GHS07
GHS09
- H302 Harmful if swallowed
- H315 Causes skin irritation
- H317 May cause an allergic skin reaction
- H411 Toxic to aquatic life with long lasting effects
Source: European Chemicals Agency (ECHA), C&L Inventory: Carbonohydrazide (EC 207-837-2)
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Carbohydrazide — frequently asked
What is the chemical formula of carbohydrazide?
PubChem (CID 73948) lists carbohydrazide with the molecular formula CH6N4O, a molecular weight of 90.09 and the IUPAC name 1,3-diaminourea.
What is the CAS number of carbohydrazide?
Carbohydrazide is CAS 497-18-7 (PubChem CID 73948).
Is carbohydrazide soluble in water?
Yes. A US patent describes carbohydrazide as a high-melting solid that is freely soluble in water. It melts with decomposition: reported melting points are 150 °C (DSC, in the REACH dossier), 153-154 °C (Inorganic Syntheses) and 157-158 °C (the patent).
How does carbohydrazide work as an oxygen scavenger?
Carbohydrazide is dosed into boiler water to remove dissolved oxygen. US patent 4,269,717 claims at least 0.5 mole of carbohydrazide per mole of dissolved oxygen in alkaline boiler water. At high temperature it converts to hydrazine: a published study found that at 453 K and above it decomposes rapidly to hydrazine, which then acts as the oxygen scavenger, while between 398 and 428 K carbohydrazide and the hydrazine formed from it coexist. IAPWS technical guidance names carbohydrazide as an acceptable substitute for hydrazine as the reducing agent in AVT(R) treatment, added to the condensate or feedwater (IAPWS TGD9-18, Air In-leakage in Steam-Water Cycles, 2018). A boiler-water handbook lists it among the specialty volatile oxygen scavengers for boilers over 900 psig (6205 kPa), normally maintained in the parts-per-billion range.