What exactly is an apect ratio?

Hello Antonio ASPECT RATIO = the ratio of one dimension to another as in the ratio of the thickness of a stencil to the width of the aperture. For instance, a 10 mil aperture in a 5 mil stencil will have an aspect ratio of 2. This is aperture width divided by stencil thickness. It is generally accepted that if the ratio gets below 1.5 you're asking for trouble. The problem is poor release of the paste from the stencil because the surface tension of the paste to board cannot overcome the paste to stencil surface tension. I know the archives can be trying sometimes but if you try enough terms you will find information on the subject. While you're there you can search for a good book or two. Everybody had to start somewhere. Good luck

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