When you use the chemical species model, the default number of species that can be included in Mixture Material is as follows: •R19.0 and later: up to 700 •R15.0 up to R18.0: up to 500 　 •R14.5 and earlier: up to 50 There is no limit to the number of registrations in order to register the property on the Material panel In a model that does not solve the equations of each species’ mass fraction, such as the diffusion combustion model, you can use more than the usual maximum number of chemical species. The upper limit will follow what is set in Table Parameters. The number of reactions that can be registered is Fluent 6.3 in 1500. There is no exact upper limit in later versions.