The color of glass wool is bright yellow, and rock wool is dark.
2.Density and thickness
Because of the difference of the raw materials, rock wool has a bigger density than glass wool. But, glass wool has a wider choice for thickness.
Because of the difference in density, rock wool has a much better fire-resistance character than glass wool.
230 - 260 °C
700 - 850 °C
Because of the difference in heat resistance, glass wool is usually used in common buildings, shops and hosipital which do not have special requirement in fire-resistant. For some industry, which has high reuqirement for heat resistance, such as steelmaking boiler, is more suitable for rock wool.
Accroading to different country rules, import glass wool is not allowed and to some other countries, rock wool is not allowed. When you plan to import the glass wool or rock wool, please check the related rules carefully.