This report describes a laboratory study into the temperature cycling resistance of the PennguardTM Block Lining System, when using Type 55 PennguardTM Blocks.
A PennguardTM lined duct was exposed to high temperature exhaust gas from a burner, to alternate the lining temperature between ambient and 160˚C / 288˚F. The thermal cycle was repeated 1,000 times under controlled conditions.