Industry Standards for Metal Plating & Polishing


Process and Applicable Specifications


PROCESS/ (Metal)







BAKING (all metals)
(Hydrogen embritflement or stress relief)
Inaccordance with applicable plating specification
General specifications may require this operation before and /or after processing for hydrogen embrittlement relief, improved adhesion, or hardness, slight staining may result.
BRASS (on all metals)
Matte to lustrous
Normally preceded by bright nickle plate and post treated with a coat of clear lecquer or baked enamel.
BRIGHT DIPS (on aluminum,brass, copper)
Remove Metal
Clean for welding, pressure test, or spotwelding improves appearance of aluminium, brass and copper after processing.
CHROMIUM (all metal)
CLASS I - Decorative
TYPE I - Bright
TYPE II - Satin
CLASS 1 - orative .00001 - .00005 (plus under plate)
CLASS 2 - Engineering .002 unless otherwise specified
Decorative chrome is normally applied over copper and nickel plate. Hard chrome is plated directly to the basis metal. Parts requiring heavy deposits should be overplated and ground to the finished dimension.
CHROME PICKLE (on magnesium)
See Dow #1
CHROMIC ACID Touch Up (on magnesium)
See Dow #19
COPPER (on all major metals)
CLASS 0 - .001- .005
CLASS 1 -.001
CLASS 2 -.0005
CLASS 3 - .0002
CLASS 4 - 0001
Stop off for carburizing, shielding for brazing. As an undercoat for other plating, increase electrical conductivity to prevent base metal migration into tin (prevents poisoning solderability).
DEGREASING (on all metals)
Although degreasing will remove oils, grease, etc., it will not always remove solids, additional cleaning may be necessary.
ELECTROLESS NICKLE (on all types of metals)
CLASS I-As coated no heat treat
CLASS II- Metals not adversly affected by heat treat
CLASS III- Aluminium not heat treatable and beryllium alloys
CLASS IV- Heat treatable aluminium alloys
GRADE A- .0001 min.
GRADE B- .0005 min.
GRADE C- .0015
100 percent uniformity of plate thickness on all accesible internal and external areas. Exceptionally good for salvage purpose. Heat treatment at 500'f for one hour, should result in coastings with a Vickers hardness of 850 = 150 for class 2 applications. Note: class 2 coating should be applied to those allcys which would be affected by this heat conditioning.
GOLD on all types of metals
TYPE I-99.7% gold
TYPE II-99.0% gold
TYPE III-00.9% gold
CLASS OO-.00002
CLASS 0-.00003
CLASS 1-.00005
CLASS 2-.0001
CLASS 3-.0002
CLASS 4-.0003
CLASS 5-.0005
CLASS 6-.0015
Matle to bright yellow ro orange dependent on thickness and surface finish.
Good solderability and corrosion resistence. Normally used over nickel or silver base. Consult military specification for Proper class for intended use. Improve tarnish resistance.
NICKLE on all metals
As specified (MIL-F-14072 may be consulted for references)
Thickness as specified Colors per FED-STD-595
GRADE A .0016
GRADE B .0012
GRADE C .001
GRADE D .0008
GRADE E .0006
GRADE F .0004
GRADE G .0002
CLASS 2 as specified
There is a nickle finish for almost any need. Nickle can be deposited soft or hard, dull or bright. Corrosion resistance is related to thickness applied. Low co-efficient or thermal expansion. Slightly magnetic. Class 2 plating thickness will be .003 unless otherwise specified, but may be controlled to fit any engineering application.
Note: Class I coating that include copper undercoat are used for decorative chromium systems.
PAINTING on all metals
As specified (MIL-F-14072 may be consulted for references)
Thickness as specified Colors per FED-STD-595
Our facilities include hammertone, wrinkles, enamels, epoxys, urethanes, poly-vinyls, zinc chromate, etc.
POLISHING on all metals
Removes metal.
Satin to bright
Decorative applications. Removes surface imperfections. Bright or satin finishes.
RHODIUM on all metals
CLASS 1 - .000002 min.
CLASS 2 - .00001 min.
CLASS 3 - .00002 min.
CLASS 4 - .00010 min.
CLASS 5 - .00025 min.
Excellent abrasion resistance. Good electrical concuctivity. Hard as chromium. Will not tarnish. Excellent wear in contact areas.
SANDBLAST on all metals
(Includes Vaporblast, Glass Bead, Liquid Hone)
Removes metal
For removing scale and rust, etc., and blending imperfections. Amount of metal removed will depend on media selected. May be used for decorative and optical finishers. Provides uniform matle finish before decorative processing.
An excellent mens to label parts for identification and information.
SILVER on all metals
TYPE I - Matle
TYPE II - Semi-Bright
TYPE III - Bright
GRADE A - With supplementary tranish resistant treatment
GRADE B- Without supplementary tranish resistant treatment
.0005 unless otherwise specified
Excellent conductivity. Application of light water dip lacquer or chromate treatment per Grade A does not impair solderability. Greatly increases conductivity of lesser metals. An attractive decorative finish, particularly when base metal polished or satined.
SOLDER PLATE on all metals
.0003 - .0005 unless otherwise specified
60/40 tin-lead alloy plating. Excellent solderability. Should not be used on part of irregular configuration or with deep recesses. This process is also available for wire and strip.
TIN (all metal)
Type I -Electrodeposited
Type II- Hot dipped
Type I-No thickness is specified. Suggested thicknesses are:
.0001-.00025 for soldering
.0002-.0004 to prevent galling or seizing
.0002-.0006 to prevent formation of case during nitriding
Type II- No thickness is specified. Average will be approximately .0005 Gray to semi-bright
Excellent solderability with fair corrosion resistance. Oxides on Type I must be removed before soldering or parts must be protected by lacquer or similar finish immediately after plating. Type I parts may be fused but thickness will vary after treatment. A maximum of .0002 must be maintained to permit satisfactory fusing. Fused tin is not covered in this specification. This process is also available for wire and strip.
TIN - Bright (on all metals)
Also known as acid tin plating. Good solderability. Excellent shelf life.
ZINC (on all metals)
Type I- without supplementary chromate treatment
Type II- with supplementary chromate treatment
Type III- with supplementary phosphate treatment
CLASS 1-.001
CLASS 2- .0005
CLASS 3- .0002
Gives galvanic protection to base metal. Untreated (Type I) zinc does not maintain its bright surface for a very long period of time. Weather exposure will change zinc to a dull gray.