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Primers or exterior wall coatings used for building interior and exterior walls must be tested for 24-hour permeability. According to the standard, the substrate used for testing must comply with the NAF (asbestos free) H (high-density) V level technical requirements in JC/T412.1-2006, and the initial permeability of unpainted test panels after 24 hours must be greater than 4ml. The special cement board for permeability testing belongs to the high-density fiber cement board system, which is a material with excellent properties such as lightweight, high flexural strength, fire resistance, heat insulation, collision resistance, and good sound insulation. It is a durable indoor and outdoor wall material that can withstand all weather conditions.

 

Standard: JC/T412.1