What is the fire rating of rock wool board

Rock wool board is an inorganic material with good fire resistance. It is widely used in the field of building fire protection. The fire resistance rating of rock wool board is Grade A, which belongs to incombustible material. It is not easy to burn, does not release heat and toxic smoke, and can also effectively block the spread of flame in case of fire. The fire endurance of rock wool board is generally about 1.5-3 hours according to the density, thickness and other factors. Some rock wool boards with good fire resistance can even have a fire endurance of 5 hours. Now let's learn about the fire rating of rock wool board.

Rock wool board is a commonly used building material with many advantages. Fire prevention is one of them. As an inorganic material, rock wool board has higher combustion performance than organic materials. What is the fire rating of rock wool board?

1、 What is the fire rating of rock wool board

According to the current national building fire protection requirements, the external wall insulation of buildings uses insulation materials with a burning performance of A or A1. As the preferred building material for the external wall, rock wool board has a fire protection rating of A, which belongs to incombustible materials and does not release heat and toxic smoke. In case of a fire, it can also effectively block the spread of flame, with excellent fire protection performance; In addition to good fire resistance, rock wool board also has good thermal insulation function, so it is widely used in building exterior walls and other fields.

2、 The fire endurance of fireproof rock wool board is several hours

As a building material, fireproof rock wool board also has a fire resistance limit. The fire resistance limit refers to the time taken by building components, accessories or structures from being exposed to fire to losing their bearing capacity, integrity or thermal insulation under standard fire resistance test conditions. Generally, the unit is hours. How many hours can fireproof rock wool board last?

In general, the unit weight of the fireproof rock wool board will be different according to its density, which will also affect the flame retardant value of the rock wool board. In addition, the thickness of the fireproof rock wool board will also affect its fire resistance limit. Under normal circumstances, the fire resistance of rock wool boards with the same thickness varies from 1.5-3 hours depending on the density, unit weight and other factors. Some rock wool boards with good fire resistance have excellent fire resistance, even up to 5 hours.