How did fiberglass become the material for the back covers of many mobile phones and tablets?

With the continuous development of science and technology and the increasing demand of consumers for portable electronic products, the appearance and structural parts of consumer electronic products such as mobile phones and tablets are showing a trend of being light, beautiful and high-strength, which puts forward higher requirements for materials and processes. Fiber-reinforced composite materials represented by epoxy fiberglass boards have a specific strength and specific modulus comparable to metals, and have become a popular choice for light, thin and high-strength mobile phone back cover materials.
Recently, a number of fiberglass board back cover models have been released, including vivo X200/Pro Chenye Black color matching, Xiaomi 15 Pro (rock gray, spruce green, white), iQOO 13 track version (black), etc.
In addition to the application on mobile phones, fiberglass boards continue to penetrate the tablet, e-book and other markets. The Huawei MatePad Pro 12.2-inch flagship tablet and Honor Tablet GT Pro released in the second half of the year both use lightweight and high-strength fiberglass back covers, which can achieve further thinning and weight reduction while maintaining the strength of the fuselage.