ISO 14644 Cleanroom Standards Explained: What Panel Specifications Do You Need

For engineers and procurement managers building a cleanroom in Saudi Arabia, the UAE, Vietnam, or Malaysia, choosing the wrong wall panel can mean failing an ISO 14644 audit — or worse, a GMP re-inspection. ISO 14644 is the international benchmark for cleanroom classification, and it has direct implications for the panels you specify on every project.

This guide breaks down what ISO 14644 actually demands at each classification level, translates those requirements into concrete panel specifications — surface finish, sealing, material, and fire rating — and explains which Glostar cleanroom panel systems are engineered to meet those standards.

What Is ISO 14644 and Why Does It Govern Panel Selection?

ISO 14644 is a multi-part international standard that defines cleanroom classification by airborne particulate concentration. Part 1 establishes nine classes (ISO Class 1 being the most stringent, ISO Class 9 the least). For most pharmaceutical, medical device, semiconductor, and electronics manufacturing facilities, the relevant range is ISO Class 5 through ISO Class 8.

The standard does not prescribe specific panel materials by name. Instead, it defines the environmental outcomes a cleanroom must achieve — particle counts, pressure differentials, air change rates — and these outcomes impose very specific requirements on the walls, ceiling, and floor that contain them. A wall panel that generates particles, harbors microbes, or allows air infiltration will cause the room to fail classification testing regardless of how well the HVAC system performs.

ISO Class 5–8: Classification, Applications & Panel Requirements at a Glance

The Four Panel Properties That Determine ISO Compliance

1. Surface Finish and Roughness (Ra Value)

Surface roughness is measured in Ra (arithmetic mean roughness). Microscopic peaks and valleys on a rough surface trap particles and support microbial colonization — both of which will cause particle counts to spike during in-operation testing. For ISO Class 5 and 6 applications, particularly in Saudi and UAE pharmaceutical facilities operating under GMP EU Annex 1 or SFDA standards, surface Ra must be ≤ 0.5–0.8 µm.

Pre-painted galvanized steel or stainless steel facings with a factory roller-coat finish typically achieve Ra values of 0.4–0.8 µm. Corners must be coved (rounded radius ≥ 50mm) at ISO Class 5–6 to eliminate 90-degree dust-trapping joints.

2. Joint Sealing and Airtightness

Cleanrooms maintain positive or negative pressure differentials (typically ±10–15 Pa between zones). Any unsealed joint in the wall or ceiling envelope will allow air infiltration, destroying pressure control and introducing unfiltered particles. For ISO Class 7 and above, all panel-to-panel joints, panel-to-floor joints, and panel-to-ceiling joints must be continuously sealed with pharmaceutical-grade neutral-cure silicone sealant — not merely gasketed.

In high-humidity environments common to Vietnam and Malaysia electronics factories (relative humidity often 70–85%), the sealant must also maintain adhesion and flexibility without shrinking or cracking over time. Exposed fasteners are not acceptable in ISO Class 5–6 environments because they create particle-shedding sites.

3. Core Material: PIR, Rockwool, or EPS?

The core material affects thermal performance, fire behavior, and chemical off-gassing — all of which matter for cleanroom classification:

• PIR (Polyisocyanurate): Best choice for ISO Class 5–7 pharmaceutical and biotech cleanrooms. Low VOC off-gassing, excellent thermal performance (λ ≈ 0.022 W/mK), and Class B fire behavior. Widely used in UAE and Saudi pharma plants operating under EU GMP or WHO GMP standards.
• Rockwool (Mineral Wool): Preferred where fire regulations are paramount, particularly in Middle East facilities under NFPA or local civil defense codes. Non-combustible (Class A2), excellent sound attenuation, and moisture-resistant. Suitable for ISO Class 6–8.
• EPS (Expanded Polystyrene): Cost-effective for ISO Class 7–8 applications such as food processing or general electronics in Vietnam and Malaysia. Not recommended for pharmaceutical applications requiring high fire ratings or sterile environments.

4. Fire Resistance and Local Code Compliance

In Saudi Arabia and the UAE, new industrial and pharmaceutical construction must comply with Civil Defense fire codes that reference NFPA 101 or EN 13501-1 standards. ISO Class 5–6 cleanrooms in these markets typically require wall panels rated at minimum Class B (EN 13501-1), with Class A2 (non-combustible) rockwool panels increasingly specified for critical pharmaceutical zones. In Vietnam and Malaysia, local building codes (QCVN 06 and MS 1183 respectively) follow similar European fire classification frameworks.

How Glostar Cleanroom Panels Meet ISO 14644 Requirements

Glostar manufactures cleanroom sandwich panel systems from our facility in Shandong, China, specifically engineered for export to the Middle East, Southeast Asia, and South America. Our panels are available with PIR and rockwool cores and are supplied with matching coved aluminum corner profiles, pharmaceutical-grade silicone sealant kits, and concealed cam-lock joint systems.

Our panels have been used in pharmaceutical, medical device, electronics, and food processing cleanrooms across the GCC and Southeast Asia. All panels are manufactured under ISO 9001 quality management systems with full batch traceability documentation available for GMP audit purposes.

Regional Compliance Notes for Middle East and Southeast Asia

Saudi Arabia & UAE: Pharmaceutical manufacturers seeking SFDA (Saudi Food and Drug Authority) or MOHAP (UAE Ministry of Health) GMP approval must demonstrate cleanroom classification per ISO 14644-1 and maintenance qualification per ISO 14644-2. Civil Defense fire inspections in both countries require wall assembly fire test certificates under EN 13501-1 or equivalent. Rockwool-core panels are increasingly the standard for critical zones in Saudi pharma factory projects.

Vietnam & Malaysia: Electronics and semiconductor fabs operating under ISO Class 6–7 conditions typically follow IEC and SEMI standards that reference ISO 14644 for environmental classification. The China Plus One manufacturing shift has driven a significant increase in new fab construction in both countries since 2022, with imported panel systems from established Chinese manufacturers preferred for their cost efficiency and documented track record.

Conclusion

ISO 14644 cleanroom classification is not just about HVAC design — it starts with the envelope. Getting panel surface finish, joint sealing, core material, and fire rating right at specification stage is far less costly than remediation after a failed classification test. For engineers and procurement teams working on ISO Class 5–8 projects in the Middle East or Southeast Asia, Glostar's cleanroom panel systems are engineered to meet these requirements with full documentation support.

Explore our Cleanroom Panel Systems or visit our Cleanroom Solutions page for application-specific guidance, or contact [email protected] with your project specifications.