How to choose between FR4 sheet and G10 sheet?

Fr4 Sheet (Epoxy FiberGlass sheet FR-4 grade)

Main technical characteristics and applications: stable electrical insulation performance, good flatness, smooth surface, no pits, standard thickness tolerance, suitable for products that require high-performance electronic insulation. Such as:

FPC reinforcement board, PCB drilling backing board, glass fiber meson, potentiometer carbon film printing glass fiber board, precision planetary gear (wafer grinding), precision test plate, electrical (electrical) equipment insulation stay partition, insulation backing board , Transformer insulation boards, motor insulation parts, grinding gears, electronic switch insulation boards, etc.

E3505 G10(FiberGlass G-10)

G10 material has the characteristics of insulation, corrosion resistance and wear resistance.
Can be used to craft knife handles.
G10 is a composite material made of glass fiber cloth and epoxy resin. It was originally developed as an aviation
The material of the device can withstand great force without breaking deformation.

Basis for the main differences between FR-4 and G10

The main difference between FR-4 and G10 is the electrical performance of the product, FR-4 has a temperature resistance of 125-150°, and G10 has a high strength and a temperature resistance of 160-180°