Lead Free Resource Center

Welcome to Saturn Flex Systems' Pb-Free Resource Center.  

Topics range from laminate and final finish considerations to fabrication and assembly guidelines. 

Should you require information on a topic that you don't find here, please contact us and we'll gladly research it for you.

Pre-Bake Suggestions for Pb-Free Final Finishes
Final Finish Temp  Time      Comments
Tin                   125°C 4 hours Higher Temp may reduce solderability
Silver 150°C 4 hours Silver may tarnish, but solderability should not be affected
ENIG 150°C 4 hours No issues with extended bake on ENIG finish
OSP 105°C 4 hours Extended bakes may negatively impact multiple heat cycle assembly

Commonly Called-Out Pb-Free Capable Materials

  4101/99, /124 4101/101, /121 4101/126, /129
Resin System      
Primary Epoxy Difunctional Epoxy Epoxy
Secondary 1 Multifunctional Epoxy Multifunctional Epoxy Multifunctional Epoxy
Secondary 2 Modified Epoxy or Non-epoxy (max 5%) Modified Epoxy or Non-epoxy (max 5%) Modified Epoxy or Non-epoxy (max 5%)
Fillers /99:  Inorganic
/124: None
/101: Inorganic
/121: None
/126: Inorganic
/129: None
Tg 150 C min. 110 C min. 170 C min.
Td 325 C min. 310 C min. 340 C min.
T260 (min) 30 min 30 min 30 min
T288 (min) 5 min 5 min 15 min
T300 (min) ABBUS ABBUS 2 min

Click here to see full version of Isola Lead Free Assembly Guidelines


Latest on Lead-Free Capable Materials
PCB Magazine February 2012
Advancements in lead-free materials are not necessarily restricted to the materials themselves; they often develop in our knowledge base of the characteristics and performance criteria of the already available library of materials in the marketplace. This is truly the low-hanging fruit.
Click here to read rest of article