There are four main styles of edge profiles i.e. flat, rolled, bevelled and laser.
A flat flange is where the bowl is trimmed with no further treatment to the flange other than a deburr to remove sharp edges. This provides
a flat surface which is perfect for undermounting or flush mounting but is also common for top mounting bowls that have no drainer.
As the deck from a bowl with drainer is pressed, various other edge profiles are possible.
A rolled edge is where the flange is folded back onto itself and then forms the clip rail.This is the easiest but less functional method
as the flange is less able to seal with the bench
A bevelled edge is where the flange is folded 45° and either trimmed or folded back on itself sharply to form the clip rail.This creates
a better seal with the bench and makes it slightly easier to wipe from the bench onto the sink.
A laser edge is achieved by pressing a special profile into the deck after it has been pressed.It usually slopes a few mm at 45° before
flattening for a further few mm.This allows a perfect seal with the bench and allows wiping into the sink to be very easy.With this method the clip
rail is glued on using ultra high bonding 3M products or spot welds which can show through to the flange.