Concern is expressed in the lack of understanding of the critical role played by volume solids in the performance of intumescent coatings. There is no standard method for the determination of volume solids, so that it is possible that too thin a film thickness may be applied, resulting in fire protection below that which is required. It is proposed that ISO 3233: 1998 is a suitable standard. The volume solids is calculated from the measurement of the specific gravity of a coating applied and dried under real-life conditions. From this figure it is then possible to calculate the applied thickness required to achieve the specified dry film thickness and hence the intended level of protection.
Primary author(s): Brooks R
Vol.81, No.19, 2003, p.23-24
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