SPI CONNECTOR BLACK™ – min lot $500

SPI Connector Black PlatingTM Advantages:

SPI Connector BlackTM is a proprietary duplex layered plating and blackening process for Electronic Connectors, Enclosures or other substrates that need to meet the stringent requirements of MIL-DTL-38999 or commercial specifications requiring Cadmium alternative coatings.

  • Compliant with WEEE, RoHS, ELV and other specifications that require Cd and Pb free deposits
  • Passes 500-750 hours Neutral Salt Spray testing on fully assembled connectors
  • Produces a matte black finish comparable to the reflectivity of Olive Drab Chromate
  • Produces a conductive coating that shows low contact resistance before and after corrosion testing

SPI Connector BlackTM is easily distinguishable from PTFE, Aluminum Electroplate and Cadmium/Olive Drab coatings. This ability to identify the coating from other cad alternatives is necessary to ensure that incompatible connections are not made in the shipyard, aircraft or vehicle assembly shops.


SPI Connector Black represents a breakthrough in Cadmium replacement technology. SPI Connector Black is a robust, deep black to matte black coating. Unlike electrodeposited coatings which are notorious for non-uniform build-up, SPI Connector Black is a conformal coating that deposits evenly on all surfaces, making it the perfect solution for intricate connector shells, small parts and larger parts with complex internal geometries.

The resulting SPI Connector Black surface, about 40 millionths of an inch thick, is a phosphorous enriched, complex black nickel oxide. Color wise, SPI Connector Black has been measured using a spectrophotometer and consistent readings between 25 and 28 are obtained. For reference, 1 is absolute black and 100 is total white.

Top Layer Composition:

Nickel: 97-99%
Phosphorous: 10-13%

Mid Layer Composition:

Nickel: 97-99%
Phosphorous: 5-7%

Finish Layer Composition:

Nickel: 97-99%
Phosphorus: 1-3%


Total Coating Thickness1:

Electrical Resistivity:

Absorption Rate:




700-800 HK100 (58—63 HRC)

0.001-0.0012 for best Salt Spray Results

< 5µΩ/in2


Lusterless to Bright black

0.91 (average, 250-2500nm)


Thermal Cycling:

Neutral Salt Spray Results:


No corrosion sites present at 500 hours

1The thickness of the coating can vary depending on the degree of protection needed. Thicknesses upwards of 0.0007 – 0.0010 inches are needed to ensure the coatings ability to pass 100 hours of salt spray, however, the coating can be as thin as 0.0003 inch.

2The resulting reflectivity and appearance of the SPI Connector Black finish is dependent on several factors including: (a) surface finish and type of base material, (b) basis metal preparation, (c) thickness and phosphorous content of the underlying electroless nickel, and (d) presence of a sealer intended to enhance corrosion resistance.

  • Exterior military components requiring resistance to wear, corrosion, and
  • Connector shells, gun magazine clips, electronic enclosures, and linear motion actuation equipment.
  • Laser and optical applications such as digital projection equipment and medical diagnostic instruments
  • Excellent coating uniformity on exterior as well as interior surfaces makes it a perfect candidate for intricate-shaped, highly precision machined components
  • Superior abrasion resistance to electrodeposited black nickel
  • Exceeds 100+ hours to corrosion resistance when salt spray tested per ASTM B 117
  • Compliant with WEEE, RoHS, ELV and other European environmental sustainability initiates
  • Can be applied to ferrous, aluminum, and copper-based substrates among others.

Capabilities & Capacities:

Rack Plating

For intricate shapes and geometries.

Wire Plating

For high volume mid-size parts, selective plating, intricate geometries.

Extensive In-house Quality and Analytical Laboratory

Chemical Analysis and Atomic Absorption, NDT, Adhesion per ASTM B 571.


Parts up to 2 feet.

*12% env fee applicable on all orders.

*Notice is hereby given that Sheffield Platers Terms and Conditions of sale, QP4.3F06 Rev D shall apply to this order and can be found here: Terms & Conditions


Contact Us For More SPI Connector BlackTM Plating Information