720 Rule Anodizing Calculator
You can save this page to your computer so you don't have to
come to the web site to use it - just click File | Save Page As (FF) or File
| Save as (IE).
Based on GramSlam's excel sheet for 720 rule calculations. Calculated
values are rounded to two decimal places.
To use, simply supply values for the first four numbers. The last three numbers
will be calculated as you type. You can specify the surface area in either square
inches or square feet.
The LCD process is designed for current densities between 3 and 6 amps/ft².
The 1:3 acid ratio has been successfully pushed to 12 amps/ft² with aggressive
agitation and careful temperature control.
Best dye results are obtained with a thickness between .5 and 1 mil.
Peak voltage is a function of several factors: distance from part to cathode,
acid strength, amount of dissolved aluminum in the solution, etc. Yours may
vary by several volts without necessarily indicating a problem.