Clay comes in three major categories. Water-based, Plasteline (or oil-based), and polymer.
Commonly used types of clay Edit
Chavant Le Beau Touché™ Edit
A sulfur-free plastiline which is exceptionally smooth and flexible, and has good adhesive qualities. It is also available in an "HM" variation, which is formulated to be less reactive to high temperatures, which can tend to oversoften the original formula.
Chavant NSP™ Edit
NSP, short for Non-Sulfurated Plasteline is a popular sulfur-free sculpting clay. This is an important advent, as sulfer retards the curing abilities of materials such as silicone and polyurethane. Chavant NSP comes in three hardnesses, medium being the most commonly used.
Roma Plastilina Edit
A widely available brand of plastiline sold in consistencies ranging from soft to extra-hard. Roma Plastilina contains small amounts of sulfur which can potentially interfere with the curing of various compounds. Still, some veterans say they use it regularly with no dificulties.
A brand of synthetic polymer clays that is seeing growing use in special effects work. Most popular of which for professional scultping is a newer product, Super Sculpey™, which is a firmer, carvable variation of the product which allows extremely high detail.
WED clay Edit
WED is a mixture of natural water-based clays and mineral oil (possibly amongst other ingredients), which serves to seriously extend the clay's drying time. WED is said to stand for Walter Elias Disney. It was developed to be a very smooth, slow-drying clay for his company's use in animatronics modeling and large sculpts. WED is manufactured by Laguna Clay.