Search gas properties
Search by gas name, formula, CAS number or sensing technology.
| Gas | Formula | CAS | MW | LEL / UEL | Common sensing |
|---|
Select a gas
Choose a row to review its reference properties.
Use compact reference data as a starting point
The database combines physical-property references with practical gas-detection context.
Find the gas
Search by name, formula, CAS number or sensing principle.
Review key properties
Check molecular weight, approximate density and listed flammability limits.
Continue to detection
Use the suggested sensing principles as a shortlist, then verify product data.
Gas density ÷ dry-air densityPublished volume fraction in air under specified test conditionsMolecular weight supports ppm ↔ mg/m³ calculationsRelated Gas Nose tools
Gas Properties Database FAQ
Are these values suitable for engineering approval?
No. They are compact references. Verify the current SDS, standard and product documentation.
Why can LEL values differ between sources?
Test method, temperature, pressure, mixture composition and rounding can produce different published values.
Does a common sensing technology guarantee compatibility?
No. The actual product must be validated for the target gas, range, environment and interfering gases.
What do blank LEL and UEL fields mean?
The gas is listed as nonflammable under the referenced conditions or the compact table does not include a flammability range.