Chavant - Non Sulfurated Plasteline - 2 lb - Terra Cotta - Hard - Chavant NSP is a line of professional, sulfur free sculpting clays. Replacing sulphur minimizes difficulties associated to mold making with silicone rubber. NSP can be melted and poured at approximately 185 degrees F! Available in soft, medium and hard. In colors: Green Brown or Tan. Chavant modeling clays are used throughout a variety of industries in many different and unique ways. Chavant clays are oil / wax based, reusable, do not create dust, can be modeled by hand or machine and do not permanently harden, allowing work to continue for indefinite periods of time. The clays are not meant to be fired in a kiln or cured in an oven. In fact, when working on a project with these clay bodies, a user is not working on the final project at all. The advantage of this modeling process is that surface revisions can be made indefinitely.