Just a quote from Size15s about HA Type II & HA Type III -
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Size15s said:
There is no such thing as HAII.
That's like saying "Hard Anodised SOFT"
There is no such thing as HA2. There's HA (which is HA Level 3) and then there's Level 2 which is standard, not hard.
I posted this on CPF a while back:
With respect, unless some anodising expert stops by to prove me wrong, the term "HAII" is rubbish (trash, utter tosh etc)
HAII is like saying Hard Anodised soft/weak/decoration.
SureFire state that their "HA" is Hard Anodised to Mil-A-8625 Type III Class 2.
Mil Spec Type II is sulphuric acid anodising which is usually dyed provides the very basic in corrosion resistance, abrasion resistance, and dielectric properties.
Mil Spec Type III is sulphuric/oxalic acid anodising which produces a thick and dense "hardcoat". This "Hard Anodising" or hard coating provides excellent abrasion resistance and corrosion protection, but is often difficult to colour.
Something to note (found while googling)
"At a sharp corner there will be little, if any, anodic coating. This is because the coating builds perpendicularly to the aluminum substrate. At a sharp corner there is, theoretically, no substrate to build on. Imagine a sharp right angle with coating building perpendicular to each surface. At a very small area along the corner there is virtually no anodic coating thickness."
source
There is no HAII.
I hope this helps explain myself?!
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