query on porcelain

[Dib Dave]

hi everyone just wondered if any one knows what the class AAA represents on porcelain ,does this mean best or worst grade,many thanks in advance ,Dave

[Matt]

I am unsure as to what Class AAA is, as they usually "Grade" Porcelain with a PEI ratings system, numbered 0 - 5. 0 Being light traffic and 5 being for commercial use.

Edit: After alittle more research, the PEI ratings are only for glazed porcelain. What type of porcelain do you have?

[doug boardley]

there is also the "ansi" scale that measures water absorbption, I'm pretty sure that AAA's fall into the bracket of lower than 0.5% water absorbption, which classes them as impervious