modellable

Capable of being modelled.

features not modellable as a service, but rather as a service attribute

Capable of being moulded.

[…] applying to at least part of the bottom of the mold cavity in said drag a coating of substantial thickness of a translucent, modellable plastic mass comprising finely divided acrylate moistened with a volatile liquid that is a non-solvent of acrylate and contains only a small quantity of an acrylate solvent,

Usage and handling will soon indicate if the clay is modellable, and if it is highly plastic.