Silica aerogel thermal insulation material is a new type of thermal insulation material, with excellent thermal insulation, sound absorption, fire resistance and high temperature and other properties. The density of silica aerogel insulation material is one of the important parameters affecting its performance, and its density is usually between 0.01 and 0.1 grams/cubic centimeter, which makes it one of the lightest solid materials known at present.

The reason why the density of silica aerogel insulation material is so low is very much related to its unique internal structure and preparation method. Silica aerogel was prepared by sol-gel method and supercritical drying technology. During preparation, the water molecules in the gel evaporate when heated and dried, leaving many tiny pores, usually with a porosity of more than 90%. These pores can reduce the density of the material and block the conduction of heat and sound, thus achieving thermal insulation and sound absorption effects.

The low density gives silica aerogel insulation the following advantages:

1, excellent heat insulation performance

Because there are a large number of pores and pores inside the silica aerogel, the flow of air in the material is hindered, which effectively prevents the transfer of heat, thus effectively improving the thermal insulation performance.

2, good acoustic performance

As sound waves pass through the material, the pore structure absorbs and scatters the energy of the sound, reducing the propagation of noise. This gives silica aerogel potential in noise control and can be applied in places where noise reduction is required, such as conference rooms, factories, etc.

3, excellent fire performance

Due to the low density and high porosity of silica aerogel, silica aerogel can effectively isolate the transmission of heat and prevent the spread of fire. Therefore, it is often used as a fire insulation material in the construction and industrial fields to provide additional safety protection.

In practical applications, silica aerogel insulation materials have been widely used in aerospace, construction, automotive and other fields. For example, in the field of construction, the application of silica aerogel insulation materials to building external walls, roofs and floors can effectively reduce the energy consumption of buildings and improve the insulation performance and energy saving effect of buildings. In the aerospace field, silica aerogel insulation materials can be used in the thermal insulation layer and thermal protection system of spacecraft to provide guarantee for the reliability and safety of spacecraft.

The low density of silica aerogel insulation material is its unique feature, which makes it have excellent thermal insulation performance, sound absorption performance and fire resistance, and has a wide application prospect in construction, industry, aerospace and other fields.