Professional Introduction to PEEK Tube (Polyetheretherketone Tube)

PEEK tubes are engineering plastic tubes made from the high-performance thermoplastic material polyetheretherketone (PEEK). Renowned for their exceptional overall properties, they serve as an ideal replacement for metal tubing. This specialty engineering plastic tube maintains excellent mechanical strength and dimensional stability, with a continuous service temperature of up to 260°C and the ability to withstand short-term exposure to 300°C.

In terms of mechanical properties, PEEK tubes achieve a tensile strength of 90-100 MPa and a flexural modulus of 3.6-4.0 GPa, maintaining good creep resistance even in high-temperature environments. Their chemical stability is particularly outstanding, as they can withstand corrosion from most strong acids, strong bases, and organic solvents, offering significant advantages in the chemical industry.

Based on the type of reinforcement, PEEK tubes are mainly categorized into three types: Standard, Glass Fiber Reinforced, and Carbon Fiber Reinforced. Standard PEEK tubes are suitable for general industrial applications. Adding 30% glass fiber increases the flexural modulus to 8.0-9.5 GPa. Carbon fiber reinforced types further elevate the tensile strength to 170-200 MPa, making them especially suitable for high-pressure environments.

Regarding application fields, PEEK tubes are widely used in corrosive fluid transfer systems within chemical processing equipment, where they can completely replace traditional stainless steel piping. In the semiconductor industry, their ultra-pure grade is used for high-purity chemical delivery systems. The medical field utilizes their biocompatibility to manufacture various surgical catheters and implantable device components. In aerospace, they are primarily applied in fuel and hydraulic systems, effectively reducing equipment weight.

Processing PEEK tubes requires specialized techniques, with thermoforming temperatures needing to be controlled between 360-400°C. For thin-walled tubes used in precision medical devices, laser welding processes can be employed, while thick-walled tubes for industrial use are better suited for machining. During installation, it is particularly important to allow for a 0.1% thermal expansion margin to accommodate dimensional changes caused by temperature variations.

Currently, leading brands in the market include international names such as Victrex (UK) and Solvay (Belgium), as well as domestic leaders like Kingfa Science & Technology. Domestic PEEK tubes offer price advantages of up to 40% and shorter lead times while achieving performance close to that of imported products.

With advancements in material technology, PEEK tubes are continually expanding into new application fields. Their high-temperature and corrosion-resistant properties are fully leveraged in emerging industries like semiconductor manufacturing and new energy batteries. In the future, as costs decrease further, PEEK tubes are expected to replace traditional metal piping in even more sectors.

Material Characteristics

PEEK (Polyetheretherketone) tubes are engineering plastic tubes made from high-performance thermoplastic polymer, possessing the following core characteristics:

1. High-Temperature Resistance

   • Continuous Service Temperature: Up to 260°C (short-term up to 300°C)

   • Glass Transition Temperature (Tg): 143°C

   • Melting Point (Tm): 343°C

2. Mechanical Properties

   • Tensile Strength: 90-100 MPa

   • Flexural Modulus: 3.6-4.0 GPa

   • Creep Resistance: Maintains dimensional stability under high temperature and pressure.

3. Chemical Resistance

   • Resistant to strong acids (except concentrated sulfuric acid), strong bases, and organic solvents.

   • Hydrolysis resistant (stable performance in steam environments).

4. Other Characteristics

   • Flame Retardancy: UL94 V-0 rating (at 1.5mm thickness)

   • Biocompatibility: Complies with ISO 10993 medical-grade standards.

Product Types & Specifications

Type	Characteristics	Typical Specification Range
Standard Tube	Unreinforced, general purpose	OD: 1-200mm, Wall Thickness: 0.5-20mm
Glass Fiber Reinforced Tube	Contains 30% Glass Fiber, increased rigidity	OD: 2-150mm, Wall Thickness: 1-15mm
Carbon Fiber Reinforced Tube	Contains 30% Carbon Fiber, excellent wear resistance	OD: 5-100mm, Wall Thickness: 2-10mm
Medical Grade Tube	Ultra-pure material, non-leachable	OD: 0.5-50mm, Wall Thickness: 0.2-5mm

Processing & Joining Techniques

Process	Parameter Requirements	Applicable Tube Types
Thermoforming	Heating temperature: 360-400°C	Standard tubes with wall thickness <10mm
Machining	Turning feed: 0.1-0.3 mm/rev	Reinforced thick-walled tubes
Welding	Laser welding (wavelength 808nm)	Medical grade thin-walled tubes
Bonding	Epoxy resin / PEEK-specific adhesives	Non-pressure bearing connections

Basic Performance Parameter Table

Performance Indicator	Standard PEEK Tube	30% Glass Fiber Reinforced	30% Carbon Fiber Reinforced	Test Standard
Density (g/cm³)	1.30 - 1.32	1.45 - 1.50	1.40 - 1.43	ISO 1183
Tensile Strength (MPa)	90 - 100	140 - 160	170 - 200	ISO 527
Flexural Modulus (GPa)	3.6 - 4.0	8.0 - 9.5	12 - 15	ISO 178
Heat Deflection Temp. (°C @1.82 MPa)	152	315	320	ISO 75
Burst Pressure (MPa, Ø10mm x 1mm)	25	45	55	ISO 1167
Surface Resistivity (Ω)	>10¹⁵	10⁴ - 10⁶	10² - 10⁴	IEC 60093

Chemical Resistance Performance Table

Chemical Medium	Concentration	Resistance (23°C)	Maximum Service Temperature
Hydrochloric Acid	37%	Excellent	60°C
Sulfuric Acid	50%	Good	40°C
Sodium Hydroxide	40%	Excellent	80°C
Acetone	100%	Excellent	50°C
Diesel Fuel	-	Excellent	120°C