Polyurethane Foam Engineering & Manufacturing Since 1981

PU Foam Manufacturer & Wholesale Supplier

Next-generation polyurethane foam solutions - high-resilience (HR) PU, memory foam, integral skin PU, breathable open-cell insole foam, and molded footwear components engineered for athletic shoes, ergonomic seating, automotive interiors, and protective gear.

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250,000㎡

Factory area

90+

High-pressure PU pouring lines

Production bases

40+

Years of manufacturing

About Firefox Foam

Polyurethane (PU) Foam Solution Provider & Custom Insole Manufacturer

Quanzhou Firefox New Material Co., Ltd. is an industry-leading foam manufacturer and global exporter established in 1981. With production bases in China, Indonesia and Vietnam, we are an approved OEM/ODM supply partner to global retail and footwear brands including Walmart, Target, LIDL, Costco, Skechers, and PUMA. Specializing in polyether and polyester polyol formulation chemistry, high-pressure polyurethane metering, in-mold foaming, and CNC precision converting, we supply premium high-resilience PU insoles, viscoelastic memory foams, integral skin molded parts, and acoustical PU sheets with zero ODP and ultra-low VOC emissions.

40+ years polyurethane expertise

Pioneering polymer compounding, microcellular reaction injection molding, and ergonomic insole fabrication since 1981.

Clean polyether & polyester chemistry

Advanced water-blown and physical blowing systems eliminating CFCs, toxic heavy metals, and persistent amine odors.

Superior dynamic rebound & airflow

Open-cell breathability combined with >60% HR energy return and permanent compression set recovery (<5%).

Full OEM / ODM converting

Custom 3D mold tooling, density gradients (30–600 kg/m³), antibacterial treatments, and textile lamination.

Factory Scale & Production Lines

PU Foam Factory Scale & Production Bases

Three international production bases operating under strict ISO quality management. Our multi-country manufacturing footprint enables flexible tariff optimization, short lead times, and continuous high-volume supply for global footwear and industrial brands.

China - Quanzhou, Fujian

Headquarters and primary R&D center. Equipped with high-pressure polyurethane pouring carousels, polymer synthesis labs, insole molding lines, and multi-axis CNC tooling workshops.

Indonesia

High-volume mass production base serving Southeast Asia footwear assembly clusters, lowering landed shipping costs and regional supply risks.

Vietnam

Dedicated export facility providing strategic tariff diversification for US and European tier-1 athletic footwear, work boot, and automotive interior brands.

Inside Our Polyurethane Foaming Lines

Advanced reaction injection molding, continuous block pouring, precision skiving, and automated thermoforming lines.

High-pressure pouring carousels

Automated multi-station rotary pouring machines with robotic precision dispensing for uniform density molded midsoles and footbeds.

Continuous PU bun foaming

Maxfoam-type continuous conveyor foaming lines producing open-cell and high-resilience master blocks with zero center scorch.

Precision splitting & contouring

Automated horizontal loop slitters and CNC profile-cutting machinery achieving ±0.15mm thickness tolerances.

Biomechanics & comfort lab

Dynamic impact fatigue testers, SATRA TM142 insole rebound meters, and constant-climate hydrolysis chambers.

Product Definition

What Is Polyurethane (PU) Foam?

Polyurethane foam is a versatile cellular polymer created via the exothermic reaction of polyols (polyether or polyester) with diisocyanates (MDI/TDI) in the presence of blowing agents, catalysts, and cell stabilizers.

By precisely engineering the polymer chain architecture-balancing flexible polyol segments and rigid urethane/urea hard segments-polyurethane foams achieve a wide range of physical properties, from ultra-soft open-cell memory foams to high-resilience (HR) elastomeric footbeds and tough self-skinning molded parts.

Unlike closed-cell thermoplastic foams, open-cell PU foam offers natural micro-ventilation, moisture management, and compression-set recovery under repeated mechanical cycles. This makes polyurethane the gold standard for athletic shoe insoles, safety footwear midsoles, ergonomic seating, and acoustic dampening.

Who buys this product?

Athletic & performance footwear brands
Orthopedic & arch-support insole converters
Safety footwear & work boot manufacturers
Ergonomic office seating & mattress brands
Automotive seating & headrest component tiers
Protective sports gear & helmet liner makers

Product Range & Applications

PU Foam Products & Where They Are Used

We supply polyurethane foams across high-resilience insole grades, molded footwear systems, slow-recovery memory foams, and self-skinning molded parts tailored to your hardness and density requirements.

High-Resilience (HR) PU Insole Foam

Open-cell high-resilience polyurethane foam engineered for athletic running shoe insoles, orthotic arch supports, and long-distance cushioning with >60% energy return.

Molded PU Footwear Midsole & Outsole Material

Microcellular elastomeric polyurethane system formulated for direct-injection footwear soles, safety boots, and lightweight work shoe midsoles offering extreme flex endurance.

Viscoelastic Memory Foam (Slow-Recovery PU)

Temperature-sensitive slow-recovery polyurethane foam delivering progressive pressure redistribution, shock absorption, and contouring comfort for orthopedic insoles and ergonomic pads.

Integral Skin Polyurethane (ISF) Molded Components

High-durability self-skinning PU foam featuring a dense, wear-resistant outer skin over a cellular core for ergonomic handles, automotive armrests, slides, and impact cushions.

Where Polyurethane Foam Is Used

Matching polyol chemistry and cell structure to critical performance environments:

Athletic & Running Footwear

High-rebound insoles, molded heel cups, and lightweight shock-absorbing footbeds for marathon and training footwear.

Work & Safety Footwear

Anti-fatigue standing footbeds, dual-density safety shoe midsoles, and puncture-resistant PU work boot outsoles.

Orthopedic & Medical Orthotics

Custom diabetic footbeds, plantar fasciitis relief insoles, and anatomical arch-support pads resisting compaction.

Ergonomic Seating & Furniture

High-resilience office chair cushions, executive headrests, and pressure-relieving viscoelastic memory foam toppers.

Automotive Interior & NVH

Acoustic engine hood absorbers, dashboard vibration dampers, molded seat cushions, and steering wheel skin foams.

Sports Protection & Helmets

Multi-impact helmet liners, motorcycle chest protectors, shin guard pads, and high-impact protective equipment.

Product Advantages

What Are the Advantages of Polyurethane (PU) Foam?

Engineered polyurethane matrices deliver long-lasting cushioning, breathability, and ergonomic pressure management where thermoplastic foams pack out.

Ultra-low compression set

Maintains over 95% of original thickness and cushioning geometry after 100,000 continuous compression cycles (<5% permanent set).

Open-cell airflow & breathability

Interconnected open cell structure allows continuous air circulation, dissipating heat and sweat moisture during vigorous exercise.

Customizable rebound dynamics

Formulations tuned from zero-rebound viscoelastic memory foam (<10% ball rebound) up to explosive high-rebound HR (>65%).

Superior moldability & bonding

Direct in-mold chemical bonding with mesh, velvet, and technical fabrics without solvent-based adhesive delamination.

Technical Specifications

Polyurethane (PU) Foam Material Technical Data Sheet

Standard mechanical, rebound, and durability parameters across our primary polyurethane foam formulations. Custom formulations and bio-based polyol blends available.

Property / Parameter	High-Resilience (HR) PU	Memory Foam (Viscoelastic)	Integral Skin (ISF) PU	Microcellular Shoe PU
Cell Structure	Open-Cell Microcellular	Open-Cell Slow-Recovery	Dense Skin / Micro Core	Closed / Semi-Open Micro
Density Range (kg/m³)	35 – 90	45 – 110	250 – 550	280 – 650
Hardness Range	20 – 45 Shore C	10 – 30 Shore C	40 – 75 Shore A	35 – 65 Shore C
Ball Rebound Resilience (%)	55% – 68%	≤ 8% (Slow Recovery)	25% – 45%	45% – 60%
Tensile Strength (kPa)	≥ 280	≥ 180	≥ 1,800	≥ 2,200
Tear Strength (N/cm)	≥ 18	≥ 12	≥ 45	≥ 55
Compression Set (75%, 22h, 23°C)	≤ 5%	≤ 6%	≤ 8%	≤ 6%
Hydrolysis Resistance (70°C, 95%RH)	Passed (14 Days Polyether)	Passed (14 Days)	Passed (14 Days)	Passed (21 Days Ester/Ether)
Airflow Rate (cfm / L/min)	2.5 – 5.0 cfm	0.8 – 2.0 cfm	Non-porous skin	0.5 – 1.8 cfm
Flammability Standard	CA TB 117-2013 / FMVSS 302	CA TB 117-2013	FMVSS 302 / UL94 HB	FMVSS 302 / EN ISO 20345
Standard Thickness / Caliper	2.0 mm – 150 mm	3.0 mm – 120 mm	Molded Parts / 5–50 mm	Molded Soles / 3–40 mm

Material Selection Guide

PU Foam vs. EVA Foam vs. Ortholite-Type Open Cell vs. Latex Foam

Compare polyurethane footbed formulations against other common cushioning and shoe insole materials:

Performance Metric	Polyurethane (PU) Foam	EVA Foam	Ortholite-Type PU	Natural Latex Foam
Polymer Architecture	Polyether/Polyester PU	Cross-Linked EVA Copolymer	Modified Open-Cell PU	Vulcanized Natural Rubber
Long-Term Compression Set	Superior (<5% pack-out)	Moderate (Packs out over time)	Superior (<5% pack-out)	Good (<8%)
Airflow & Breathability	High (Open-cell matrix)	Zero (Closed-cell barrier)	Ultra-High (Retained open pore)	High (Pinhole core)
Cushioning Longevity	Excellent (>2 Years active use)	6 – 12 Months	>2 Years active use	1 – 2 Years (Ages with sweat)
Weight & Density	Medium-Light (40–120 kg/m³)	Ultra-Light (30–90 kg/m³)	Light (45–100 kg/m³)	Heavy (75–180 kg/m³)
Direct Textile Bonding	Chemical in-mold fusion	Requires glue/flame bond	In-mold adhesive fusion	Latex glue lamination
Primary Applications	Insoles, Seating, Midsoles	Outsoles, Midsoles, Mats	Performance Athletic Insoles	Mattresses, Luxury Pillows

Polyurethane Chemistry & Grades

Polyether vs. Polyester Polyurethane Formulations

We formulate both polyether and polyester polyol systems to match mechanical durability and environmental requirements:

Polyether-based PU

Superior hydrolytic stability, microbial resistance, and low-temperature flexibility. Ideal for moisture-prone athletic shoes, washable insoles, and medical seating.

Polyester-based PU

Exceptional tensile strength, tear resistance, and solvent/oil durability. The preferred chemistry for heavy-duty safety boot soles and industrial gaskets.

High-Resilience (HR) cold cure

Combines high SAG factor (comfort ratio >2.8) with instantaneous spring-back recovery for performance running footwear and executive seating.

Bio-based eco-polyol blends

Formulations incorporating up to 30% USDA-certified bio-based polyols derived from castor oil, reducing fossil carbon dependency.

Manufacturing Process

How We Manufacture Precision Polyurethane Foam

From automated raw material temperature conditioning to multi-station rotary pouring and CNC converting:

Polyol & MDI conditioning

Constant-temperature nitrogen-blanketed storage tanks ensuring precise stoichiometric mixing ratio control across Component A and Component B.

High-pressure reaction injection

Impactor mixing heads injecting reactive components at 150–200 bar into CNC aluminum molds preheated to 45–60°C.

In-mold foaming & post-cure

Controlled in-mold microcellular expansion and infrared post-curing tunnels guaranteeing complete polymer cross-linking.

Trimming, skiving & converting

Automated flash trimming, band-knife loop splitting, breathable perforated hole punching, and laser embossing.

OEM / ODM Customization

Complete Insole & PU Component Customization

We provide end-to-end design, rapid 3D prototyping, tooling fabrication, and mass manufacturing for global footwear brands:

3D CAD & mold development

Custom anatomical arch contours, deep heel cups, and multi-zone cushioning molds fabricated on 5-axis CNC machines.

Multi-density & dual-layer fusion

Dual-density injection fusing a firm supportive PU chassis with a cloud-soft memory foam or gel top layer in one unified shot.

Functional fabric lamination

Direct in-mold lamination with moisture-wicking CoolMax, anti-odor bamboo charcoal, silver-ion antibacterial, or velvet fabrics.

Custom branding & perforation

High-frequency heat transfers, laser-etched brand logos, arch ventilation channels, and retail blister packaging.

Quality Control & Testing

Quality Assurance & Standard Laboratory Testing

Every production lot is validated through exhaustive physical, dynamic biomechanics, and climate aging laboratory tests:

ASTM D3574 compression & rebound

Standardized ball rebound, IFD (indentation force deflection), and 75% constant deflection compression set verification.

100,000-cycle dynamic walking simulator

SATRA TM142 and biomechanical fatigue machines verifying permanent thickness retention and cushioning life.

Hydrolysis & climate chambers

Accelerated humidity exposure (70°C at 95% RH for 14 days) confirming zero polymer crumbling or loss of tensile properties.

VOC & odor emissions testing

Thermal desorption GC-MS laboratory testing certifying low amine odors and zero toxic chemical emissions.

Certifications & Compliance

International Standards & Factory Certifications

Our manufacturing facilities and polyurethane products comply with top global environmental and safety certifications:

ISO 9001 & ISO 14001

Certified international quality and environmental management systems governing all chemical handling and production.

OEKO-TEX Standard 100

Class I / Class II certification verifying zero harmful substances in direct contact with skin.

CertiPUR-US & RoHS 3

Certified free from ozone depleters, mercury, lead, heavy metals, formaldehyde, and phthalates.

SATRA Member & REACH SVHC

Member of SATRA Technology Centre and fully compliant with EU REACH candidate lists (0 SVHCs).

Packaging & Export

Export Packaging & Ocean Logistics Solutions

Protective moisture-sealed packaging engineered to prevent transit compression deformation and humidity exposure:

Bulk insole carton packing

Pairs packed in moisture-barrier PE inner bags and double-wall heavy corrugated export cartons with desiccant packs.

Retail-ready blister & box packaging

Custom color-printed cardboard boxes, hang-tag polybags, and retail blister cards with barcodes ready for shelf display.

Continuous roll & sheet palletization

Rolls wrapped in heavy PE film on 3-inch cores; master sheets flat-stacked on ISPM-15 heat-treated export pallets.

Multi-port shipping

Direct FCL/LCL ocean container loading from Xiamen (China), Jakarta (Indonesia), and Ho Chi Minh City (Vietnam).

Procurement Guide

What to Specify When Ordering Polyurethane (PU) Foam

To ensure rapid sampling and quotation, provide our engineering sales team with these primary project parameters:

Application & foam type

High-resilience insole (HR), slow-recovery memory foam, integral skin (ISF), or microcellular molded footwear system.

Density & hardness target

Target density (e.g. 55 kg/m³) and Shore C / Shore 00 hardness or IFD indentation load specification.

Format & 3D mold tooling

Molded finished insoles (send 3D STEP/IGES files), continuous rolls, or flat die-cut sheet dimensions.

Fabric & surface treatment

Fabric top-cloth type, color/Pantone, antibacterial/anti-odor treatment, perforations, or retail packaging specs.

Sustainability & ESG

Eco-Friendly Chemistry & Sustainable Manufacturing

Firefox Foam is committed to reducing environmental impact through clean chemical engineering and circular material recovery:

100% Water-blown technology

Clean water-based foaming reactions eliminating volatile solvent blowing agents and zero global warming potential (GWP=0).

Bio-based polyol integration

Commercial availability of eco-friendly polyol formulations utilizing renewable plant oils to reduce petroleum content.

Post-industrial PU recycling

Manufacturing trim and scrap foam are rebonded into high-density acoustic underlayments and sports padding.

Low VOC catalytic systems

Advanced non-fugitive reactive amine catalysts locked into the polymer matrix, eliminating post-production gas off-gassing.

Application Case Studies

Proven Performance Across Global OEM Footwear & Seating Programs

Discover how leading footwear and industrial brands partner with Firefox Foam to elevate product comfort and durability:

Global Marathon Running Footwear Brand

Challenge: Brand required an ultra-breathable insole delivering >62% energy return that wouldn't lose shape after 800 km of road running.
Solution: Custom molded open-cell polyether HR PU insole with targeted arch support and CoolMax lamination, achieving <3.5% thickness loss after 100k test cycles.

Heavy-Duty Work & Safety Boot Manufacturer

Challenge: Safety footwear brand faced insole hydrolysis degradation and foot fatigue complaints from workers in humid, hot industrial plants.
Solution: Hydrolysis-resistant dual-density polyether PU insole featuring an ergonomic shock-absorbing heel pod, boosting worker comfort ratings by 42%.

Premium Ergonomic Executive Seating

Challenge: Office chair maker needed molded seat cushions offering progressive pressure relief without permanent sag over 5 years of daily use.
Solution: High-resilience cold-cure molded PU cushions with a high SAG comfort factor of 3.0, passing BIFMA X5.1 commercial durability certification.

Technical Resources

Technical Documentation & Laboratory Test Reports

Complete laboratory documentation, safety datasheets, and certification records available for immediate download upon request:

High-Resilience (HR) PU Insole Technical Data Sheet (TDS)
Viscoelastic Memory Foam Rebound & Density Dossier
Integral Skin Polyurethane (ISF) Mechanical Test Report
ASTM D3574 Standard Test Method Verification Certificate
Hydrolysis & Accelerated Humidity Aging Test Report (SATRA TM)
Material Safety Data Sheet (MSDS) & REACH SVHC Compliance
In-Mold Fabric Lamination Adhesion & Peel Strength Data
Bio-Based Polyol Content Certification (USDA BioPreferred)

Frequently Asked Questions

Frequently Asked Questions About Polyurethane (PU) Foam

Detailed answers to technical, commercial, and engineering questions from footwear developers and procurement managers:

What is the key difference between PU foam and EVA foam for shoe insoles?

PU foam is an open-cell elastomer that retains over 95% of its original thickness and cushioning over years of use (compression set <5%) and allows continuous airflow. EVA is a closed-cell thermoplastic foam that is lighter and easier to thermoform but packs out (permanently flattens) under repeated walking pressure. For premium and performance footwear, PU delivers significantly longer-lasting comfort.

What is the difference between polyether and polyester PU foam?

Polyether-based PU provides outstanding hydrolytic stability (resistance to breakdown from water/sweat/humidity) and microbial resistance, making it ideal for athletic insoles. Polyester-based PU delivers higher mechanical tensile strength, tear resistance, and oil/fuel resistance, making it the top choice for heavy-duty safety boot soles and industrial components.

How do you prevent PU foam insoles from hydrolyzing (crumbling) in humid climates?

We formulate our footwear insoles using high-purity polyether polyols combined with specialized anti-hydrolysis stabilizers. Our products pass 14-day accelerated hydrolysis testing at 70°C and 95% relative humidity with zero loss in tensile strength or structural integrity.

What is High-Resilience (HR) PU foam and what rebound rate does it achieve?

High-resilience (HR) PU is a cold-cure polyurethane characterized by a random, open-cell structure that delivers high spring-back elasticity. Our HR insole formulations achieve ball rebound resilience rates between 55% and 68% with exceptional energy return.

Can you manufacture dual-density or multi-layer PU insoles?

Yes. We operate multi-station rotary pouring carousels capable of dual-shot injection molding (e.g. a firm supporting arch chassis combined with an ultra-soft cushioning forefoot/heel layer), as well as multi-layer lamination with memory foam, EVA, and gel inserts.

What fabrics can be laminated onto your PU foam insoles?

We support direct in-mold chemical bonding and hot-melt lamination with a wide variety of technical textiles, including breathable mesh, CoolMax, velvet, microfiber leather, bamboo charcoal, recycled PET fabrics, and anti-static ESD conductive cloths.

Is your polyurethane foam breathable and anti-odor?

Yes. Our open-cell PU foam features an interconnected micro-porous structure that allows air and moisture circulation. We can also integrate zinc-pyrithione, silver-ion, or activated charcoal additives into the polyol formulation for long-lasting antibacterial and anti-odor protection.

What density ranges do you manufacture for footwear and industrial PU foam?

We manufacture PU foams ranging from lightweight insole foams (35–90 kg/m³) and slow-recovery memory foams (45–110 kg/m³) up to high-density self-skinning parts (250–550 kg/m³) and microcellular footwear soles (280–650 kg/m³).

Can you create custom 3D insole molds based on our CAD drawings?

Yes. Our in-house tooling center uses 5-axis CNC machines to mill high-precision aluminum molds directly from your 3D CAD files (STEP, IGES, Rhino). Rapid prototype tooling takes 5–7 working days.

Does your PU foam contain harmful VOCs, formaldehyde, or heavy metals?

No. Our PU foam is 100% water-blown, free from CFCs/HCFCs, formaldehyde, phthalates, and heavy metals. All products comply with OEKO-TEX Standard 100, CertiPUR-US, RoHS 3, and EU REACH SVHC regulations.

What is your typical Minimum Order Quantity (MOQ) for custom PU insoles?

For custom molded PU insoles with existing or custom tooling, our standard MOQ is 1,000 to 3,000 pairs per style. For continuous rolls and flat sheet stock, MOQ starts from 500 square meters.

What is the sample dispatch lead time for custom prototypes?

Standard material swatches and stock insole samples are dispatched within 2–3 working days. Custom 3D mold opening and sample insole development take 7–10 working days.

What is the mass production lead time?

Standard mass production lead time is 15–22 working days after sample confirmation and deposit. High-volume container orders can be scheduled on recurring monthly supply agreements.

Can you ship PU foam components from factories outside of China?

Yes. Firefox Foam operates production bases in China, Indonesia, and Vietnam, allowing international brands to optimize logistics costs, reduce import tariffs, and secure flexible supply chains.

Can you supply retail-ready packaging with barcodes and branded blister cards?

Yes. We offer complete OEM packaging services, including custom-printed retail color boxes, blister cards, polybags with hang-tags, and master carton barcoding for direct fulfillment to retail distribution centers.

What is Integral Skin Polyurethane (ISF) foam?

Integral skin PU foam is a specialized reaction injection molded material that forms a tough, non-porous, wear-resistant outer skin over a lightweight cellular core in a single molding operation. It is commonly used for armrests, slides, steering wheels, and impact padding.

How does temperature affect your memory foam products?

Our viscoelastic memory foam is engineered with modified glass transition temperatures (Tg) to provide smooth pressure redistribution at human body temperature (36°C) while maintaining soft flexibility across cold winter and hot summer conditions.

How do you ensure hardness and thickness consistency across batches?

Our computerized high-pressure pouring lines automatically monitor raw material temperatures, injection pressures, and shot weights within ±1% tolerances, backed by automated hardness and IFD testing on every shift.

Can you supply bio-based or recycled content PU foam?

Yes. We supply eco-friendly formulations incorporating up to 20%–30% bio-based polyols derived from sustainable plant oils, as well as recycled PU composite underlayments for ESG-conscious brands.

How do we request free samples or initiate an OEM insole project?

Click "Request Free Samples" or email our technical sales team at info@firefoxfoam.com with your target density, 3D drawings, or shoe sample requirements.

Sample Development

Request PU Foam Sample Swatch Book

Get a comprehensive sample kit including HR insole foam, viscoelastic memory foam, integral skin samples, and technical datasheets.

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Engineering Collaboration

Custom Insole & Tooling Consultation

Developing a new athletic or orthopedic footwear program? Send us your 3D CAD files for immediate mold review and cost quotation.

Talk to an Engineer

Ready to Upgrade Your Insole & Cushioning Performance?

Partner with an Experienced PU Foam Manufacturer

Contact our engineering sales team today for material data sheets, custom insole prototypes, or factory-direct container quotes across China, Indonesia, and Vietnam.

Direct Factory Pricing 40+ Years Foam Expertise Fast Sample Dispatch (2–3 Days) OEKO-TEX & CertiPUR-US Certified

Request Factory Quote Email Us

Direct inquiry: info@firefoxfoam.com | +86-595-88888888

As one of the most experienced pu foam suppliers in China, we have world-leading production equipment and strong manufacturing capabilities. Please rest assured to wholesale customized pu foam from our factory. For price consultation, contact us.