Components Type a material name to autofill from FM DS 7-31 Table D, or enter ΔHch manually.
| # | Material Name | CAS # | wt% (0–100) | ΔHch (kJ/g) | ΔHch (Btu/lb) |
|---|
Results
Method
The chemical heat of combustion of each component (ΔHch,i) is multiplied by its mass fraction and summed:
The total ΔHtot determines the aerosol classification per NFPA 30B and FM Global Property Loss Prevention Data Sheet 7-31:
- Level 1: ΔHtot ≤ 20 kJ/g (≤ 8,600 Btu/lb)
- Level 2: 20 < ΔHtot ≤ 30 kJ/g (≤ 13,000 Btu/lb)
- Level 3: ΔHtot > 30 kJ/g (> 13,000 Btu/lb)
Units
Conversion: 1 kJ/g = 430.2 Btu/lb. Enter component composition as a percent (e.g. 45 for 45 wt%); totals should sum to ~100%.
Material lookup
Built-in database covers 76 materials from FM DS 7-31 Table D. For materials not in the table, type the name and enter ΔHch directly — the value will be treated as a manual override (highlighted yellow).
Scope
Applicable to aerosol products in metal containers of 33.8 fl oz (1000 mL) capacity or less. Plastic-bodied aerosols and larger containers are addressed under different provisions of NFPA 30B and may require additional review.
Engineering aid only. This tool implements the heat-of-combustion based classification per NFPA 30B / FM DS 7-31. It is not a substitute for independent review by a qualified fire protection engineer. The user is responsible for verifying the applicability of the standard, the accuracy of component data, and the final classification.