FDA-Compliant Polysulfone Film
Balancing high thermal resistance with unmatched cost-efficiency, DFPSU Film delivers a glass transition temperature ( 𝑇𝑔 、155℃) and continuous thermal performance at 155°C.
With an ultra-low moisture absorption rate of just 0.3%, 86.2% optical transparency, and 37 kV/mm dielectric strength, this FDA-compliant halogen-free film is the premier economical solution for food contact containers, hot liquid machinery seals, hydrogen fuel cell gaskets, and automotive electronics.
Product information
Published information supports preliminary product selection. Confirm the exact grade, dimensions, tolerances, documentation and application suitability with the quotation for your order.
Description
Sulfone Polymer Film Selection Guide: PSU vs. PPSU vs. PEI
| Property / Feature | PSU Film (DFPSU) | PPSU Film (DFPPSU) | PEI Film (DFPEI) |
| Moisture Absorption (23°C/50%RH) | 0.3% (Ultra-Low Swell) | 0.6% | 0.25% |
| Glass Transition Temp (𝑇𝑔) | 187°C | 220°C | 217°C |
| Light Transmittance | 86.2% (Clear Amber) | 86.8% | 85.6% |
| Food Contact Compliance | FDA Compliant (Ideal) | FDA Compliant | FDA Compliant |
| Relative Material Cost | Most Economical | Moderate | Moderate |
Property Datasheet Summary (Grade DFPSU)
| Parameter / Property | Test Standard | Technical Value |
| Thickness & Roll Width | — | 0.025–0.1mm (Width ≤ 1020mm) / 0.1–0.5mm (Width ≤ 1050mm) |
| Surface Textures | Visual | Polished/Matte , Matte/Velvet |
| Tensile Yield Strength (MD/TD) | ISO 527-3 | 70 MPa / 68 MPa |
| Elongation at Ultimate (MD/TD) | ISO 527-3 | 121% / 89% |
| Dielectric Strength / 𝐷ₖ | IEC 60243 / 60250 | 37 kV/mm / 𝐷ₖ = 3.1 (1MHz) |
| Thermal Shrinkage (150℃/30min) | ISO 11501 | MD 0.1% / TD 0.1% |
Key Application Solutions
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FDA Food Processing & Hot Liquid Machinery: High-clarity, BPA-free film for food contact containers, hot beverage machinery gaskets, and liquid pump seals.
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Hydrogen Fuel Cell Sealing Gaskets: Excellent chemical resistance and low moisture swell for cost-sensitive HT-PEM fuel cell stacks and electrolyzers.
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Automotive Sensors & Electrical Insulation: 37 kV/mm dielectric breakdown voltage for EV battery module insulation, sensor windows, and circuit barriers.
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Medical & Diagnostic Equipment: Resists hospital disinfectants and mild steam sterilization for diagnostic device packaging and fluidic covers.
Frequently Asked Questions
Q: Why choose PSU film instead of PPSU or PEI film?
A: PSU film is the most cost-effective option among high-temperature sulfone polymers. It provides excellent heat resistance (𝑇𝑔 = 187℃) and lower water absorption (0.3%) at a significantly lower price point, making it ideal for cost-sensitive food contact, automotive, and fuel cell applications.
Q: Is PSU film compliant for food contact applications?
A: Yes. DFPSU film is inherently halogen-free and FDA-compliant, offering high clarity and hot water resistance for food and beverage contact equipment.
Material overview
Understanding PPS (Polyphenylene Sulfide)
Why engineers use it
- Broad chemical resistance for many industrial fluids and process environments.
- Low moisture uptake and good dimensional stability.
- Useful electrical insulation and inherent flame-resistance characteristics.
- Reinforced grades can provide high stiffness and repeatable molded dimensions.
- Often offers a practical cost/performance position below PEEK.
Limits to consider
- Unfilled PPS can be relatively brittle and design details strongly affect impact performance.
- Glass or mineral reinforcement changes shrinkage, anisotropy and machining behavior.
- Oxidizing media and actual high-temperature chemicals still require compatibility review.
- Weld lines, sharp corners and molding orientation can become structural weak points.
- It should not be selected from chemical-resistance charts alone.
Grades and product forms
PPS is commonly supplied unfilled or reinforced with glass fiber, mineral filler, carbon fiber or combined systems. The filler package changes stiffness, movement, surface finish, conductivity and wear. Pellets suit volume molding, while sheet, rod or finished parts may be preferable for prototypes and lower-volume production.
Performance points to review
| Evaluation area | Why it matters | Information to provide |
|---|---|---|
| Temperature behavior | Useful performance under elevated or changing temperature | Continuous and peak temperature, cycle length and time at load |
| Mechanical response | Strength and stiffness must match the real part geometry | Load direction, stress level, impact and fatigue expectations |
| Environmental resistance | Fluids, cleaning agents and atmosphere can change service life | Chemical name, concentration, temperature and exposure time |
| Dimensional control | Tight-tolerance parts depend on both material and processing | Finished dimensions, tolerances and assembly conditions |
| Electrical or insulation needs | Electrical requirements may influence grade and thickness | Voltage, dielectric, conductivity or insulation target |
These are engineering discussion points, not guaranteed property values. Final acceptance criteria should be agreed for the selected grade, process and order.
Typical application directions
These examples show where the material may be evaluated. They do not replace a suitability review for the finished component.
Preparing a high-temperature printing project
Provide filament diameter, printer model, nozzle and chamber capability, drying method, build geometry, support strategy and annealing plan. A high-performance filament cannot compensate for a printer that lacks the necessary thermal control.
Where the application is critical, define what a successful trial looks like before material is ordered: dimensions after processing, visual condition, mechanical response, assembly fit or another measurable result.
When another material may be better
PEEK may be preferred when toughness or a broader high-temperature performance margin is required. PPS can be the more practical solution when chemical resistance, stiffness, repeatable molding and cost control are the central requirements.
We recommend sharing the current material and the reason it is being reconsidered. Cost, processability, supply form and inspection burden belong in the decision alongside technical performance.
Information needed for an accurate quotation
A useful RFQ reduces follow-up questions and helps us distinguish between a material request and a finished-part requirement.
| Product form | Raw material, stock shape, semi-finished blank or completed part |
|---|---|
| Dimensions | Nominal size, finished size and tolerances |
| Quantity | Trial quantity, first order and estimated annual demand |
| Application | Part function and current material, if any |
| Operating temperature | Continuous range, peak temperature and cycle duration |
| Environment | Chemicals, gases, moisture, pressure, vacuum or outdoor exposure |
| Mechanical duty | Load, speed, impact, wear and mating components |
| Documentation | Drawing revision, inspection, traceability or compliance needs |
| Printing setup | Printer, nozzle, chamber, build plate, drying and annealing capability |
Frequently asked questions
Can I request a sample or trial quantity?
Trial quantities can be discussed according to product form and availability. Tell us what you need to prove during the trial, the intended process and the expected production quantity if the test succeeds.
Do you provide a data sheet or material documentation?
Available documentation depends on the selected material and supply route. List the documents required by engineering, purchasing or quality when you inquire so they can be checked before quotation.
Can the grade be selected from a product name alone?
No. Similar product names can cover different grades, colors, fillers and processes. Selection should be based on the finished application, environment and required property balance.
Can you supply custom dimensions or finished parts?
Custom sizes, blanks or finished parts can be reviewed where appropriate. A drawing with tolerances, quantity and material requirement is the best basis for quotation.
How should we evaluate an alternative to our current material?
Share the current grade, the part’s service conditions and the reason for changing it. A useful comparison looks at failure mode, processing, life, inspection and total project cost—not only a single property value.
What determines lead time?
Lead time depends on product form, grade, size, quantity, documentation, machining and current availability. Confirm the required delivery date and destination with the RFQ rather than assuming a standard schedule.
Send the drawing, application and quantity. We will use the project details to prepare a practical material and supply discussion.
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