PHOTOIMAGE MASK

NPR-60/5ER (YS-18)

 

SCOPE:

PHOTOIMAGE MASK NPR-60/5ER (YS-18) is a newly developed liquid type photo-imageable solder resist inks; 1-part system for domestic and 2-part system for overseas purposes. NPR-60/5ER (YS-18) is designed to be applied for hot- air-levelling applications and has features of :

1.    Long pot/shelf-life: 2 weeks of pot-life after mixing, and 4 months of shelf-life after manufacturing.

2.    Wide operation window: The pre-dry conditions is available at the temperature from  70to 90, time from 70 min. to 25 min..

                    ex. 70--- within 70 min. totally

                         75--- within 60 min. totally

                         80--- within 45 min. totally

3. Long holding time/stable characteristics

  : 5ER/YS-18 is able to be hold for 2 days after pre-dry or/and exposure

   without changing it’s developing conditions.

4. Superior photosensitivity/developability

  : Only 400-600 mJ/cm2 is required for forming 3-4 mil solder-dam. Little of

   under-cut, within 10% totally.

5. Excellent heat/electrical resistance is always available.

 

SPECIFICATIONS-1:

ITEM

TYPICAL VALUE

REFERENCE DATA

COLOR ; STATE

5ER: GREEN-COLORED PASTE

YS-18: YELLOW-COLORED PASTE

BY VISUAL

SOLID CONTENT

75WT%

DRIED AT 130 X 1 HR.

SPECIFIC GRAVITY (25)

1.30

SPECIFIC-GRAVITY CUP

VISCOSITY (25)

220 ± 20 PS

VISCOTESTER VT-04

THIXOTROPIC INDEX

(25)

2.5 – 4.5

BROOKFIELD-HBT (η1 /η100)

MIXING RATIO

100g : 10g

ER-ADDITIVE APPLIED

SHELF LIFE

4 MONTHS FROM MAFG. DATE

STORE AT 25 OR UNDER

POT LIFE

2 WEEKS AFTER MIXING

STORE AT 25 OR UNDER

SPECIFIED THINNER

SOLVENT #8500

THINNER FOR NPR-60 SERIES

 

SPECIFICATIONS-2:

ITEM

TYPICAL VALUE

REFERENCE DATA

SURFACE HARDNESS

8H

JIS D 0202

ADHESIVE STRENGTH

100/100

JIS D 0202

SOLDER/HEAT RESISTANCE

260x 15 SEC. X 3 CYCLE

ROSIN-BASED

FLUX APPLIED

HOT-AIR

 LEVELLING RESISTANCE

260x 5 SEC. X 3 CYCLE

MEC-121 FLUX APPLIED

INSULATION RESISTANCE

2.0 x 1012Ω

JIS Z 3197 (PATTERN-II)

ACID RESISTANCE

     10vol% H2SO4

     10vo% HCL

NORMAL

NORMAL

ROOM TEMPT.; 30 MIN. DIPPER

ROOM TEMPT.; 30 MIN. DIPPER

ALKALINE RESISTANCE (5% NaOH)

NORMAL

ROOM TEMPT.; 30 MIN. DIPPER

SOLVENT RESISTANCE

         METHYLANE

         CHLORIDE

NORMAL

ROOM TEMPT.; 30 MIN. DIPPER

 

DIRECTION TO USE:

1.    Mix the principal material with hardener (ER-additive) in the ratio of 100g : 10g for 10-15 minutes, then hold for 15-30 minutes before use. About 2 weeks of pot-life is obtainable after mixing.

2.    Use specified thinner SOLVENT #8500 for dilution purpose, if the viscosity of ink increased by low temperature. Be sure to make the addition ratio of thinner within 3wt%. 1wt% addition of thinner, will cause 20-30 ps of viscosity drop.

3.    A 120-150 meshes polyester-based screen is recommended for printing application.  The printable area of NPR-60/5ER (YS-18) is around 7-9m2 per kilogram (both sides totally). A 15-20μm thickness of coated-film on circuit is recommended after post-cure process (in dried condition).

 4. For your reference, pre-dry conditions is recommended as belows:

   a. PRE-DRY PERFORMED IN 1 TIME BOTH SIDES:

     70 x 35 – 60 min.

     75 x 30 – 50 min.

     80 x 25 – 40 min.

   b. PRE-DRY PERFORMED IN 2 TIMES, FRONT SIDE AND REAR  SIDE RESPECTIVELY:

     Front side                        Rear Side

     70 x 25 min.                    70 x 35 min.

     75 x 20 min.                    75 x 30 min.

     80 x 15 min.                    80 x 25 min.

    Maxium operation window for NPR-60/5ER (YS-18) is 70-70min., 75       -60 min. and 80-45 min.. Be sure to keep your working conditions within the said window. Coated-film after pre-dry process is developable within 2 days, without change it’s developing conditions.

5.       400-600mJ/cm2 of UV energy, measured on coated-film; and a metal halide lamp is recommended for exposure purpose. Increase 10-20% of UV energy when a high pressure mercury lamp is applied.

 6. Developing conditions is recommended as follows:

   Solution: Na2CO3 aqueous solution

   Solution Tempt. : 28-32

Spray pressure: 1.5-2.5 kg/cm2

Developing time: 60-90 sec.

Rinsing: pure water; 60-90 sec.

7.       Perform the post-cure in the conditions of 150-160 x 45-60 min. is recommended.

8.       Perform the legend ink’s printing/curing processes after the said post-cure process is recommended. Solvents contained in legend ink will penetrate into coated-film and causing peeling problem, if the said film is not being cured enough.

9.       Use ester-group solvents or/and hydrocarbon-chlorinated-group solvents to clean/rinse screen, squeege or related tools.

 

REMARKS:

1.    OPERATION CIRCUMSTANCES

--- A clean room with yellow lamp, room temperature: 22-26, humidity: 50-60%, is recommended.  A local exhaust is required.

2.    STORAGE

--- Store the said material in a certain well-ventilated area, at the temperature of 5-25. Avoid direct sun light or/and flame.

3.    HANDLING

--- A local exhaust is required to be set up at operating area. Wear chemical

gloves/goggles, approved respirator or/and suitable protective clothing when in operation. Avoid direct contact with skin or/and eyes. Flush with soap and clean water after use.