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The bulk density of rock wool board is a key performance indicator, which directly affects the thermal insulation, heat insulation, fire resistance and other properties of rock wool board. The following is a detailed analysis of the bulk density of rock wool board:

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1. Definition and scope of bulk density
   The bulk density (also known as density) of rock wool board refers to the mass of rock wool board per unit volume, usually in kilograms per cubic meter (kg/m³). According to publicly released information, the bulk density of rock wool board ranges widely, ranging from 40kg/m³ to 250kg/m³, but the common bulk density range is usually between 50kg/m³ and 200kg/m³.
2. The influence of bulk density on performance
   Thermal insulation performance:
   Generally speaking, rock wool board with a bulk density of 60-100kg/m³ has good thermal insulation and heat preservation performance, and is suitable for thermal insulation of building exterior walls, roofs and floors.
   Too low bulk density may lead to a decrease in thermal insulation performance, while too high bulk density may increase material costs and have limited improvement in thermal insulation performance.
   Fireproof performance:
   The fireproof performance of rock wool board increases with the increase of bulk density. When the bulk density of the board is close to 180kg/m³, better fire detection data can be obtained.
   Rock wool board with bulk density of 120-150kg/m³ has better fireproof performance and is suitable for parts that require higher fireproof performance, such as fire doors and ventilation ducts.
   Mechanical properties:
   Rock wool boards with higher bulk density usually have better compressive strength and tensile strength, and are suitable for parts that need to bear a certain load.
   However, too high bulk density may also increase the brittleness of the material and make it easy to break.
3. Recommendations for choosing bulk density
   Choose according to the purpose:
   Rock wool boards below 50kg/m³ are relatively soft and suitable for structures of special shapes.
   Rock wool boards of 60-120kg/m³ are suitable for general thermal insulation needs.
   Rock wool boards of 120-160kg/m³ have better fireproof performance and are suitable for parts with higher fireproof requirements.
   160-200kg/m³ rock wool board is suitable for large steel structure roof and exterior wall insulation and other parts that require higher mechanical properties.
   Consider cost-effectiveness:
   On the premise of meeting performance requirements, rock wool boards with moderate bulk density and low cost should be selected as much as possible.
   Avoid blindly pursuing high bulk density and resulting in increased costs and excess performance.
   IV. Precautions
   Quality control:
   When purchasing rock wool boards, ensure that the products meet the requirements of relevant standards and specifications.
   Check whether the product’s appearance quality, dimensional deviation, physical properties and other indicators meet the requirements.
   Construction specifications:
   During the construction process, operations should be carried out strictly in accordance with construction specifications and design requirements.
   Ensure that the rock wool board is installed firmly and flatly to avoid problems such as gaps and breakages.