The cost of PEEK is a result of its complex chemical synthesis and the specialised, high-temperature equipment required to produce it. Also, because it is a high-performance polymer, it is produced in much smaller volumes than commodity plastics like polyethylene.
However, the cost of PEEK is often offset by its ability to replace expensive metal alloys and its significantly longer service life in harsh environments.

Yes, PEEK is one of the most popular high-performance materials for 3D printing, specifically via FDM (Fused Deposition Modelling) and SLS (Selective Laser Sintering).
PEEK can be challenging to print; it requires an industrial-grade printer with a nozzle capable of reaching 400°C and a high-temperature heated chamber to prevent warping and ensure proper interlayer bonding. You can find our PEEK 3D Printing Filament here.

Absolutely. PEEK is chemically inert and has been used in medical implants since the 1990s. Many grades meet ISO 10993 requirements for long-term implantation.
It is often preferred over titanium because its "stiffness" (modulus) is closer to that of human bone which helps prevent bone resorption around the implant.

PEEK is approximately 70% lighter than steel and 40% lighter than aluminium, so while metals have higher absolute strength, PEEK’s strength-to-weight ratio is exceptional.
Also, PEEK does not corrode, is an excellent electrical insulator, and provides better vibration damping (noise reduction) than most metals.

PEEK machines very well and is often compared to machining a hard brass or a reinforced plastic. It is dimensionally stable, allowing for very tight tolerances.
However, because it is a thermoplastic, heat management is vital. High-speed steel or carbide tools should be kept sharp, and coolants are recommended to prevent the material from softening or "gumming" during the cut.

Hardly at all. PEEK has an incredibly low moisture absorption rate (roughly 0.05% by weight over 24 hours). This means that, unlike nylon (which swells and weakens when wet), PEEK components maintain their size and mechanical strength even when submerged in boiling water or high-pressure steam.

PEEK has naturally good resistance to UV radiation, making it suitable for many outdoor applications.
However, if exposed to intense, direct sunlight for many years, the surface may undergo slight "chalking" or discolouration. For extreme long-term outdoor use, black pigmented or UV-stabilised grades are recommended.

Yes, PEEK is inherently flame retardant without the need for chemical additives. It typically achieves a UL 94 V-0 rating, meaning it self-extinguishes.
Crucially, when PEEK does burn, it emits very low levels of smoke and virtually no toxic gases, which is why it is so highly favoured in aircraft cabin interiors.

While PEEK is famous for its "universal" resistance, it is not invincible. It can be severely attacked by concentrated sulphuric acid (which dissolves it), concentrated nitric acid, and certain halogens or strong oxidising agents like bromine or fluorine gas.
Always check a chemical compatibility chart if using PEEK with strong mineral acids.