Heat resistant solder resist ink(For RPC) TAINEX HRS-1-8W White Alkaline development type

Whiteness which beats heat-related problems

HRS-1-8W is a solder resistor ink which features high light reflectivity due to its white color and superb heat resistance.
  •  Feature High heat resistance:Deterioration in reflectance after the heat-resistance treatment can be kept to a minimum
  •  Feature High light reflection:With a film thickness of 45 microns or more, 90% reflectance can be achieved.
  •  Feature Gold plating resistance:The resistor ink remains nearly free from discoloration even if it is heated after gold plate processing.

 Feature High heat resistance

Film thickness:17~20 microns Mesurement : On copper

Product Name Reflection rate
L a b
Initial value 90.4 94.8 -1.8 1.0
150℃×10Hr 75.2 91.6 -2.1 8.3
260℃×10sec 88.0 94.1 -2.0 1.3
200℃×1Hr 69.8 90.8 -2.2 9.9
Product Name Reflection rate
L a b
Initial value 87.0 93.9 -1.8 -0.2
150℃×10Hr 84.8 93.2 -2.5 0.1
260℃×10sec 85.8 93.7 -2.1 0.4
200℃×1Hr 83.1 93.2 -2.8 2.5

After the reliability test at 150°C for 10 hours wherein mounting of COB is assumed, 8W retains a reflectance of 84.8%, while the conventional product remains at 75.2%.

Feature High light reflection

--- Light reflectivity is measured for each film thickness.---

With a film thickness of 45 microns or more, 90% reflectance can be achieved.

Film thickness Reflection rate
L a b
5~10μm 77.0 88.4 -1.2 -2.5
15~20μm 87.0 93.9 -1.8 -0.2
25~30μm 89.2 95.9 -2.0 1.9
35~40μm 89.9 96.5 -2.0 2.5
45~50μm 90.7 97.1 -1.9 3.0

Feature Gold plating resistance

--- A substrate was prepared and coated with HRS-1-8W on one side and a general resistor ink was coated on the other side, and gold plating was applied on both sides. Thereafter, they were heated at 200℃ for one hour, and the discoloration degrees of the resistor inks were compared. ---

The side with the general resistor ink changed to a pink color as the heat was applied and the reflectance deteriorated. On the other hand, 8W did not change in color and showed no deterioration in reflectance. This means 8W is capable of retaining high reflectance.

■Coating film performance

Item Test method HRS-1-8W
Hardness JIS K5600-5-4 5H
Adhesion JIS K5600-5-6 Category 0
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 C6481 260 deg.C for 20 Sec. OK
Gold plating resistance Electroless nickel gold plating process
Hear resistance 150℃×1000Hr OK
PCT 121 deg. C for 9 Hr OK
Combustibleness UL standard 94V-0 eq.
Radiation factor Heat dissipation rate measurement
(Measurement range: 3-30 microns)
Total amount of chlorine Calculated from material used (calculated value) Less than 100ppm
Amount of sulfur Calculated from material used (calculated value) None contain

■Electric characteristics

Item Test method HRS-1-8W
Insulation resistance Initial value 3.8 × 1012
24V load, 60 deg. C, RH90%, 1000Hr 1.0×1012
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 20 microns)
Relative permittivity JIS C6481(1MHz) Evaluating
Dielectric tangent JIS C6481(1MHz) Evaluating

*The results above show reference values, not standard values.