Aerogels as Promising Thermal Insulating Materials: An Overview

Table 1

Commonly available thermal insulation materials.

S. number	Material	𝑅-value (per inch)	Green	Flammable	Remark
1	Mineral wool	𝑅—3.1	Yes	No	Does not melt or support combustion
2	Fibreglass	𝑅—3.1	Yes	No	Does not absorb water
3	Polystyrene (EPS)	𝑅—4	No	Yes	Is difficult to use around imperfections; can become costly
4	Polyurethane foam	𝑅—6.3	No	Yes	Makes a great sound insulator
5	Cellulose	𝑅—3.7	Yes	Yes	Contains the highest amount of recycled content