written procedure produces deviations, and the deviations get blamed on people rather than on the layout.
Why open shelving often beats solid
The one piece of cleanroom equipment logic that reverses normal warehouse thinking.
In an ordinary stockroom, solid shelves are the premium option. They contain small parts, keep dust off the items below, and look tidier. In a cleanroom that reasoning inverts.
Cleanrooms work by laminar airflow: filtered air enters through the ceiling and moves downward in a smooth, unidirectional sheet, carrying particles down and out through low-level returns. It is a continuous washing action, and it only works if the air can actually get from ceiling to floor.
A solid shelf does two unhelpful things to that. It interrupts the downward flow, creating turbulence and dead zones where air stagnates. And it becomes a horizontal collection surface where particles settle out and accumulate until something disturbs them.
Open wire and perforated shelving avoids both. Air passes through, and particles fall through rather than gathering. This is why cleanroom garment cabinets use perforated shelves to support laminar airflow and let particles and debris fall through, and why wall-mounted garment racks use an open wire design to promote laminar airflow. It is also why gowning benches are offered with perforated tops, and why that option exists specifically to support airflow requirements in controlled environments.
| Type | Airflow | Particle behaviour | Use when |
|---|---|---|---|
| Open wire | Best | Particles fall through, nothing accumulates | The default in most cleanrooms. Garment storage, general supplies. |
| Perforated | Good | Airflow through, some support for small items | Gowning benches, garment cabinet shelves. A middle ground. |
| Solid | Blocks | Collection surface; needs wiping on a schedule | Only where you must contain spills, liquids or very small parts. Accept the cleaning burden. |
Open shelving is better for the room and worse for containment. If you genuinely need to stop small items falling through, use solid or a shelf mat and put the cleaning of that horizontal surface into your written cleaning schedule. What you should not do is choose solid by default because it feels more finished.
304, 316 and electropolish
Three specs, and the deciding factor is not what most people assume.
The grade is chosen by your cleaning chemistry
Buyers often treat 316 as simply "better stainless" and specify it when budget allows. The real question is narrower and more useful: what do you wipe the equipment down with?
Type 304
The cleanroom default
Good corrosion resistance, reasonable chemical resistance for most applications, easy to disinfect, wipe down and sterilise. Sufficient where cleaning is alcohol-based. This is what most cleanroom furniture is built from, including gowning benches.
Type 316
For aggressive chemistry
Added molybdenum gives markedly better resistance to chlorides. Specify it where cleaning is bleach-based, and in salt-laden or otherwise chloride-heavy environments. Bleach on 304, repeatedly, causes pitting.
So the specification conversation is short: tell your supplier what your cleaning SOP calls for. If there is any bleach or hypochlorite in it, budget for 316 on the surfaces that get wiped.
Electropolishing
An electrochemical process that removes a thin surface layer, leaving a smoother, brighter, more corrosion-resistant finish. In cleanroom terms the benefit is that a smoother surface has fewer microscopic crevices for contaminants to lodge in, which makes it easier to clean and harder to contaminate. It is available as an option on cleanroom furniture and is worth the money in pharmaceutical and sterile applications.
Construction details that matter more than they look
- Radiused edges. Cleanroom furniture is manufactured with rounded edges specifically to eliminate crevices that trap particles. Square corners are cleaning problems.
- Continuous welds, ground smooth. A stitched or rough weld is a particle trap and a corrosion initiation site.
- Gauge. Cleanroom gowning benches are commonly built with 14-gauge tops, with reinforced underside channels for rigidity.
- Floor mounting. Flanged foot plates let benches bolt to the floor, which prevents movement and removes the gap-and-shuffle that comes with free-standing furniture.
- No painted or galvanised surfaces anywhere in the controlled space. Paint chips and zinc flakes.
When polymer beats stainless
Stainless is the reflex answer. It is not always the right one.
Industrial polymer shelving systems were designed for exactly these environments, and in several respects they outperform stainless:
- They cannot corrode. Not "resist corrosion." Cannot. In persistently wet, humid or chemically aggressive rooms, that is a real distinction, because even good stainless eventually complains at fasteners, welds and contact points.
- Broad chemical resistance. Polypropylene and similar polymers tolerate a wide chemical range without pitting.
- Antimicrobial options. Polymer shelving is commonly available with an antimicrobial additive built into the material, which inhibits bacterial growth on the surface between cleanings.
- Removable components. Many polymer systems let you take individual shelf mats off and run them through a dishwasher or autoclave, which is a genuinely different cleaning proposition from wiping a fixed stainless shelf in place.
- Lighter. Easier to reconfigure, and easier on the person doing it.
Stainless still wins where you need maximum load capacity, high temperature tolerance, or where a validated process or customer specification names stainless. And a stainless work surface takes abuse a polymer one will not.
| Choose polymer when | Choose stainless when |
|---|---|
| Wet, humid or washdown conditions are constant | Loads are heavy or concentrated |
| Cleaning chemistry is aggressive or varied | Temperatures are high, or autoclaving whole units |
| Antimicrobial surface is valuable to you | A validated process or customer spec names stainless |
| Shelves will be removed and washed separately | The surface is a work surface taking real abuse |
| Staff reconfigure the room regularly | You need it bolted down and permanent |
A common and sensible arrangement is both: polymer for storage shelving and mobile carts where corrosion and cleaning dominate, stainless for benches, gowning furniture and anything structural.
Carts and mobility
A cart is the most mobile particle source in the room. Specify it accordingly.
Everything in our carts and trucks guide about caster sizing still applies, and a cleanroom adds requirements on top:
- Non-shedding wheels. Wheels abrade against the floor by design. In a controlled environment the compound matters, and you want non-marking materials that do not leave a track or generate debris.
- Sealed precision bearings. Two reasons here rather than one: they roll better, and a sealed bearing does not emit lubricant or collect the particulate that an open bearing does.
- Smooth, cleanable frames. Tube frames with sealed ends rather than open tube, so there is no interior cavity to harbour contamination.
- Wire, polymer or stainless deck, chosen on the same logic as section four. Open decks for airflow, solid where you must contain.
- Quiet operation matters more than you would expect, because cleanroom staff are often working close together in a confined space for long periods.
The available formats mirror the general cart category: two and three shelf utility carts, four shelf stock carts, transfer and platform carts, and mobile security units where materials in transit need controlled access. The difference is in the material and detailing, not the concept.
A cart that moves between an ISO 8 ante room and an ISO 7 buffer room is a contamination pathway. Either dedicate carts to a single zone, or build a documented wipe-down at the transition into your procedure. This is a workflow decision, and it is much cheaper to make it before you buy than to discover it during an audit.
Benches, seating and work surfaces
Where people spend the day, and where ergonomics and contamination control have to coexist.
Lab and cleanroom benches
Stainless work surfaces with the construction detailing from section five: radiused edges, smooth continuous welds, no paint. Consider whether you need an open under-frame, which is easier to clean under and lets air move, or shelving underneath, which stores more and creates more surfaces.
Gowning benches
Covered in section three as a workflow item, but worth restating as a product. Type 304 stainless, 14-gauge tops, solid or perforated, reinforced underside channels, industrial-grade legs and flanged foot plates for bolting to the floor. Electropolished finishes are available. Perforated tops are the airflow-friendly option; solid tops are easier to sanitise and suit standard gowning workflows.
Bolting to the floor is not a detail. A gowning bench that can be moved is a line of demarcation that can be moved.
Work stands
Stainless two and three shelf stands for equipment support and staging. Simple products, and the same material rules apply.
Seating
Cleanroom seating is a specific product category, not an office chair in a clean room. What separates it: non-shedding upholstery or moulded surfaces, cleanable seams, appropriate casters or glides, and in ESD-sensitive areas, static-dissipative construction. Given people sit in these for full shifts, ergonomic adjustability is worth paying for.
Shop desks and documentation
Paper is a notorious particle source, which is why documentation in controlled areas is increasingly electronic. Where you do need a writing or terminal surface, a stainless shop desk gives you a cleanable one.
Lift equipment and heavy handling
The category people forget until they have a drum or a pallet to move inside a controlled space.
Standard industrial lift equipment is painted steel with open mechanisms and exposed hydraulics, which is a poor fit for a cleanroom. Purpose-built stainless versions exist across the range:
- Skid lifts and pallet trucks, manual or powered, for moving loads at floor level.
- Stackers, manual and powered, for lifting to height.
- Scissor lift tables for ergonomic positioning at a workstation.
- Tilters, including battery-powered stainless units, for controlled pouring and emptying.
What to check beyond the material: whether hydraulics and drive components are enclosed, whether the battery and charging arrangement is acceptable in your space, and whether the wheels meet the same non-shedding requirement as your carts. A stainless shell over an open mechanism is only half the job.
The reason to put a lift table in a cleanroom is not only the operator's back. Awkward manual handling means more movement, more exertion and more particle shedding from people, who are the largest particle source in any cleanroom. Equipment that reduces strenuous movement reduces contamination as a side effect.
Entry control and the rest of the system
Small items that do disproportionate work at the boundary.
Tacky mats
Adhesive-topped mats at entrances that pull particulate off shoe soles and cart wheels as they cross. Layered sheets are peeled off as they load up. Cheap, effective, and only effective if someone actually peels them on a schedule, so put that in your cleaning procedure rather than leaving it to be noticed.
Garment racks and cabinets
Freestanding, mobile or wall-mounted. Wall-mounted saves floor space in a gowning room where floor space is scarce and every object is a surface. Look for the open wire design that promotes laminar airflow, and consider enclosed garment cabinets with perforated shelves where garments need protection between uses.
Shoe racks
Sized to your headcount at shift change, not to your average. A shoe rack that overflows at 7am produces shoes on the floor, which defeats the purpose.
Bag roll dispensers
Controlled dispensing of liners and bags without an open box sitting on a surface generating particulate.
Storage cabinets
Stainless, in stationary, wall-mounted and mobile forms. Enclosed storage keeps supplies clean between uses; the trade is that a cabinet is a set of surfaces that need cleaning inside as well as out.
Mobile security units
Where materials are valuable, controlled or regulated, a lockable mobile unit gives you custody as well as cleanliness.
Spill containment
Where chemicals are stored or dispensed in or adjacent to the controlled space. See our cabinets guide for the OSHA requirements on flammable liquid storage, which do not relax because the room is clean.
Choosing by application
Find the row that matches your situation.
Common and costly mistakes
Most of these are decided at purchase and expensive to reverse.
Choosing solid shelving by default
It blocks laminar airflow and becomes a particle collection surface. Open wire or perforated should be the default in a cleanroom, with solid as the exception you justify.
Specifying 316 as a general upgrade, or 304 without checking
The grade is decided by your cleaning chemistry. Bleach-based means 316. Alcohol-based means 304 is sufficient. Buying 316 everywhere wastes money; buying 304 where bleach is used causes pitting.
Bringing standard industrial equipment into the controlled space
Painted steel, galvanised components, open tube frames and wood are all particle sources. Cleanroom versions of most equipment exist for a reason.
A gowning bench that is not fixed down
The bench is the physical line between the dirty and clean sides. If it can be shifted, so can the boundary. Use the flanged foot plates.
Furniture layout that fights the written procedure
If storage order does not match SOP order, you get deviations, and they get blamed on people rather than on the room.
Sizing gowning equipment to average headcount
Shift change is the peak, and an overflowing shoe rack or garment rack at 7am puts items on the floor.
Forgetting that carts cross boundaries
A cart moving between classes is a contamination pathway unless it is dedicated or wiped down under a documented step.
Assuming equipment raises your classification
Class comes from air handling, filtration, pressure cascade and discipline. Equipment protects it; it does not create it.
Buying tacky mats and not scheduling the peeling
A saturated tacky mat does nothing. It needs to be in the cleaning schedule with a frequency.
Overlooking bearings and wheels on mobile equipment
Open bearings emit lubricant and collect particulate. Sealed precision bearings and non-shedding wheels are the cleanroom specification.
Frequently asked questions
What comes up most often on quote calls.
What do ISO 5, 7 and 8 actually mean?
They are air cleanliness classes under ISO 14644-1, which runs from ISO 1 (cleanest) to ISO 9. The class sets a maximum particle concentration per cubic metre. ISO 5 permits 3,520 particles at 0.5 micron and above; ISO 7 permits 352,000; ISO 8 permits 3,520,000. Each step is a factor of ten, so ISO 5 is a hundred times cleaner than ISO 7. ISO 5 is typically inside laminar flow hoods and biosafety cabinets, ISO 7 is a buffer room, ISO 8 is an ante or gowning room.
Someone told me our room is "Class 100,000." What is that in ISO?
ISO 8. That older naming comes from US Federal Standard 209E, which counted particles per cubic foot and has since been withdrawn. The rough mapping is ISO 5 = Class 100, ISO 6 = Class 1,000, ISO 7 = Class 10,000, ISO 8 = Class 100,000. The equivalence is approximate because the standards measure differently, so use the ISO class on formal documents.
Should I buy solid or wire shelving for a cleanroom?
Open wire or perforated in most cases, which reverses normal warehouse logic. Cleanrooms rely on laminar airflow moving downward through the space; a solid shelf interrupts that flow and becomes a horizontal surface where particles settle and accumulate. Open shelving lets air pass and particles fall through. Use solid only where you genuinely must contain spills or very small parts, and put the cleaning of that surface into your written schedule.
Do I need 304 or 316 stainless?
Decide it from your cleaning chemistry rather than treating 316 as a general upgrade. Type 304 is sufficient where cleaning is alcohol-based, and it is what most cleanroom furniture is built from. Specify 316 where cleaning is bleach-based or where chlorides are present, because repeated chloride exposure pits 304. Tell your supplier what your cleaning SOP calls for and the answer follows.
Is electropolishing worth paying for?
In pharmaceutical and sterile applications, generally yes. Electropolishing removes a thin surface layer to leave a smoother, brighter, more corrosion-resistant finish, which means fewer microscopic crevices for contaminants to lodge in and an easier surface to clean. In a less critical ISO 8 ante room it is more of a nice-to-have.
When is polymer better than stainless?
When conditions are persistently wet or humid, when cleaning chemistry is aggressive or varied, when you want an antimicrobial surface, or when you want to remove shelf components and wash them separately. Polymer cannot corrode at all, where even good stainless eventually complains at fasteners and welds. Stainless still wins for heavy loads, high temperature, work surfaces taking abuse, and where a validated process names it.
What is a crossover bench and do I need one?
It is a gowning bench that physically separates the dirty side of a gowning room from the clean side. The user sits on the dirty side, swings their legs over, and puts clean-side feet down on the clean side. It is the only piece of equipment that makes the line of demarcation physical rather than notional, which is why it is the highest-priority item in a gowning room. Bolt it to the floor using the flanged foot plates, because a movable bench is a movable boundary.
What order does gowning happen in?
Broadly: remove personal items, change footwear and don shoe covers, cross the bench, wash and sanitise hands, don under-gloves in cleaner classes, then bouffant and mask, hood, coverall, boots, goggles and finally cleanroom gloves, then a visual inspection. The two principles are work top to bottom, and never let a clean surface touch a dirty one. Lay the furniture out in that order and the room enforces the procedure.
Will buying cleanroom equipment improve our classification?
No. Classification comes from air handling, filtration, air change rate, pressure cascade and the discipline of the people in the room. Equipment protects a classification the room already achieves, and the wrong equipment can help you lose it. If a room is failing particle counts, look at airflow obstruction and horizontal surfaces before buying anything, because removing clutter costs nothing.
Can I use a regular cart if I wipe it down?
Not advisable. Standard carts have painted or galvanised surfaces that chip and flake, open tube frames with internal cavities, and open bearings that emit lubricant and collect particulate. Cleanroom carts use non-shedding wheels, sealed precision bearings and sealed smooth frames. Wiping addresses the outside of a problem that is partly structural.
How do I handle carts that move between different ISO classes?
Either dedicate carts to a single zone, which is simplest and usually cheapest, or build a documented wipe-down into your procedure at the transition point. Decide before you buy, because the number of carts you need changes depending on which approach you take.
Does cleanroom seating really need to be different?
Yes. Cleanroom seating uses non-shedding surfaces and cleanable seams rather than conventional fabric upholstery, appropriate casters or glides, and static-dissipative construction where ESD matters. Since staff sit in them for whole shifts, ergonomic adjustability is worth specifying rather than treating seating as an afterthought.
Quick-reference spec table
Published figures and standards referenced in this guide. Confirm against the current standard and manufacturer data.
| Class | ≥ 0.5 µm per m³ | ≥ 5.0 µm per m³ | Air changes | Legacy name |
|---|---|---|---|---|
| ISO 5 | 3,520 | 29 | Not listed | Class 100 |
| ISO 6 | Not listed | Not listed | Not listed | Class 1,000 |
| ISO 7 | 352,000 | 2,930 | Min 30 per hour | Class 10,000 |
| ISO 8 | 3,520,000 | 29,300 | Min 20 per hour | Class 100,000 |
| Decision | Answer | Because |
|---|---|---|
| Alcohol-based cleaning | Type 304 | Sufficient corrosion and chemical resistance; the cleanroom default |
| Bleach-based cleaning | Type 316 | Chloride resistance; 304 pits under repeated exposure |
| Pharma and sterile | Electropolished | Smoother surface, fewer crevices, easier to clean |
| Persistent wet or washdown | Polymer | Cannot corrode; broad chemical resistance; antimicrobial options |
| Airflow and particle fallout | Open wire or perforated | Supports laminar airflow; particles fall through rather than settle |
| Gowning bench top | 14 gauge, 304 | Solid or perforated; reinforced underside channels; flanged foot plates |
| Edges and welds | Radiused, continuous, ground | Eliminates crevices that trap particles |
| Mobile equipment bearings | Sealed precision | No lubricant emission, no particulate collection |
| Family | Brands carried | Role |
|---|---|---|
| Gowning benches, solid and perforated | Metro, Eagle Group | The line of demarcation; crossover point |
| Garment racks, freestanding and wall-mounted | Eagle Group, Metro | Clean garment storage in the gowning sequence |
| Shoe racks | Eagle Group | Footwear change at entry |
| Lab and cleanroom benches | Eagle Group, Metro, Pucel, Strong Hold | Stainless work surfaces |
| Stainless work stands, 2 and 3 shelf | Jamco | Equipment support and staging |
| Polymer shelving and carts | Metro MetroMax, Nexel | Corrosion-proof storage in wet environments |
| Wire shelving and carts | Metro, Eagle Group, Nexel | Laminar-airflow-friendly storage |
| Solid shelving | Metro, Nexel | Containment where required |
| Stainless carts and platform carts | Metro, Jamco | Transport within the controlled space |
| Stainless storage cabinets | Eagle Group, Jamco, Metro | Stationary, wall and mobile enclosed storage |
| Mobile security units | Metro, Eagle Group | Controlled-access materials in transit |
| Wall-mounted stainless shelving | Eagle Group | Getting storage off a crowded floor |
| Bag roll dispensers | Eagle Group | Controlled consumable dispensing |
| Stainless shop desks | Strong Hold | Cleanable documentation surface |
| Lab chairs and stools | BioFit | Non-shedding ergonomic seating |
| Stainless lift equipment | Logitrans | Skid lifts, stackers, pallet trucks, scissor tables, tilters |
| Tacky mats | Apache Mills | Particle removal at entry |
| Spill containment | Not listed | Chemical storage in and around the controlled space |
ISO 14644-1 is a copyrighted standard and the figures above are the commonly cited limits for the classes shown; consult the current standard for the full table and for measurement methodology. Material guidance reflects industry practice rather than regulation. For grade, finish, gauge or dimensional detail on a specific model, call and we will pull the data sheet.