PSU Powder (Polysulfone)
PSU powder is supplied in free-flowing form for membrane casting and coating applications. It offers good hydrolytic stability, transparency, and high-temperature performance for an amorphous engineering thermoplastic. Typical particle size is a fine powder cut for casting and coating use; grades and particle size are confirmed at time of quotation.
Tg ~185–190°CMelting / Softening Point
Fine PowderParticle Size Range
Custom Made-to-OrderGrade, Size & Quantity
WorldwideExport Shipping
PSU Powder — Grades & Specifications
Polysulfone (PSU) powder is supplied across a range of grades, particle sizes and morphologies. The options below are typical; specify your target values in the request form and we will confirm availability, lead time and pricing.
| Material | Polysulfone (PSU) |
|---|---|
| Category | High-Performance Engineering Plastic Powders |
| CAS number | 25135-51-7 |
| Melting / softening point | Amorphous polymer, no true melting point; Tg ~185–190°C |
| Particle size | Fine powder for casting and coating applications; cut confirmed per grade |
| Morphology | Fine casting/coating powder |
| Appearance | Transparent to amber/tan powder |
| Max. continuous service temperature | Approx. 150–160°C continuous |
| Typical applications | Membrane Filtration Media, Water Treatment Components, Medical Device Housings, Food Service Equipment Coating |
Applications by Industry
Membrane Filtration MediaPSU powder is solution-cast into ultrafiltration and dialysis membrane sheets and hollow fibers.
Water Treatment ComponentsPSU powder coatings protect hot-water system parts requiring long-term hydrolysis resistance.
Medical Device HousingsPSU powder is molded into reusable, sterilizable diagnostic and lab equipment housings.
Food Service Equipment CoatingPSU powder coats food-contact components tolerant of repeated commercial dishwashing.
Electrical Insulation PartsPSU powder coatings insulate circuit breaker and connector components at elevated temperature.
Battery Component CoatingPSU powder coats battery housing parts requiring dimensional stability and chemical resistance.
Particle Size & Mesh Conversion
Reference for converting between US mesh and microns/millimetres. Figures are nominal sieve openings and may vary slightly by standard.
| Mesh (US) | Micron (µm) | mm | Inch | Remarks |
|---|---|---|---|---|
| 3 | 6730 | 6.730 | 0.2650 | |
| 4 | 4760 | 4.760 | 0.1870 | |
| 5 | 4000 | 4.000 | 0.1570 | |
| 6 | 3360 | 3.360 | 0.1320 | |
| 7 | 2830 | 2.830 | 0.1110 | |
| 8 | 2380 | 2.380 | 0.0937 | |
| 10 | 2000 | 2.000 | 0.0787 | |
| 12 | 1680 | 1.680 | 0.0661 | |
| 14 | 1410 | 1.410 | 0.0555 | |
| 16 | 1190 | 1.190 | 0.0469 | |
| 18 | 1000 | 1.000 | 0.0394 | |
| 20 | 841 | 0.841 | 0.0331 | |
| 25 | 707 | 0.707 | 0.0278 | |
| 30 | 595 | 0.595 | 0.0234 | |
| 35 | 500 | 0.500 | 0.0197 | |
| 40 | 420 | 0.420 | 0.0165 | |
| 45 | 354 | 0.354 | 0.0138 | |
| 50 | 297 | 0.297 | 0.0117 | |
| 60 | 250 | 0.250 | 0.0098 | |
| 70 | 210 | 0.210 | 0.0083 | |
| 80 | 177 | 0.177 | 0.0070 | |
| 100 | 149 | 0.149 | 0.0059 | |
| 120 | 125 | 0.125 | 0.0049 | |
| 140 | 105 | 0.105 | 0.0041 | |
| — | 100 | 0.100 | 0.0039 | Sand |
| 170 | 88 | 0.088 | 0.0035 | |
| 200 | 74 | 0.074 | 0.0029 | |
| — | 70 | 0.070 | 0.0027 | |
| 230 | 63 | 0.063 | 0.0024 | Human hair |
| — | 55 | 0.055 | 0.00217 | |
| 270 | 53 | 0.053 | 0.0021 | |
| — | 50 | 0.050 | 0.00197 | |
| 325 | 44 | 0.044 | 0.0017 | |
| — | 40 | 0.040 | 0.00157 | |
| 400 | 37 | 0.037 | 0.0015 | |
| 550 | 25 | 0.025 | 0.00099 | |
| 625 | 20 | 0.020 | 0.00079 | |
| 1200 | 12 | 0.012 | 0.0005 | |
| 1250 | 10 | 0.010 | 0.000394 | |
| — | 7 | 0.007 | 0.000276 | |
| 2500 | 5 | 0.005 | 0.000197 | |
| 4800 | 3 | 0.003 | 0.000118 | |
| 5000 | 2.5 | 0.0025 | 0.000099 | Bacteria (approx.) |
| 12000 | 1 | 0.001 | 0.0000394 |
Information Required for Quotation
- Grade or type
- Particle size (micron or mesh)
- Morphology / form (spherical, irregular, granular, etc.)
- Quantity
- Application environment
- Required delivery country
Lead time depends on grade, particle size, quantity and processing requirements. Export availability can be reviewed based on destination country and material type. A Certificate of Analysis can be provided on request.
Request a Quote or Custom Order
Tell us your grade, particle size and quantity. We typically reply within one business day.
Frequently Asked Questions
What grades and particle sizes of PSU powder are available?
PSU (Polysulfone) powder is supplied with particle size and grade as follows: Fine powder for casting and coating applications; cut confirmed per grade Fine casting/coating powder. Other grades can be reviewed on request depending on your application and quantity.
What particle sizes can you supply?
Fine powder for casting and coating applications; cut confirmed per grade Mesh-based requirements are also accepted; a mesh-to-micron conversion reference is provided on the page.
Can PSU powder be made to custom specifications?
Yes. PSU powder is produced to order — grade, particle size, morphology and packaging can be customized to your specification. Select “Custom Order” in the request form and provide your target values.
What is the minimum order quantity (MOQ)?
Order quantity is flexible and small quantities and prototype requests are welcome. Please state your required quantity in the form for an accurate quotation.
Can you export and ship PSU powder internationally?
Yes, export inquiries are welcome. Availability and shipping are reviewed based on destination country, grade and quantity.
Do you provide a Certificate of Analysis (COA) or technical data?
A Certificate of Analysis and technical data can be provided on request for supplied lots.
Related Products
Request a Quote for PSU Powder
Send us your grade, particle size, quantity and application. We will review availability, quotation and lead time. Small quantities, prototypes and custom made-to-order specifications are welcome.