Gray PSU/PPSU | Food-Grade High-Heat Resin
Safety-Certified. Heat-Stable. Aesthetic Consistency.
Our Food-Grade Gray PSU & PPSU resins are engineered for demanding contact applications.
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Compliance:Â BPA-Free, FDA & NSF compliant.
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Forms:Â Pellets, Rods, Sheets, and Precision Parts.
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Performance:Â Unmatched hydrolysis resistance; survives 1000+ steam cycles.
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Security:Â NDA support for custom parts and color-matching.
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Inquiry? Technical datasheet and quote ready in 24 hours.
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
I. Performance Spectrum: PSU vs. PPSUÂ
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Gray PSU (The Aesthetic Standard): Offers amber-transparent base with high-heat resistance up to 150°C. Excellent for food-service components requiring high rigidity and cost-effective durability.
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Gray PPSU (The Durability Peak): The ultimate solution for repeated sterilization. Maintains impact strength and color integrity even after indefinite exposure to boiling water and high-pressure steam (180°C+).
II. Why “Gray” Matters?Â
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Uniform Pigmentation: We use medical-grade pigments to ensure zero-streak color uniformity. Every batch is color-checked to prevent lot-to-lot shifts in your final injection-molded parts.
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Stain Resistance: Specifically formulated to resist staining from coffee, tea, and oils—crucial for commercial food equipment and consumer appliances.
III. Full-Spectrum Supply ChainÂ
We don’t just sell resin; we provide a complete manufacturing loop:
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Resin Granules:Â Optimized flow rates for high-speed injection molding and extrusion.
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Stock Shapes:Â Stress-relieved Rods and Sheets for prototyping or small-batch production.
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CNC Machined Parts: In-house precision machining of manifolds, valve bodies, and connectors with micron-level tolerances.
IV. Strategic Industry ApplicationsÂ
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Commercial Beverage:Â Professional coffee machine brewing groups, manifolds, and steam wands.
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Dairy & Food Processing:Â Fittings, dairy equipment components, and catering inserts.
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Medical & Lab:Â Surgical tool handles and sterilization trays requiring a distinctive gray aesthetic.
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Baby Care:Â Premium, durable feeding components (BPA-free/Phthalate-free).
V. Engineering Trust & Data Support
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NDA Protected:Â We protect your proprietary mold designs and custom formulations under strict Non-Disclosure Agreements.
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Quality Documents: Full batch traceability with TDS, COA, and RoHS/REACH certifications provided as standard.
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Drop-in Replacement: Our grades are designed to be seamless equivalents to branded resins like Radel® and Udel®, minimizing re-tooling costs.
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 pellet or granule project
State whether the resin will be injection molded, compression molded, extruded, compounded or used in process development. Include machine capability, part thickness, mold concept, drying and handling plan, color, filler or additive needs, and the property the finished part must retain. For an unfamiliar resin, a controlled trial lot is more useful than moving directly to production volume.
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 | Pellets or granules; natural, black or another required color |
|---|---|
| Grade direction | Unfilled, reinforced, modified or application-specific requirement |
| 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 |
| Conversion process | Molding, extrusion, compounding, sintering or development work |
| Packaging | Trial pack, production packaging and moisture-control expectations |
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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