PES ESD (ESD / conductive compound)
Grade
ASTM D5205 · also Ultrason E
Choose for wafer-handling, cleanroom and electronics fixtures needing controlled surface resistivity at high temperature.
Values for the ESD condition
Other PES grades and fills
PES is listed in 8 conditions; see the grade overview at PES.
Compare all 8 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Bearing / lubricated grade | Use for high-temperature dry-running bushings, thrust washers and slide elements. | 70 | 70 | 12 | 84 Shore D |
ESDThis page ESD / conductive compound | Choose for wafer-handling, cleanroom and electronics fixtures needing controlled surface resistivity at high temperature. | 75 | 75 | 8 | 87 Shore D |
Membrane grade | Solution-grade high-molecular-weight PES powder dissolved in NMP/DMAc to cast UF, MF, dialysis and RO support membranes. | 85 | 85 | 60 | 86 Shore D |
10 % glass-fibre reinforced | Light reinforcement when moderate stiffness gain is needed with less warpage than GF30. | — | 105 | 5 | — |
20 % glass-fibre reinforced | Balanced stiffness/toughness grade for structural housings and hot-water manifolds. | — | 125 | 3.5 | 92 HRM |
30 % glass-fibre reinforced | Highest-stiffness standard grade for load-bearing high-temperature parts and metal replacement. | — | 140 | 2.7 | 95 HRM |
40 % glass-fibre reinforced | Maximum stiffness and minimum CTE for precision high-temperature structural mouldings. | — | 155 | 2.2 | — |
30 % carbon-fibre reinforced | Pick when maximum specific stiffness, low CTE and static-dissipative behaviour are required. | — | 175 | 1.6 | — |
What is PES ESD?
PES ESD is PES in the ESD grade — choose for wafer-handling, cleanroom and electronics fixtures needing controlled surface resistivity at high temperature. PES ESD has a yield strength of 75 MPa (10.9 ksi) and a tensile strength of 75 MPa (10.9 ksi) — stronger than 84% of polymer grades. Elongation at break is 8% and the elastic modulus is 3.4 GPa (0.493 Msi). PES ESD has a density of 1.42 g/cm³ (0.0513 lb/in³), heavier than 83% of polymer grades. Its glass-transition temperature is 225°C (437 °F).
Advantages
- High service temperature — 180°C (356 °F), better than 85% of polymer grades
- High strength — 75 MPa (10.9 ksi), better than 84% of polymer grades
- Stiff — 3.4 GPa (0.493 Msi), better than 82% of polymer grades
- Low, predictable mold shrinkage — 0.4%, better than 82% of polymer grades
- Conducts heat well — 0.28 W/m·K (0.162 BTU/hr·ft·°F), better than 79% of polymer grades
Limitations
- Heavy — 1.42 g/cm³ (0.0513 lb/in³), worse than 83% of polymer grades
- High embodied carbon — 8 kg CO₂/kg, worse than 83% of polymer grades
- Degrades in UV without stabilisers — 25/100, worse than 76% of polymer grades
- Limited formability — 18/100, worse than 76% of polymer grades
PES ESD properties
Typical room-temperature values for PES ESD; 29 are specific to this condition. Other listed values are PES reference data and may not represent this condition. Bars are the position among polymer grades.
Physical6
PES ESD has a density of 1.42 g/cm³ (0.0513 lb/in³), heavier than 83% of polymer grades. Its glass-transition temperature is 225°C (437 °F).
Mechanical17
PES ESD has a yield strength of 75 MPa (10.9 ksi) and a tensile strength of 75 MPa (10.9 ksi) — stronger than 84% of polymer grades. Elongation at break is 8% and the elastic modulus is 3.4 GPa (0.493 Msi).
Thermal11
PES ESD is rated for continuous service to 180°C (356 °F). It conducts heat at 0.28 W/m·K (0.162 BTU/hr·ft·°F), better than 79% of polymer grades. Thermal expansion is 55 µm/m·K (30.6 µin/in·°F).
Electrical7
PES ESD is an electrical insulator with a dielectric strength of 16 kV/mm (406.4 V/mil) and a resistivity of 10,000 Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (80/100), worse than 52% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of PES ESD takes about 145 MJ of energy and emits 8 kg of CO₂ — more than 83% of polymer grades. Typical recycled content is 0%.
Manufacturability8
PES ESD's machinability is good (60/100, better than 51% of polymer grades); weldability poor (25/100); formability poor (18/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PES ESD
Is PES easy to machine?
Machines cleanly with sharp carbide, high speed and light feeds; use air or water-soluble coolant only (avoid chlorinated/ketone fluids) and anneal at ~190 °C before and after heavy cuts to prevent stress cracking.
Can PES be welded?
Joins well by ultrasonic, hot-plate, IR and vibration welding, plus solvent bonding with NMP/DMAc-based cements; glass-filled grades give lower weld-line strength.
Can PES be formed, bent or molded?
Dry to <0.02 % moisture (150 °C, 3–4 h), mould at 340–380 °C melt with 140–180 °C tools, generous gates and slow injection; thermoforming of sheet at 240–280 °C is practical.
What surface finishes work on PES?
Accepts printing, painting and vacuum metallising after plasma or primer treatment; unstabilised parts yellow under UV, so use topcoats or UV-shielding paint for outdoor service.
PES chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| glass fiber0 in default grade; 10–40 % in GF variants | 0 – 40 | 0 |
| carbon fiberCF and ESD variants only | 0 – 30 | 0 |
| PTFE / graphite lubricantbearing grades only | 0 – 20 | 0 |
| poly(oxy-1,4-phenylenesulfonyl-1,4-phenyAmorphous polyarylethersulfone, typically from bisphenol S / 4,4'-dichlorodiphenyl sulfone polycondensation; unfilled grade | balance | — |
PES ESD — frequently asked
What is PES ESD used for?
PES ESD is typically used for dialysis and filtration membranes, medical device housings, aircraft cabin parts and electrical insulators. In short: high-Tg transparent sulfone; steam- and radiation-resistant; membrane-casting resin.
What is the yield strength of PES ESD?
PES ESD has a typical yield strength of 75 MPa (10.9 ksi) and a tensile strength of 75 MPa (10.9 ksi) — stronger than 84% of polymer grades. Strength varies by condition: see the 8 listed tempers.
Is PES ESD easy to machine?
Reasonably — machinability is rated good (60/100, better than 51% of polymer grades). Machines cleanly with sharp carbide, high speed and light feeds; use air or water-soluble coolant only (avoid chlorinated/ketone fluids) and anneal at ~190 °C before and after heavy cuts to prevent stress cracking.
Can PES ESD be welded?
Not readily — weldability is rated poor (25/100). Joins well by ultrasonic, hot-plate, IR and vibration welding, plus solvent bonding with NMP/DMAc-based cements; glass-filled grades give lower weld-line strength.
What surface finishes work on PES ESD?
Accepts printing, painting and vacuum metallising after plasma or primer treatment; unstabilised parts yellow under UV, so use topcoats or UV-shielding paint for outdoor service.
Can PES ESD be formed, bent or molded?
Dry to <0.02 % moisture (150 °C, 3–4 h), mould at 340–380 °C melt with 140–180 °C tools, generous gates and slow injection; thermoforming of sheet at 240–280 °C is practical.
What is the maximum service temperature of PES ESD?
PES ESD is rated for continuous use to about 180°C (356 °F), and briefly to 220°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Ultrason E (PES) product brochure and processing guide — BASF (2023)
- Veradel PESU / Radel resins design guide — Solvay Specialty Polymers (2022)
- Sumikaexcel PES technical data — Sumitomo Chemical (2021)
- TECASON E (PESU) stock shape datasheet — Ensinger (2023)
- CAMPUS plastics database, PESU entries (ISO 10350 sets) — CWFG / CAMPUS consortium (2024)
- Engineered Materials Handbook Vol. 2: Engineering Plastics — ASM International (1988)
- ISO 527 / ISO 75 / ISO 306 / UL 94 test methods — ISO / UL (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.