What materials are used in modular clean rooms?

What Materials Are Used in modular cleanrooms?

modular cleanrooms use coordinated enclosure systems: wall and ceiling sandwich panels, framing, flooring, doors, windows, sealants, and penetration components. Cores may include rock wool, polyurethane, magnesium-based boards, or honeycomb. Facings may use coated steel, stainless steel, or aluminum. Floors may be resinous or resilient. Selection depends on process chemicals, cleaning methods, fire strategy, loads, and verified project-specific evidence.

Main material groups

Wall and ceiling sandwich panels form the enclosure; panels combine a core with facings. Aluminum or steel framing supports panels, doors, windows, and ceiling grids. Flooring may be resinous or resilient. Doors may be metal-based; windows may use glass or polycarbonate. Sealants and gaskets close joints and penetrations.

Core material versus exposed surface

Core, facing, adhesive, joints, and full product configuration jointly influence performance. The core mainly affects fire, thermal, acoustic, weight, and structural behavior; the facing affects cleanability, corrosion, chemical resistance, and durability.

What material choice does not determine

No material determines iso class, ACH, room pressure, or GMP compliance. GMP applies to facility, equipment, process, procedures, and quality systems, not a material name.

Modular cleanroom wall Panel Construction

Wall panels are cores bonded between facings; assemblies differ by supplier. Thickness, density, facing, adhesive, and joint design vary, so identical core names can perform differently.

Panel facings / surface skins

Pre-coated or coated steel

Coated steel performance depends on coating type, substrate, finish, and exposure compatibility. Request evidence against actual cleaning and process chemicals; not all coated steels perform identically.

Stainless steel

Stainless performance depends on grade, finish, fabrication, and chemicals. Specify grade and finish from project requirements, not a generic “stainless” label, and request product-specific corrosion data.

Aluminum

Aluminum performance depends on alloy, treatment, support, and cleaning compatibility. Verify surface treatment, impact and dent behavior, and support conditions against project requirements.

Other composite surface systems

FRP and HPL are possible categories only; absent product evidence they remain unverified. Request product-specific cleanability, fire, and chemical data for the exact product.

Panel core materials

Rock wool / mineral wool

Rock wool may suit fire and acoustic needs. Verify the specified characteristic, test method, tested configuration, and local code acceptance. Damaged or exposed fibrous cores present cleanability and particle-shedding risks.

Polyurethane or related foam cores

Polyurethane foams may provide thermal insulation at relatively low weight. Verify the specified fire characteristic, test method, tested configuration, and local code acceptance; formulations vary.

Magnesium-based cores

Magnesium-based cores include different MgO chemistries, so require the exact formulation. Request composition, moisture-aging evidence, and fire-test documentation for the specified characteristic and configuration.

Aluminum honeycomb

Aluminum honeycomb may offer light weight and stiffness. Verify load and span data for the actual assembly, including edges and connections, plus fire test data for the specified configuration.

Paper honeycomb or other lightweight cores

Paper honeycomb may suit selected dry applications. Wet-use suitability requires product evidence. Assess moisture, fire, structural, and lifecycle risks against project requirements.

No universally best core

No single core is universally best. Balance fire, moisture, thermal, structural, chemical, maintenance, and cost needs against project requirements; tradeoffs vary by application.

Ceiling Systems and Overhead Materials

The ceiling is both a structural and service interface supporting filters, lights, and utilities while maintaining enclosure integrity.

Modular ceiling panels

Ceiling panels may use cores similar to walls, but allowable spans and loads must come from ceiling-specific structural data. Support conditions often differ from walls.

Walkable versus non-walkable ceilings

Walkability requires complete-system evidence, including load limits, support spacing, and access rules. Never infer walkability from core material alone.

Ceiling grid and suspension

Grids typically use aluminum or steel framing. Coordinate with lights, HEPA housings, services, and penetrations. Verify structural capacity for actual loads, including filters and maintenance access.

Service access

Plan maintenance access without uncontrolled openings or surface damage. Access panels must seal properly when closed and should not degrade ceiling integrity during filter changes.

cleanroom flooring Materials

Flooring depends on performance requirements, not universal rankings. Semiconductor fabs may prioritize ESD control; pharmaceutical aseptic areas may prioritize cleanability and chemical resistance.

Resinous floors

Epoxy and other resinous floors may provide continuous finishes with few joints. They can be specified for chemical resistance, slip resistance, and ESD where required by the project standard.

Resilient sheet or tile systems

PVC and vinyl-type systems are possible options. Welded seams require product-specific and installation-specific verification. Assess load capacity, moisture sensitivity, and static control against project requirements.

Coving and floor-to-wall junctions

In applicable U.S. sterile drug or biological aseptic processing, FDA guidance describes rounded floor-wall junctions and seamless surfaces as an example; this is not a universal coving mandate.

Substrate condition

Substrate moisture, flatness, cracks, and load capacity affect flooring. Poor conditions can cause delamination or uneven surfaces. Assess the substrate before selection.

Doors, Windows and Vision Panels

Doors and windows are part of the envelope; their materials and seals affect pressure integrity, cleanability, and maintenance.

Cleanroom doors

Door performance depends on product and installation. Compare cleanability, corrosion resistance, impact resistance, hardware compatibility, and pressure sealing against project requirements. Specify the complete assembly.

Door cores and hardware

No universal core or hardware specification exists. Hardware must suit door material, gaskets, and usage frequency. Verify pressure and sealing claims for the specific product and installation.

Windows and glazing

Glazing may use tempered glass, double glazing, polycarbonate, or alternatives. Selection depends on safety, flushness, cleanability, thermal needs, and impact resistance. Specify glazing and frame as a coordinated assembly.

Flush details

Frames should avoid hard-to-clean recesses where cleanable surfaces are required. Requirements vary by application; industrial cleanrooms may tolerate recesses unacceptable in aseptic areas.

Seals, Joints, Gaskets and Connections

Joint details often determine whether suitable panels perform as intended; panels, floors, doors, and penetrations rely on seals.

Panel joints and connectors

Specify geometry, dismantling method, fasteners, and replacement. Joint design affects cleanability, sealability, and structural continuity over facility life.

Sealants

Base sealant selection on adhesion, facing compatibility, cure, and cleanliness. Request compatibility data against cleaning agents and process chemicals at actual concentration, contact time, temperature, and frequency.

Gaskets

Gaskets appear at panel joints, door frames, window frames, and filter housings. Assess compression, aging, chemical resistance, and replacement access; degraded gaskets create leaks.

Corners and coving

FDA aseptic guidance describes rounded junctions in applicable U.S. sterile drug or biological aseptic processing, but coving is not universal. Match details to process and cleaning requirements.

Penetrations and Through-Wall Interfaces

Utilities can defeat a well-built enclosure if penetrations are poorly detailed; every pipe, conduit, duct, and cable crossing the boundary is a potential leak path.

Electrical and data penetrations

Use sealed, maintainable interfaces compatible with pressure and cleaning requirements. Outlets and ports should be flush or semi-flush where required; coordinate locations before panel fabrication.

Pipes, gases and process utilities

Process pipes and gas lines require coordinated sleeves, seals, and access. Plan before panel fabrication, because site-cut penetrations can compromise integrity.

Duct and filter interfaces

Support housings and preserve seals. HEPA and ULPA housings require structural support and sealed connections; the ceiling grid must accommodate filter weight and maintenance access.

Future modifications

Plan maintainable access and replaceable seals. Difficult-to-modify systems force disruptive interventions, so design penetration and sealing systems with flexibility in mind.

How Material Requirements Change by Performance Need

Material selection is performance-driven, not industry-assigned. Evaluate options against these dimensions using specific evidence.

Chemical and disinfectant resistance

Evaluate against actual cleaning and process chemicals, including agent, concentration, contact time, temperature, and frequency. ISO standards do not set material compatibility values.

Moisture and corrosion resistance

Washdown, humidity, condensation, and leaks degrade materials. Evaluate moisture absorption, dimensional stability, and corrosion resistance through product evidence against actual exposure.

Fire and smoke performance

Fire claims require the specified characteristic, applicable test method, tested configuration, and local code or AHJ acceptance. The complete assembly and configuration determine fire performance.

Impact and wear resistance

Consider carts, equipment, cleaning tools, and maintenance. Requirements vary by area; specify impact resistance based on actual usage patterns.

Thermal performance

Specify insulation only where energy or temperature requirements justify it. Not all cleanrooms need high thermal performance; match it to actual temperature control needs.

ESD requirements

Where ESD control is required, specify tested floor and surface performance against the applicable project standard. Generic “antistatic” claims are insufficient; define the relevant standard before selection.

Cleanability, Hygiene and Maintenance

Cleanability ties materials to actual cleaning procedures and lifecycle maintenance. A smooth-looking material may not withstand repeated cleaning.

Smooth and cleanable surfaces

In applicable U.S. sterile drug or biological aseptic processing, FDA guidance describes smooth, hard, readily cleanable floors, walls, and ceilings; the guidance is nonbinding.

EU sterile manufacturing boundary

For sterile medicinal product manufacture, EU GMP Annex 1 §§4.5 and 4.7 address cleanable surfaces and material suitability within that scope; it does not apply universally.

Repairability

Ask how scratches, damaged panels, failed seals, and worn floors are repaired without creating hard-to-clean interfaces. Request repair procedures and materials.

Replacement compatibility

Confirm replacement panels, trims, sealants, and hardware availability over facility life. Verify replacement components match the approved assembly and maintain performance.

HVAC and Material Interfaces

The enclosure forms the boundary; HVAC creates the airborne environment. Materials and HVAC must be coordinated for the intended performance.

HEPA/terminal-filter interfaces

Coordinate ceiling support, seals, and maintenance access. Filter interfaces must maintain seal integrity under pressure and during changes; ceiling capacity must accommodate filter weight and maintenance loads.

Supply and return openings

Design openings to prevent uncontrolled leakage. Service-removable parts should not damage finishes or seals; openings must maintain integrity during operation and maintenance.

Condensation risk

Evaluate insulation, thermal bridges, and surface temperatures. In humid areas or cold surfaces, insulation and vapor barriers may be needed; account for expected surface temperatures.

Material choice does not determine ACH

ACH comes from airflow design, not material selection. It is calculated from supply airflow and room volume; material choice does not determine ACH.

Standards and Regulatory Boundaries

Standards set performance expectations, not universal material prescriptions. Use these references to inform selection, not certify products.

iso 14644-4:2022

ISO 14644-4:2022 specifies requirements for cleanroom design, construction, and start-up. It does not prescribe specific technologies or materials; material selection occurs within this framework.

iso 14644-5:2025

iso 14644-5:2025 specifies operations, including cleaning and maintenance programmes. It does not provide chemical-compatibility values; material selection must consider procedures defined under this standard.

United States — aseptic drug manufacturing

FDA aseptic-processing guidance is nonbinding and applies to applicable U.S. sterile drug or biological aseptic processing areas; it does not apply to semiconductor or general industrial cleanrooms.

EU / EEA — sterile medicinal products

EU GMP Annex 1 applies to sterile medicinal product manufacture within its scope. Sections 4.5 and 4.7 address surface and material expectations where applicable.

Fire/building regulations

Fire and building code acceptance is jurisdiction- and assembly-specific. Identify the applicable code and AHJ; fire claims need the specified characteristic, test method, tested configuration, and acceptance.

Deiiang Company-Published Material Information

The following is attributed to Deiiang company-published sources. It is presented as company-published claims, not independent verification.

Published panel options

Deiiang publicly lists rock wool, MGO/rock wool variants, silica cores, magnesium oxysulfide, polyurethane, aluminum honeycomb, paper honeycomb, and other options. Specific performance depends on exact product configuration and must be verified from product documentation.

Published surface and component options

Deiiang company pages list metal facings, steel doors, and aluminum alloy or 304 stainless steel window-frame options. Exact specifications require confirmation from company documentation.

Evidence boundary

Do not claim fire rating, chemical resistance, thermal conductivity, load capacity, moisture resistance, or lifecycle performance without exact verified product reports or specifications.

Material-testing case boundary

No sufficiently verified public Deiiang material case with independent project-specific laboratory, fire, chemical, or moisture testing was identified in available sources. Do not invent or assume test results.

How to Compare Cleanroom Material Proposals

Normalize supplier comparisons by requesting the same documentation from each. Material names alone are insufficient; identical core names may differ in density, facing, adhesive, edge design, and test results.

Supplier documentation to request

Request composition and core material, facing or coating specification, thickness, density where relevant, fire test reports for the specified characteristic and configuration, structural and thermal data, chemical compatibility, warranty terms, and maintenance instructions.

Material comparison table

The desktop view uses a standard table format. The mobile view uses a card format for smaller screens.

Avoid brochure-only comparisons

“Fireproof,” “antibacterial,” “chemical-resistant,” and “GMP compliant” require test scope, method, and acceptance criteria. Request the test standard, conditions, and report number.

Installation and Material Inspection Checklist

Verify materials and installation before enclosure acceptance; performance depends on correct installation.

Before installation

Verify approved submittals, certificates and reports, dimensions, finish, and storage. Confirm delivered materials match approved specifications.

During installation

Inspect damage, joint alignment, seal continuity, corners, penetration sealing, door and window interfaces, and ceiling support. Document deviations.

Before commissioning

Verify cleanable surfaces, sealed penetrations, repairs, and complete HVAC interfaces. Check seals are continuous and access panels close properly.

Handover documentation

Collect approved drawings, schedules, certificates, test reports, cleaning and maintenance instructions, warranties, and spare materials.

Common Material-Selection Mistakes

Material selection errors create long-term performance and compliance problems.

Choosing the core from price alone

Include fire, moisture, thermal, structural, and lifecycle requirements. A lower-cost core may require more expensive fire protection or replacement over time.

Treating the panel core as the cleanroom surface

The exposed facing drives cleaning and chemical resistance. Evaluate the surface against actual cleaning chemicals.

Calling a material GMP compliant

GMP applies to facility, equipment, process, procedures, and quality systems, not individual materials. Suitability must be demonstrated through qualification.

Assuming fire performance from material name

Fire performance requires the specified characteristic, applicable test method, tested configuration, and AHJ acceptance.

Ignoring cleaning-agent compatibility

Cleaning agents can degrade materials. Request compatibility evidence at actual concentration, contact time, temperature, and frequency.

Forgetting joints and penetrations

A suitable panel can fail at joints and penetrations. Seals, gaskets, and penetration details determine enclosure performance.

FAQs

What materials are commonly used for modular cleanroom walls?

Wall materials commonly combine coated steel, stainless steel, or aluminum facings with rock wool, polyurethane, magnesium-based, or honeycomb cores. Specific combinations depend on project requirements.

Which cleanroom panel core material is best?

There is no single best core. Selection depends on fire, moisture, chemical, load, cleanability, and budget requirements. Each project requires its own tradeoff analysis.

What flooring materials are used in modular cleanrooms?

Resin-based and resilient flooring may be used. Specify chemical, ESD, load, and moisture requirements based on actual conditions and project standards.

Does cleanroom material determine ISO classification?

No. ISO class is based on measured airborne particle concentration under defined conditions. Material choice affects cleanability but does not determine ISO class.

What material documents should I request from a supplier?

Request composition and core material, facing and coating specification, thickness, density where relevant, fire test evidence for the specified characteristic and configuration, structural and thermal data, chemical compatibility, warranty terms, and maintenance instructions.

Conclusion — Select Materials from Performance Requirements

Modular cleanrooms use varied core, facing, floor, door, window, seal, and framing materials. No universal material satisfies all applications; select from documented performance requirements and verified evidence for the specific project.

References

Primary standards and regulatory sources

• iso 14644-1:2015 — Cleanrooms and associated controlled environments — Part 1: Classification of air cleanliness by particle concentration. https://www.iso.org/standard/53394.html
• iso 14644-4:2022 — Cleanrooms and associated controlled environments — Part 4: Design, construction and start-up. https://www.iso.org/standard/72379.html
• ISO 14644-5:2025 — Cleanrooms and associated controlled environments — Part 5: Operations. https://committee.iso.org/standard/88599.html
• FDA Guidance — Sterile Drug Products Produced by Aseptic Processing — Current Good Manufacturing Practice. https://www.fda.gov/media/71026/download
• EU GMP Annex 1 — Manufacture of Sterile Medicinal Products. https://health.ec.europa.eu/document/download/e05af55b-38e9-42bf-8495-194bbf0b9262_en?filename=20220825_gmp-an1_en_0.pdf

Company-published sources (not independent standards)

• Deiiang hardwall cleanrooms. https://www.cleanroomequips.com/Hardwall-Cleanrooms/
• Deiiang cleanroom panels. https://www.cleanroomequips.com/Cleanroom-wall/