Through adsorption to metal surfaces while in solution, benzotriazole and tolyltriazole are able to inhibit corrosion on metal surfaces. Tolyltriazole is especially adept at creating this bond with copper and its alloys. Tolyltriazole is produced from ortho-toluenediamine (oDTA), which is a side stream in the production of toluene diisocyanate (TDI). In the recent weeks we have seen a shortage of oDTA which does not look to be subsiding soon. The main use of TDI, the material in which oDTA availability relies, is as a precursor to polyurethane foams, which has seen its demand drop drastically with the recent pull back in new construction in China. A Chinese housing boom has turned into a burst bubble with 22% of housing empty. The housing market is expected to adjust and recover, but new construction will need time to adjust and will lag in the recovery. With this has come the reduction in TDI production, and with that, oDTA. This shortage has caused a spike in the price of tolyltriazole and raised concerns over future availability.