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Engineering | Safe Engineering

Hydrogen Gas

What are the hazards of hydrogen gas? Hydrogen gas (CAS# 1333-74-0) is not toxic to breathe, although it can function as an asphyxiant if it displaces enough breathable air. Hydrogen gas has a low LEL and a broad flammability range, so the flammability/explosivity...

HF Acid, Ammonium Bifluoride, and Other Soluble Fluorides

I've worked with corrosives before. What makes HF and other fluorides special? The following compounds and related fluoride compounds release fluoride ions (F-): hydrofluoric acid (CAS# 7664-39-3) ammonium fluoride (CAS# 12125-01-8) ammonium bifluoride (CAS#...

Dimethyl Sulfoxide (DMSO)

DMSO is the classic polar aprotic solvent. It's used in lots of known reactions. Why should I worry? DMSO decomposes with heating, and the decomposition products catalyze further decomposition, resulting in a runaway reaction that has caused explosions resulting in...

Protected: Hydrogen Gas (old)

I've worked with flammable materials before. What makes hydrogen special? Hydrogen gas (CAS# 1333-74-0) has a low LEL and a broad flammability range. The LEL, or lower explosive/flammable limit, is the lowest volume percent in air at which the gas can flash or catch...

Thiols, Mercaptans, and Other Stench Chemicals

What is a stench chemical? Stench chemicals have an extremely foul smell that is detectable by the human nose in parts-per-billion amounts, depending on the compound. While the stench may not be known to have toxic effects, it can still negatively impact laboratory...