PF-091 UL94 HF-1 Flame Retardant Acoustic Fiber
PF-091 is a high-performance, UL94 HF-1 flame-retardant sound absorption material engineered from a non-woven polyester fiber blend. Designed by Technicon Acoustics as a non-toxic, non-wicking alternative to traditional polyurethane foam, PF-091 withstands temperatures up to 350 °F and provides superior acoustic absorption for OEM enclosures, heavy machinery, and specialty vehicles.
Key Technical Specifications
| Specification / Property | Value / Standard |
| Material Type | Non-woven blended polyester fiber (virgin & recycled blend) |
| Flammability Rating | UL94 HF-1 (Self-extinguishing, non-dripping) |
| Continuous Temp Rating | Up to 350 °F (176 °C) |
| Available Thicknesses | 0.5″, 1.0″, 1.5″, 2.0″ |
| Facing Options | RA (Reinforced Aluminum) / FS (FlameShield™) |
| Attachment Method | Pressure Sensitive Adhesive (PSA) Backing |
| Environmental & Health | Zero VOC off-gassing, non-wicking, highly UV & fluid resistant |
Download Technical Data
PF-091-X0-RA-33 Product Description: Fire resistant fiber with fiberglass reinforced aluminum facing and pressure sensitive adhesive.
PF-091-X0-FS-33 Product Description: Fire resistant fiber with FlameShield™ facing and pressure sensitive adhesive.
PF-091-X0-00-33 Product Description: Fire resistant fiber with pressure sensitive adhesive.
Where is PF-091 Flame Retardant Acoustic Fiber Installed?
The combination of heat resistance, flame rating, and sound absorption makes PF-091 a reliable material across multiple OEM platforms:
Generator enclosures
Marine engine rooms
HVAC units and ductwork
Off-road construction vehicles
Heavy-duty truck cabs and firewalls
Fluid pump and compressor housings
What OEM Applications Benefit Most from PF-091?
Using PF-091 acoustic fiber helps OEMs meet both regulatory and operational demands through the following:
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Power Generation: Soundproof linings for engine enclosures and gensets.
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Heavy Equipment & Specialty Vehicles: Cabin firewalls, floorboards, and engine compartments in agricultural and construction machinery.
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HVAC & Fluid Handling: Sound-dampening duct liners, commercial air handlers, and pump enclosures.
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Marine & Transportation: Engine room acoustic panels requiring high moisture resistance and UL flammability compliance.
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Facing Options & Customization
PF-091 is available with several facing options to meet application-specific needs:
- RA Facing (Aluminum). Offers heat reflection and rugged durability.
- FS Facing (FlameShield™). Adds fire and thermal resistance for high-risk environments.
- PSA Backing. Enables fast installation with pressure-sensitive adhesive.
- Multiple formats. Available in pre-cut parts or full sheets for seamless integration into OEM part designs.
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PF-091 with RA and FS Facing -
PF-091 with FS Facing 
Compressed Fiber vs Uncompressed Fiber
Why Choose PF-091 Fiber Over Traditional Polyurethane Foam?
Polyurethane foam can degrade under high UV exposure, absorb oils, and emit off-gassing over time. PF-091 delivers a durable, non-wicking alternative that solves these critical OEM challenges:
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High-Temperature Stability: Performs continuously up to 350 °F without thermal breakdown.
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Superior Chemical & Fluid Resistance: Hydrophobic fiber blend repels water, fuels, and industrial oils.
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Zero Off-Gassing / Fogging: Contains no harmful volatile organic compounds (VOCs), protecting operator cabin air quality.
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Sustainable Composition: Formulated using pre- and post-consumer recycled polyester fibers.
Sustainability & Environmental Considerations
PF-091 is an environmentally conscious choice for manufacturers committed to sustainable practices:
- Made from a blend of virgin, pre-consumer, and post-consumer polyester fibers
- Free from off-gassing, harmful VOCs, and fogging
- Recyclable and supports green manufacturing goals
- May also be eligible for Advanced Manufacturing Production Credits
Related OEM Acoustic Products
Looking for additional sound-blocking solutions? See our Mass Loaded Vinyl for OEM Equipment. This product is ideal for airborne noise control in machinery and generator compartments.
Request a Quote or Application Review
Need help determining the correct configuration for your project? Contact our team for a quote or application review. We’ll help you select the ideal facing, thickness, and installation method to meet your OEM requirements.
Engineering Questions and Answers
How does PF-091 achieve a UL94 HF-1 flammability rating without polyurethane foam?
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Answer: PF-091 is engineered from a non-woven, blended polyester fiber structure with inherent flame-retardant properties. Unlike traditional polyurethane foam, it self-extinguishes during horizontal flame testing without releasing flaming drips or harmful VOC off-gassing.
Can PF-091 polyester acoustic fiber be used in hot, wet, or oily environments?
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Answer: Yes. PF-091 maintains its structural integrity at continuous operating temperatures up to 350 °F. Its non-wicking synthetic fiber composition naturally resists moisture, oils, fuels, and UV exposure, preventing mold growth and material degradation in harsh engine compartments.
What facing options and adhesive backings are available for PF-091?
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Answer: PF-091 can be customized with RA Facing (fiberglass-reinforced radiant aluminum for heat reflection) or FS Facing (Flame Shield™ for added flame protection). It is also available with Pressure Sensitive Adhesive (PSA) for fast, peel-and-stick assembly line installation.
What standard thicknesses and custom fabrication options does Technicon offer for PF-091?
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Answer: PF-091 is available in standard thicknesses of 0.5″, 1.0″, 1.5″, and 2.0″. Technicon Acoustics provides full-service custom fabrication, including CNC knife cutting, waterjet cutting, and die-cutting for pre-cut parts, gaskets, and acoustic kits tailored to your OEM part designs.
Is PF-091 a direct substitute for fiberglass or melamine foam in generator and machinery enclosures?
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Answer: Yes. PF-091 serves as a lightweight, non-toxic alternative to melamine foam and fiberglass. It excels at low-frequency sound absorption while avoiding the fiber shedding, skin irritation, and moisture-retention issues often associated with traditional insulation materials.