do you have simulation premium? because if your using standard it wont show, But i do not know if this applies to simulation professional because material properties in material web are use in non linear study.
You should have either sim pro or pre licence to access to materiality webportal. Thereafter, you can download your desire material and place it into your material database in your SW installation for leer in order to be able to use it. Alternatively, you can create a custom material based of those info from materiality. Hope it help.