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Rongalite (also known as sodium bisulfite formaldehyde dihydrate or Rongalite) is the dihydrate of sodium bisulfite formaldehyde, with the molecular formula NaHSO₂·CH₂O·2H₂O (or CH₇NaO₅S) and a molecular weight of 154.11. At room temperature, it appears as a white crystalline powder or lumps, is odorless or has a faint odor of formaldehyde / leek-like odor. It is highly soluble in water, and its aqueous solution is alkaline. It possesses strong reducing and bleaching properties. Under high-temperature or acidic conditions, it readily decomposes into toxic substances such as formaldehyde, sulfur dioxide, and hydrogen sulfide. It is primarily used in industrial applications and is strictly prohibited in food processing.
| Item | Specification |
| Melting point | 64–68 °C (lit.) |
| Boiling point | 446.4 °C at 760 mmHg |
| Density | 1.8 g/cm³ (20 °C) |
| Vapor pressure | 2.68 hPa (20 °C) |
| Refractive Index | 1.544 |
| PH | 9.5–10.5 (100 g/L, H₂O, 20 °C) |
| Solubility | Slightly soluble in alcohol (lit.). |
Jinan Jinbang Chemical Co., Ltd., strategically located within the New Materials Industrial Park in Tianqiao District, Jinan City, Shandong Province, stands as a prominent chemical innovator since its establishment in 2015. Operating from a modern, expansive 37,500 m² manufacturing facility, we are dedicated to the research & development, production, and global distribution of high-performance chemical solutions.
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