Frequently Asked Questions

Common questions on 特种工程塑料 supplied by Lingli Trading. For specific quote · TDS request, 联系我们 directly.

What is PEEK and what is it used for?

PEEK (聚醚醚酮, 聚醚醚酮) is a high-performance semi-crystalline thermoplastic with 连续使用温度erature 260°C, excellent mechanical properties, hydrolysis resistance, inherent flame retardance (UL94 V-0), and USP Class VI biocompatibility. Used in 航空航天 (aircraft brackets, rocket engine components), 医疗器械 (spinal fusion cages, surgical instruments), 半导体 (wafer chucks, CMP rings), 电动汽车电池 (cell frames), and industrial (pump impellers, valve seats).

PEEK vs PEKK –what is the difference?

PEEK (聚醚醚酮) and PEKK (聚醚酮酮) are both 聚芳醚酮 (PAEK) family polymers. PEKK has higher 玻璃化转变温度erature (Tg ~162°C vs 143°C for PEEK), higher 连续使用温度, and slower crystallization. PEKK is preferred for 航空航天 structural parts and 3D printing (higher layer adhesion). Both are supplied by Lingli Trading from China tier-1 producers.

Is PEEK FDA · USP Class VI approved for medical implants?

Yes. Medical 牌号 PEEK (Victrex PEEK 450G or Evonik Vestakeep i4 G) is USP Class VI and ISO 10993 compliant, used in spinal fusion cages (FDA cleared), trauma plates, dental implants, and surgical instrument handles. Lingli Trading supplies medical 牌号 PEEK with full traceability documentation (TDS · MSDS · DMF reference).

What is PVDF used for in lithium batteries?

PVDF (聚偏氟乙烯) is the dominant binder technology for lithium-ion battery cathodes (and increasingly anodes). PVDF binder provides: (1) strong adhesion to active material particles and current collector, (2) electrochemical stability up to 4.5V vs Li/Li+, (3) flexibility for electrode coating. PVDF also used as separator coating (ceramic-PVDF composite) for improved thermal stability. HSV900 牌号 from Arkema · Kynar is 行业 standard.

Why is LCP used for 5G 连接器s?

LCP (液晶聚合物) has extremely low dielectric loss tangent (Dk ≈2.9, Df < 0.005 at GHz frequencies) and near-zero moisture absorption, making it ideal for 高频 RF connectors, high-speed I/O connectors, and 5G mmWave antenna components. Compared to PA9T and PPA, LCP supports higher frequencies (>10 GHz) and thinner wall sections for SMT connectors. Supplied by Ticona · Celanese · Sumitomo.

What is the temperature resistance of PPSU?

PPSU (聚苯砜) has 热变形温度erature (HDT) of 207°C at 1.8 MPa, 玻璃化转变温度erature (Tg) 220°C, and 连续使用温度erature 180°C. It withstands >1000 cycles of steam sterilization (134°C autoclave) without significant 性能 loss, making it the preferred material for 医疗器械 housings, sterilizable trays, and hot-water plumbing (Bluestone · Radel from Solvay).

How is PEEK processed (injection molding · 3D printing)?

PEEK is processed by: (1) injection molding at 360-400°C melt temp, 180-220°C mold temp, requiring 耐高温erature steel tooling; (2) extrusion at similar temps for rods · sheets · filaments; (3) compression molding for large shapes; (4) 3D printing (FDM) at 380-420°C nozzle, 120-150°C bed, requiring heated chamber. PEEK must be dried at 150°C for 3+ hours before processing to prevent hydrolysis.

What is PA46 and how does it compare to PA66?

PA46 (聚酰胺 46) has higher 熔点 (295°C vs 265°C for PA66), higher 热变形温度erature (290°C vs 75°C), and better retention of mechanical properties at elevated temperatures. PA46 is preferred for SMT connectors, 汽车 under-hood parts, and 耐高温erature gears. Supplied by DSM (now Envalior) as Stanyl.

为什么选择我们e PPA instead of metal in 汽车 connectors?

PPA (聚邻苯二甲酰胺, semi-aromatic polyamide) replaces metal in 汽车 connectors because: (1) weight reduction 30-50%; (2) corrosion resistance; (3) integration of multiple functions into one molded part; (4) IR-reflow solderable (260-280°C). Glass-filled PPA (PPA-GF30 · GF50) is common. Supplied by Solvay (Amodel), DuPont (Zytel HTN), EMS-Grivory (Grivory HT).

What is the difference between PTFE and PFA?

PTFE (聚四氟乙烯, Teflon) has the broadest chemical resistance and highest 连续使用温度erature (260°C), but is not melt-processable (must be sintered or ram-extruded). PFA (Perfluoroalkoxy) is a melt-processable copolymer of PTFE, allowing conventional processing (injection, blow, transfer) at slightly higher cost. PFA is preferred for lined pipe · valve · pump where complex shapes are needed. Both supplied by Lingli Trading from China tier-1.

Is PEEK recyclable?

PEEK is technically recyclable but challenging. Production scrap (sprues, runners, off-spec parts) can be reground and re-compounded with 10-30% virgin material. End-of-life PEEK parts can be chemically recycled (depolymerization) back to monomer. However, due to high cost and long service life (often 10+ years), most PEEK parts are not actively recycled. Lingli Trading offers reground PEEK at lower cost for non-critical 应用领域.

What is the difference between PEEK and PEI (Ultem)?

PEEK is semi-crystalline thermoplastic with superior chemical resistance and fatigue performance; PEI (聚醚酰亚胺, Ultem) is amorphous with better dimensional stability and transparency. PEEK for high-stress structural parts (260°C continuous); PEI for 耐高温erature housings, sterilizable 医疗器械, and electrical insulators (180°C continuous). PEEK is more expensive than PEI. Both supplied by Lingli Trading.