Detailed Explanation Of Fiberglass Electronic Cloth Categories And Performance Parameters
In the current era of rapid iteration in the PCB industry and the continuous expansion of high-end copper-clad laminates, fiberglass electronic cloth, as the core base material of circuit boards, directly determines the dielectric properties, heat resistance, dimensional stability, and yield of finished products. From ordinary consumer electronics to AI computing servers, high-end communication base stations, and automotive high-voltage circuit boards, different application scenarios have vastly different requirements for the specifications, materials, and processes of electronic cloth. Many industry practitioners only know how to purchase commonly used specifications but cannot distinguish between different categories or understand core parameters. Incorrect material selection not only increases production costs but also easily leads to quality problems such as board delamination, warping, and substandard dielectric properties.
As the electronics industry continues to develop towards high precision, high frequency, high speed, and lightweight, the fiberglass electronic cloth industry is becoming increasingly segmented, with numerous specifications circulating in the market. Clear categorization can be achieved according to weaving process, yarn type, weight, and application level, which is also the most common classification standard for industry procurement and production.
Firstly, based on yarn material and weaving specifications, the market is mainly divided into two core categories: E-grade fiberglass electronic cloth and low-dielectric fiberglass electronic cloth.
E-fiberglass electronic cloth is currently the most widely used and versatile basic product category, boasting advantages such as moderate cost, good insulation, and mature weaving technology. It is widely used in low-to-mid-end fields such as ordinary household appliance PCBs, consumer electronics motherboards, and conventional industrial control circuit boards, and also accounts for the largest share of industry production capacity. Low-dielectric fiberglass electronic cloth, as a high-end upgraded category, is further subdivided into NE fiberglass, Q fiberglass, and M-series fiberglass products, emphasizing low dielectric constant (Dk) and low dielectric constant (Df) characteristics. It is suitable for high-frequency high-speed communication, computing servers, high-end RF circuit boards, and high-frequency materials for new energy vehicles, making it a core category in high-end markets with a much higher technological barrier and added value than ordinary E-cloth.
Secondly, conventional product categories are classified based on unit area weight (grammage), which is also the most commonly used selection criterion in the industry. Commonly used specifications in the industry cover mainstream models such as 7628, 2116, 1080, and 106. Different grammage electronic cloths have significantly different thicknesses, fiberglass densities, and filler ratios. 7628 electronic cloth has a relatively high basis weight, thick layers, strong structural stability, and excellent heat resistance and mechanical strength. It is often used in thick copper-clad laminates, power boards, and high-power industrial circuit boards. 2116 is a mid-range general-purpose specification, balancing thickness and flexibility, suitable for most mid-range consumer PCB materials. 1080 and 106 are lightweight electronic cloths, with a fine surface and thin thickness, mainly used in multilayer precision circuit boards, flexible circuit boards, and miniaturized precision electronic components, meeting the demand for thinner and lighter electronic products.
Besides the basic category classification, the weaving process and post-processing methods also determine the positioning of electronic cloth categories. They are divided into plain weave electronic cloth and twill weave electronic cloth. Plain weave has a uniform and stable structure with minimal dimensional deformation, suitable for high-precision circuit boards; twill weave cloth has better flexibility and stronger bending resistance, and is mostly used for bending-type electronic substrates. The subsequent processing is divided into ordinary dewaxing electronic cloth and coupling agent modified electronic cloth. Modified electronic cloth has stronger adhesion to resin, effectively preventing delamination and blistering of the board, and significantly improving the overall lifespan of the copper-clad laminate.
After clarifying the categories, understanding the core performance parameters is key to accurately controlling the quality of electronic cloth. Each parameter directly corresponds to the performance of the downstream board.
First, dielectric constant Dk and dielectric loss Df are the most critical indicators for high-end electronic cloth. The lower the value, the less signal transmission loss, the faster the transmission speed, and the better the performance in high-frequency scenarios. Ordinary E-fiber electronic cloth has a relatively high Dk value, only suitable for low-frequency, low-speed circuits; low-dielectric series fiberglass cloth, with its ultra-low Dk and Df values, has become an essential substrate for 5G communication and AI computing boards, and is also a core direction of current industry technology competition.
Second, thickness and warp and weft density. Thickness directly affects the overall thickness of the copper-clad laminate and the wiring space. Warp and weft density represents the density of the fiberglass yarn arrangement; higher density results in a denser fabric, stronger moisture resistance and impact resistance. Precision circuit boards have extremely high tolerance requirements for warp and weft density; excessive deviation can lead to uneven etching.
Third, tensile strength and elongation at break represent the mechanical properties of the electronic fabric. Higher tensile strength makes the circuit board less prone to breakage and deformation during stamping, cutting, and welding, effectively reducing production defects. Industrial and automotive-grade electronic fabrics have the most stringent standards for this parameter.
Fourth, coefficient of thermal expansion and heat resistance. Electronic products are exposed to alternating high and low temperatures. The lower the coefficient of thermal expansion of the electronic fabric, the better its high-temperature resistance, greatly reducing problems such as warping, deformation, and circuit detachment during high-temperature welding and long-term use. This is a key reference parameter for material selection in new energy and automotive electronics.
Fifth, moisture content and wettability. Excessive moisture content can lead to air bubbles and decreased insulation in copper-clad laminates. High-quality electronic fabrics have extremely low moisture content. Wettability represents the bonding ability of the electronic fabric with epoxy resin; excellent wettability allows the resin to fully penetrate the fabric, improving the overall density and insulation performance of the board.
From the perspective of overall industry development trends, the low-end ordinary E-fiber electronic fabric market has sufficient production capacity, fierce market competition, and relatively stable prices. Meanwhile, high-end electronic fabrics, characterized by thinness, low dielectric constant, and high heat resistance, are experiencing a surge in demand driven by AI computing power, new energy vehicles, and high-speed communication industries, leading to a widening supply-demand gap and becoming the core growth driver for the industry's future.
For upstream and downstream industry players, a thorough understanding of the different types of fiberglass electronic fabrics and the practical application value corresponding to their performance parameters is crucial. This allows for precise matching of needs during procurement, strict control of raw material costs and quality, and keeping abreast of industry technology upgrades. It also enables early positioning in the high-end electronic fabric market and seizing the new round of development dividends in the electronic substrate industry.
