Which of the following is NOT a mineral fibrous material used for insulation?Group of answer choicesrockslagperliteglass

To determine which of the given options is NOT a mineral fibrous material used for insulation, we need to analyze each option.

1. Rock: Rocks can be used as insulation materials, such as mineral wool, which is made from volcanic rock. Therefore, rock can be a mineral fibrous material used for insulation.

2. Slag: Slag is a byproduct of metal smelting and can be used as insulation material. It is commonly used in the form of slag wool or mineral wool. Therefore, slag can be a mineral fibrous material used for insulation.

3. Perlite: Perlite is a volcanic glass that is expanded by heating. It is commonly used as an insulation material due to its low thermal conductivity. Therefore, perlite can be a mineral fibrous material used for insulation.

4. Glass: Glass fibers are commonly used as insulation materials, such as fiberglass. These fibers are made from molten glass and are known for their thermal insulation properties. Therefore, glass can also be a mineral fibrous material used for insulation.

Based on the analysis, all of the given options (rock, slag, perlite, and glass) can be considered as mineral fibrous materials used for insulation. Therefore, none of the options is NOT a mineral fibrous material used for insulation.