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"MIL C 5541 CLASS 1 ,CLASS 3"



2005

I WOULD LIKE TO ASK IF THE DIFFERENCE IN TONE BETWEEN A PART WHICH HAS PLATED IN ALODINE 1200 CLASS 1A AND A PART WHICH HAS PLATED IN ALODINE 1200 CLASS 3 IS A CRITERION OF THE DETERMINATION OF THE CLASS .

I WOULD LIKE TO KNOW BECAUSE THE SAME MATERIALS(SPECIFIED TO HAVE THE SAME CLASS ) THEY DIFFER IN TONE (SOME OF THEM HAVE DARK YELLOW COLOUR AND OTHERS LIGHT IRIDISH COLOUR),FROM DIFFERENCE SUPLLIERS.

I KNOW THAT THE MILITARY STANDARD DOES NOT SPECIFIED STANDARD COLOUR BUT A RANGE FROM LIGHT IRIDISH TO DARK YELLOW BUT ALSO REFERS THAT THE IMMERSION TIME IS MORE LESS IN CLASS 3 THAN CLASS 1A.

CHRISOSTOMOS MASTROGIANNITIS
MECHANICAL ENGINNER - ATHENS, GREECE
^


2005

The difference between a class 1A coating and a class 3 coating is, a class 3 coating has customer specified electrical conductivity values to suit a given application ref para 3.8 of the specification. Essentially a class 3 coating is customer specific i.e., one customer's class 3 coating may be another's class 1A. It is worth noting however that the conversion materials are qualified to a specific set of values, ref section 6 of the MIL specification. Please also note, both class 3 and class 1A coatings (regardless of colour) have to pass the same corrosion tests i.e., 168 hours salt spray.

So, to answer your question, tone or colour does not define the class of coating. However, as a rule a thicker coating has a darker colour, more corrosion protection and higher resistance values than a lighter, thinner coating. That said, colours at both ends of the spectrum must pass the 168 hours salt spray.

Richard Mosley
- UK
^

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