Rock wool is a commonly used thermal insulation material, and the bulk weight of rock wool is an important index. The bulk weight of rockwool refers to the weight per unit volume, usually in kilograms/cubic meters (kg/m³). Different bulk weight of rock wool will have different degrees of influence on its thermal insulation, sound insulation, mechanical strength and other properties.

1, the relationship between rock wool bulk weight and thermal conductivity

Thermal conductivity is an important parameter to measure the thermal conductivity of materials. For rock wool, there is a certain relationship between thermal conductivity and bulk density. In general, as the bulk weight of rock wool increases, its thermal conductivity will gradually decrease. This is because the increase in bulk density means that the fiber inside the rockwool is more compact and the porosity is reduced, which reduces the channel for heat transfer and makes the thermal conductivity lower.

However, when the bulk weight of rock wool is too high, its thermal conductivity may rise. This is because too high volume weight can cause the fiber structure inside the rockwool to become too tight, which instead blocks the transfer of heat. Under normal circumstances, choose a rock wool with a bulk weight of 80~120kg/m³, which has the best thermal insulation effect.

2, the relationship between rock wool bulk weight and mechanical properties

The bulk weight of rock wool not only affects its thermal conductivity, but also has a close relationship with its mechanical properties. Rockwool with higher bulk density tends to have higher compressive strength and tensile strength, which makes it more stable when subjected to external pressure or tension. Therefore, in some cases that need to bear a large load, such as building exterior walls, roofs, etc., rock wool materials with higher bulk weight are usually selected.

However, too high volume weight may also lead to a reduction in the flexibility of rockwool, making it prone to problems such as cracking or breakage during application. Therefore, when selecting rock wool materials, it is necessary to comprehensively consider its mechanical properties and practical application needs to ensure its stability and durability during use.

3, the relationship between rock wool bulk weight and sound insulation performance

In addition to thermal conductivity and mechanical properties, the bulk density of rockwool also affects its sound insulation performance. In general, rock wool with higher bulk density has better sound insulation. This is because the increase in bulk density makes the fiber structure inside the rock wool more compact, reducing the transmission channel of sound, thus improving the sound insulation performance.

However, it should be noted that too high volume weight may cause the sound absorption performance of rockwool to be reduced, so that some of the sound is reflected on the surface of the material rather than being absorbed. Therefore, when selecting rock wool materials, it is necessary to balance its sound insulation performance and sound absorption performance according to actual needs and application scenarios to obtain the best acoustic effect.

The bulk weight of rockwool has a significant effect on its performance, including thermal conductivity, mechanical properties and sound insulation properties. When selecting rock wool materials, it is necessary to determine the appropriate volume weight according to the actual needs and application scenarios to obtain the best performance.