Know
About Your Finishing Mold
When
it comes to lubricity and mold release characteristics of finish is taken into
account, as well as the opportunity to use the coating. Some finishes mold can
increase the need for coating the mold.
There
are four standard SPI finishes: diamond, stone, paper and Blast. Each casting
surface gives a different look, from a shiny mirror-like surface (A-1 diamond)
in a fairly rough, grainy texture (sand blasting with glass beads or aluminum
oxide) . All four finished three grades as well.
The
A-1 Diamond finish is the most perfect finish available, which means it has the
lowest average roughness or the value of PR. There are no high or low peaks.
For example, a scrap paper to steel gives an RA 2-4, while a diamond A-1 is the
objective of fine quality, usually a PR or less. Roughness is almost
incalculable.