Characteristics of DH-001C

DH-001C is a new kind of photoimageable etching and plating resist ink. Its excellent coating ability can be totally shown via various coating methods. Sharp definition, high accuracy and very minor under cut . It extremely suitable for corrosion in stainless steel. The special characteristic is acid resistant ink which also good for alkaline resistance.

DH-001C

Etching Resist Ink has such features as below:
•Good adhesion and coverage power to copper clad of boards.
• Leveled ink coating with no separation, blistering void or pin-hole.
•Very good etching resistibility to ensure sharp definition of circuit without burring.
•Super high accuracy enables the minimum conductor width/clearance to 2/2mil (0.05/0.05mm)
•Remarkable mechanical properties like hardness, adhesion, wear resistance etc.
• Wide operating tolerance limits reduces the percentage of rework and reject.
•High photographic sensitivity reduces the degree of undercut.
• Easy removal of ink thus less the pollution.
•Low irritating to skin and eyes.
•Acid-resistant value: PH value 1-9, etching time less than 20min under 45±5℃

Example of operation process:

1.Ink mixing
Mixing(Shaking) well for 5-10 min.

2.Pretreatment
Mechanical brushing or acid treatment.

3.Screen printing
a.Use nylon, polyester or stainless steel screen for printing
b.100-250 mesh/inch.
c.Rubber/Polyurethane (PU) Squeege with the hardness of -65-75 .
d.Printing Angle 70-80
e.Film thickness: 8-16 um

4.Precure
First side 75±5℃ x 4 min
Second side 75±5℃ x 5-10 min
Both side cure at the same time 75±5℃ x 10-15 min

5.Exposure
Energy required from UV rays:100-200mj/cm2
Photographic sensitivity :300-500nm
(Photosensitivity: 6-9 step)

6.Developing
By 1% sodium carbonate (Na2CO3) solution
Spraying pressure:2-3 kg/cm2
Temperature: 30℃
Time: ≤60 sec.

7.Stripping
The coating could be stripped completely with 3-5% NaOH solution at 45-50℃;
Spraying pressure 2-3kg, 1-2 min

Specification