At Alpha Anodising we understand that Anodising can seem a complicated process and so have created the following check list to aid our customers.  

We have created the below checklist to help you consider your requirements and to ensure you get the specification and finish you require as a result.

Please contact us.


Tell us the anodising process that you require be it hard anodising or standard sulphuric acid anodising, is there a specific British Standard, Defence Standard or Military Specification that needs to be achieved?

  • Material

    We will need to know what grade of aluminium you are using to ensure the right process is carried out to identify if there are any potential material based issues to consider.

  • Masking

    Are there any areas on the part which need to be free from anodising such as grounding points, tolerance bored or threaded holes?

  • Pre Treatment

    Do you require any pre-treatments such as Polishing, Brushing, Bead Blasting, Etch or Chemical Brightening?

  • What parts do you have for anodising?

    Firstly specify your parts, the quantity of and provide any drawings you may have.

  • Jigging

    Where can the part be held from? Where are Jigging marks permissible?

  • Post Treatment

    After Anodising do you require your work to be Dichromate Sealed, dyed a specific colour of P.T.F.E. coated etc?

  • The required film thickness

    We need to know how much anodic coating you require,. Remember that typically the thicker the coating the more protected your parts are. Don’t forget any tolerances must be taken into consideration at this point.

    Since aluminium converts rather than deposits, some of the thickness of the coating penetrates into the material and some of the thickness is growth out of the material and therefore added to the surface.

    A good rule of thumb is that 50% of the anodic film is below the original surface and 50% is above. So a part that is anodised with a coating thickness of 10µm per surface would only have about 5µm of growth per surface.