Cleanroom wall panels are the walls of your controlled space. They must be smooth, easy to clean, strong, and safe in a fire. But two panels that look the same can be built very differently inside and out.
This guide explains the key differences. You will learn what each core and facing does, which numbers to check, and how to choose the right panel for your room.
What Are Cleanroom Wall Panels?
Cleanroom wall panels are factory-made wall sections used in pharmaceutical plants, laboratories, hospitals, electronic factories, and food and cosmetic production. Most are sandwich panels: a core in the middle and a facing on each side.
The core controls fire behavior, insulation, weight, and stiffness. The facing controls cleaning, chemical resistance, and scratch resistance. The joints, corners, doors, windows, and cable openings decide whether the finished wall actually stays clean and sealed.
9 Differences Between Cleanroom Wall Panels
1. Core Material
The core is the biggest difference between panels. Here is what each one does.
Rock Wool (Mineral Wool)
Non-combustible core. Typical density is about 100 to 150 kg/m3 and thermal conductivity is about 0.040 W/m.K. It is heavier than foam cores and also helps with sound. Edges must be fully sealed because rock wool loses performance if it gets wet.
PU (Polyurethane)
PU (polyurethane) foam core with very good insulation, about 0.022 to 0.026 W/m.K, at low weight. It resists moisture well. Its fire performance is lower than rock wool.
PIR (Polyisocyanurate)
PIR is similar to PU but with better fire behavior. Typical thermal conductivity is about 0.022 to 0.024 W/m.k. It is a common upgrade when you want foam insulation with a better fire rating.
EPS (Expanded Polystyrene)
EPS is the lightest and cheapest foam core. Insulation is fair, about 0.035 to 0.040 W/m.K. EPS generally has lower fire performance than the other core materials listed here. Because of this, some pharmaceutical projects and projects with strict insurer fire requirements may not allow EPS panels. Always check the project’s fire requirements before choosing.
Aluminum Honeycomb
Aluminum cells between two facings. Very light, very flat, very rigid, and does not absorb water. It gives little insulation, so it suits rooms that do not need thermal control.
Paper Honeycomb
Lowest cost option and very light. Paper burns and fears moisture, so use it only in dry, low-risk rooms and ask for flame-retardant treatment. Avoid it in wet areas and in rooms with strict fire or GMP requirements.
2. Hand-Made vs Machine-Made Panels
Cleanroom panels can be made individually or produced on a continuous production line. The main differences are customization, production consistency, panel size, and cost.
Hand-Made Panels
They are assembled one panel at a time. The facing sheets, core material, and aluminum edge profiles are cut to size, bonded with adhesive, and pressed together. This method makes it easier to produce custom sizes, special shapes, built-in reinforcement, and factory-made openings for doors, windows, pipes, or equipment. It is often used for smaller projects or rooms with many custom details. Because more of the work is done manually, panel flatness, adhesive coverage, and dimensional accuracy depend heavily on the factory’s workmanship and quality control.
Machine-Made Panels
Are produced on a continuous or automated production line. The facing sheets and core pass through the line together, where adhesive, pressing, and panel dimensions are controlled during production. This gives more consistent thickness, flatness, and bonding across a large quantity of panels. Sizes and construction options are usually more standardized, so there is less flexibility for unusual shapes or details. Machine-made panels are commonly used for larger projects where many panels of the same specification are required.
What to ask: Ask whether the panels are hand-made or machine-made, what dimensional and flatness tolerances the factory follows, what custom sizes and openings are possible, and whether you can inspect a finished sample or panel cross-section before ordering.
3. Facing Materials
| Facing | Typical Thickness | Strong Points | Watch Out For |
| Galvanized steel with coating (PPGI) | 0.4 to 0.6 mm | Low cost, hard surface, wide color range | Cut edges and scratches can rust over time |
| Stainless steel 304 | 0.5 to 1.0 mm | Corrosion resistant, easy to clean | Can pit with strong chlorine disinfectants |
| Stainless steel 316 | 0.5 to 1.0 mm | Better against chlorides and harsh chemicals | Highest cost |
| Aluminum | 0.5 to 1.0 mm | Light, does not rust | Softer, dents more easily than steel |
| Glass-magnesium (MgO) board | 8 mm, 10 mm, to 12 mm | Non-combustible, hard and flat surface | Heavy; ask for low-chloride boards and moisture test results |
Simple rule: Coated steel for most dry and moderate rooms. Stainless 304 for wet or frequently washed rooms. Stainless 316 for areas that use bleach (sodium hypochlorite), hydrogen peroxide vapor, or strong acids.
4. Surface Coatings
On coated steel, the paint layer is what you actually touch and clean.
- Polyester (PE) coating on PPGI: The standard choice. The coating is usually about 20 to 25 microns thick. Good for general cleaning and common disinfectants.
- PVDF coating: A higher-grade coating with better resistance to chemicals and fading. Choose it for rooms with frequent or harsh disinfection.
- Powder coating: Applied after the sheet is cut and formed. Gives a thicker, tougher film and is common on hand-made panels.
- HPL or special laminates: Used where a very hard or decorative surface is wanted.
Also ask for the zinc coating weight of the steel under the paint (for example, Z120 or higher). A thicker zinc layer protects better at cut edges.
What to ask: Which coating, how many microns, and has it been tested against our disinfectants?
5. Fire Rating
Fireproof is not a rating. Two different things get mixed up, so check which one your project needs.
- Reaction to fire (EN 13501-1): Shows how much a material helps a fire grow. Classes run from A1 (non-combustible) to F. The codes s1 to s3 describe smoke, and d0 to d2 describe burning droplets. A rating like A2-s1,d0 is strong; B-s1,d0 is good for foam cores.
- Fire resistance (EN 13501-2): Shows how long a wall keeps its structure and blocks heat. Written as EI 30, EI 60, EI 90, and so on, in minutes. Rock wool and MgO panels are the usual choice when you need this.
- ASTM E84 (USA): Gives a flame spread index and a smoke developed index. Class A (flame spread 0 to 25) is the common target.
- FM approval (FM 4880): Some insurers require it. Confirm early.
Typical results: Rock wool panels often reach A2-s1,d0. PIR panels often reach B-s1,d0. PU, EPS, and paper honeycomb are normally lower. Always ask for the test report of the complete panel assembly you will receive, not just the core.
6. Thickness and Size
- 50 mm: The standard cleanroom wall. Works for most partitions up to about 3 to 4 meters high when supported by a proper top and bottom frame.
- 75 mm: For taller walls or when you need more stiffness and insulation.
- 100 mm: For temperature-controlled rooms, very tall walls, or large spans.
- Common panel width: 950, 1000, or 1150 mm, depending on the factory.
Thickness is not a quality measure on its own. A well-made 50 mm panel can beat a poorly made 75 mm panel. Ask the supplier to confirm wall height, supports, and the pressure the wall must carry.
7. Joints, Corners and Openings
A cleanroom wall is not one flat sheet. It is many panels joined together, and the joints are where dirt and leaks start.
- Panel-to-panel joints: Should be tight, sealed, and flush. Ask how the joint is sealed (gasket, silicone, or both).
- Corners: Coved corners with a radius, often around R50, are far easier to clean than sharp 90-degree corners.
- Wall-to-floor and wall-to-ceiling: Should have a sealed, cleanable connection with no gap.
- Doors, windows, pass-throughs: Frames should sit flush with the wall surface.
- Cables, pipes, and sockets: Mark them on the drawings before the panels are made. Factory-cut openings are cleaner and better sealed than holes cut on site.
- Wall-mounted equipment: Tell the factory in advance so reinforcement can be built into the panel.
Joints also matter for pressure. Many cleanrooms keep a pressure difference between rooms, and EU GMP Annex 1 gives a guide of 10 to 15 Pa between adjacent rooms of different grades. Gaps in joints, doors, and openings make this harder to maintain. Ask for an airtightness statement or test result for the wall system.
8. Cleanability, Particle Shedding and Outgassing
A wall should never add dirt or chemical vapors to the room. Three things matter here.
- Surface finish: Smooth, hard, non-porous surfaces are easiest to clean. Scratched or chalky coatings hold dirt. For stainless steel, ask for the finish name (for example, 2B or brushed) and the surface roughness value (Ra).
- Particle shedding: A rock wool core must be fully enclosed by the facings and edge profiles. Edges cut on site expose the fibers, so every cut edge must be sealed. Also check that the coating does not flake or chalk.
- Outgassing: Adhesives, sealants, and foam cores can release chemical vapors. This matters most in electronics and semiconductor rooms, where chemical contamination is controlled (ISO 14644-8 classifies air by chemical concentration). Ask for low-VOC adhesives and sealants, and for test data where your process requires it.
What to ask: Do you have particle-shedding or outgassing data for this panel, its adhesive, and its sealant?
9. Wall and Ceiling Integration
Walls and ceiling form one enclosure, and they should be designed together.
- One joint design: When walls and ceiling come from the same supplier, the wall-to-ceiling joint is designed once and sealed the same way as the wall-to-floor joint.
- Walk-on ceilings: Many cleanrooms use ceiling panels you can walk on for maintenance above the room. Ask for the load rating (in kg/m² or kN) and how the ceiling is hung.
- Ceiling openings: Filter modules, light fittings, sprinklers, and sensors all cut through the ceiling. Mark them on the drawings early, just like wall openings.
- Pressure: Leaks at ceiling joints affect room pressure as much as leaks in the wall.
What to ask: Can you supply the wall and ceiling as one system with one joint detail?
Cleanroom Wall Panel Comparison Table
| Panel Type | Fire Behavior | Insulation | Weight | Moisture | Relative Cost | Best For |
| Rock wool core | Non-combustible core (often A1/A2); whole panel often A2-s1,d0 | Medium | Heavy | Edges must be sealed | Medium | Pharma, fire-rated walls, sound control |
| PU core | Lower | Very good | Light | Good | Medium | Temperature-controlled rooms |
| PIR core | Better than PU | Very good | Light | Good | Medium to high | Temperature-controlled rooms with better fire needs |
| EPS core | Weakest | Fair | Very light | Fair | Low | Dry, low-risk rooms with no strict fire rule |
| Aluminum honeycomb core | Non-combustible core | Low | Very light | Excellent | High | Electronics, tall walls, ceilings, flat surfaces |
| Paper honeycomb core | Limited unless treated | Low | Very light | Poor | Low | Dry, general-purpose rooms |
| MgO board facing (over rock wool or honeycomb) | Board is non-combustible; whole-panel rating depends on the core | Set by the core | Heavy | Check board quality | Medium | Hospitals, high fire-rating needs |
Cost is relative and changes by region, steel price, and order size. Use it only to compare options. MgO is a facing, so insulation and weight depend on the core behind it.
Which Panel for Which Job?
| Use / Industry | Recommended Core | Recommended Facing | Why |
| Pharmaceutical sterile and filling areas (Grade A/B surroundings) | Rock wool or PIR | PVDF-coated steel or stainless 316 | Fire safety and strong chemical and disinfectant resistance |
| Pharmaceutical oral solid dose and packaging | Rock wool or PIR | PPGI or powder-coated steel | Good balance of cost and cleanability |
| Hospital operating rooms | Rock wool | MgO board, coated steel, or stainless steel | Fire rating and smooth, seamless surface |
| Electronics and semiconductor | Aluminum honeycomb or rock wool | Coated steel or aluminum, with ESD option where required | Flat, light, rigid walls; static control |
| Food and beverage | PIR or PU | Stainless 304 or food-grade coated steel | Moisture resistance and frequent washing |
| Cold or hot controlled rooms | PIR or PU, 75 to 100 mm | Coated steel or stainless steel | Best insulation |
| Laboratories | Rock wool or PIR | Coated steel or stainless steel | Fire safety and chemical resistance |
| Cosmetics and general GMP | Rock wool or PIR (paper honeycomb only in dry, low-risk areas) | PPGI | Lower cost for lower-risk areas |
Example 1: Pharma filling room. The room is washed with hydrogen peroxide vapor and needs a fire-safe wall. A rock wool core with a PVDF-coated or 316 stainless facing, coved corners, and factory-cut openings fits this room.
Example 2: Electronics assembly room. Chemical washdown is low, but the walls must be flat and quick to install, and static control matters. Aluminum honeycomb or rock wool panels with an ESD-suitable coated facing fit this room.
What Do ISO and GMP Say About Cleanroom Walls?
These standards are often misread, so here is what they actually cover.
- ISO 14644-1 classifies air cleanliness by the number of airborne particles. It does not name a wall panel for each ISO class. A wall panel does not have an ISO class. The room does.
- ISO 14644-4 covers how to design, build, and start up a cleanroom. Your panels must support the room’s overall performance, not just carry a label.
- ISO 14644-5 covers cleanroom operation, including cleaning and maintenance programs.
- EU GMP Annex 1 says exposed surfaces in clean areas should be smooth, impervious, and unbroken, so they can be cleaned and disinfected repeatedly
The panel material is only one part of compliance. The finished wall also includes the joints, corners, doors, windows, and openings for cables and pipes. A suitable panel can still cause problems if these areas are poorly sealed or difficult to clean.
How to Select Cleanroom Wall Panels
- What is the required ISO class or GMP grade? This sets how strict your surface, joint, and sealing needs are.
- What fire rating does the project need? Get the exact code (for example, A2-s1,d0 or EI 60) from your designer or insurer before you ask for quotes.
- Which disinfectants will you use, how strong, and how often? If the answer includes bleach or hydrogen peroxide vapor, move toward PVDF coating or stainless 316.
- How humid or wet is the room? Wet rooms favor PIR, PU, aluminum honeycomb, or stainless facings.
- Does the room need temperature control? If yes, look at PIR or PU in 75 or 100 mm.
- How tall is the wall, and what will hang on it? This decides thickness and reinforcement.
- How many doors, windows, and openings are there? Fix these on the drawings before production.
- Will the layout change later? If yes, ask for a demountable modular system that can be moved or reused.
How to Compare Quotations
Two quotes for a 50 mm cleanroom panel can describe very different products. Put them side by side.
| Item | What to Check |
| Core | Material, density, thermal value |
| Facing | Material, thickness (mm), grade (304/316) |
| Coating | Type (PE, PVDF, powder), microns, zinc weight |
| Made by | Hand-made or machine-made |
| Thickness and width | Confirm in mm |
| Fire documents | EN 13501-1 or ASTM E84 report for the full panel |
| Joint system | Gasket, silicone, and profile type |
| Coving and trims | Included or not |
| Doors and windows | Included or not |
| Service openings | Factory-cut or cut on site |
| Installation | Who installs, who supplies fixings |
| Freight | Included or separate |
| Warranty | Years covered and what is excluded |
Documents to request: data sheets, panel cross-section drawings, fire test reports, chemical resistance data, joint details, shop drawings, installation instructions, cleaning guide, and warranty terms.
Installation, Handover and Maintenance
At handover, check for: scratched or dented surfaces, open or uneven joints, missing sealant, sharp or hard-to-clean corners, gaps around doors or windows, unsealed openings, misaligned panels, and damaged trims. Remove the protective film following the manufacturer’s instructions and clean the surfaces before the room is commissioned.
During use, inspect regularly for: scratches and coating damage, rust, dents, loose and cracked sealant, open joints, panel swelling, or delamination and damage around openings.
How often you inspect depends on your process, risk level, and site procedures. Small damage can often be repaired following the manufacturer’s repair guide. Replace the panel when damage breaks the cleanable surface, the seal, or the strength of the wall.
Cleanroom Wall Panel Spec Checklist
Fill in this checklist before asking for a quote. It helps suppliers understand what you need and makes their quotations easier to compare.
- Room classification: ISO class or GMP grade for each room
- Room use: Process carried out in the room and the main contamination risks
- Fire requirement: Required EN 13501-1 class, ASTM E84 class, or fire resistance rating such as EI 30 or EI 60
- Core material: Rock wool, PIR, PU, EPS, aluminum honeycomb, paper honeycomb, or other specified core
- Facing material: Coated steel, stainless steel 304 or 316, aluminum, or MgO board, including the required thickness in mm
- Surface coating: PE, PVDF, powder coating, or other finish, including coating thickness in microns and zinc coating weight where applicable
- Panel production: Hand-made or machine-made
- Panel dimensions: Required panel thickness, width, and wall height
- Cleaning and disinfection: Chemicals used and how often the walls will be cleaned or disinfected
- Room conditions: Required temperature and humidity
- Panel joints: Joint type and sealing method, such as gasket, silicone, or both
- Corners and connections: Coved corners and details for wall-to-floor and wall-to-ceiling connections
- Doors and windows: Quantity, size, and location of doors, windows, and pass-throughs
- Service openings: Size and location of cable, pipe, socket, and other openings marked on the drawings
- Wall-mounted equipment: Equipment that will be fixed to the wall and any reinforcement required inside the panels
- Ceiling system: Ceiling type and required walk-on load rating, if applicable
- Particle shedding and outgassing: Required test data if these are important to your process
- Technical documents: Data sheets, fire test reports, chemical resistance data, and shop drawings required from the supplier
- Installation and handover: Who will install the panels and what checks must be completed before handover
- Warranty and future changes: Warranty period and whether the wall system may need to be moved, expanded, or reused later
Wrapping Up
The right cleanroom wall panel depends on your room requirements. Consider the cleanliness grade, fire rating, disinfectants, humidity, and wall height before choosing the core facing, coating, thickness, and joint system.
Not sure what fits your project? Sunnyda Clean Room can review your requirements, drawing, or spec checklist and recommend a suitable wall panel system. Send us your cleanroom details to get started.
Frequently Asked Questions
What thickness should a cleanroom wall panel be?
50mm is the standard. Use 75mm for taller walls or more stiffness and insulation, and 100 mm for temperature-controlled rooms or very tall walls.
What is the difference between PU and PIR panels?
Both are foam cores with excellent insulation. PIR has better fire behavior than PU and usually costs a little more.
Is rock wool better than PU and PIR for cleanrooms?
For fire performance, yes. Rock wool is non-combustible, while PU and PIR are foams. For insulation, PU and PIR are better. Rock wool is also heavier, and its edges must be sealed against moisture.
Can damaged cleanroom panels be repaired?
Minor surface damage can often be repaired with the manufacturer’s method. Replace the panel if the damage breaks the cleanable surface, the seal, or the structure.
Can modular cleanroom wall panels be reused?
Yes, many modular systems can be taken apart and rebuilt in a new layout. Before you reuse panels, check four things: the facings have no deep scratches, dents, or rust; the edge profiles and joints are not bent; the gaskets and sealant can be replaced; and the new layout uses the same panel thickness and width. If you expect layout changes, ask for demountable joints at the start.
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