What Is PEEK Material?

Polyetheretherketone, or PEEK, is a semi-crystalline high-performance engineering thermoplastic material with outstanding resistance to severe chemicals and a wide range of other desirable qualities.

Since PEEK was first made available to the public in the 1980s, there has been no turning back. PEEK is one of the most durable and widely used thermoplastic materials because of its remarkable mechanical qualities, resistance to wear and fatigue, and high temperature up to 260°C.

It’s one of the easiest materials to work with across the board, but its strength and durability make it particularly useful in oil and gas, aerospace, automotive, electrical, biomedical, and semi-conductor applications.

Injection moulding, extrusion moulding, compression moulding, and so on can all be used to shape polyetheretherketone, among other things. 

PEEK has excellent creep resistance because of its properties.

• Combine its tensile and flexural strengths, and you get a material with excellent mechanical qualities that can endure stress for a long time without breaking.
• The tensile strength of PEEK remains excellent up to 299 ℃. To get the best possible outcomes while still maintaining the polymer’s characteristics, carbon fibre reinforcement is recommended. The tensile strength can be easily increased to between 25000 and 30000 psi.
•  The polymer’s insulating characteristics hold up throughout a wide range of temperatures and conditions.
•  The polymer’s crystalline structure allows for very high resistance, excellent fatigue performance, and a wide range of liquid resistance.
• A better heat conductor, the polymer’s spiral structure aids in reinforcing glass or carbon reinforcement.
• It has a low flammability rating of V0 (1.45 mm) and a low toxicity index (LOI) of 35%, making it safe for both manufacturers and the environment. When burned, it produces fewer harmful byproducts like smoke and fumes than most common thermoplastics.

The Many Advantages of PEEK

• Because of its high rigidity, hardness, and exceptional fatigue resistance, PEEK has a strength that is on par with that of alloys.
• Its low coefficients of friction and abrasion make it ideal for demanding applications, and its outstanding sliding qualities make it particularly so.
• Earthen materials are resistant to corrosion and chemicals.
• With a thickness of only 1.45mm, PEEK does not require any flame retardants while having some of the finest flame resistance qualities of any thermoplastic.
• The ease of production with these wires and magnet wires, as well as PEEK’s resistance to peeling, makes it useful in demanding environments.

PEEK’s Drawbacks

As we’ve established, however, PEEK isn’t as flawless as it seems. Despite its many benefits and uses, it does have a few drawbacks that should be mentioned.

• Some people shouldn’t undergo processing at excessively high temperatures.
• Low resistance to UV light is one of its main flaws.
• Due to its exceptional mechanical qualities, this polymer comes at a high price and can be used in cutting-edge technologies. PEEK may potentially be a hindrance when it comes to producing basic parts.

How can one go about making PEEK?

PEEK’s primary component is bisphenolate salts. PEEK is created by a step-growth polymerization with the dialkylation method.

Polymerization, in which monomers combine to form a polymer, is the first step in the production of polyetheretherketone (PEEK). The two monomers used in PEEK production are bisphenol-A and 4,4′-difluorobenzophenone. These monomers are combined in a reactor vessel with a solvent and a catalyst.

The polymerization reaction begins when the mixture is heated to about 300 ℃ and continues until the appropriate molecular weight is reached.

The excellent thermal transitions and mechanical qualities can be attributed directly to the rigid aromatic polymer backbone. As a result, the polymer can be employed in environments where temperatures reach 240℃.

Polyetheretherketone (PEEK) is widely used in a variety of industries. 

PEEK The aerospace, automotive, medicinal, electrical, and other sectors make extensive use of plastic, one of the most widely used thermoplastic materials. Bearings, insulation cables, safety gears, pumps, parts of heavy machines, valves, compressors, semiconductors, and so on can all benefit from its strength and energy in production.

Aerospace 

In the aerospace industry, PEEK-produced products and components are gradually replacing those made of aluminium and other metals. Tolerances are generally acceptable, and many parts may be produced more cheaply, in the aircraft industry.

Polyetheretherketone’s excellent temperature resistance means that complex engine parts, such as those requiring heavy lubrication and inter-biological processes, can be manufactured.

The polymer has the potential to drastically cut down on indoor smoke and gas emissions. The ability to resist fire will also play a crucial part in keeping people safe.

PEEK is great for the outside since it resists water damage. Even here, the ability to resist wear and tear will prove useful in protecting the exterior of the plane over time.

Safety, comfort, and mobility are at the heart of healthcare products. Polyetheretherketone is used in the production of low-priced, durable, chemical- and heat-resistant materials. Dental tools, guards, endoscopes, thermometers, and dialyzers are just a few of the many uses for this material.

• PEEK dental syringes are only one example of how the material has been used to replace heavier and more expensive materials like aluminium and metal.
• PEEK is also used in the production of sterile containers, artificial limbs, teeth, and load-bearing implants.
• PEEK is a great choice for medical applications because of its durability and resistance to chemicals, steam, water, and other common solvents found in hospitals and clinics.

Electronics

The electronic industry is already heavily reliant on PEEK material. Mobile phones, cables, setup boxes, refrigerators, air conditioners, washing machines, computers, laptops, and electronic wearables are all examples of common household electronics. All of these items, or at least some of the components that go into making them, are made using PEEK.

• It can be put to use in the production of items subject to varying degrees of heat, sound, and pressure.
• The exceptional mechanical qualities of silicon wafers will greatly improve workers’ security and convenience.
• PEEK also finds widespread use in the FMCG, hospitality, chemical, packaging, transportation, and logistics industries, among others.

PEEK Material Processing 

Injection moulding, extrusion, and compression moulding are all viable options for working with PEEK plastic; nevertheless, the moulding method has a significant impact on the material’s mechanical properties.

It should be dried for at least three hours at 150 ℃ before being processed. Defects in the mould will be avoided if you do this.

Molding via Injection 

• For optimal crystallization and no warping, a mould temperature of 60–190°C is recommended.
• After crystallization, adjustments can be made at 200 ℃, but only if the next component calls for extremely precise dimensions.
• To ensure near-perfect manufacturing quality, injection moulding should only be used to produce very small components with strict dimensional tolerances.
• Injection pressures between 70 and 140 Mpa are recommended.
• Unfilled moulds are recommended to shrink 1.2-2.4%, whereas filled moulds should shrink 0.11-2%.

Extrusion 

• For optimal crystallization and functionality, the cooling temperature is critical.
• For amorphous materials, the ideal temperature for sheet extrusion when cooling cylinders is 50 ℃.
• The ideal temperature for a cooling cylinder used for crystalline and opaque materials is 170 ℃.

PEEK: The Material of the Future 

The global Polyetheretherketone market was worth $684.8 million in 2018, per a study by Grand View Research. And projected to expand by 7.2% year between 2019 and 2026. The COVID-19 pandemic will undoubtedly have far-reaching effects.

A rise in demand for lightweight, fuel-efficient, and less-polluting cars is behind the recent push in the medical business (a result of the pandemic) and the industry’s spectacular expansion.

Growth will be spurred by demand from major markets in North America, Europe, and Asia-Pacific. Increased manufacturing spending and FDI have made Asia-Pacific the fastest-growing market for plastic processing overall, let alone Polyetheretherketone.