Petrochemical
High-temperature/pressure pump & compressor shaft seals; crude-oil erosion resistant. Verified service life > 12,000 h at 180 °C / 20 MPa.
Core Performance & Technical Parameters
| Property | Value | Test Standard / Condition |
|---|---|---|
| Continuous Operating Temperature | −60 °C ~ +260 °C | UL 746B (RTI, Mechanical with Impact) |
| Peak Temperature (short-term, < 5 min) | +300 °C | Intermittent, non-loaded |
| Static Pressure Capacity | ≤ 40 MPa | Radial clearance ≤ 0.05 mm, 23 °C |
| Dynamic Pressure Capacity | ≤ 25 MPa | v ≤ 10 m/s, lubricated |
| Linear Velocity | ≤ 15 m/s (standard) · ≤ 20 m/s (CF-reinforced) | Internal PV chart, correlated with ISO 6194-1 |
| Friction Coefficient — Pure PEEK | 0.34 – 0.40 (dry) · 0.10 – 0.15 (lubricated) | ASTM D3702, pin-on-disc |
| Friction Coefficient — 30 % CF PEEK | 0.15 – 0.20 (dry) · 0.08 – 0.12 (lubricated) | ASTM D3702, pin-on-disc |
| Tensile Strength — Pure PEEK | ≥ 95 MPa | ISO 527-2, 23 °C, 5 mm/min |
| Tensile Strength — 30 % CF PEEK | ≥ 210 MPa | ISO 527-2, 23 °C, 5 mm/min |
| Compressive Creep (24 h @ 150 °C, 10 MPa) | ≤ 3 % | ISO 899-2 / ASTM D621 |
| Hardness (bulk material) | Rockwell M99 (Scale M) | ISO 2039-2 / ASTM D785 |
| Mating Shaft Surface Hardness (required) | ≥ HRC 45 | Applies to counter-face, not to the seal |
| Chemical Resistance | Resistant to dilute H₂SO₄ (≤ 40 %) at 23 °C, dilute bases, hydrocarbons, steam & 200+ industrial media | ISO 175, 30 d immersion |
| Dimensional Range | Shaft Ø 10 – 300 mm · Groove depth 1.5 – 8 mm | Tolerance grade h8 / h9 |
Note: Concentrated H₂SO₄ (≥ 95 %) and oleum will attack the PEEK backbone at elevated temperature — contact engineering for chemistry-specific validation.
Application Fields
Semiconductor
Ultrapure water & CVD equipment. Low-outgassing grade per SEMI F57; extractable ionic content < 1 ppb; compatible with ISO 14644-1 Class 4 environments.
Food & Pharma
Compliant with FDA 21 CFR 177.2415, EU 10/2011 and NSF/ANSI 51. Suitable for aseptic filling machines and bioreactor shaft ends.
Aerospace
Hydraulic actuators and fuel-pump shaft seals; qualified through −60 °C ~ +260 °C thermal-cycle tests per MIL-G-5514G and SAE ARP 1383.
New Energy
Critical sealing component for lithium-battery electrolyte transfer pumps and hydrogen fuel-cell circulation loops.
Common Failure Modes & Remedies
Leakage
Causes: Stretch > 15 %, roughness > Ra 0.8 µm, particulates > 50 µm.
Remedies: Verify h8/h9 tolerance, polish to Ra 0.4 – 0.6 µm, install ≤ 25 µm filter upstream.
Thermal Overload
Causes: Dry-run > 280 °C, compression > 25 %, cooling loss.
Remedies: Adjust compression to 15 – 20 %, inspect lubricant, restore cooling flow.
Extrusion Damage
Causes: Radial clearance > 0.5 mm combined with frequent pressure surges.
Remedies: Reduce clearance to < 0.2 mm, add anti-extrusion back-up ring.
Essential Procurement Parameters
- Shaft diameter & tolerance grade (e.g. Ø 50 h8)
- Seal groove dimensions (ID × OD × depth)
- Working media, temperature range and pressure
- Operating linear velocity & motion type (reciprocating / rotational)
- Certification requirements (FDA / ATEX / USP Class VI)
Selection Prerequisites: Counter-face roughness ≤ Ra 0.8 µm · Mating shaft hardness ≥ HRC 45 · Chamfer 0.3 × 45°. Engineering response within 24 hours.
Frequently Asked Questions
Q1 · PEEK vs. traditional rubber seals?
PEEK operates continuously from −60 °C to +260 °C, retains structural strength under aggressive chemistry (e.g. dilute H₂SO₄, 200+ media), and exhibits roughly one-tenth the compressive creep of fluoroelastomers, delivering 3 – 5× the mechanical strength.
Q2 · Pure PEEK vs. 30 % Carbon-Fiber reinforced?
Pure PEEK suits low-speed service (< 10 m/s) where toughness is critical. 30 % CF-PEEK offers ~40 % higher rigidity, ~3× wear resistance and higher tensile strength (≥ 210 MPa), ideal for high-speed rotation and elevated PV loads.
Q3 · Can the seal withstand pressure shocks?
Yes. Instantaneous surges up to 1.5× working pressure (< 100 ms) are tolerated, provided the peak stays below the static 40 MPa limit. For repeated shocks (> 10 events/min), a hydraulic accumulator is recommended to protect the seal lip.
Q4 · Cost-effectiveness versus imported brands?
Dalian Allstar Material delivers Victrex-/Solvay-grade performance at 60 – 70 % of imported cost, with ~50 % shorter lead time and localised 24-hour engineering support.
Looking for Custom PEEK Sealing Solutions?
Contact our technical team today for a professional quote and technical support.