Single - sided phenolic paper - based materials are widely used in the manufacturing of printed circuit boards (PCBs) due to their unique combination of properties that make them suitable for various applications. These materials are primarily composed of layers of paper impregnated with phenolic resin, which provides them with distinct characteristics.

　　One of the most notable features of single - sided phenolic paper - based materials is their cost - effectiveness. Compared to other PCB substrate materials such as fiberglass - reinforced epoxy (FR - 4), phenolic paper - based materials are significantly cheaper to produce. This affordability makes them an attractive option for low - cost electronic products, such as simple consumer electronics, toys, and some basic industrial control devices. The lower cost does not necessarily mean a sacrifice in basic functionality, making them a practical choice for applications where budget constraints are a major consideration.

　　In terms of physical properties, single - sided phenolic paper - based materials have moderate mechanical strength. They can withstand the normal handling and assembly processes involved in PCB manufacturing, such as drilling holes for component insertion and soldering. However, they are not as robust as FR - 4 materials and may be more prone to damage under extreme mechanical stress or bending. Their thermal properties also play a crucial role. These materials have a relatively low heat resistance compared to some high - performance substrates. The maximum operating temperature is typically around 105 - 125°C, which limits their use in applications that generate a significant amount of heat.

　　From an electrical perspective, single - sided phenolic paper - based materials offer acceptable insulation properties. They can effectively isolate electrical traces on the PCB, preventing short circuits. However, their dielectric constant and dissipation factor may not be as stable as those of higher - end materials, which can affect the performance of high - frequency circuits. Additionally, the moisture absorption rate of phenolic paper - based materials is relatively high. Exposure to humid environments can lead to changes in their electrical and mechanical properties, potentially causing issues such as increased leakage current and reduced mechanical strength. Therefore, proper storage and, in some cases, additional protective coatings are required to maintain their performance.