Overview
Thick polyimide sheets are engineered thermoset polymers derived from aromatic diamine and dianhydride monomers. These sheets typically range from 0.5mm to 10mm in thickness, distinguishing them from standard polyimide films. Developed originally for aerospace applications, they now serve critical roles across electronics, semiconductor, and industrial sectors where thin films lack sufficient structural integrity. Manufactured through controlled imidization processes, thick PI sheets maintain the material's signature thermal stability while offering enhanced mechanical properties. Their dimensional stability and low outgassing characteristics make them particularly valuable in vacuum environments. Unlike thermoplastic variants, these sheets cannot be re-melted after curing.
Physical and Chemical Properties
Thick polyimide sheets exhibit exceptional thermal endurance, with continuous service temperatures up to 260°C and short-term exposure resistance reaching 400°C. Their glass transition temperature typically exceeds 360°C, outperforming most engineering plastics. The material maintains tensile strengths of 100-200 MPa even at elevated temperatures. Chemically, these sheets demonstrate remarkable inertness, resisting most organic solvents, acids, and alkalis. They show negligible moisture absorption (<0.3%), ensuring stable dielectric properties in humid environments. The UL94 V-0 flammability rating and oxygen index >36% make them self-extinguishing. However, prolonged exposure to strong bases or high-pressure steam may cause degradation.
Main Applications
In aerospace, thick PI sheets serve as thermal blankets, radome substrates, and insulation for propulsion systems. Their low outgassing meets NASA and ESA standards for spacecraft applications. The electronics industry utilizes them for high-temperature PCB substrates, coil bobbins, and chip carriers where thin films would deform. Industrial applications include bearing retainers for extreme environments, laser ablation masks, and vacuum chamber components. Emerging uses encompass electric vehicle battery insulation and 5G antenna substrates. Medical device manufacturers employ radiation-sterilizable PI sheets for implantable device components.
Safety and Storage
While polyimide itself is biologically inert, machining operations generate fine dust requiring NIOSH-approved respirators. Dust collection systems should be used during cutting or drilling to prevent airborne particles. The material contains no plasticizers or halogens, eliminating concerns about phthalates or corrosive gas emission during decomposition. Sheets should be stored horizontally in original packaging to prevent warping. Avoid stacking heavy items directly on sheets. Long-term UV exposure may cause surface embrittlement. Shelf life typically exceeds 5 years when stored properly. For critical applications, re-drying at 150°C for 2 hours before use is recommended.
B2B Procurement Guide
Key specifications to verify include thickness tolerance (±5-10%), dielectric strength (typically >100 kV/mm), and thermal conductivity (0.1-0.35 W/mK). For electrical applications, request volume resistivity data (>10^16 Ω·cm) and dielectric constant measurements at relevant frequencies. Lead times for custom formulations often exceed 8 weeks. Standard sizes range from 300x300mm to 1200x2400mm, with some manufacturers offering continuous rolls for thermoforming applications. For prototyping, consider purchasing pre-cut samples from distributors. Always confirm RoHS and REACH compliance documentation.
Related Manufacturers
- 主营：[]
- 主营：[]
- 主营：聚酰亚胺树脂粉、聚酰亚胺棒、聚酰亚胺板、聚酰亚胺树脂环、聚酰亚胺PI密封件
- 主营：绝缘材料、绝缘管材、复合材料、绝缘板材、云母板、绝缘纸板、环氧板、酚醛布板、pp板、亚克力板、FR4玻纤板、3240环氧板、变压器散热器片、变压器油箱、绝缘纸
- 主营：金属壳、pet胶带、防尘网、板式过滤器、pet薄膜、除尘器、无声撕、双面胶、高温胶带、碳筒、过滤器、包装材料、自粘带、撕膜胶带、防静电胶带、V型活性炭过滤器、充电桩防尘网、机柜防尘网
- 主营：尼龙PA板棒、聚甲醛POM板棒片、聚酰亚胺PI板棒、四氟PTFE板棒、聚丙烯pp板棒、高分子聚乙烯hdpe板棒、聚氯乙烯PVC板棒、一氟Pfa板棒、二氟PVDF板棒、三氟PCTFE板棒、聚醚酰亚胺PEI板棒、聚砜PSU板棒、聚苯砜PPSU板棒、聚苯硫醚PPS板棒、聚酯PET板棒、聚酯PBT板棒、POM+PTFE板棒、聚碳酸酯PC板棒、亚克力PMMA板棒、HPP板棒、ABS板棒、聚酰胺酸PAA溶液
- 主营：pom卷料、abs材料、pom齿轮、树脂板、尼龙板、玻纤板、绝缘板、酚醛板、塑钢板、pom板材、pps板材、板雕刻、胶木板、俊pet板、耐磨upe、upe棒材、密封圈、聚酰胺、peek-1000、白色pom、pom垫片、导电pom、聚丙烯、pet螺杆、upe圆棒
- 主营：连接器、绝缘pi棒、零件定制、耐磨板、esd板棒、纯料板、板棒型材、聚砜板棒、耐高温pi板棒、工业级板材棒、电子绝缘板棒、聚酰亚胺板材、聚酰亚胺棒材、聚醚酰亚胺板棒、聚醚酰亚胺板材、聚醚醚酮、电子电器、高阻抗静电、高温工程材、耐辐射材料、精密加工件、peek材质齿轮、特种工程塑料、高分子工程塑料
- 主营：PEEK棒、PEEK管、PCTFE棒、PEEK板、PI板、PTFE板、PA尼龙板、PEI板、PTFE棒、PEI棒、PI棒、PPS、PSU、POM、ABS、PAI、PC、PVDF、PFA、铁氟龙
- 主营：PBI、PI、PEEK、PAI、POM
- 主营：防电弧服、高压屏蔽服、消防员战斗服、聚酰亚胺、织物面料网格布
- 主营：高温零件、耐高温模具、窑炉加热装置、隔热板、保温板、硅酸铝纤维板、酸铝纤维背衬板、炉壁陶瓷纤维板、隔热陶瓷纤维板、防火耐火材料、防火隔热材料、硅酸铝针刺毯、高温耐火纤维毯
- 主营：FPC、SMT贴片、fpc、2-30层软硬结合板、高频高速板、HDI盲埋孔板、阻抗板、抄板、软硬结合板、FPC打样、透明fpc
- 主营：PEEK棒、PEEK棒材、PEEK管、PEEK板、PEEK板材、聚酰亚胺棒、聚酰亚胺板、PEEK管材、PEEK材料、PEEK加工、PEEK注塑、PEEK螺丝、PEEK齿轮、PEEK密封圈、PEEK制品、PEEK轴套、PEEK球、PEEK垫片、PEEK密封环、聚醚醚酮
- 主营：智能手机、自动化机械、沉金树脂塞孔、电路板、线路板、硬结合板、一阶打样电解箔
- 主营：PCBA方案、SMT贴片加工、fpc贴片加工、PCB电路板生产、镀金电路板加工、厚铜电路板定制、高频电路板、软硬结合板、HDI线路板、厚铜PCB、热电分离铜基板、PCB电路板贴装、软板SMT加工、ENEPIG线路板、HDI埋孔板、fpc线路板、刚柔结合板、镍钯金PCB、光模块PCB
- 主营：伊士曼、中昊晨光、杜邦、PEI板用聚酰亚胺粉、奇美、台化、基础创新、日本出光、3M、日本大金、信越化学、美国盛禧奥、阿科玛、日本瑞翁、日本积水、德国赢创、韩国SK、巴斯夫、日本三菱、日本住友、日本东丽、乐天化学、日本东洋纺、韩国LG、盛禧奥、金发科技