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Mechanical properties of PEEK

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Mechanical properties of PEEK

Mechanical properties of PEEK

I. High strength


  1. Tensile strength:
    • The tensile strength of PEEK is relatively high, generally between 90 and 100 MPa. This means that when subjected to tensile force, it can withstand a large stress without breaking.

    • For example, in some applications that require high tensile force, such as high-performance ropes and conveyor belts, PEEK materials can provide reliable strength guarantees.

  2. Flexural strength:
    • The flexural strength of PEEK is also excellent, usually around 140-160 MPa. This enables it to maintain good rigidity and stability when subjected to bending loads.

    • For instance, in the fields of mechanical structural parts and automotive parts, the high flexural strength of PEEK materials can ensure that parts are not easily deformed under complex stress conditions.


II. High hardness


  1. Rockwell hardness:
    • The Rockwell hardness of PEEK is generally between M90-95, with a relatively high hardness value. This gives it good wear resistance and scratch resistance.

    • In some occasions where high surface hardness is required, such as gears and bearings, PEEK materials can effectively reduce wear and damage.

  2. Brinell hardness:
    • The Brinell hardness of PEEK is also considerable, usually between 20 and 30 HBW. This further proves its high hardness and can withstand a certain pressure without significant deformation.


III. Good toughness


  1. Impact strength:
    • PEEK has a relatively high impact strength. In the unnotched state, it can reach 80-100 kJ/m², and in the notched state, it can still maintain around 10-15 kJ/m².

    • This means that when subjected to impact loads, it can absorb a large amount of energy without brittle fracture. For example, in some applications that need to withstand impacts, such as protective equipment and sports equipment, PEEK materials can provide good protection performance.

  2. Elongation at break:
    • The elongation at break of PEEK is generally between 15 and 30%, indicating that it has a certain degree of ductility. This enables it to deform to a certain extent without breaking immediately when subjected to external forces, thereby improving the reliability and service life of the material.


IV. Good dimensional stability


  1. Low coefficient of thermal expansion:
    • The coefficient of thermal expansion of PEEK is very low, generally between 20 and 40×10⁻⁶/K. This means that when the temperature changes, the dimensional change is very small.

    • For example, in high-precision mechanical parts and electronic components, the low coefficient of thermal expansion of PEEK materials can ensure the dimensional accuracy and stability of parts.

  2. Low water absorption:
    • The water absorption rate of PEEK is very low, usually less than 0.2%. This makes its dimensional change also very small in a humid environment.

    • In some applications that require high dimensional stability, such as medical devices and aerospace components, PEEK materials can provide reliable performance guarantees.


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