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Hard Anodised Composite Coatings for Aluminium Alloys

Apticote 350 hard anodized composite coatings

The APTICOTE 350 range of hard anodised composite coatings make aluminium surfaces as hard as steel. By combining the hardness of aluminium oxide with the lubrication, wear resistance and corrosion protection of fluorocarbon polymers, they impart to the aluminium surface previously unattainable properties.

The particles of the selected polymer are permanently locked within the structure of the newly formed anodised layer, resulting in a harder-than-steel, continuous lubricating polymer/ceramic surface of which the polymeric particles become an integral part.

The APTICOTE 350 Range
350L Maximum hardness & some lubricity
35OC Over 1800hrs salt-spray corrosion resistance
35OR High dielectric strength
35OF FDA compliant for food products and packaging (Non-Stick)
35OD For maximum hardness & maximum lubricity
Apticote 350 automated plating line
Automated plating line

Why is Apticote 350 the best hard anodising/polymer system?

  • Fully automated lines
  • PC controlled - fully programmable
  • Accurately controlled chemistry and maintenance
  • New, micro-scale polymer that absorbs deep into the anodised coating
  • Low noise, automated ramping, power supplies
  • Professional laboratory backup
  • Highly trained and skilled operators
  • Comprehensive quality inspection


  • Extremely low friction
  • High hardness
  • Very low wear
  • Excellent corrosion protection
  • Superb control of coating thickness
  • Completely uniform coverage
  • No post-machining
  • Non-stick
  • Non-wetting
  • Coats a range of aluminium alloys
  • Pleasing visual appearance and feel 
   coating cross section x1000

Coating cross-section, x 1000.

The protective film is created on, and within, the surface of aluminium and its alloys. The fine columnar structure of the Hard Anodised layer makes it ideal for absorbing and bonding to lubricating polymers.



There are many applications where Apticote 350 hard anodised composite coatings out-perform normal anodic coatings. The industrial sectors include:

  • Aerospace
  • Marine
  • Electronics
  • Pharmaceuticals
  • Packaging
  • Automotive
  • Pneumatics
  • Food  
Properties and Benefits
SURFACE Friction vs
Hard Steel
Aluminium Alloy 0.80
Electroless Ni 0.55
Hard Chrome 0.50
Hard Anodised 0.35
Apticote 350 0.10
Low Friction

APTICOTE 350 composite hard anodized coatings are invaluable in an un-lubricated situation. The dispersion of polymer within the layer gives low friction throughout the aluminium component life, reduces wear on the counterface and decreases frictional heating.


APTICOTE 350 composite hard anodising imparts non-stick properties to aluminium alloys, with reduced drag or torque during initial running. Polymer is also available on the coating surface to provide a start-up and assembly aid. The polymer is both oleophobic and hydrophobic, so the coatings repel water and oil and are self-cleaning. APTICOTE 350F is particularly effective in food applications.

Uniform Coverage
unifrom coverage by aptocote 350 composite hard anodising

Apticote 350 hard anodising provides a completely uniform surface layer of predictable thickness on the aluminium alloy. Component surface growth is approximately 50% of the total coating thickness, so that final dimensions can be accurately predicted. For optimum results, sharp corners should be relieved as far as possible. The benefit to the end-user is reduced machining and grinding costs, and improved precision of manufacture.

Poeton are highly skilled at jigging and fixturing, so that an even coating distribution can be achieved on complex geometrical features, including down long bores, where normal anodised layers will thin.

However, it should be noted that anodising to a specific final size requires that the as-manufactured dimensions and tolerance band are both closely controlled. Tolerances are additive, so that the final size depends more on the incoming precision than on any small variations in the anodising process. Poeton strongly recommend that parts should be anodised to a specified coating thickness rather than to a defined final size.

High Wear Resistance
* adhesive wear factors
Adhesive Wear Factors- Hard steel pin vs a
rotating coated disc - 10N/sq mm load

APTICOTE 350 hard anodized composite coatings provide superb wear protection for aluminium alloys in sliding and adhesive wear situations. It combines the hardness of the anodic layer with the lubrication properties of the polymeric in-fill, ensuring an extended component life and reduced frictional losses.

It is ideal for slideways, bearings, calibrators, where low stick-slip is required.

Substrate materials

The APTICOTE 350 composite hard anodising process can be applied to a range of aluminium alloys, so that the user can choose the substrate for its strength or corrosion properties. Best results are obtained on alloys in which the silicon content is below 10% and the copper content is below 5%.

Ideal materials for the APTICOTE 350 process are:- HE30 (6082), L65 (2014), Ll 60 (7075), DTD 735 and LM25. (Please ask us for advice prior to selecting the alloy type).

Corrosion Protection
* salt spray test data
Salt-spray test data to ASTM B177.73

Most anodic treatments increase the corrosion resistance of aluminium alloys. However, the unique APTICOTE 350 process seals as well as lubricates the aluminium surface, with a dramatic improvement in resistance to acid (to pH 4.0), alkaline (to pH 9.0) or saline environments.

For maximum corrosion protection you should specify APTICOTE 350C.

If you require exceptional corrosion protection, up to 15,000 hours salt mist, together with non-stick and FDA compliance, then our more specialised Advanced Anodic Composites are best for such applications.

More info about anodising



Poeton Industries licenses specific coating technologies from General Magnaplate and these include the highly successful 'Tufram®'. For more about Tufram®, please follow this link, and for more on General Magnaplate, follow this link.

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