Graphite based finish

Graphite (carbon) finishing coating is a high-strength conductive material. The coating is designed to protect effectively against the harmful environmental influence on the equipment of push-button keyboards (it is applied to landing areas). As it is a contact coating it can be combined with other finishing coatings, for example, with hot tinning HASL or ENIG (immersion gold).

It is durable, affordable, free from oxidation, has high chemical and contact resistance (2-6 ohms). In addition, carbon has a wide operating temperature range.

Application area

1. Remote control devices
2.  Radio sets and radars
3.  Calculators and PC hardware
4. Electronic toys and educational equipment

The nuances of operation and application

In case of serial production of printed circuit boards, the carbon coating is applied using a special silk screen printing method. There is the possibility of a printer to create a protective layer when producing prototypes.

Advantages of application

1. Carbon is a noble metal.
2.  Simplicity and low cost of the production process
3. High corrosion resistance to O₂, SO₂, NO_x, Cl^- and other gases.
4. It is not susceptible to moisture.
5.  Durable and safe.

Physical and technical characteristics

Technology opportunities	Index
Period of storage, months	9
Solderability quality	Good
Multiple solderability	Available
Availability of gold unwelding process compatibility	Available
Availability of aluminum unwelding process compatibility	Absent
Finishing coating thickness, μm	0,1-0,8
Optimum pitch of landing areas, mm	<0,5
Process temperature characteristics, ˚С	230-300
Torsion, bending and dimensional stability problems	Absent
Complanarity state of landing areas	Excellent
Surface cleanness state	Excellent
Corrosion resistance index	Excellent
Visual defects	Absent
Qualitative risks	No
Solder reliability index	Good
Compatibility with lea -free methods	Yes
Index of the environmental damage, safety for the human body	Low
Cost characteristics	Low

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