PPS · grade
PPS Bearing Grade
Properties of the Bearing Grade condition, compared with the other PPS grades.
Pick for unlubricated sliding parts — bushings, wear pads, seal faces, thrust washers — running hot or in aggressive fluids.
What is PPS Bearing Grade?
PPS Bearing Grade is PPS in the Bearing Grade grade — pick for unlubricated sliding parts — bushings, wear pads, seal faces, thrust washers — running hot or in aggressive fluids. PPS Bearing Grade has a yield strength of 75 MPa (10.9 ksi) and a tensile strength of 85 MPa (12.3 ksi) — stronger than 83% of polymer grades. Elongation at break is 2% and the elastic modulus is 6.5 GPa (0.943 Msi). PPS Bearing Grade has a density of 1.45 g/cm³ (0.0524 lb/in³), heavier than 85% of polymer grades. Its glass-transition temperature is 88°C (190 °F). Unfilled is the default condition FabDigit quotes; Bearing Grade is available on request or by drawing note.
Advantages
- Conducts heat well — 0.45 W/m·K (0.26 BTU/hr·ft·°F), better than 97% of polymer grades
- Good corrosion resistance — 92/100, better than 91% of polymer grades
- Stiff — 6.5 GPa (0.943 Msi), better than 89% of polymer grades
- High service temperature — 220°C (428 °F), better than 89% of polymer grades
- Low moisture uptake — 0.03%, better than 88% of polymer grades
Limitations
- Limited ductility — 2%, worse than 94% of polymer grades
- Heavy — 1.45 g/cm³ (0.0524 lb/in³), worse than 85% of polymer grades
- Limited formability — 15/100, worse than 80% of polymer grades
PPS Bearing Grade properties
Typical room-temperature values for PPS Bearing Grade — 15 properties are specific to this condition; the rest are grade-level values shared by every PPS grade. Each bar shows where the value sits among the polymer grades in FabDigit's library — further right is higher.
Physical5
PPS Bearing Grade has a density of 1.45 g/cm³ (0.0524 lb/in³), heavier than 85% of polymer grades. Its glass-transition temperature is 88°C (190 °F).
Mechanical15
PPS Bearing Grade has a yield strength of 75 MPa (10.9 ksi) and a tensile strength of 85 MPa (12.3 ksi) — stronger than 83% of polymer grades. Elongation at break is 2% and the elastic modulus is 6.5 GPa (0.943 Msi).
Thermal10
PPS Bearing Grade is rated for continuous service to 220°C (428 °F). It conducts heat at 0.45 W/m·K (0.26 BTU/hr·ft·°F), better than 97% of polymer grades. Thermal expansion is 30 µm/m·K (16.7 µin/in·°F).
Electrical7
PPS Bearing Grade is an electrical insulator with a dielectric strength of 18 kV/mm (457.2 V/mil) and a resistivity of 100 Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 91% of polymer grades. UV resistance is fair.
Sustainability4
Producing a kilogram of PPS Bearing Grade takes about 115 MJ of energy and emits 6.2 kg of CO₂ — more than 70% of polymer grades. Typical recycled content is 2%.
Manufacturability7
PPS Bearing Grade's machinability is good (62/100, better than 59% of polymer grades); weldability poor (30/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other PPS grades and fills
PPS is also supplied in 6 other conditions. The full side-by-side table is on the PPS overview.
- UnfilledDefaultPick when machining stock shapes, when isotropic shrinkage and low abrasiveness matter, or for thin dielectric parts; accept low stiffness and low impact.78 MPa tensile
- CF30Use where high specific stiffness, low CTE, static dissipation or fuel/EMI-related conductivity is required.195 MPa tensile
- GF40Highest-strength/stiffness standard grade for structural under-hood, pump and valve parts; most anisotropic warpage and most abrasive to tooling.190 MPa tensile
- GF30The general-purpose reinforced injection grade: good balance of strength, toughness and flow for connectors, pump housings and covers.150 MPa tensile
- GF65 (Mineral)Choose for maximum dimensional stability, lowest shrinkage/warpage and lowest cost per litre in encapsulation, bobbins and precision electrical housings.130 MPa tensile
- GF30-IMChoose when snap-fits, press-fit inserts, thermal shock or vibration would crack standard brittle PPS, at the cost of stiffness and HDT.120 MPa tensile
- Bearing GradePick for unlubricated sliding parts — bushings, wear pads, seal faces, thrust washers — running hot or in aggressive fluids.85 MPa tensile
Working with PPS Bearing Grade
Is PPS easy to machine?
Machines like a rigid, notch-sensitive thermoplastic — use sharp polished-flute carbide (PCD for glass/mineral-filled), high speed, light feed, air or mist cooling, and generous radii to avoid chipping.
Can PPS be welded?
No solvent bonding; join by ultrasonic, IR/hot-plate, laser or spin welding with matched fillers, or use epoxy adhesive after plasma/flame surface activation.
Can PPS be formed, bent or molded?
Dry 3 h at 150 °C, mold at 310–330 °C melt with 130–150 °C tool for full crystallinity; hardened, wear-resistant tool steel and vented gates are mandatory because glass-filled PPS is very abrasive and outgasses.
What surface finishes work on PPS?
Accepts pad printing, laser marking and vacuum metallizing; needs plasma or corona pre-treatment for paint adhesion, and unfilled grades polish to a semi-gloss but darken under UV.
PPS 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 fiberchopped E-glass in reinforced grades (GF30/GF40) | 0 – 40 | 0 |
| mineral filler (CaCO3 / talc / wollastonused with glass in 65% total-filler grades | 0 – 45 | 0 |
| carbon fiberconductive / high-stiffness grades | 0 – 30 | 0 |
| PTFE / graphite / MoS2bearing and wear grades | 0 – 20 | 0 |
| pigment, nucleant, coupling agent, heat typical additive package | 0 – 3 | 1 |
| poly(1,4-phenylene sulfide) resinrepeat unit (C6H4S)n; polymerized from p-dichlorobenzene and sodium sulfide in NMP | balance | — |
PPS Bearing Grade — frequently asked
What is PPS Bearing Grade used for?
PPS Bearing Grade is typically used for pump housings and impellers, valve seats, electrical connectors, coil bobbins, automotive under-hood components and airflow sensor housings. In short: strong chemical resistant.
What is the yield strength of PPS Bearing Grade?
PPS Bearing Grade has a typical yield strength of 75 MPa (10.9 ksi) and a tensile strength of 85 MPa (12.3 ksi) — stronger than 83% of polymer grades. Strength varies by condition: see the 7 listed tempers.
Is PPS Bearing Grade easy to machine?
Reasonably — machinability is rated good (62/100, better than 59% of polymer grades). Machines like a rigid, notch-sensitive thermoplastic — use sharp polished-flute carbide (PCD for glass/mineral-filled), high speed, light feed, air or mist cooling, and generous radii to avoid chipping.
Can PPS Bearing Grade be welded?
Not readily — weldability is rated poor (30/100). No solvent bonding; join by ultrasonic, IR/hot-plate, laser or spin welding with matched fillers, or use epoxy adhesive after plasma/flame surface activation.
What surface finishes work on PPS Bearing Grade?
Accepts pad printing, laser marking and vacuum metallizing; needs plasma or corona pre-treatment for paint adhesion, and unfilled grades polish to a semi-gloss but darken under UV.
Can PPS Bearing Grade be formed, bent or molded?
Dry 3 h at 150 °C, mold at 310–330 °C melt with 130–150 °C tool for full crystallinity; hardened, wear-resistant tool steel and vented gates are mandatory because glass-filled PPS is very abrasive and outgasses.
What is the maximum service temperature of PPS Bearing Grade?
PPS Bearing Grade is rated for continuous use to about 220°C (428 °F), and briefly to 260°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in PPS Bearing Grade?
Yes — PPS Bearing Grade is available for CNC machining, sheet metal and injection molding with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- Fortron PPS product and processing data — Celanese (2023)
- Ryton PPS compounds datasheets — Solvay Specialty Polymers (2022)
- Techtron / Techtron HPV PPS stock shapes — Mitsubishi Chemical Advanced Materials (2022)
- CAMPUS plastics database — PPS ISO 10350 datasets — CWFG / CAMPUS consortium (2023)
- Engineered Materials Handbook Vol. 2: Engineering Plastics — ASM International (1988)
- ISO 527 / ISO 178 / ISO 75 / ASTM D256 / UL 94 test methods — ISO / ASTM / UL (2019)
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.