{"id":7230,"date":"2026-04-15T09:16:18","date_gmt":"2026-04-15T09:16:18","guid":{"rendered":"https:\/\/le-creator.com\/?p=7230"},"modified":"2026-04-15T09:35:44","modified_gmt":"2026-04-15T09:35:44","slug":"peek-vs-ultem-pei","status":"publish","type":"post","link":"https:\/\/le-creator.com\/de\/blog\/peek-vs-ultem-pei\/","title":{"rendered":"PEEK vs. Ultem (PEI): Eigenschaften, Bearbeitbarkeit und wann jeweils zu verwenden"},"content":{"rendered":"
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PEEK vs. Ultem (PEI): Engineering Data for Smarter Material Selection<\/strong><\/p>\n

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Quick Specs: PEEK vs. Ultem (PEI)<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n
Full Name<\/td>\nPolyether Ether Ketone<\/a><\/td>\nPolyetherimide<\/a> (PEI)<\/td>\n<\/tr>\n
Trade Name<\/td>\nVictrex PEEK, KetaSpire<\/td>\nSABIC Ultem 1000 \/ 2300<\/td>\n<\/tr>\n
Structure<\/td>\nSemi-crystalline (~35% crystallinity)<\/td>\nAmorphous<\/td>\n<\/tr>\n
Max Continuous Service<\/td>\n260\u00b0C (500\u00b0F)<\/td>\n170\u00b0C (338\u00b0F)<\/td>\n<\/tr>\n
Glass Transition (Tg)<\/td>\n143\u00b0C (289\u00b0F)<\/td>\n217\u00b0C (423\u00b0F)<\/td>\n<\/tr>\n
Tensile Strength<\/td>\n100 MPa (14,500 psi)<\/td>\n85 MPa (12,300 psi)<\/td>\n<\/tr>\n
Dielectric Strength<\/td>\n480 V\/mil (ASTM D149<\/a>)<\/td>\n830 V\/mil (ASTM D149)<\/td>\n<\/tr>\n
UL 94 Rating<\/td>\nV-0 (inherent)<\/td>\nV-0 (inherent)<\/td>\n<\/tr>\n
Material Cost<\/td>\n$500\u20131,000\/kg <\/td>\n$100\u2013250\/kg <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

The choice between PEEK and Ultem (PEI) presents perhaps the most common thermoplastic material selection dilemma faced by high-performance thermoplastic engineers. Both plastics manage high temperature, withstand harsh chemicals and carry multiple industry approvals including aerospace and medical hardware. But comparisons of Ultem against PEEK reveal stark contrasts in molecular structure, thermal ceiling, electric properties and cost. While Ultem and PEEK both offer superb properties at elevated temperature, differences in strength, stiffness, chemical limits, electrical characteristics and machinability often favor one polymer or the other in a given application. This decision guide explains every one on each property dimension with actual statistics, shopfloor machining parameters, and a decision tree that matches operating conditions with the correct thermoplastic. If background on PEEK CNC machining<\/a> capability is what you require, that page covers PEEK grade options, tolerances and lead times.<\/p>\n

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\u2714 PEEK Advantages<\/strong><\/p>\n