Rock wool strips are made from natural basalt as the primary raw material. After high-temperature melting and centrifugal fiberization, rock wool boards are cut into strip form, with fibers arranged perpendicular to the board surface.
Class A Non-Combustible - Building a Fire Protection Barrier
Rock wool is an inorganic silicate material with a combustion performance rating of Class A non-combustible according to GB8624-2012. In the event of a fire, rock wool strips do not burn, produce molten droplets, or release toxic smoke. They effectively block the spread of flames along the external wall insulation system. Multiple systematic fire performance tests conducted by regulatory research groups have demonstrated that fire barriers made of rock wool strips deliver the most outstanding fire resistance, and are explicitly recommended as the preferred solution.
High Tensile Strength - Ensuring System Safety
In conventional rock wool boards, fibers are arranged parallel to the surface, resulting in relatively low tensile strength perpendicular to the board. In contrast, rock wool strips reorient the fibers vertically to the wall surface, achieving a perpendicular tensile strength of over 80 kPa. This level of strength fully meets the mechanical safety requirements of external thermal insulation systems, ensuring long-term stability under wind loads, self-weight, and thermal stress.
Dual Function: Thermal Insulation and Fire Protection
Rock wool strips have a thermal conductivity of ≤0.048 W/(m·K). Although slightly higher than that of organic insulation materials, their typical width (around 300 mm) means they have minimal impact on the overall thermal performance of the wall. At the same time, building codes require that the thermal resistance of fire barriers be no less than 40% (for hot summer & cold winter regions) or 50% (for severe cold regions) of the total insulation system. Rock wool strips fully comply with these requirements.
From Passive Fire Protection to Proactive Design
Fire barriers have evolved from a passive safeguard into a standard configuration in external wall insulation systems. With their inherent Class A non-combustibility, high tensile strength due to vertical fiber orientation, and proven fire performance through extensive testing, rock wool strips are the optimal choice for fire barrier applications. In an era where building energy efficiency and fire safety are equally critical, selecting the right materials and ensuring proper installation are essential to truly safeguarding lives and property.
