Overview
Composite insulating paper is engineered for electrical insulation, combining cellulose fibers with synthetic resins like polyester or aramid. This hybrid structure balances flexibility with high dielectric properties, making it indispensable in power distribution systems. Its layered design often includes additives for flame resistance or thermal conductivity control. Unlike traditional insulating materials, composite paper resists degradation under prolonged electrical stress and humidity. Manufacturers tailor compositions to meet industry standards such as IEC 60641, ensuring compatibility with oil-immersed or dry-type transformers.
Physical and Chemical Properties
The material exhibits exceptional dielectric strength, typically ranging from 40–100 kV/mm, depending on thickness and resin content. Its thermal endurance class (e.g., Class B, F, or H) defines maximum operating temperatures, often up to 180°C. The paper’s low moisture absorption (<1%) prevents conductivity fluctuations in humid environments. Chemically, it resists oils, acids, and alkalis, though prolonged exposure to strong solvents may weaken bonding. Mechanical properties include tensile strengths of 50–150 N/cm², ensuring durability during winding or punching processes in transformer production.
Main Applications
Over 70% of composite insulating paper is used in transformer manufacturing, particularly for interlayer insulation between windings. Its oil compatibility makes it ideal for oil-filled transformers, while dry variants suit eco-friendly designs. Motors and generators employ it as slot liners or phase separators. High-voltage cables use thin grades for conductor wrapping, preventing short circuits. Emerging applications include electric vehicle battery insulation, where lightweight and thermal stability are critical. Specialty grades with ceramic coatings cater to extreme-temperature environments.
Safety and Storage
While non-hazardous under normal conditions, overheating may release phenolic or epoxy vapors. Work areas should have ventilation, and direct flame exposure must be avoided. Storage requires relative humidity below 65% and temperatures under 30°C to prevent delamination. Suppliers typically supply rolls or sheets in moisture-proof packaging. Inspect for cracks or discoloration before use, as defects compromise insulation performance. Dispose of scraps via incineration (with emission controls) or recycling programs for fiber recovery.
B2B Procurement Guide
Industrial buyers should specify parameters like dielectric strength, thickness (0.05–0.5 mm common), and thermal class. Request mill certificates confirming compliance with standards like NEMA MW 1000 or DIN 7735. For custom shapes, die-cutting tolerances of ±0.1 mm are typical. Bulk purchases (e.g., 1-ton rolls) reduce costs by 15–30%. Lead times vary from 2–6 weeks; expedited production may incur premiums. Chinese manufacturers dominate the market, but verify certifications (ISO 9001, UL listings) to ensure quality consistency.
Related Manufacturers
- 主营：[]
- 主营：云母板、环氧板、变压器散热器片、绝缘材料、绝缘板材、绝缘管材、绝缘纸板、复合材料、绝缘纸、变压器油箱、酚醛布板、pp板、亚克力板、FR4玻纤板、3240环氧板
- 主营：玻璃棉吸音板、离心玻璃棉卷毡、铝箔玻璃棉板、砂浆复合岩棉板、屋顶隔热棉、超细纤维玻璃棉、玻璃棉保温管壳、玻璃棉针刺毡、出口玻璃棉、铝箔玻璃棉毡、憎水岩棉板、外墙岩棉、防火岩棉、隔音岩棉、铝箔岩棉板、插丝岩棉、岩棉毡、硅酸铝针刺毯、硅酸铝保温棉、橡塑保温板、橡塑管壳、自粘橡塑海绵、聚氨酯管壳、电梯井吸音板、无碱憎水纤维布
- 主营：亚克力双面胶、纳米双面胶、EVA泡棉、棉纸双面胶、青稞纸、EVA泡棉垫、EVA泡棉胶、纳米胶带、泡棉垫、泡棉胶、耐高温双面胶、泡棉双面胶、PET双面胶、3M双面胶、汽车双面胶、EVA密封垫、EVA密封圈、EVA缓冲垫、EVA脚垫、PE泡棉胶、PE泡棉双面胶、纤维胶带
- 主营：双面胶、布基胶带、pet高温胶带、纸青稞、泡棉双面胶带、玻璃布双面胶、导电双面胶带、导热双面胶带、铝箔胶带、铜箔胶带、高温胶带、阻燃EVA、防静电泡棉、防滑胶垫、橡胶制品、塑料制品、防静电制品、包装制品、模切加工、模切冲型、屏蔽导电海绵、导电泡棉、导电海绵、全方位导电泡棉、全方位导电海绵、eva泡棉制品
- 主营：绝缘漆、绝缘磁漆、绝缘纸、绝缘带
- 主营：抽绳袋、eva泡棉、泡棉垫、快巴纸、绝缘片、绝缘垫片、防尘网、epe珍珠棉、防震海绵、泡棉摄像头、手柄保护套
- 主营：点胶dmd、无纬带、白布带、绝缘漆、绝缘纸、电缆纸、绝缘板、点胶纸、pmp电容器纸、NHN绝缘纸、NMN绝缘纸、pet复合板、绝缘加工件、绝缘套管、AHA绝缘纸、AMA绝缘纸、环氧板、收缩带、聚酰亚胺胶带、玻璃丝带、黄腊管、工字撑条、dmd预浸材料、环氧树脂网格布、pet聚酯薄膜
- 主营：保温棉、保温板、隔热棉、陶瓷纤维纸、空调管、橡塑管、防火板、保温管、橡塑板、发泡板、玻璃棉、冷热水管、橡塑海绵、保温卷毡、太阳能管、彩钢房保温、墙体隔音板、橡塑泡沫板、防火隔热板、录音棚隔音棉、中央空调铜管、铝箔保温屋顶、防潮水管保温、超细纤维卷板材
- 主营：吸音棉、吸音材料、背绒胶布、绝缘片、泡绵密封垫、防震防滑垫、硅胶/橡胶、防尘/防震双面胶
- 主营：陶瓷纤维布、聚丙烯纤维、钢结构防火涂料、陶瓷纤维纸、防火泥、柔性有机堵料、防火板、防火布、防爆胶泥、挡烟垂壁、防火涂料、挡烟垂壁防火布、石棉布、防火布 阻燃、硅钛合金防火布、玻璃纤维防火布、垂壁防火布、三防布防火布、陶瓷纤维防火布、铝箔防火布、a级防火布、高温防火布、防火密封胶、纳米气凝胶毡、防火胶
- 主营：双面胶、泡棉胶垫、硅橡胶垫、绝缘片、绝缘纸、屏敝导电贴、软木垫、水松垫、魔术贴、绒布垫、保护膜、铜箔导电自粘贴、单双面背胶、家具绒垫片、硅胶脚垫、海绵密封条、透气乳晕贴、地面保护膜、幕墙双面胶条、透明无痕胶、单面背胶、餐具垫、自粘耐磨脚垫、密封硅胶垫圈、防走光贴
- 主营：高温漆、环氧漆、三防漆、电解纸、绝缘漆、绝缘纸、绝缘膜、点胶纸、诺美纸、电缆纸、黄壳纸、弹性纸、菱格纸、青稞纸、电工纸、芳纶纸、浸渍纸、绝缘带、覆盖漆、聚酯漆、灰磁漆、环氧胶、灌封胶、稀释剂、防锈漆
- 主营：缠绕垫、高温胶、石棉垫、绝缘纸、复合带、密封纸、石墨引、隔热布、隔热带、橡胶圈、黑四氟、耐火绳、圆垫片、密封带、回转轴、石墨绳、密封绳、油盘根、乙烯垫、真空泵、石墨垫、全棉带、石棉带、氟龙板、圆编绳
- 主营：绝缘片、电机绝缘纸、绝缘膜卷材、导热硅胶片、屏蔽材料、硅胶泡棉
- 主营：铁氟龙、橡胶垫、硅胶垫、绝缘垫圈、红钢纸垫圈、防震内托、工程塑料、缓冲垫圈、耐磨组件、垫圈定制、内托定制、密封垫圈、管道密封、礼盒内衬、密封件定制、异形密封件、橡胶密封环、密封圈垫片、玩具保护层、化妆品内盒、橡胶法兰圈、礼品盒内托、耐高压垫圈、橡胶密封垫、EPDM减震泡棉