Flanged joints are limited to PVC-U, polyethylene, ductile, cast and grey cast iron, copper alloy and composite, and steel. An elastomeric seal supplied in a line or fitting may not be swapped for mastic or sealant. Brazing alloys for capillary joints in copper and copper alloy need at least 1.8 per cent silver, and for stainless steel at least 38 per cent silver, each with cadmium no higher than 0.05 per cent. PVC-U and PVC-M solvent joints use priming fluid and solvent cement together, never cement alone. Welded stainless joints above DN 25 use low-carbon stainless filler rods of 2 mm diameter or less.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.