LC Coating (PLC Polymer Carbon Film)
LC coating: a low-friction polymer carbon film with 120-300 h protection, used to stop galvanic corrosion on magnesium assemblies.
| Finish Code | TZ029 |
|---|---|
| Environmental Grade | Low-temperature vacuum plasma deposition; no waste liquid or gas emissions. RoHS compliant |
| Salt Spray Standard | 120-300 h with a metallic interlayer |
| Appearance / Colour | Dark grey to black |
| Suitable For | Phosphor-bronze spring contacts, micro springs, aluminium and copper precision parts, plastic structural parts, low-load sliding bushes |
| Features | Low friction; galvanic corrosion control; corrosion resistant |
| Environmental Compliance | REACH and RoHS compliant |
Overview
Surface finishing on a fastener is a functional coating, not a cosmetic one: it sets the friction coefficient that determines how much of the applied torque becomes clamp load, and it defines how long the part survives in a corrosive environment. Two finishes that look identical can differ by a factor of several in salt-spray hours and by enough in friction to change the torque specification. This listing: finish code TZ029, salt spray 120-300 h with a metallic interlayer, appearance / colour Dark grey to black, environmental compliance REACH and RoHS compliant.
What sets this listing apart: Environmental Grade Low-temperature vacuum plasma deposition; Features Low friction.
Advantages
Hydrogen embrittlement risk separates processes: electroplating on high-strength steel needs a de-embrittlement bake, while mechanical and flake coatings avoid the risk entirely.
Friction coefficient changes with coating: a zinc-flake coating typically runs lower and more consistently than electroplated zinc, which is why torque tables are finish-specific.
Barrier coatings protect the base metal, while sacrificial coatings protect the steel even at a scratch; the choice depends on whether the joint will be damaged in service.
Applications
Automotive underhood and body joints, outdoor equipment, marine and coastal installations, electronics hardware, and any joint where the torque specification is tied to a friction value.
Quote the standard, the hours and the acceptance criterion together — a salt-spray figure without the test method is not a specification. Check that the coating process is compatible with the core hardness of the part.
Product information is supplied by Toprecision. Custom parts can be produced to drawing — contact us for samples or a quotation.
Specifications across this series
2 parts in this series
| Part | Finish Code | Environmental Gr… | Salt Spray Stand… | Appearance / Col… |
|---|---|---|---|---|
| LC (PLC Polymer Carbon Film) · TZ029 / Low-temperature vacuum plasma deposition; no waste liquid or gas emissions. RoHS compliant / 120-300 h with a metallic interlayer | TZ029 | Low-temperature vacuum plasma deposition; no waste liquid or gas emissions. RoHS compliant | 120-300 h with a metallic interlayer | Dark grey to black |
| LC Coating (Organic Polymer Composite Dry Film) · TZ304 / REACH / RoHS compliant / 200 h and above | TZ304 | REACH / RoHS compliant | 200 h and above | Dark grey |
Values are taken from each part’s own attribute set. Changing length, material or finish changes pull-out strength and installation torque, so compare the row that matches your drawing.
Selection and test data: engagement length, standards, salt-spray hours
FAQ
What does this finish provide?
Finish Code TZ029, Environmental Grade Low-temperature vacuum plasma deposition, Salt Spray Standard 120-300 h with a metallic interlayer, Appearance / Colour Dark grey to black.
How does it affect torque and friction?
Carbon Steel.
What should I verify before ordering or installing it?
Quote the standard, the hours and the acceptance criterion together — a salt-spray figure without the test method is not a specification. Check that the coating process is compatible with the core hardness of the part.