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Diamond Mold Polishing & Finishing

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An SPI A-1 Diamond Finish is a specialty of Bales Mold Service. We use it to produce the finest finish on molds, producing highly visible or lens quality parts. The SPI A-2 is the most widely used diamond finish, providing good release and good visual parts. An SPI A-3 is a fine choice for release where a high gloss appearance is not required. All diamond finishes work well with chrome and nickel.
Bales Also Offers:
Paper Finishes: SPI B-1 to B-3
Next to diamond polishing, paper finishes are the second most refined finishes available. Paper finishes produce a slightly reflective or glossy shine and very good release. They are often recommended for products that do not require a big decorative or visual impact.
Diamond Mold Finishing
Stone Finishes, SPI C-1 to C-3
The most economical finish, stone finishes are also the first step in the process of creating both the paper and diamond finishes. Stone finishes provide good release but very little gloss to the plastic part. This is a good choice for strictly functional molded parts where aesthetics are of no importance.
Blast Finishes, SPI D-1 to D-3
When done properly, blasted finishes can produce some of the most interesting stipples and textures on mold surfaces. From a fine satin texture with varied degrees of gloss to a flat, no-gloss coarse stipple, Bales has the blast media to produce the proper finish for you. Blast finishes are also an excellent way to camouflage weld repairs and slight imperfections.

Diamond Mold Polishing & Finishing Specifications
Types of
Finishes Current SPI
Finish Numbers Description and
Previous Finish Numbers Roughness Comparison R.A.
Diamond
#3 Diamond Buff
A1
is comparable to
#1 0-1
#6 Diamond Buff
A2
is slightly finer than
#2 1-2
#15 Diamond Buff
A3
has more imperfections than
2-3
Paper
600 Grit
B1
is finer than
#3 2-3
400 Grit
B2
is slightly finer than
4-5
320 Grit
B3
is comparable to
9-10
Stone
600 Stone
C1
is finer than
#4 10-12
400 Stone
C2
is slightly finer than
25-28
320 Stone
C3
is comparable to
38-42
Dry Blasted
#11 Glass Bead
D1
is finer than
#5 10-12
240 Aluminum Oxide Blast
D2
is comparable to
26-32
#24 Aluminum Oxide Blast
D3
is a little more coarse than
190-230

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