Polyether ether ketone (PEEK) is a high-performance engineering plastic that has many exceptional properties, making it suitable for use in a wide range of applications. A common variation is PEEK GF30, which is unfilled PEEK that has been reinforced with 30% glass fibres. This reinforcement gives PEEK GF30 improved strength and stiffness compared to unfilled PEEK.

PEEK GF30 is a semi-crystalline polymer, which means that it has both crystalline and amorphous regions in its structure. The crystalline regions of PEEK GF30 give it excellent mechanical properties, such as high tensile strength, flexural strength, and modulus of elasticity. The amorphous regions enable high levels of toughness and impact resistance. 

The addition of glass fibres further enhances PEEK GF30’s mechanical properties, making a highly suitable material for use in applications where unfilled PEEK doesn’t meet the high strength and stiffness required.