The chemical process that converts cardboard to CeramiBoard® improves not only its strength and fire resistance but also its acoustic properties (i.e. effectiveness as a sound barrier). Tests carried out by two
independent research institutions showed a performance better than plasterboard and fibre cement boards, at lower weight.
Low weight is a desirable feature of a wall panel, providing savings on transport, handling and in many cases foundation costs. The excellent acoustic results are described in detail in government test reports from
the Royal Melbourne Institute of Technology (RMIT) and the Commonwealth Scientific and Industrial Research Organisation (CSIRO).
In summary, the tests showed that one 14mm thick CeramiBoard® has an indicative sound transmission coefficient (STC) of 28dB, the same as 13mm plasterboard (which was 45% heavier, 10.7Kg/m2 verses 7.3 Kg/m2).
A further full-scale test of a wall unit comprising 4 layers of CeramiBoard® and 100mm thick standard fibreglass insulation (commonly used in wall cavities), produced an excellent STC rating of 54dB.
This rating comfortably exceeds the minimum requirement STC of 45dB for walls between multi-story residential units as specified by the Building Code of Australia (BCA).