Yilong insulation materials (subsidiary of Shandong Sida Industry Co.,Ltd.) has built a strong reputation since its inception in 1966 as a state-owned factory in Zhucheng, Shandong. Through significant transformations—including a pioneering shift to a joint-stock cooperative system—it evolved into a modern corporation with a registered capital of ¥61.56 million, over 1,300 employees, and total assets around ¥320 million .
A vertically integrated industrial group, Yilong comprises three key divisions: insulation materials, textiles and glass fiber. The insulation materials arm alone has an annual production capacity exceeding 13,500 tons, serving over 20,000 enterprises in the electric, electronics, and machinery industries. Since 2001, Yilong has also exported laminated insulation materials to markets like North America, South Korea, and Western Europe, Russia, Latin America and etc with export revenues surpassing USD 2.6 million .
The company’s main laminated insulation products include:
Epoxy Glass Cloth Laminated Sheets
Epoxy Glass Cloth Laminated Rods and Tubes
Phenolic Cloth Laminated Sheets
Phenolic Cloth Laminated Rods and Tubes.
Phenolic Paper Laminated Sheets
Phenolic Paper Laminated Rods and Tubes.
Mica products
Insulation Papers
Engineering Plastic Sheets, rods and tubes
Glass Fiber Fabrics
Equipped with modern infrastructure—hydraulic presses, plastic production lines, mica processing units, and an in-house glass fiber mill producing around 3,000 tons annually—Yilong Electrical Insulation maintains tight control over both material quality and cost efficiency .
Listed among the Top 100 Chinese insulation material manufacturers, Yilong holds a strong competitive position thanks to its comprehensive production capacity, integrated raw‑material sourcing, and dual focus on domestic and export markets .
Yilong aims to further strengthen its R&D, expand export channels, and reinforce its position in both high‑end insulation lamination and fiber - based industrial materials. With a robust legacy and diversified operations, the company is poised to continue supporting industrial clients with reliable, high‑performance insulation solutions.
For technical information or business inquiries, contact us at yilong@yilonginsulation.com.
As one of the most widely used insulating materials in the electronics industry, FR4 epoxy fiberglass laminate sheets are fundamental to the production of printed circuit boards (PCBs) and numerous electrical components. Their manufacturing process combines advanced materials engineering, precision processing, and rigorous quality control to deliver consistent, high-performance results. From the preparation of raw materials to final inspection and packaging, every step is carefully managed to ensure these laminates meet the demanding standards of global electronics production.
FR-4 is a widely used composite material in the electronics industry, primarily serving as a substrate for printed circuit boards (PCBs). The designation “FR-4” refers to a flame-retardant (FR) glass-reinforced epoxy laminate, where the “4” indicates the thickness of the woven glass fabric in ounces per square foot. The glass fabric provides structural strength and rigidity, while the epoxy resin binds the layers together, creating a durable and reliable composite material. FR-4’s flame-retardant properties make it resistant to ignition and self-extinguishing under flame exposure, ensuring enhanced safety in electronic applications.
In the rapidly advancing world of electronic engineering, FR4 Composite Copper Clad Laminates (CCL) have solidified their position as the backbone of printed circuit board (PCB) manufacturing. As technology evolves toward higher performance, miniaturization, and energy efficiency, FR4 CCL continues to serve as a critical enabler of innovation in telecommunications, consumer electronics, automotive systems, and industrial automation.
3021 Phenolic Paper Laminates are high-performance composite materials produced by impregnating cellulose-based paper with phenolic resin, followed by a controlled hot-pressing process. These laminates are widely used in electrical insulation and mechanical engineering due to their reliability, durability, and cost-effectiveness. Compared to fabric-based phenolic laminates, 3021 laminates feature a dense, smooth surface that ensures excellent dimensional stability and uniform thickness, making them suitable for components requiring precise machining.
Phenolic Cotton Cloth Laminated Sheets, also known as textolite sheets or bakelite cotton boards, have long been a cornerstone material in electrical insulation and mechanical engineering applications. By combining the mechanical strength of woven cotton fabric with the chemical durability of phenolic resin, these composites deliver exceptional performance in demanding industrial environments. Engineers, manufacturers, and procurement specialists rely on phenolic cotton laminates for transformer components, electrical equipment insulation, and high-stress mechanical parts. Understanding their properties, applications, and sourcing considerations is essential for optimized industrial design and manufacturing.
In the continuously evolving world of electrical insulation and engineering materials, phenolic laminates remain one of the most widely used thermosetting composites. Among them, Phenolic Paper Laminates and Phenolic Cotton Cloth Laminates stand out as two major categories, each designed to meet specific mechanical and electrical performance requirements. Understanding their differences is crucial for engineers, procurement specialists, and manufacturers when selecting materials for various industrial applications.
POM Sheet and POM Rod are high-performance engineering plastics made from polyoxymethylene. Known in the industry as acetal plastic, POM material, or acetal copolymer/homopolymer, they are widely used in precision manufacturing due to their outstanding strength, wear resistance, and excellent dimensional stability.
In today’s rapidly developing electrical and electronic industries, high-performance insulation materials play a crucial role in ensuring equipment reliability and safety. Among these materials, EPGC308 epoxy fiberglass sheet stands out for its exceptional combination of mechanical, thermal, and electrical properties. Produced by Qingdao YILONG New Materials Co., Ltd., this advanced laminate has become a preferred choice for a wide range of industrial applications.
In today’s fast-paced world of materials science, EPGM203 has emerged as a new-generation glass mat reinforced epoxy laminate known for its exceptional balance of mechanical strength, electrical insulation, thermal stability, and chemical resistance. Developed for high-temperature and high-stress environments, EPGM203 offers engineers and manufacturers a reliable solution where traditional plastics, phenolics, or metals fail to perform. With its superior durability and design flexibility, this material has become a preferred choice in industries such as electrical engineering, automotive manufacturing, construction, and medical equipment.
Acetal plastic, also known as polyoxymethylene (POM), is a high-performance engineering thermoplastic widely used across industrial applications. This semi-crystalline material combines excellent dimensional stability with remarkable strength, making it suitable for parts that require stiffness, precision, and durability. Acetal retains its shape under continuous use at elevated temperatures and withstands mechanical stress, impact, and friction-related wear.
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