Anodising is an electrolytic process that produces a tough and corrosion resistant oxide finish on aluminium and titanium. The coating can also be coloured to produce a decorative finish.

At Frost we have invested in a high-technology production capability offering a range of sulphuric acid and hard anodised finishes to meet the demanding technical requirements of industries such as aerospace, defence, space and precision engineering.

Coatings are available to meet all kinds of decorative, corrosion protection, hardness, wear resistance, low friction, anti-galling and chemical resistance requirements.

Anodised coatings are complimented by a range of sealing methods. At Frost we are aware of the impending REACH directive and as such can offer fully compliant alternatives to the traditional d-chromate / duplex seals, these being Nickel Acetate, Hot DI water, PTFE & our very own Trivalent Seal process. All of which can be combined with dyed coatings. We also offer REACH & RoHS compliant conversion coatings.

We are happy to work with customers to develop bespoke solutions for specific requirements and will invest in new plant to support this, if it leads to ongoing business.

To meet the requirements of aerospace and defence customers, we are accredited to AS9100.

Quality Management System BS EN 9100:2003, ISO 9001:2000

We have also committed to the SC21 supply chain improvement programme.

The anodising processes on offer from Frost are:

Sulphuric anodising

Typically for decorative applications, to specifications including Def Stan 03-25, Mil-Std-171, BS1615

Hard Anodising

A thicker, tougher and harder sulphuric coating requiring precision process control and which gives a high degree of wear resistance. Specifications include Def Stan 03-26, Mil-A-8625 Type III, BS5599

PTFE impregnation

PTFE can be incorporated during the hard anodizing process to give a low friction coating which also has good hydrophobic and lipophobic properties

Conversion coatings include:

Iridite NCP & Surtech 650

Chromic conversion coatings giving short-term corrosion protection and meeting specification Mil-C-5541


To remove metallic contamination from the surface of stainless steel. Specifications include QQ-P-35, SAE AMS 2700