In the demanding world of industrial components, the integrity of a seal often determines the integrity of an entire system. When standard materials fail under extreme pressure, aggressive chemicals, or punishing temperatures, engineers turn to high-performance polymers. Among these, PTFE and PEEK Seals stand out as the pinnacle of reliability and advanced engineering. At Kaxite, we specialize in manufacturing seals from these exceptional materials, providing solutions where failure is not an option.
PTFE (Polytetrafluoroethylene), best known by the brand name Teflon®, and PEEK (Polyether Ether Ketone) are both high-performance thermoplastics, but they serve in complementary, often distinct, realms of application. Their unique molecular structures grant them properties far surpassing those of conventional elastomers or metals.
Combining these materials, or using them in specific, optimized forms, allows Kaxite to engineer seals for the most challenging conditions.
Our seals are not off-the-shelf commodities; they are precision-engineered components. We offer a comprehensive range of seal types, each customizable to meet exact specifications. Below are the core parameters that define our product lines.
| Material | Kaxite Grade | Key Characteristics | Typical Applications |
|---|---|---|---|
| Virgin PTFE | KX-PTFE-V | Pure, unfilled PTFE. Excellent chemical resistance, dielectric properties, and low friction. | Chemical processing, semiconductor manufacturing, food & beverage, electrical insulation. |
| KX-PTFE-G25 | 25% Glass-filled. Improved compressive strength, reduced cold flow, better wear resistance. | Heavy-duty static gaskets, valve seats, bearing pads. | |
| KX-PTFE-B | Bronze-filled. Superior thermal conductivity, high load capacity, excellent wear resistance. | Thrust washers, bushings, compressor rings. | |
| PEEK | KX-PEEK-V | Virgin PEEK. Highest purity, excellent mechanical properties and chemical resistance. | Medical implants, semiconductor, aerospace, and high-purity fluid handling. |
| KX-PEEK-CF30 | 30% Carbon Fiber-reinforced. Maximized stiffness, strength, and fatigue resistance. Very low creep. | Downhole oil & gas tools, high-load bearings, pump vanes, and seals for aggressive dynamic service. | |
| PTFE Encapsulated Elastomers | KX-ENCAP | An elastomeric O-ring (e.g., FKM, NBR) fully encapsulated in a PTFE jacket. Combines PTFE's surface properties with the elasticity of rubber. | Hydraulic & pneumatic systems in corrosive or low-friction applications, rotary shaft seals. |
| Parameter | PTFE (Virgin) | PEEK (Virgin) | Test Standard |
|---|---|---|---|
| Continuous Service Temperature | -200°C to +260°C (-328°F to +500°F) | -60°C to +250°C (-76°F to +482°F) | ASTM D794 |
| Tensile Strength | 25 - 35 MPa (3,600 - 5,000 psi) | 90 - 100 MPa (13,000 - 14,500 psi) | ASTM D638 |
| Compressive Strength | 12 MPa (1,700 psi) | 110 MPa (16,000 psi) | ASTM D695 |
| Coefficient of Friction (Dynamic) | 0.04 - 0.10 | 0.30 - 0.40 | ASTM D1894 |
| Chemical Resistance | Excellent (Inert to most chemicals) | Very Good (Resistant to organics, weak acids/bases. Attacked by conc. sulfuric acid) | ASTM D543 |
| PV Limit (for dynamic seals) | 10,000 psi-fpm (filled grades higher) | 15,000 - 50,000 psi-fpm (depending on grade) | Industry Standard |
Q: When should I choose a PTFE seal over a PEEK seal?
A: The choice hinges on the primary challenge. Choose PTFE seals when your top priorities are unmatched chemical resistance (e.g., handling strong acids like sulfuric or hydrofluoric), achieving the absolute lowest friction, or needing FDA/USP Class VI compliance for food or pharmaceutical contact. PTFE is also superior for cryogenic applications. Choose PEEK seals when you need exceptional mechanical strength, rigidity, and resistance to creep under continuous high load at elevated temperatures (e.g., in oil & gas downhole tools). PEEK also performs better in continuous hot water or steam.
Q: Can PTFE and PEEK seals be used in dynamic applications?
A: Yes, absolutely, but often in different forms. Pure, virgin PTFE has a high wear rate in dynamic use. For dynamic sealing, Kaxite uses filled PTFE compounds (glass, carbon, bronze) which dramatically improve wear resistance and reduce cold flow, making them suitable for rod seals, piston rings, and bearings. PEEK, especially carbon-fiber reinforced grades like our KX-PEEK-CF30, is inherently excellent for dynamic applications due to its high strength, low creep, and outstanding wear resistance, often replacing metal in such roles.
Q: What is "cold flow" or "creep," and how does it affect seal performance?
A: Cold flow, also called creep, is the tendency of a material to deform permanently under a sustained mechanical load (like the compression force on a gasket). Both PTFE and, to a much lesser degree, PEEK are susceptible. Under constant pressure, the seal can slowly deform, leading to a loss of sealing force and eventual leakage. Kaxite combats this by using filled PTFE compounds (fillers act as anti-extrusion agents) and by designing seals with adequate cross-sections and support rings. For critical applications, spring-energized seals are the best solution as the metal spring maintains a constant load, compensating for any material creep.
Q: Are Kaxite PTFE seals suitable for food, pharmaceutical, or ultra-pure applications?
A: Yes. Kaxite offers seals manufactured from 100% virgin, unfilled PTFE that is compliant with FDA CFR 21 and USP Class VI regulations. This material is inert, non-toxic, and will not contaminate process streams. It is the standard for seals in bio-processing, pharmaceutical manufacturing, food & beverage equipment, and semiconductor wet benches where purity is paramount.
Q: How do I handle and install PTFE and PEEK seals compared to rubber O-rings?
A> PTFE and PEEK are thermoplastics, not elastomers. They do not stretch like rubber. Therefore, installation requires more care. For O-rings, you must use proper installation tools to avoid cutting or shaving the material. For complex profiles like U-cups or V-rings, follow Kaxite's specific installation guidelines, which often include the use of conical sleeves or other fixtures to guide the seal over sharp edges or threads without damage. Never over-stretch a PTFE seal.
Q: Can you customize seals for my specific application?
A> Customization is a core strength of Kaxite. We don't just sell parts; we provide sealing solutions. Our engineering team can work with your specifications for:
Q: What industries most commonly use Kaxite PTFE and PEEK Seals?
A> Our seals are critical components across a vast range of industries:
