Chloe Zhang
PEEK (polyetheretherketone) is a popular thermoplastic polymer used in a wide range of applications, from aerospace and automotive to medical and electronics. With its high performance and versatility, PEEK is an ideal choice for demanding applications. While it is known for its exceptional chemical resistance, mechanical strength, and stability, the question arises: does PEEK plastic have a shelf life? The answer is complex and depends on various factors, including storage conditions and the specific grade of PEEK.
| Characteristics | Values |
|---|---|
| Shelf life | No scientific basis for thermoplastics to have a shelf life. However, it will become less pliable and harder over time. |
| Stability | Stability can be stated in years, not months. |
| Storage conditions | Low temperature and humidity prolong the integrity of the material. |
| Exposure | Exposure to ultraviolet light, ozone, nitrogen and sulfur oxides reduces shelf life. |
| Temperature | PEEK maintains its stiffness at elevated temperatures, in continuous use up to 338°F (170°C). |
| Radiation | PEEK has the highest level of radiation resistance among thermoplastics. |
| Mechanical strength | PEEK has excellent mechanical strength and dimensional stability. |
| Chemical resistance | PEEK has outstanding resistance to harsh chemicals. |
| Thermal conductivity | PEEK has low thermal conductivity. |
| Bending | PEEK is resistant to bending. |
| Solvents | PEEK is resistant to a wide range of solvents. |
| Water | PEEK is water-resistant. |
| Steam | PEEK is steam-resistant. |
| Seawater | PEEK is seawater-resistant. |
| Electrical insulation | PEEK is electrically insulating. |
| Thermal insulation | PEEK is thermally insulating. |
| Machining | PEEK is readily machinable. |
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What You'll Learn
PEEK plastic's resistance to degradation
PEEK (polyetheretherketone) is a high-performance engineering plastic with excellent resistance to degradation. It is a stiff, high-temperature material with exceptional chemical resistance, mechanical strength, and dimensional stability. PEEK plastic can maintain its stiffness at elevated temperatures and is suitable for continuous use at temperatures up to 338°F (170°C). It even has a proven track record in challenging environments, such as aerospace, oil and gas, food and beverage processing, and semiconductors.
One of PEEK's standout features is its resilience in high-temperature scenarios. For instance, Ketron 1000, a standard unfilled grade of PEEK, has a maximum allowable service temperature of 250°C or 320°F, making it suitable for high-temperature applications. PEEK tubing can also safely withstand exposure to 20-30% nitric acid for system passivation purposes without degrading, something that is detrimental to many other common plastics such as PVC.
PEEK also demonstrates impressive low-temperature performance, distinguishing itself from many other materials. Its glass transition temperature is around 143°C (289°F), and it melts around 343°C (662°F). Some grades of PEEK even have a useful operating temperature of up to 250°C (482°F). This resistance to thermal degradation, as well as its resistance to attack by both organic and aqueous environments, makes PEEK an ideal choice for applications requiring superior thermal properties.
In terms of chemical compatibility, PEEK outperforms common plastics like PVC and polyethylene. It shows no degradation when exposed to various concentrations of acetic acid, lactic acid, oxalic acid, and even phosphoric acid. Even in the presence of oleic acid, which can soften or degrade PVC and polyethylene, PEEK remains unaffected. Additionally, PEEK is resistant to steam, water, and seawater.
While PEEK offers excellent resistance to a wide range of chemicals, it does have some limitations. For example, it is incompatible with sulfuric acid (concentrations >10%), methylene chloride, DMSO, and THF. It is also important to note that temperature significantly affects PEEK's chemical compatibility and durability. While PEEK is highly resistant to thermal degradation, it will become more brittle when exposed to elevated temperatures over long periods.
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The stability of thermoplastics
PEEK (polyetheretherketone) is a popular thermoplastic polymer used in a variety of industries, including aerospace, automotive, medical, and electronics. It offers excellent thermal, chemical, and mechanical stability, making it suitable for demanding applications. While PEEK itself does not have a specified shelf life, the stability of thermoplastics as a broader category is influenced by various factors.
Thermoplastics, including PEEK, can be characterized by thermal analysis techniques such as DSC, TGA, TMA, and DMA. These methods are advantageous because they can measure the properties of thermoplastics as a function of temperature or time over a wide temperature range. The stability of thermoplastics is typically discussed in years rather than months, but this can vary depending on the specific material and its storage conditions.
Storage conditions play a critical role in determining the shelf life of thermoplastics. Factors such as temperature, humidity, exposure to elements like ultraviolet light, ozone, and nitrogen and sulfur oxides can impact the stability and performance of the material over time. For example, materials stored at lower temperatures and humidity levels tend to maintain their integrity and processability for longer periods. Additionally, the presence of original and uncompromised packaging can also influence the shelf life.
The composition of the material is another factor that affects the stability of thermoplastics. For instance, thermosetting materials, which include rigid and elastomeric types, have a time-sensitive nature due to the presence of compounds that are not completely formed polymers. The catalyst within these compounds can react prematurely or volatilize, impacting the stability and performance of the material over time.
Furthermore, the processing conditions used to mould thermoplastics can influence their crystallinity and mechanical properties. PEEK, in particular, exhibits a glass transition temperature of around 143°C and melts at approximately 343°C. Some grades of PEEK can operate at temperatures up to 250°C, showcasing their thermal stability. However, PEEK is susceptible to degradation by specific compounds, such as halogens, strong acids, and some halogenated compounds or aliphatic hydrocarbons at elevated temperatures.
Overall, the stability of thermoplastics, including PEEK, is influenced by a combination of factors, including the material's composition, storage conditions, and processing techniques. While PEEK does not have a specified shelf life, its stability is well-regarded within the thermoplastics family, making it a versatile and widely used polymer in various industries.
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PEEK's performance in challenging environments
PEEK (polyetheretherketone) is a high-performance engineering plastic with excellent mechanical and chemical resistance properties that are retained at high temperatures. It is used in a wide variety of challenging industrial applications that require parts that can withstand high temperatures, high pressure, high impact, corrosion, friction, and wear.
One of the few plastics compatible with ultra-high vacuum applications, PEEK is suitable for the aerospace, automotive, and chemical industries. PEEK is used in medical implants, for example, in neurosurgical applications to create a partial replacement skull. It is also used in spinal fusion devices and reinforcing rods. PEEK seals and manifolds are commonly used in fluid applications.
PEEK is also used in oil and gas applications, where its chemical resistance, durability, and self-lubricating properties supply a thermoplastic parts solution for parts such as spools, sealing applications, nozzles, gaskets, and torque loadings.
In the food and beverage processing and pharmaceutical industries, PEEK is used for its ability to withstand steam, water, and seawater. PEEK is FDA compliant and can be detected by metal and X-ray.
PEEK's strength, impact resistance, and other outstanding physical properties make it an excellent choice to replace metal parts in challenging environments. Its high price, due to its complex production process, restricts its use to demanding applications.
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PEEK's suitability for medical applications
PEEK (polyether-ether-ketone) is a high-performance thermoplastic with a range of properties that make it suitable for medical applications. PEEK is used in millions of medical devices, both implantable and non-implantable, and its usage in the medical industry has grown tremendously over the past fifteen years.
One of the critical qualities of PEEK is its stiffness, which can be customised to approximate the stiffness of human bone. This makes PEEK an excellent choice for spinal applications, as well as arthroplasty and arthroscopy, including knee and shoulder arthroscopy, and knee and hip arthroplasty. PEEK is also used in hip cups, knotless suture anchors in shoulder arthroscopy, and tibial screw anchors and sheaths.
PEEK's excellent fatigue/wear properties, high strength-to-weight ratio, and biocompatibility make it a good choice for medical applications. It is also suitable for sterilisation using harsh processes such as autoclaving. PEEK seals and bearings are used in critical medical applications such as dialysis equipment, blood pumps, infusion pumps, reusable medical instruments, tissue-cutting tools, and medical device fixtures.
PEEK is also radiolucent, which makes it suitable for use in X-rays and other diagnostic imaging. Its low rate of moisture absorption, high thermal resistance, and wide range of chemical compatibility are other advantages of PEEK.
PEEK is available in a variety of grades, including unfilled PEEK, which is well suited for components that require inertness and ductility. Other grades include 30% Glass-Fiber Reinforced PEEK, which increases stiffness and improves electrical and thermal insulation, and 30% Carbon-Fiber Reinforced PEEK, which offers the highest strength and stiffness, outstanding wear resistance, and improved load-carrying capabilities.
Overall, PEEK's unique combination of properties, including its hardness, resilience, and load-bearing capabilities, make it a versatile and valuable material for medical applications.
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The influence of storage conditions
PEEK (polyetheretherketone) is a high-performance engineering plastic with excellent mechanical strength and dimensional stability. It is known for its exceptional chemical resistance and ability to maintain stiffness at high temperatures. While PEEK has a long lifetime and is suitable for harsh environments, storage conditions can impact its shelf life and performance over time.
The stability of PEEK plastic is typically measured in years rather than months. However, proper storage conditions are critical to maintaining its integrity and processability. Lower temperatures and humidity levels during storage can extend the shelf life of PEEK plastic. Refrigerated storage can help achieve this, as demonstrated by facilities storing raw materials.
Exposure to ultraviolet light, ozone, and nitrogen and sulfur oxides produced by combustion can shorten the shelf life of PEEK plastic and potentially alter its colour. Therefore, storing PEEK plastic in its original packaging, ensuring the packaging remains intact, and protecting it from the aforementioned elements can help prolong its shelf life.
Additionally, PEEK plastic becomes more brittle when exposed to elevated temperatures over prolonged periods. For example, when subjected to 200 degrees Celsius for 10,000 hours in laboratory conditions, PEEK loses more than 50% of its ductility. At even higher temperatures, degradation occurs more rapidly. Thus, maintaining stable temperatures within the recommended range is crucial for preserving the performance of PEEK plastic over its shelf life.
In summary, while PEEK plastic has a long lifetime and exceptional stability, adhering to the recommended storage conditions is essential to preserving its integrity and performance characteristics over time. Proper storage can ensure that PEEK plastic retains its desirable mechanical strength, dimensional stability, and chemical resistance throughout its shelf life.
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Frequently asked questions
PEEK plastic is highly resistant to thermal degradation and can be used at temperatures of 260°C for 5000 hours without losing its strength. It also has a long lifetime in harsh environments. However, like all polymer materials, PEEK will become more brittle when exposed to elevated temperatures over long periods of time. Therefore, while PEEK plastic does not have a specified shelf life, its properties may change over time depending on storage conditions.
PEEK, or polyetheretherketone, is a high-performance engineering plastic with outstanding resistance to harsh chemicals, excellent mechanical strength, and dimensional stability. It is one of the most popular thermoplastics on the market and is used in a wide variety of applications, including aerospace, automotive, medical, marine, and electronics.
PEEK plastic has excellent mechanical and chemical resistance properties that are retained at high temperatures. It is also resistant to radiation, steam, water, seawater, bending, and compressive stress. PEEK is biocompatible and can be used in medical implants, making it a versatile choice for various industries.
One of the main disadvantages of PEEK plastic is its high price, due to its complex production process. PEEK is also attacked by halogens, strong acids, and some halogenated compounds and aliphatic hydrocarbons at high temperatures. Additionally, PEEK is soluble in concentrated sulfuric acid at room temperature, although this process can be very slow.
The processing conditions used to mould PEEK can influence its crystallinity and mechanical properties. PEEK's high molecular weight and melt stability enable it to be extruded into large cross-sections. Recent advances in processing have also allowed for shape-memory behaviour in PEEK.
