![]() Keep adding powder and repacking until the mold is filled with the required amount of powder. To avoid the formation of black spots during molding, the internal surfaces of the mold must be spotless.Ĭoat the molding surfaces with mold release and allow it to dry.įill the tool with powder, place the seal ring on top and apply approximately 5,000 psi (350 bar) of pressure to pack the powder. PEEK materials must be kept clean and free of cross-contamination. To prevent moisture from causing bubbles, the PEEK powder should be dried for 3 hours at 150 ☌ or overnight at 120 ☌. Using pellets would also make it more difficult to achieve equivalently high packing density, which could lead to voids in the molded part. The lack of shear forces in compression molding makes it less suited for molding pellets, which would result in grain boundaries between compressed pellets that would reduce mechanical performance similar to weld lines. Use fine powder grades to achieve the best-performing compression molded parts. PEEK / VICTREX® Compression Molding Process KetaSpire® PEEK from Solvay Specialty Polymers PEEK is often used to make medical implants. PEEK is used to produce large seal rings and other parts for the oil & gas industry. Fully recyclable, yielding environmental and regulatory benefitsĬompression-molded PEEK is used to manufacture parts that are designed to replace metal parts, improve performance and reduce overall costs for demanding oilfield, electronics, transportation and medical applications.Electrical properties are maintained over a wide frequency and temperature range.Chemical and water resistance similar to that of PPS but at higher continuous operating temperatures, up to 250 ☌ (482 ☏).Low moisture absorption plus resistance to steam, water and brine with low permeability means good hydrolysis resistance. ![]() Chemically resistant and insoluble in common solvents, including acids oils and salts.Extremely low smoke and toxic gas emissions when exposed to flame.Naturally flame retardant, carries a V-0 flammability rating.Low outgassing, low particle generation and inherent purity yield reduced contamination.Low coefficient of friction and high wear resistance.Easy to process and lightweight compared to titanium, steel and aluminum.High abrasion and cut-through resistance plus a low coefficient of friction yields excellent wear resistance.Excellent long-term creep and fatigue properties.Excellent strength, stiffness and dimensional stability in high-temperature and harsh environments.However, compression-molded PEEK parts have lower ductility and are harder and brittle.īy adding milled glass or carbon fibers, graphite, PTFE, titanium dioxide or silicon oxide nanoparticles or other fillers, certain PEEK properties such as the abrasion resistance, coefficient of friction and surface hardness can be improved. Generally, compression-molded PEEK parts are more crystalline, giving them higher modulus and tensile strength than PEEK parts processed by injection molding. The main disadvantage of compression molding PEEK is that the cycle time is typically several hours or longer. Also, compared to injection molding, compression molding allows slower cooling, which leads to higher crystallinity and can improve performance. PEEK (polyetheretherketone) is a linear aromatic semi-crystalline thermoplastic that maintains a multitude of desirable properties at high temperatures, including excellent mechanical strength and dimensional stability, wear resistance, chemical resistance, electrical performance and hydrolytic stability.īecause PEEK can be injection molded only up to thicknesses of approximately 15-20 mm (0.059-0.079”), large-section PEEK components, especially large-diameter rods, thick-walled tubes or thick sheets, must be compression-molded.
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