Process for recycling rubber

A substantially dry, particulate molding material comprising a mixture of:

• (a) recycled rubber particles, said recycled rubber particles being present in a predetermined concentration by weight;
• (b) a binder being present in a concentration at least sufficient to provide predetermined properties of said substantially dry, particulate molding material after molding;
• (c) sulfur being present in a concentration of between about 0.4 and about 0.6 percent by weight;
• and
• (d) trimethylthiuram disulfide being present in a concentration of between about 0.7 and about 0.12 percent by weight.

A process for forming a substantially dry, particulate material using a predetermined amount of recycled rubber, said process comprising the steps of:

• (a) determining a maximum amount by weight of recycled rubber to be used to form said substantially dry, particulate material;
• (b) determining a particle size for said recycled rubber;
• (c) selecting a binder for binding said recycled rubber;
• (d) determining an amount by weight of binder selected in step (c) required to be added to said maximum amount by weight of recycled rubber determined in step (a);
• (e) selecting curing agents to be used;
• (f) determining an amount by weight of said curing agents selected in step (e);
• (g) mixing said maximum amount by weight of recycled rubber determined in step (a), said binder determined in step (d) and said curing agents determined in step (f);
• (h) heating said recycled rubber, said binder and said curing agents mixed in step (g) to a predetermined temperature;
• (i) removing a mixture of said recycled rubber, said binder and said curing agents mixed in step (g) and heated in step (h).