High Quality Custom PEEK Washer High Temperature Resistant Insulating PEEK Gasket

Beschrijving

What Are PEEK Washers?

PEEK washers are flat, ring-shaped sealing or spacing components manufactured from Polyether Ether Ketone (PEEK), a high-performance thermoplastic polymer. These washers are engineered to function in extreme environments where traditional metal or standard plastic washers would fail. PEEK offers an exceptional combination of properties, including very high thermal stability, outstanding chemical resistance, excellent mechanical strength, low moisture absorption, and inherent lubricity. They are used as insulating spacers, wear pads, seals, and load-distribution elements in demanding applications.

Materials

The primary material for these washers is Polyether Ether Ketone (PEEK), which is often supplied in various grades to enhance specific properties:

• Virgin PEEK (Unfilled): The base polymer offering the full range of PEEK’s excellent properties, including high purity and good chemical resistance.

• Glass-Filled PEEK (e.g., 30% Glass): Reinforced with glass fibers to significantly increase stiffness, dimensional stability, and compressive strength.

• Carbon-Filled PEEK (e.g., 30% Carbon): Reinforced with carbon fibers to provide superior strength, stiffness, wear resistance, and thermal conductivity.

• PTFE-Filled PEEK: Blended with Polytetrafluoroethylene to further enhance its already low friction coefficient and wear resistance for bearing applications.

Surface Treatments

PEEK washers are typically used in their manufactured, as-molded or machined state, as the polymer itself provides the required surface properties. However, some post-processing can be applied:

• Machining/Finishing: Precise CNC machining or grinding to achieve tight dimensional tolerances and specific surface finishes.

• Cleaning: Ultrasonic or solvent cleaning to remove machining oils or contaminants for high-purity applications (e.g., semiconductor, medical).

• Surface Etching (Rare): In some cases, for improved adhesion if the washer is to be bonded.

Specifications

Key specifications for PEEK washers are defined by their geometry, material grade, and performance tolerances:

• Dimensions: Inner Diameter (ID), Outer Diameter (OD), and Thickness. Available in standard AS568 or metric sizes, or custom-machined to precise specifications.

• Material Grade: Specified as Virgin, Glass-Filled, Carbon-Filled, or PTFE-Filled.

• Tolerance Class: Precision-machined washers hold tight tolerances on ID, OD, and thickness (e.g., +/- 0.05mm).

• Temperature Rating: Continuous service temperature typically up to 250°C (480°F).

• Pressure/Vacuum Rating: Capable of functioning in high-pressure or vacuum systems due to low outgassing and creep resistance.

Application Fields

PEEK washers are critical in industries that operate at the extremes of temperature, pressure, and chemical exposure:

• Aerospace: Used in engine components, fuel systems, and airframe assemblies for their lightweight, high-strength, and flame/smoke/toxicity (FST) compliance.

• Semiconductor Manufacturing: As insulating spacers and seals in wafer processing equipment, where high purity and resistance to aggressive plasma chemistries are mandatory.

• Oil & Gas (Downhole Tools): As sealing and insulating components in drilling and logging equipment that faces high temperatures, extreme pressures, and corrosive fluids.

• Medical Devices: In sterilizable, implantable, or diagnostic equipment due to biocompatibility (ISO 10993 compliant grades), steam autoclavability, and chemical resistance.

• Food & Beverage Processing: For wear plates and seals in high-temperature cleaning systems.

• High-Performance Automotive: In transmission systems, turbochargers, and sensors under the hood.

• Chemical Processing: As gaskets and seals for pumps and valves handling corrosive fluids.

Excellent Case: Semiconductor Plasma Etch Chamber

A manufacturer of semiconductor etching equipment faced recurrent failures with the ceramic insulating washers inside its plasma etch chambers. These washers were cracking under cyclic thermal stress and were being attacked by the highly corrosive fluorine-based plasma. The solution was to replace them with precision-machined washers made from 30% glass-filled PEEK. The PEEK washers provided exceptional resistance to the aggressive chemical environment and could withstand the rapid thermal cycles from 25°C to over 200°C without degrading or cracking. Their inherent electrical insulation properties were maintained, preventing arcing. This substitution increased the mean time between failures (MTBF) for the chamber by over 300%, drastically reducing tool downtime, maintenance costs, and wafer scrap for the chip manufacturer.