Safe Solvent Replacement Technology. 21st Century Chemical founded in 1998 specializes in formulating the most advanced solvent replacement technology products available.The uses for this technology can reach into almost any application or industry that use flammable, toxic or chlorinated solvents. We are experts in identifying novel ways in eliminating problem solvents with 100% biodegradable non-toxic alternatives. Our solvent replacement technology can actually save considerable costs while reducing or eliminating hazardous waste. Our formulation criteria is to only use non-toxic non-regulated ingredients that offer superior cleaning efficiency while being easy to use.