Hydrazine Hydrate 80% — CHIMISCAV HH-80
N₂H₄·H₂O
Hydrazine hydrate (N₂H₄·H₂O) is a volatile oxygen scavenger and reducing agent used to protect boilers, steam circuits and closed systems against oxygen corrosion. CHIMISCAV HH-80 is an 80% hydrazine hydrate solution manufactured by CHIMI ART in Egypt. Because its reaction with oxygen forms only nitrogen and water, it adds no dissolved solids to the boiler, making it the classic choice for high-pressure steam generation, closed-system corrosion inhibition and thermal stabilisation duties.
Product Overview
Hydrazine hydrate (N₂H₄·H₂O) is a volatile oxygen scavenger and reducing agent used to protect boilers, steam circuits and closed systems against oxygen corrosion. CHIMISCAV HH-80 is an 80% hydrazine hydrate solution manufactured by CHIMI ART in Egypt. Because its reaction with oxygen forms only nitrogen and water, it adds no dissolved solids to the boiler, making it the classic choice for high-pressure steam generation, closed-system corrosion inhibition and thermal stabilisation duties.
Technical Specifications
- Chemical Formula
- N₂H₄·H₂O
- CAS Number
- 7803-57-8
- Appearance
- Clear liquid
- Concentration
- 80% Hydrazine Hydrate
- pH Range
- 9.5-11.5
- Solubility
- Fully miscible with water
- Available Packaging
- 200L drums · 1000L IBC
- Shelf Life
- 12 months
- Storage Conditions
- Cool, dark place
| Property | Value |
|---|---|
| Chemical Formula | N₂H₄·H₂O |
| CAS Number | 7803-57-8 |
| Appearance | Clear liquid |
| Concentration | 80% Hydrazine Hydrate |
| pH Range | 9.5-11.5 |
| Solubility | Fully miscible with water |
| Available Packaging | 200L drums · 1000L IBC |
| Shelf Life | 12 months |
| Storage Conditions | Cool, dark place |
Applications
Dosing Guidelines
Feed CHIMISCAV HH-80 continuously into the feedwater, typically at the deaerator storage section, in proportion to the dissolved oxygen remaining after mechanical deaeration. A maintenance residual of 0.05-0.1 ppm hydrazine in the feedwater is recommended to guarantee complete oxygen removal and support magnetite passivation. Dilute the concentrate with condensate or demineralised water in a closed day tank and dose with a metering pump. Verify the programme by regular residual-hydrazine and dissolved-oxygen testing, adjusting the feed rate to hold the target residual across all load conditions. Our technical team supports commissioning and residual-control troubleshooting.
How It Works
Hydrazine removes dissolved oxygen through the reaction N₂H₄ + O₂ → N₂ + 2H₂O. Both products are volatile, so the treatment contributes no dissolved solids and does not raise boiler-water conductivity — the reason hydrazine has long been the reference oxygen scavenger for high-pressure steam cycles. At boiler temperatures hydrazine also acts as a metal passivator: it reduces loose hematite (Fe₂O₃) to the dense, adherent magnetite (Fe₃O₄) layer that protects boiler steel, and converts cupric oxide to less soluble forms in mixed-metallurgy feed trains. Excess hydrazine decomposes at high temperature to ammonia, which is carried with the steam and raises condensate pH slightly, extending protection into the condensate return system. In closed circuits it maintains reducing, oxygen-free conditions that suppress corrosion of steel components.
Usage Tips
Store in original, tightly closed containers in a cool, dark, well-ventilated area away from oxidisers, acids and heat sources; shelf life is 12 months. As a concentrated 80% solution, HH-80 should be handled in closed systems: use chemically resistant transfer pumps, wear impervious gloves, goggles and protective clothing, and avoid breathing vapours. Never return diluted material to the original container, keep bunding and spill absorbents available, and review the Safety Data Sheet supplied with every delivery before handling.
Certifications & Compliance
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Frequently Asked Questions
Why is hydrazine hydrate preferred for high-pressure boilers?
Its reaction with oxygen produces only nitrogen and water, so it adds no dissolved solids and does not raise boiler-water conductivity. That makes it suitable for high-pressure plants where solids-contributing scavengers would force extra blowdown.
What hydrazine residual should be maintained in the feedwater?
A maintenance residual of 0.05-0.1 ppm hydrazine in the feedwater is recommended. Holding a stable residual confirms that all dissolved oxygen has been consumed and supports continuous magnetite passivation of boiler steel.
Does CHIMISCAV HH-80 increase blowdown requirements?
No. Because the reaction products are volatile, the product contributes no dissolved solids to the boiler water, so treatment does not add to the blowdown load — one of hydrazine's key advantages over salt-forming oxygen scavengers such as sulphite.
Can HH-80 be used outside boiler feedwater treatment?
Yes. It maintains reducing, oxygen-free conditions in closed heating and cooling circuits, acting as a corrosion inhibitor, and serves as a thermal and pressure stabiliser in selected industrial processes, in line with its listed applications.
How is CHIMISCAV HH-80 packaged and delivered?
It is supplied in 200 L drums and 1000 L IBCs, each delivery accompanied by TDS and SDS documentation. Store containers tightly closed in a cool, dark place; shelf life is 12 months.
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