Pyrazole, also known as 1,2-diazoles, Diazene Pentacyclines, o-diazepines; is White needle-shaped or prismatic crystal, from ethanol crystallization of pyrazole is colorless needle-shaped crystal. Pyridine-like odor and pungent bitter taste, soluble in water, alcohol, ether and benzene. The boiling point and melting point of the compounds increased when there were substituents on the carbon atoms, and decreased when there were substituents on the nitrogen atoms. Chlorination, bromination, iodination, alkylation and acylation are easy to occur. The formula is C3H4N2.
Indicators | Electronic grade | Pharmaceutical grade | Pesticide Grade |
Appearance | Natural Grain Crystal | Crystallization of natural particles or mechanical granulation | Mechanical Granulation |
Content (%) , chromatographic method ≥ | 99.5 | 99 | 98.5 |
Whiteness(r457) | Natural Crystal: Colorless Transparent Crystal | Mechanical Granulation ≥60 Natural Crystal: Colorless Transparent Crystal | Mechanical Granulation ≥55~<60 |
Moisture content (%) ≤ | 0.5 | 0.8 | 1.0 |
Fe+ (%) ≤ | 0.00005 | -- | -- |
Melting point ℃ | 67.0~70.0 | 67.0~70.0 | 67.0~70.0 |
Packaging, transportation and storage:
Pyrazole is transported in sealed plastic-lined cardboard or iron drums and stored in dry, ventilated, rain-proof and sun-proof places to avoid mixing with hydroxide. Keep away from heat and open flames.