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Clean Room Panels: 2026 Fire, Insulation & GMP Guide
Choosing clean room panels is not simply a matter of comparing panel thickness and price. For UK pharmaceutical, biotech, semiconductor, medical device, food, and battery projects, the panel system must balance fire performance, thermal insulation, structural stability, airtightness, and cleanability. A lower-cost panel can become expensive if it fails fire review, creates condensation, or requires extensive sealing during qualification.
This guide explains how to compare panel cores, thicknesses, fire classifications, GMP detailing, and procurement specifications before issuing an RFQ.
Clean Room Panels: Core Materials, Thickness and Insulation
Panel performance starts with the core. PIR, mineral wool, aluminum honeycomb, and paper honeycomb may look similar once enclosed between coated steel sheets, but their thermal and fire behavior differs significantly.
PIR, Mineral Wool, Honeycomb and Other Cleanroom Panel Core Options
PIR provides strong thermal insulation with relatively low weight. Depending on the specific product, PIR insulation commonly reaches thermal conductivity around 0.022–0.026 W/m·K, making it attractive for temperature-controlled production rooms.Mineral wool trades some thermal efficiency for better fire behavior. For reference, ROCKWOOL lists a declared thermal conductivity of 0.037 W/m·K and Euroclass A1 reaction-to-fire performance for one of its stone-wool insulation products.Honeycomb cores are lightweight and dimensionally stable but are normally selected for internal partitions rather than high-insulation envelopes.
Core | Typical Strength | Main Limitation | Common Application |
PIR | High thermal efficiency, low weight | Combustible core; system certification matters | Temperature-controlled cleanrooms |
Mineral wool | Strong fire performance, acoustic benefit | Heavier and usually more expensive | Pharma, hospitals, fire compartments |
Aluminum honeycomb | Lightweight, rigid | Limited thermal insulation | Internal partitions |
Paper honeycomb | Economical | Weak moisture/fire performance | Low-risk dry areas |
Comparing 50 mm, 75 mm and 100 mm Panels for Thermal and Structural Performance
A 50 mm panel is often adequate for internal partitions where both rooms operate at similar temperatures. Moving to 75 mm improves stiffness and insulation, while 100 mm systems are more appropriate where temperature gradients, tall partitions, ceilings, or fire resistance are significant.From the projects we’ve completed, thicker panels are most valuable where the wall is doing more than separating cleanliness zones. Cold rooms adjacent to ambient production areas, high ceilings, and fire-rated corridors often justify 75–100 mm construction.Thickness alone, however, does not prove structural or fire performance. Span tables, joint geometry, steel facing thickness, support spacing, and tested assembly configuration must also be reviewed.
Thermal Conductivity, U-Value and Condensation Control in Temperature-Controlled Cleanrooms
A simplified U-value can be estimated from thermal resistance, but real projects also include joints, metal skins, framing, penetrations, and thermal bridges.For example, increasing PIR thickness from 50 mm to 100 mm approximately doubles core thermal resistance. Mineral wool typically needs greater thickness to reach a similar insulation level because its conductivity is higher.Condensation risk should be assessed whenever adjacent spaces have significant temperature or humidity differences. A cold pharmaceutical room at 18°C beside a humid service corridor can develop condensation at joints or penetrations even if the nominal panel U-value appears acceptable.
Fire Rated Cleanroom Panels for UK Cleanroom Projects
Understanding Reaction-to-Fire vs Fire-Resistance Ratings
One of the most common procurement mistakes is treating reaction to fire and fire resistance as the same measurement.Reaction to fire describes how a product contributes to fire growth, flame spread, smoke, and flaming droplets. BS EN 13501-1:2018 provides the classification procedure for construction products.Fire resistance describes how long an assembled wall or ceiling maintains defined performance under fire exposure. An EI60 wall, for example, is designed and tested for 60 minutes of integrity and insulation under the applicable test configuration.That means fire rated cleanroom panels should be specified as tested systems, not simply as “fireproof core material.”
BS EN 13501-1 Classification and UK Approved Document B Considerations
For projects in England, Approved Document B provides statutory guidance supporting compliance with Building Regulations fire-safety requirements. Scotland, Wales, and Northern Ireland have separate regulatory frameworks, so national project location must be confirmed before final specification.Since March 2025, references to BS 476 national classes for reaction-to-fire classification have been removed from Approved Document B guidance in favor of the European classification approach.Do not accept an A1, A2-s1,d0, or B-s1,d0 claim without checking the test report and field of application. UK government guidance explicitly warns that fixings, substrates, orientation, joints, and mounting configuration can alter reaction-to-fire performance.
When Mineral Wool Panels Are Preferred for Higher Fire-Safety Requirements
Mineral wool is usually the stronger candidate where fire compartmentation drives the specification.Commercial cleanroom systems are available with rock-wool cores and tested resistance levels ranging from EI60 to EI120 and beyond. Some specialist systems reach EI180 depending on thickness, joint design, span, and installation configuration.In our experience, fire rated cleanroom panels should be selected during architectural and fire-strategy design rather than substituted late in procurement. Changing from PIR to mineral wool after coordination can affect panel weight, ceiling suspension, doors, penetrations, and installation cost.
GMP Cleanroom Panels: Hygiene, Sealing and Procurement Specifications
Smooth, Impervious and Cleanable Surfaces for Pharmaceutical Facilities
For pharmaceutical cleanrooms, surface performance matters as much as the core.EU GMP guidance requires exposed clean-area surfaces to be smooth, impervious, and unbroken so they minimize particle or microorganism accumulation and tolerate repeated cleaning and disinfection. It also calls for minimizing difficult-to-clean recesses and sealing false ceilings against contamination from spaces above.Typical GMP cleanroom panels therefore use factory-coated galvanized steel, stainless steel, or other chemically resistant finishes selected around the cleaning regime.ISO 14644-13:2026 also provides guidance for cleaning cleanroom surfaces to defined particle and chemical cleanliness levels.
Flush Joints, Coving, Airtight Sealing and Penetration Detailing
Good cleanroom wall panels can still perform poorly if installation detailing is weak.Panel joints should minimize ledges and recesses. Internal corners commonly use radiused coving, while electrical outlets, pipe penetrations, glazing, doors, and HEPA terminal interfaces require sealed transitions.For pressure-controlled rooms operating at perhaps +10 to +30 Pa relative to neighboring spaces, repeated small leakage paths can increase HVAC make-up air demand and make room-pressure stabilization more difficult.The weak point is often not the panel—it is the interface between the panel and other trades.
How to Select the Right Panel System
For most projects, core selection can be reduced to four priorities:
- High fire requirement:prioritize tested mineral-wool systems.
- High thermal requirement:consider PIR where the fire strategy allows it.
- Pharmaceutical/GMP application:prioritize flush, sealed, chemically resistant finishes.
- Internal non-temperature-controlled partitions:lightweight honeycomb systems may reduce structural load and cost.
For cleanroom wall panels, request full-system evidence rather than isolated material certificates. A wall with an excellent core but poorly designed joints, penetrations, or support details may still fail the project’s fire, pressure, hygiene, or validation requirements.
What to Include in a Cleanroom Panel RFQ: Core, Skin, Coating, Fire Rating and Certification
A useful RFQ should define at least:
- Panel core material and density
- 50, 75, or 100 mm nominal thickness
- Steel skin thickness and substrate
- Polyester, PVDF, PET, PVC, or stainless-steel finish
- Declared thermal conductivity
- Required Euroclass reaction-to-fire classification
- Required EI fire resistance where applicable
- Joint and sealant system
- Wall and ceiling support method
- Coving and corner details
- Door, glazing, utility, and service penetrations
- Test reports and certificates applicable to the proposed configuration
- Cleaning-agent and disinfectant compatibility
For GMP cleanroom panels, add requirements covering flush installation, cleanable interfaces, chemical resistance, surface repair procedures, and approved sealants.
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We'll call you
In order to serve you better, if you could kindly send an e-mail to nick@biogreenness.com for questions and details.
