Heat resistant solder resist ink(For FPC)
TAINEX HRS-1-5G Green Alkaline development typeUnder
development
Flexible as well as heat-enduring
This is an ink dedicated for use with flexible substrates due to its superb durability against bending.
-
Feature flexibility：No crack was detected after continued heating at 150℃for 1000 hours under the bending state
(curvature radius R = 0.1). - Feature Warp：Warping of substrates after heating will be smaller than general products.
Feature flexibility
Continuously heating the inflected product.
-Inflection: curvature radius R=0.1
-Heating: continuous heating at 150 deg. C
The general resistor ink substrate revealed cracks after heating at 150°C for 24 hours under the bending state, but HRS-1-5G had no cracks even after heating at 150°C for 1000 hours.
Feature Warp
Heating at 150℃ for 24Hr
These pictures reveal that the substrate warping is smaller than the general resist after heating at 150°C for 24 hours.
■Coating film performance
| Item | Test method |
HRS-1-5G (Under development) |
|---|---|---|
| Hardness | JIS K5600-5-4 | H |
| Adhesion | JIS K5600-5-6 | Category 0 |
| Bending resistance | JIS K5600-5-1 180°inflection | OK（R0.1） |
| Solvent resistance | Isopropyl alcohol, 5Min immersion at room temp. | OK |
| Acetone, 5Min immersion at room temp. | OK | |
| Acid resistance | 10% sulfuric ,30 Min immersion at room temp. | OK |
| Alkaline resistance | 5% sodium hydrate, 5 Min immersion at room temp. | OK |
| Solder resistance | JIS C6471 260 deg.C for 20 Sec. | OK |
| Gold plating resistance |
Electroless nickel gold plating process （Ni：3μm、Au：0.05μm） |
OK |
| PCT | 121 deg. C for 9 Hr | OK |
| Light reflection rate |
Measurement by colorimeter (SCI system) (Measurement range: 360-740nm) |
- |
| Radiation rate |
Measurement by heat radiation rate meter (Range: 3～30μm) |
80% |
| Combustibleness | UL94 standard | VTM-0 eq. |
| Total amount of chlorine | Calculated from material used (calculated value) | 60.6ppm |
■Electronic characteristics
| Item | Test method |
HRS-1-5G (Under development) |
|---|---|---|
| Insulation resistance | Initial value | 9.0×1012Ω |
| Moisture resistance test based on JIS C5016-9-4,followed by insulation resistance value measurement. | 1.3×1013Ω | |
| Surface resistanse | JIS C6481-5-10 | 1.0×1013Ω |
| Volume resistivity | JIS C6481-5-9 | 1.0×1014Ω・cm |
| Voltage resistance |
500V×1Min energization (Measured film thickness 20μm) |
OK |
| Relative permittivity | JIS C6481（1MHz） | 4.9 |
| Dielectric tangent | JIS C6481（1MHz） | 0.08 |
*The results above show reference values, not standard values.
