Cosmetic Screws

UNI-SHINE

UNI-SHINE®

UNI-SHINE® is a proprietary texturing method which reveals the natural shine of stainless steel.  Available in various unique patterns and textures to suit and match the fastener’s surroundings, this cosmetic finish gives a luxurious feel to any application and offers excellent durability.

Features & Benefits

  • Available in various cuts
  • Meets RoHS requirements
  • Provides excellent resistance to wear and scratch
  • Offers long lasting finish


UNI-COLOR®

UNI-COLOR® is a special color coating that is designed and formulated to meet high-end cosmetic needs and market trends. Available in both spray paint and physical vapor deposition (PVD) techniques, this environmentally-friendly cosmetic coating offers excellent coverage and resistance against wear and corrosion.

Spray Paint
Using polyurethane (PU) paint, this coating method offers consistent coverage on screw head with no limit to the range of colors that can be developed.

Features & Benefits

  • Available in any Pantone color
  • Uniform coating thickness
  • RoHS compliance in both color coating and base material
  • Resistance to wear and corrosion on color layer


pvdPhysical Vapor Deposition (PVD) 
PVD is a vacuum coating process to produce a conformal metal-based thin film that can be uniformly deposited on electrically conductive surfaces. Using the sputtering method, a single coating layer provides ample coverage without modifying the surface profile. This technique is used in many electronic industries including optical media, optics and semiconductor components.

Features & Benefits

  • Exceptional aesthetic finish
  • Uniform coating thickness
  • Superior resistance to wear and corrosion
  • PVD coating has a high level of hardness


Unisteel Test Specifications

(Comparison between spray paint and PVD methods)

Criteria Spray Paint PVD

Abrasion resistance

  • Ukawa eraser with test load of 16.1 ± 0.05N
  • No ground exposure with a width of <2mm
  • Min 150 cycles (paint thickness 10 - 15μm)
  • Min 300 cycles (paint thickness 20 - 25μm)
  • No ground exposure with a width of <2mm
  • Min 180 cycles (coating thickness:
    1.1 ± 0.01μm)

Alcohol resistance

  • Ethyl alcohol (76.9 - 81.4%)
  • Load: 9.8 ± 0.05 N/cm2
  •  No visible change in test cloth apperance after a min. of 30 cycles
  •  No visible change in test cloth apperance after a min. of 30 cycles

Hardness (Pencil scratch test)

  • 3H at 9.8 ± 0.05 N/cm2, 45° (10mm, 5 times)
  •  No peeling, crack or flaw
  •  No peeling, crack or flaw

Chemical resistance

  • 2 min exposure in MEK
    ( 21- 25°C, 50% RH )
  •  No visible change
  •  No visible change

Extended storage duration

  • 48 hr at 65 ± 2°C, 90 - 95% RH
  • 2 hr storage at room temperature
  • Visual inspection + adhesion test
  • No peeling
  • No significant discoloration
  • No peeling
  • No significant discoloration

Environmental exposure

  • 7 hr at 65°C, 90% RH
  • - 40°C to 65°C with 40 min dwell and 17°C / min transition
  •  No visual degradation after 5 cycles
  •  No visual degradation after 5 cycles

Perspiration resistance

  • 0.05ml artificial sweat on 5 places
  • 48 hr storage
  •  No discoloration on surface
  •  No discoloration on surface

Corrosion resistance (Salt water spray)

  • 5% salt water
  • 8 hr spraying with 16 hr pause (2 cycles), followed by tape test.
  • No change in appearance
  • No peeling with tape test
  • No change in appearance
  • No peeling with tape test

 Adhesion resistance

  • Cross-cut (intervals of 1.5mm)
  • No peeling in 10% or more of a grid square
  • No peeling other than in areas near the cut
  • No peeling in 10% or more of a grid square
  • No peeling other than in areas near the cut