This pertains to the ultra-smooth mirror finish of the mold surface.?SPI A-1 polishing standard, material 1.2083ESU, hardness 52-53HRC (2X 270 tempering) roughness RA to achieve what?

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Overview SPI standard for polishi Philips SPI SPI Discription Ra in um standard (old) (new) (DIN) 0 - UN - D 249 A-1 Diamond buff grade 3 0 - 0.025 1 - UN - D 249 A-2 Diamond buff grade 6 0.025 - 0.05 2 A-3 Diamond buff grade 15 0.05 - 0.076 B-1 600 grit paper 0.05 - 0.076 2 - UN - D 249 B-2 400 grit paper 0.10 - 0.127 3 - UN - D 249 3 B-3 320 grit paper 0.23 - 0.25 C-1 600 stone 0.25 - 0.30 C-2 400 stone 0.64 - 0.71 C-3 320 stone 0.97 - 1.07 4 - UN - D 249 0.40 4 D-1 Dry blast glass bead 11, 200 0.25 - 0.30

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Philips standard 0-UN - D 249 1 - UN -D 249 2-UN - D 249 3-UN - D 249 4-UN - D 249 SPI (old) 1 2 3 4 SPI (new) A-1 A-2 A-3 B-1 B-2 B-3 C-1 C-2 C-3 D-1 Overview SPI standard for polishi Ra in um (DIN) Discription Diamond buff grade 3 Diamond buff grade 6 Diamond buff grade 15 600 grit paper 400 grit paper 320 grit paper 600 stone 400 stone 320 stone Dry blast glass bead 11, 200 0 -0.025 0.025 -0.05 0.05 -0.076 0.05 -0.076 0.10 -0.127 0.23 -0.25 0.25 -0.30 0.64 -0.71 0.97 - 1.07 0.40 0.25 -0.30 Philips standard 0-UN - D 249 1 - UN -D 249 2-UN - D 249 3-UN - D 249 4-UN - D 249 SPI (old) 1 2 3 4 SPI (new) A-1 A-2 A-3 B-1 B-2 B-3 C-1 C-2 C-3 D-1 Overview SPI standard for polishi Ra in um (DIN) Discription Diamond buff grade 3 Diamond buff grade 6 Diamond buff grade 15 600 grit paper 400 grit paper 320 grit paper 600 stone 400 stone 320 stone Dry blast glass bead 11, 200 0 -0.025 0.025 -0.05 0.05 -0.076 0.05 -0.076 0.10 -0.127 0.23 -0.25 0.25 -0.30 0.64 -0.71 0.97 - 1.07 0.40 0.25 -0.30