Hydrazine sulfate is a white or colorless crystal with the chemical formula N2H4· H2SO4, soluble in water. It is an important chemical substance with a wide range of applications in industry and scientific research.

1. Chemical synthesis: As a strong reducing agent, hydrazine sulfate is used in organic chemical synthesis to prepare a variety of compounds, including drugs, developers, plant growth regulators and some special polymers.

2. Fuel: Hydrazine sulfate is an important component of rocket fuel, especially in high-performance military and space rocket propulsion systems. It is often mixed with other fuels (such as nitric acid) and oxidizers to provide strong thrust.

3. Insecticides and herbicides: Hydrazine sulfate has been used in agriculture as an ingredient in pesticides and herbicides to help control crop pests and weeds. But these uses have been limited due to their toxicity and environmental impacts.

4. Precipitation of metal ions: In analytical chemistry, hydrazine sulfate can be used to precipitate and separate certain metal ions, such as lead, mercury, and cadmium, by forming insoluble sulfate precipitation.

5. Pharmaceutical: Hydrazine sulfate also has applications in the pharmaceutical field, and although its direct medical use has decreased, it can be used as a synthetic precursor for some drugs.

6. Rubber and plastics industry: Hydrazine sulfate is used in the synthesis of additives for certain rubber and plastics to improve their physical and chemical properties.