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