PEEK Bellow

PEEK bellows are meticulously crafted from polyetheretherketone material, featuring a corrugated outer wall structure. They enable substantial expansion and contraction within confined spaces while exhibiting exceptional flexibility and resistance to kinking. These properties render them widely applicable in scenarios requiring bending and movement.

Standards for PEEK Bellow

Excellent resistance to mechanical and chemical stress
High thermal degradation resistance
Superior strength, rigidity and dimensional stability
Low coefficient of friction
High wear resistance, eliminating lubrication requirements
Lighter weight compared to steel, aluminium and titanium
Customizable geometry: bellows height, wall thickness, pitch, material grade, end-connections

Why choose PEEK Bellows?

Possesses outstanding high-temperature resistance, chemical resistance, corrosion resistance, sliding properties, flame retardancy, non-stick characteristics, electrical insulation, weather resistance, peel resistance, stability, and the best fatigue resistance among all resins.

Particularly suitable for steam conveyance or applications demanding high negative pressure. This tubing exhibits exceptional mechanical strength, resistance to kinking, and outstanding high-pressure and vacuum tolerance even at elevated temperatures.

Applications and Uses of PEEK Bellows

Chemical Processing

PEEK bellows are superior to be used in designs that require high temperatures of strong alkalis or organic solvents like in diaphragm pumps or metering lines in a chemical plant. Their corrosion resistance and strength against fatigue make them an alternative of choice in case PTFE or the metal substitutes are not sufficient.

Semiconductor / Wet Process

PEEK bellows would be a good solution in semiconductor wet-bench systems where chemical purity and particle generation are paramount concerns. Their outgassing is low and the modulus is high and is used to maintain system integrity in repetitive motion.

Vacuum Equipment & Analytical Equipment.

Mass spectrometers or other analytical instruments In the case of vacuum chambers, PEEK bellows can be used as a flexible protective element, although the designers need to verify that it can be used in a vacuum, and outgassing limits and the necessity of bake-out must be taken into account.

Pharmaceutical / Medical Systems.

PEEK bellows with the right combination of grades and processing can be utilised in a medical fluidics, sterilizable equipment and other controlled conditions, particularly when metal parts are inappropriate or too heavy, and PTFE is not strong enough.

Other applications

Additionally, it may be employed as cable protection conduits in corrosive environments, vacuum and pressure piping within high-temperature systems, pharmaceutical and food processing equipment requiring cleanliness and durability, fluid management systems in the automotive and aerospace industries, and as feed and discharge pipes for tankers, storage tanks, vessels, and reactors. It may serve as a replacement for piping materials such as graphite, ceramics, and glass, which possess lower mechanical strength.

Key Properties of PEEK Bellows

Engineering thermoplastic PEPEK: It is a high temperature-resistant thermoplastic that has excellent chemical resistance, fatigue resistance, and thermal stability. It has better mechanical and electrical characteristics and is still able to achieve good mechanical performance up to continuous operating temperatures up to 480 ° F in steam or high-pressure water conditions and 570 °F. The excellent resistance to chemicals contributes to the fact that PEEK can be used as a viable alternative to metals/stainless steel in severe conditions and has proved a worthy alternative to other materials.

Temperature

Chemical

Safety

Define the application: Determine operating medium (fluid/gas), chemistry, temperature, pressure, and motion (stroke, cycles).
Match material grade: Choose a PEEK grade based on temperature, chemical environment and regulatory needs (e.g., USP Class VI, ISO 10993).
Select geometry: Based on required stroke, spring rate/response and fatigue life.
Check tolerance & purity: For high-clean or vacuum systems, ensure low particulate and low outgassing.
Compare alternatives: If acid concentration is very high (e.g., >10 % sulfuric acid) or vacuum levels extreme, assess PTFE/PFA or metal bellows instead.

PEEK has greater mechanical strength and rigidity (which is advantageous in dynamic motion and fatigue resistance). PTFE is the best in terms of chemical inertness (most particularly strong acids). When chemical environment is very aggressive, then PTFE can be used, when motion, strength and durability is of concern then PEEK can be a better choice.

In most datasheets, PEEK is resistant to sodium hydroxide (e.g., 10-50% NaOH at 100 of lower) at 100°C of less. But above 10% concentrated sulfuric acid, its performance is not so much reliable and special testing or other material might be required.

PEEK may be used in vacuum systems, but polymers generally have higher outgassing and permeation than metals. For UHV applications, you should verify bake-out capability, outgassing rates and whether a metal bellows is required.

Typical options include machining (flexible for custom), injection/compression molding (suitable for volume production) and dip-molding (good for thin-walled or complex geometry components).

PEEK Bellows size chart

OD(INCH)	OD(MM)	ID +/- INCH	OD +/- MM	wall-T(INCH)	wall-T(MM)
3 /16	4.76	0.182-0.192	4.62-4.88	0.005	0.127
1 /4	6.35	0.245-0.255	6.22-6.48	0.007	0.178
3 /8	9.53	0.370-0.380	9.40-9.65	0.01	0.254
1 /2	12.7	0.493-0.507	12.5-12.9	0.012	0.305
5 /8	15.9	0.618-0.632	15.9-16.1	0.012	0.305
3 /4	19.1	0.740-0.760	18.8-19.3	0.015	0.381
7 /8	22.2	0.860-0.890	21.8-22.6	0.015	0.381
1.0	25.4	0.980-1.02	24.9-25.9	0.02	0.508

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Ordering & Supply Information

Minimum Order Quantity (MOQ): (e.g., 50 pcs or negotiable depending on size/spec).
Standard lead time: Prototype samples in ~4–6 weeks, mass production typical 8–12 weeks (subject to specification and quantity).
Stocked SKUs: Some common sizes ready to ship (e.g., Ø30 mm × stroke 20 mm, wall 2 mm).
Global shipping: Ships from Taiwan, with overseas warehouses in Asia & Europe; local duty/tax handling supported.
Customization: Options for end-connections (flanges, threads), plating/cleaning, vacuum bake-out, clean-room packaging.

PEEK Bellow

Standards for PEEK Bellow