PCB Prototyping Unit Conversion Chart |
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Data based on Kepro's chemical supplies, DRY FILM PROCESS |
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Developer DFD-12G |
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Sodium Carbonate |
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Water |
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Sq Ft of Board Developed |
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250 |
mL |
2.3 |
grams |
250 |
mL |
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0.7 |
sq ft |
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500 |
mL |
4.6 |
grams |
500 |
mL |
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1.3 |
sq ft |
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1000 |
mL |
9.2 |
grams |
1000 |
mL |
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2.7 |
sq ft |
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1500 |
mL |
13.7 |
grams |
1500 |
mL |
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4.0 |
sq ft |
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2000 |
mL |
18.3 |
grams |
2000 |
mL |
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5.4 |
sq ft |
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3000 |
mL |
27.5 |
grams |
3000 |
mL |
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8.1 |
sq ft |
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3875 |
mL |
35.5 |
grams |
3875 |
mL |
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10.4 |
sq ft |
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Mix at Temperature 32-38 deg C (90-100 deg F) |
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Develop at temperature 38-43 deg C (100-110 deg F) |
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Etchant SP-1G w CAT1G |
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Sodium Persulfate |
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Water |
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Catalyst |
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Catalyst Maintenance |
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Copper Capability |
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every (1-2hours etch) |
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Sq Ft (1oz) |
Sq Ft (2oz) |
Sq Ft (4oz) |
250 |
mL |
58.5 |
grams |
213 |
mL |
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1.9 |
mL |
0.13 |
mL |
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500 |
mL |
117 |
grams |
426 |
mL |
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3.81 |
mL |
0.26 |
mL |
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1000 |
mL |
234 |
grams |
852 |
mL |
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7.61 |
mL |
0.52 |
mL |
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1500 |
mL |
351 |
grams |
1277 |
mL |
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11.4 |
mL |
0.77 |
mL |
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2000 |
mL |
468 |
grams |
1703 |
mL |
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15.2 |
mL |
1.03 |
mL |
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3000 |
mL |
702 |
grams |
2555 |
mL |
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22.8 |
mL |
1.55 |
mL |
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3875 |
mL |
907 |
grams |
3300 |
mL |
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29.5 |
mL |
2.00 |
mL |
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Bath Temperature 38-43 deg C (100-110 deg F) |
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Note: Copper Capacity is per sq ft of copper single sided |
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Copper Capacity 4-5oz/gallon |
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Note( If you expect to run more than just a few boards, the SP12G or SP20G is |
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much more economical due to the Hazmat fees. The etchant has very long shelf life |
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until mixed, then it is only 3 weeks. |
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Premix the etchant 24 hours prior to use to allow the PH to stabilize. You can |
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accelerate PH stabilization by shocking the solution by adding some spent |
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Sodium Persulfate solution see www.kepro.com for details |
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Exposure Times |
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BTX-200A |
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30-45 seconds |
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PE-2 Photoflood |
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4-6 minutes at 10-12 inches |
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BX-101 or GE FT15-BL single |
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2-3 minutes at 10-12 inches |
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BX-101 or GE FT15-BL double |
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1-2 minutes at 10-12 inches |
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I have a BTX-200A, so I can't validate the other numbers and they are from Kepro |
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Be sure to let the exposed pcb sit for 15 minutes after exposure to allow the phototesist to harden properly |
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Develop time is 45-60 seconds up to 90 seconds |
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Etching time depends on a lot of issues, see www.kepro.com for details |
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Dispose of used solution safely, follow your venues recommendations, do not put in household drain |
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Precipitation and Evaporation are 2 methods. |
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If you want a more environmentally sound procedure, see Think and Tinkers greencircuit.com |
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Copyright Ron Amundson KB0PAX 2002 |
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