Question regarding the fire hazard classification of 40% glyoxal
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This post was last edited by Yilan Yisheng on 2009-9-9 at 14:37. According to the MSDS, its hazard characteristic is strong reducibility. It can cause combustion and explosion in the presence of high temperatures, open flames, oxidizing agents, fuming sulfuric acid, and chlorosulfonic acid. It undergoes vigorous polymerization upon contact with water, and can self-polymerize during storage and use. Glutaraldehyde, with a concentration of 40%, what is its fire classification? Thank you
Glyoxal, also known as oxalic aldehyde, is the simplest aliphatic dialdehyde in terms of molecular structure. It appears as colorless or pale yellow columnar crystals, with the molecular formula C2H2O2. Its melting point is 15°C, boiling point is 50.4°C, flash point is 220°C, and its relative density (d2020) is 1.14 g/cm3.
Based on its flash point of 220 degrees. In accordance with the fire protection design codes for buildings, it does not fall under categories A or B regarding building fires
I’ll add some relevant information: 1. Physical and chemical properties of the substance; National standard code – CAS number: 107-22-2; Chinese name: Glyoxal; Molecular formula: C2H2O2； Appearance and properties of OHCCHO: A pale yellow liquid with a slight odor. Molecular weight: 58.04. Vapor pressure: 29.3 kPa (20°C). Melting point: 15°C. Boiling point: 51°C. Solubility: Highly soluble in water, alcohol, and ether. Density: Relative density (water = 1): 1.14 ； Relative density (air=1): 2.0. Stability: Unstable. Hazard symbols: Main uses: It is employed in industries such as papermaking, textiles, pharmaceuticals, and dyes; it can also be used as a substitute for formaldehyde. 2. Impact on the environment: I. Health hazards: Routes of exposure: Inhalation, ingestion, and skin absorption. Health hazards: May be harmful to the human body if inhaled, ingested, or absorbed through the skin. Its vapor or smoke is irritating to the eyes, skin, mucous membranes, and upper respiratory tract. II. Toxicological data and environmental behavior: Toxicity: It has moderate toxicity. It has a mild irritant effect on the eye and nasal mucosa, and can cause severe vomiting in animals. Chronic poisoning can cause pancreatic damage. Acute toxicity: LD50 2020 mg/kg (oral, rats) ； 200 mg/kg (intraperitoneal in mice) Hazardous characteristic: Highly reducing. Contact with air can cause an explosion. It undergoes a vigorous polymerization reaction when in contact with water. It reacts violently with chlorosulfonic acid, ethylenimine, nitric acid, fuming sulfuric acid, and sodium hydroxide. It releases toxic and irritating smoke when burned. Combustion (decomposition) products: carbon monoxide, carbon dioxide.
The fire hazard category is determined in accordance with the building design fire protection codes, primarily based on the flash point