The usual recommendation is for some form of movement joint to be created in a non reinforced slab at a separation of approximately 30 times the slab thickness.
Intricate joints for granite slabs.
The two sections are then pulled together with lever operated clamps until the glue sets.
Answer countertops are to be flat within 1 8 in 10 feet.
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The seams should not split.
Joint seams widths are to be 1 16 with a tolerance of 1 64.
Seams in granite countertops are glued together using two part epoxy.
A special clamping system known as a seam puller uses a vacuum pump to attach blocks to each half of the countertop.
Transition joints from counter to wall or other material is to be 1 8 with a tolerance of 1 64.
So for a 100mm thick slab there should be some for of joint every 100m 30 3000mm every 3 0 3 6m and in a 150mm slab 150 30 4500mm 4 5 5 4m.
I ve seen installers re mix seams 3 or 4 times until they are happy with the color match.
Lippage at seams can not be more than 1 32.