INTERPRETATION OF DATA
| Symbolic Rating | Depth of Corrosion Per Surface |
| A | < 0.002 inches per year ( < 0.05 mm/yr.) |
| B | < 0.020 inches per year ( < 0.50 mm/yr.) |
| C | < 0.050 inches per year ( < 1.27 mm/yr.) |
| NR | > 0.050 inches per year or explosive, not recommended. |
| Q | Questionable (probably unsuitable) |
| Blank | No data |
Conversion to milligrams per square decimeter per day (mdd). mdd= inches per year x 696 x density of metal in gm/cm3.
EXAMPLES OF CALLOUTS
| A 10-100% to 1500°F | < 0.002 in./yr. between 10% & 100%, from 70°F to 1500°F |
| AB 100% at 212°F | < 0.002 to < 0.020 in./yr., 100% concentration, at 212°F. |
| A/NR 100% at 70°F | < 0.002 to > 0.050 in./yr., 100% concentration, at 70°F. |
| A to 70°F | < 0.002 in./yr., 100% concentration, or saturated, or concentrated solution, any temperature to 70°F. |
| A to 100% to 212°F | < 0.002 in./yr., any concentration to 100%, any temperature to 212°F. |
| B 20-50% 70-140°F | < 0.020 in./yr., any concentration between 20% & 50%, any temperature between 70°F & 140°F. |
| A/NR at 70°F | < 0.002 to > 0.050 in./yr., 100% concentration, or
saturated, or concentrated solution, at 70°F. Just a few degrees of temperature difference, or percentage points of concentration, can greatly effect the corrosion rate. Combinations rated A/NR are critical regarding concentration or temperature. |
| A aqueous solution to 70°F | <.002 in./yr. to 70°F, a solution usually 10% or less concentration. |
| A dilute to 70°F | <.002 in./yr. to 70°F, a very weak solution usually 1%
or less concentration. |
COMBINATION CALLOUT
| A 100% to 70°F NR to 100% at 70°F |
Indicates that a 100% concentration is not particularly corrosive (< 0.002 in./yr.) at 70°F, but any concentration less than 100% is very corrosive. |
All metals & alloys are to be considered as annealed & stress relieved except as noted otherwise.
Note that when boiling is indicated, the boiling temperature varies with the concentration of the corrodent.* Entries prefaced with an asterisk are not specifically tested but are manufacturers' estimates based on performance with similar classes of chemicals.
Maximum use temperatures and/or concentrations listed are not necessarily upper limits of usability but are limits of data available at time of printing.
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