I have seen high quality horizontal hot air level which was so flat (by eye) I didn't realise it was HASL until told. 
I've never seen vertical HASL that flat. 
Regards
Rex

Sent by me on my iPhone. 


> On 1 Oct 2013, at 18:26, Louis Hart <[log in to unmask]> wrote:
> 
> Technetters, in PCB fabrication with tin-lead final finish, is it easier to get solderable surface mount pads with a horizontal HASL machine than with a vertical HASL? I have thought horizontal would make it easier. Thanks for any insight.
> 
> Louis Hart
> Compunetics
> Monroeville, PA
> USA
> [log in to unmask]<mailto:[log in to unmask]>
> 412-858-1232
> 
> 
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