Anyone who designs piping or ventilation systems for cleanrooms, semiconductor facilities, or chemical process air distribution will sooner or later encounter two standards: FM 4910 and FM 4922. Both are issued by the American testing institute FM Global, and both are far more than just bureaucratic hurdles. They define which materials are even permitted for use in safety-critical environments.
In this article, we explain what these standards entail, what specific requirements they set, and which Beck materials meet them.
What is FM Global, and why are its standards relevant?
FM Global (Factory Mutual) is one of the world’s largest industrial insurance companies and operates its own research and testing laboratories. The resulting FM standards have established themselves internationally as the benchmark for fire protection in industrial facilities—particularly in the semiconductor, pharmaceutical, and chemical industries.
An FM-listed material means that it has been independently tested and meets defined minimum requirements for fire performance. For designers and operators, this is often not just a technical recommendation, but an insurance-related and regulatory requirement.
FM 4910: The Standard for Cleanroom Materials
What is it about?
FM 4910 (officially the “Cleanroom Materials Flammability Test Protocol”) evaluates how plastics and other materials behave in the event of a fire in cleanroom environments. The standard was originally developed for the semiconductor industry, but is now used wherever contamination from smoke or fire gases is a critical concern.
What makes cleanrooms unique is that even a small smoldering fire—which can occur in conventional plastic components—is enough to contaminate an entire production line. The damage caused by smoke particles and corrosive combustion products often far exceeds the actual fire damage.
What exactly does FM 4910 test?
The standard evaluates two key parameters:
Fire Propagation Index (FPI): This index describes how quickly a fire spreads through a material and is determined through three sequential test procedures. In this process, a material sample is exposed to external radiant heat of 50 kW/m² in the presence of a pilot flame. The results are used to calculate the so-called Critical Heat Flux (the maximum heat flux density at which ignition no longer occurs) as well as the Thermal Response Parameter, which serves as a measure of ignition resistance.
Smoke Damage Index (SDI): The Smoke Damage Index. It assesses the extent to which the surrounding environment is contaminated by smoke during a fire. For cleanrooms, this value is often even more critical than the FPI: Even small amounts of smoke can cause permanent damage to highly sensitive production processes.
A material is considered FM 4910-compliant if it meets both thresholds simultaneously.
Where is FM 4910 required?
FM 4910 is referenced in NFPA 318—the Standard for the Protection of Semiconductor Fabrication Facilities—and is required as a minimum standard in the semiconductor industry worldwide. The standard is also gaining increasing importance in the pharmaceutical, biotechnology, and optical industries—in short, wherever freedom from contamination is a top priority.
FM 4922: The Standard for Exhaust Air and Exhaust Gas Ducts
What is this about?
FM 4922 (“Fume Exhaust Ducts or Fume and Smoke Exhaust Ducts”) does not apply to pipe materials in general, but specifically to duct systems for the exhaust of non-flammable chemical fumes and corrosive gases. The standard specifies approval requirements for ducts with diameters ranging from approximately 300 to 1,500 mm.
What exactly does FM 4922 test?
The focus is on three areas:
- The fire behavior of the duct material: In the event of a fire, the material must not allow flames or smoke to spread to adjacent areas.
- Corrosion resistance: Ducts for aggressive chemical vapors must be permanently resistant to the substances they carry.
- Structural integrity under fire exposure: The duct must maintain its function for a sufficient period of time even when exposed to fire.
Where is FM 4922 relevant?
FM 4922 primarily applies to exhaust systems in semiconductor factories, chemical laboratories, and industrial process chimneys where aggressive or corrosive gases are vented. FM-listed exhaust ducts are mandatory in many facilities and are a key factor in bidding processes and insurance assessments.
FM 4910 and FM 4922—what's the difference?
In short: FM 4910 evaluates individual materials and components for their suitability for cleanrooms, with a focus on fire spread and smoke contamination. FM 4922, on the other hand, evaluates duct systems as a whole for their suitability for the safe removal of chemical vapors. Both standards may be relevant in the same project and complement each other.
Which Beck materials meet these requirements?
PVDF: The Top Choice for FM 4910 Projects
PVDF (polyvinylidene fluoride) according to Solef 6008 is the prime example of an FM 4910-compliant plastic in the Beck product line. The material is recognized as an FM 4910-listed material and meets the UL 94 V-0 flame retardancy rating—the highest classification for self-extinguishing plastics.
In addition, it offers excellent chemical resistance to aggressive process media, extremely low smoke and toxic emissions in the event of a fire, and high thermal stability. During operation, PVDF releases virtually no particles, a decisive advantage for cleanroom environments.
PVDF is the clear recommendation when FM 4910 compliance is required by contract or regulation.
PPs: Flame-retardant and versatile
PPs (stabilized polypropylene) is the flame-retardant variant of classic polypropylene and meets the fire safety classes UL 94 V-0 and DIN 4102 B1 (flame-retardant). PPs thus meets the basic fire safety requirements for many industrial process air applications, even where FM 4910 listing is not strictly required but documented flame-retardant performance must be demonstrated.
PPs-el: Fire Safety and Electrical Conductivity in One
PPs-el (stabilized, electrically conductive polypropylene) combines the flame-retardant properties of PPs—UL 94 V-0 and DIN 4102 B1—with electrical conductivity at a surface resistance of approximately 10⁵ ohms. The material has been specifically developed for applications in which electrostatic dissipation (ESD protection) is required in addition to fire protection (a common requirement in the semiconductor and electronics industries). The operating temperature range is -5 °C to +80 °C (depending on pressure).
Note: The UL 94 V-0 rating for PPs-el is based on a self-assessment without an external test certificate.
What does this mean for your planning?
If you are designing systems for cleanrooms, semiconductor facilities, or chemical process air distribution, it is worth clarifying the following questions early on:
- Is FM 4910 compliance required by contract or by standard? If so, PVDF (Solef 6008 FM4910) is the only option.
- Is documented flame-retardant performance according to UL 94 V-0 or DIN 4102 B1 sufficient? In that case, PPs and PPs-el offer the appropriate properties.
- Are exhaust ducts for aggressive chemical vapors part of the project? If so, FM 4922 requirements should be factored into the material selection from the very beginning.
- And does electrostatic dissipation play a role? In that case, PPs-el is the solution that combines fire protection and ESD protection.
For specific design work, Beck provides CAD data for process air components for download. This allows you to incorporate the material selection directly into your planning.
Conclusion
FM 4910 and FM 4922 are not abstract standard abbreviations. They describe specific, measurable requirements for the fire behavior of materials and systems in environments where a fire would result not only in property damage but also in extensive production and contamination damage.
With PVDF (FM 4910-listed), PPs, and PPs-el, Beck offers a tiered material portfolio that covers the varying levels of requirements for safety-critical applications—all backed by comprehensive documentation.
Are you planning a project that meets FM 4910 or FM 4922 requirements?
Please contact us. We’ll advise you on material selection and provide you with the necessary documentation.