1. THIOUREA DIOXIDE has the following features and benefits:
does not result in flammability problems in contact with moisture as compared to traditional hydrosulfite based reducing agents
has good heat resistance stability, and its decomposition rate is milder than that of SHS even in a high temperature (80-100C), exhibits good storage stability
is very economical in use compared to traditional hydrosulfite based reducing agents (may generally be used at 1/4 to 1/5th addition rate)
fully biodegradable, protect environment with no pollution.
may be used in stripping, clearing and cleaning processes associated with most dye classes.
high reduction potential (-1340mV), economic and high efficient.
High thermal stability made the dyeing process easy to control and avoided the effluent problems associated with sodium hydrosulfite, lighter injury to fiber and less fiber loss.
no sulfurous odors. On the contrary, after decomposition of SHS, a large amount of irritating gas will be released, which seriously affects the production environment.
2. The highest reduction potential of Sodium Hydrosulfite is -1080mV, and the highest reduction potential of TD under the same condition is -1340mV, which is -260mV higher. The difference in the critical amount of each of these reduction potentials is even more pronounced, with Sodium Hydrosulfite 85% requiring 15g/l and TD 99% requiring only 5g/l. For reaching the reduction potential -1080mV of Sodium Hydrosulfite, TD 99%'s dosage is just 0.25g/l.