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Precision Machining of High-Performance Engineering Plastics
Accumatics offers a service to carry pre-machined bar stock in our warehouse to decrease overall lead times for our customers. Specializing in PEEK and PTFE, we carry a variety of materials in multiple sizes to cut down on lead times. In eliminating the material sourcing process, we can see lead times shorten to anywhere between a few days to a few weeks before you receive parts.
Rod
ABS
Acetal
Acrylic
HDPE
UHMW-PE
PTFE
Filled PTFE
Modified Grade PTFE (TFM)
Delrin
Delrin AF Blend
Nylon
PCTFE
PEEK
Filled PEEK
Ultem
Polyethylene
PVC Type 1
PVC Type 2
PVDF
Torlon
PFA
Nylon
Polypropylene
Rod
Tube
Acetal
Delrin
Delrin AF Blend
HDPE
UHMW-PE
Nylon
PEEK
Filled PEEK
PTFE
Filled PTFE
Modified Grade PTFE
Polyethylene
Polypropylene
Ultem
Acetron GP
Nylon
Torlon
PVC Type 1
PVC Type 2
PCTFE
Tube
Sheet
ABS
Acetal
Acrylic
Delrin
Delrin AF Blend
HDPE
UHMW-PE
Nylon
PCTFE
Polypropylene
PPS
PTFE
PVC Type 1
PVC Type 2
PVDF
PEEK
PFA
Sheet
Materials and Application Selector
Learn more about the following materials here:
Properties | PEEK | Glass-Filled PEEK | PTFE | Modified PTFE | Glass-Filled PTFE | Carbon-Filled PTFE | PFA | PCTFE | PVDF | Ultem (PEI) | Acetal (Delrin) | Nylon |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Machinability | Excellent | Very Good | Moderate | Moderate | Moderate | Moderate | Moderate | Very Good | Good | Good | Excellent | Good |
Moisture Absorption | Very Low | Very Low | None | None | None | None | None | Near Zero | Very Low | Low | Low | High |
Dimensional Stability | Excellent | Excellent | Moderate | Improved | Improved | Excellent | High | Exceptional | High | Very High | Excellent | Moderate |
Friction Coefficient | Low | Moderate | Ultra-Low | Low | Low | Low (but higher than PTFE) | Low | Low | Moderate | Moderate | Low | Moderate |
Wear Resistance | Excellent | Exceptional | Poor | Improved | Very Good | Excellent | Moderate | Very Good | Good | Good | Good | Good |
Chemical Resistance | Excellent | Excellent | Outstanding | Excellent | Excellent | Excellent | Outstanding | Excellent | Excellent | Good | Moderate | Moderate |
Max Temp (°F) | 480 | 500+ | 500 | 500 | 500 | 500 | 500 | 300 | 300 | 340 | 185 | 220 |
Strength | Very High | Extremely High | Low | Moderate | Moderate | Moderate-High | Moderate | High | Moderate | High | High | Moderate |
Application | Best Material | Why |
|---|---|---|
Electrical / high-temp applications | Ultem (PEI) | Thermal + electrical stability |
Cost-efficient components | Acetal / Nylon | Machinability + cost balance |
Tight tolerance machining | PEEK / PCTFE / Acetal | Dimensional control |
Semiconductor / high purity | PFA / PVDF | Clean fluid handling |
Cryogenic valve sealing | PCTFE | Dimensional stability + low moisture |
Extreme chemical exposure | PTFE / PFA | Broadest compatibility |
Abrasive sealing applications | Glass-Filled PTFE | Increased wear resistance |
Improved sealing vs standard PTFE | Modified PTFE | Reduced creep + better stability |
High wear + friction environments | Carbon-Filled PTFE | Superior wear + thermal conductivity |
High-pressure structural components | PEEK / Glass-Filled PEEK | Strength + creep resistance |
Engineering Plastics for Valves FAQ's
What plastics are commonly used for valve components?
PEEK is best for high-strength and pressure applications, while PTFE and PFA are ideal for chemical resistance, and specialized PTFE compounds like carbon-filled and glass-filled PTFE improve wear performance in demanding environments.
What is the difference between PTFE, modified PTFE, glass-filled PTFE, and carbon-filled PTFE?
Virgin PTFE provides the lowest friction and best chemical resistance, while modified PTFE improves creep resistance and sealing reliability. Glass-filled PTFE increases wear resistance and stiffness, and carbon-filled PTFE offers superior wear performance and heat dissipation for dynamic applications.
When should carbon-filled PTFE be used?
Carbon-filled PTFE is best for high-friction, high-speed, or dynamic sealing applications, where improved wear resistance and thermal conductivity are required.
When should glass-filled PTFE be used?
Glass-filled PTFE is used in applications requiring increased stiffness and resistance to wear, especially in abrasive or mechanically demanding environments.
Is PEEK better than PTFE for valve components?
PEEK is stronger and better for load-bearing applications, while PTFE and its filled variants are better suited for sealing, friction reduction, and chemical resistance.
What materials are best for wear-resistant valve components?
Glass-filled PEEK and carbon-filled PTFE provide the highest wear resistance, especially in dynamic or high-load applications.
What material performs best in cryogenic valve systems?
PCTFE is the best material for cryogenic applications due to its dimensional stability and near-zero moisture absorption.
What materials are best for tight tolerance plastic machining?
PEEK, PCTFE, and Acetal (Delrin) provide excellent machinability and dimensional stability for tight tolerances down to ±0.001”.
When should Acetal or Nylon be used instead?
Acetal and Nylon are ideal for cost-sensitive applications where extreme temperature, chemical resistance, or performance is not required, while still providing solid mechanical properties and machinability.
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