Heat resistant solder resist ink(For RPC)
TAINEX HRS-1-7W White
Overwhelming heat-resistance of silicone resin
- Feature High heat resistance：The high heat resistance property is achieved with a silicone resin. Almost no reflectance deterioration was detected under the condition of 150℃ for 1000 hours.
- Feature Superb UV resistance：The HRS-1-7W is resistant to ultraviolet radiation and almost no deterioration has been noted even when exposed to UV-C irradiation.
- Feature Countermeasure against low-molecular siloxane：Even though HRS-1-7W is consisted of silicone resin,there is no detection of low-molecular siloxane, which may cause electrical contact failure.※1
Feature High heat resistance
The reflectance deterioration rate after heating the product at 260℃ for 3 cycles was as low as 2%. There was almost no change compared to the initial condition.
| Film thickness | L | a | b |
Reflection rate （450nm） |
|
|---|---|---|---|---|---|
| HRS-1-7W Initial | 30〜35μm | 94.32 | -1.22 | -0.36 | 91.12 |
| After 260 deg.C ×10 minutes 3 cycles | 94.23 | -1.41 | 0.89 | 89.00 | |
| After 320 deg.C ×2 minutes | 94.37 | -1.35 | 0.54 | 89.80 |
Feature Superb UV resistance
UV-C Irradiation test (HRS-1-7W, General solder resist ink)
With resistor inks that are based on organic resins including epoxy resin, their luster is deteriorated by UV-C. With HRS-1-7W, however, it is free from any deterioration in luster.
| HRS-1-7W | Gloss |
Light reflectance （450nm） |
Voltage resistance |
|---|---|---|---|
| Initial | 48.3 | 90.85 | 500V OK |
| After UV-C irradiation for 1000 hours | 42.0 | 89.09 | 500V OK |
HRS-1-7W is free from any insulation breakdown at 500 V even after it has been exposed to UV-C irradiation for 1000 hours.
Feature Countermeasure against low-molecular siloxane※1
Amount of low molecular siloxane in the ink (D4-D10)
|
Types of cyclic siloxiane |
Concentration ［ppm］ |
|---|---|
| D4 | N.D. |
| D5 | N.D. |
| D6 | N.D. |
| D7 | N.D. |
| D8 | N.D. |
| D9 | N.D. |
| D10 | N.D. |
| Σ Dn（n=4〜10） | N.D. |
HRS-1-7W is a solder resistor ink consisting of a silicone resin which features high light reflectivity due to its white color and superb heat resistance.
Measurement was performed at
Kita-Kanto Analysis Center,
TOSHIBA ENVIRONMENTAL
SOLUTIONS CORPORATION.
Measurement method: measurement tool:
gas chromatograph (GC/FID)
■Coating film performance
| Item | Test method | HRS-1-7W |
2coat type HRS primer +HRS-1-7W |
|---|---|---|---|
| Hardness | JIS K5600-5-4 | 2H or more | 2H or more |
| Adhesion | JIS K5600-5-6 | Category 0 | Category 0 |
| Solvent resistance | Isopropyl alcohol, 5Min immersion | OK | OK |
| Acid resistance | 10% sulfuric ,30 Min immersion at room temp. | OK | OK |
| Alkaline resistance | 5% sodium hydrate, 5 Min immersion | OK | OK |
| Solder resistance | JIS C6481 260 deg.C for 20 sec. | OK | OK |
| PCT | 121 deg. C for 9 Hr | OK | OK |
| Combustibleness | UL standard | 94V-0 | 94V-0 |
■Electric characteristics
| Item | Test method | HRS-1-7W |
2coat type HRS primer +HRS-1-7W |
|---|---|---|---|
| Insulation resistance | Initial value |
1.8×1012 Initial |
2.5×1012 Initial |
|
24V load, 85 deg. C, RH85%, 1000Hr |
1.1×1012 After Test |
1.0×1012 After Test |
|
| Surface resistanse | JIS C6481-5-10 | 1.0×1011Ω | 1.0×1012Ω |
| Volume resistivity | JIS C6481-5-9 | 1.0×1013Ω | 1.0×1013Ω･cm |
| Voltage resistance | 500V | OK | OK |
*The results above show reference values, not standard values.
