Our technical section is written by several different people. Proper tooling and support remains important and particular attention should be given to adequately supporting the work. PEEK is a colorless organic thermoplastic material in the PAEK family, which consists of other plastic materials like PEK, PEEKK, PEKK, and PEKEKK. Working temperature from -40C to +250C (short periods +310C) Properties of PEEK can be improved by adding additives as carbon, glass etc. PEEK can withstand a continuous working temperature of 250C and has an excellent long-term chemical resistance. The entire stock can deflect under the pressure of cutting. PEEK has a unique combination of thermal, mechanical and chemical resistance properties. Controlling Deflection – Plastics inherently vary in their stiffness (modulus) and are more elastic at higher temperatures. This can frequently be managed by using lubricants and changing tooling or speed.Ĥ. When the pressure is removed, the stock will recover and fall out of tolerance. Softening of the stock can allow it to deflect at the surface under the pressure of the cutting tool.

Loss of Tolerance – If the overall temperature of the stock changes during or after machining, expansion or contraction can cause the part to fall out of tolerance. Temperatures at the surface can rinse unexpectedly high.ģ. PEEK has a high tensile strength which can be greatly improved when reinforced with carbon fibres, reaching a value of 29,000 psi (200 MPa). Most of the heat generated by machining will stay at the surface. PEEK’s chemical name is Poly (oxy-1, 4-phenyleneoxy-1, 4-phenylenecarbonyl-1, 4-phenylene). Melting or Scorching– The thermal conductivity of plastics is low relative to metals. Limiting Heat Build-up – The softening or melting temperatures of engineering plastics are roughly 1/10th those of metals.Ģ.

Material peek