"curing" is another name for cross-linking of polymer chains. Synthetic rubber. for example, could have repeat monomeric units of styrene, butadiene and perhaps methacrylic acid to form long polymeric chains. Cross-linking, or curing, of these single chains enables a strong network of polymers to be formed. This curing is often done using sulphur-containing compounds in which case the term "vulcanisation" may be applied. The curing process gives rise to tougher, more wear-resistant and more solvent- and oil-resistant materials.