NPR-80 Series

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  • NPR-80 Series
  • NPR-90
  • NPR-5 Series
  • NPR-3300

Flex Solder Mask(2 component type)


Photo-image, alkaline developed type solder mask.
These grades have been applied for the products such as suspension in HDD, drivers of FPD, circuit board of Printer, and T-BGA, COF, TAB, with fine patterned circuit board since 1994.


There are several advantages in comparison with PI cover-lay film.


  • Performing good resistance for gold plating treatment.
  • Unnecessary to use a punching process and mold.
  • Being capable of resolving 80μm opening.
  • Enabling to construct a solder dam with 50μm
  • Enabling to execute simultaneous coat on Rigid-Flex PCB.

Ink Characteristics

Item Typical value Test Condition
Viscosity 180∼240 dPa·s VT-04 Viscometer (RION), 25deg.C
Thixotropic index 1.0∼3.0 HBT Viscometer (BROOKFIELD), η5/η50, 25deg.C

Characteristics

Item Typical value Test Condition
Pencil hardness 5H JIS K 5600
Adhesion (Cu) Class. 0 JIS K 5600 (on copper foil)
(PI) Class. 0 JIS K 5600 (on polyimide film)
Heat resistance to solder ≧ 2 times 5sec. on solder bath at 260±5deg.C
Insulation resistance ≧ 1.0 x 1012Ω 50/50μm (Line/Space), Comb type test pattern
Flexibility ≧ 1 time On polyimide film (25μm) 180deg. bending
at diameter of 0.2mm
Resistance to chemical Au plating PASS Ni 3μm / Au 0.03μm thickness
Resistance to acid PASS 10% HCI aq., 25deg.C, 30min. Dipping
Resistance to alkaline PASS 5% NaOH aq., 25deg.C, 30min. Dipping
Resistance to organic solvent PASS IPA, 25deg.C, 30min. Dipping

The value in the table is measured by NPT based on each test method, so that these values are not guaranteed.

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Standard process

Coating Pre-dry UV exposure Developing Curing
Screen Printing   70∼80deg.C
30min.		   400∼600mJ/cm²   1% Na2CO3 aq.
30deg.C
0.2MPa		   150deg.C
30∼60min.

HHBT(ID55B)




Type

Product code Color Application Features
ID43
ID43YR		 Green
Yellow		 General FPC
COF
Pickup device
(DVD,CD)
etc.		 Good flexibility
ID120
ID120YR-HF		 Green
Yellow

Good flexibility
Excellent electrical properties
Low tack

Halogen free
ID55B Blue

Excellent electrical properties
Excellent flexibility

Halogen free
ID60 Green

Excellent electrical properties
Good flexibility

UL94 V-0
ID100
ID100YR
ID100T		 Green
Yellow
Transparency		 COF
T-BGA
General FPC
etc.

Excellent electrical properties
Low tack
Halogen free (ID100T)

Please refer the technical data sheet of NPR-80 series.

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