Is Rock Wool Good for Container Houses?

Using rock wool in container houses is a good choice for the following reasons:

Excellent Thermal Insulation Performance

Rock wool is made primarily from natural ores such as basalt, which are melted at high temperatures and then spun into fibrous material through centrifugation. It has a low thermal conductivity, typically ranging from 0.035 to 0.045 W/m·K, effectively preventing heat transfer. Its fibrous structure creates numerous tiny air gaps, and since still air is a poor conductor of heat, this significantly increases the material's thermal resistance, with R-values usually between 3.0 and 4.5 m²·K/W, superior to organic insulation materials like expanded polystyrene (EPS) boards and extruded polystyrene (XPS) boards. In cold regions of northern China, rock wool can effectively prevent indoor heat loss; in hot and humid southern regions, its hydrophobicity and breathability prevent moisture accumulation, maintaining its insulation performance. For example, after using rock wool boards in movable prefabricated houses in mountainous areas of Guizhou, the indoor temperature can be 8 to 10℃ higher than the outdoor temperature.

Outstanding Fire Resistance

Rock wool is classified as an A1 non-combustible material, capable of withstanding temperatures above 1000℃ without melting or deforming in a fire. It can maintain the structural integrity under extreme conditions and is widely used in buildings with high fire safety requirements, such as industrial buildings, oil refineries, and chemical plants, which are high-risk locations.

Good Environmental Performance

Rock wool boards do not contain environmentally harmful substances such as asbestos, CFCs, HFCs, or HCFCs. They have been tested as non-carcinogenic, and the World Health Organization's International Agency for Research on Cancer classified rock wool products as Group 3 in 2010, indicating they do not pose a threat to human health. Their water extracts are neutral or weakly alkaline, causing no damage or corrosion to materials they come into contact with. They also meet relevant standards for radionuclides, with no restrictions on production, sales, or use.

Strong Durability

Rock wool has stable chemical properties, is resistant to aging, and does not deform easily over long-term use. Its performance remains stable during prolonged use, without decomposition or release of harmful substances. From a life-cycle perspective, the energy saved by rock wool during use is over 100 times the energy consumed in its production, transportation, and recycling processes.