IPC Lead Free Material Specification Sheets4101/99Resin System Primary Secondary 1 Secondary 2 Epoxy Multifunctional Epoxy Modified Epoxy or Nonepoxy (max 5%) Difunctional Epoxy Multifunctional Epoxy Modified Epoxy or Nonepoxy (max 5%) Not Specified Difunctional Epoxy Multifunctional Epoxy Modified Epoxy or Nonepoxy (max 5%) Not Specified Epoxy Multifunctional Epoxy Modified Epoxy or Nonepoxy (max 5%) Not Specified N/A Epoxy Multifunctional Epoxy Modified Epoxy or Nonepoxy (max 5%) Not Specified Contains Inorganic Fillers Epoxy Multifunctional Epoxy Modified Epoxy or Nonepoxy (max 5%) Not Specified N/A

4101/101

4101/121

4101/124

4101/126

4101/129

Curing Agent Not Specified Fillers

Contains inorganic fillers Contains inorganic fillers N/A

Tg Td Z-Axis CTE Alpha 1 Alpha 2 50-260 C T260 (min) T288 (min) T300 (min)

150 min 325 60 max 300 max 3.5 30 min 10 min ABBUS

110 min 310 min 60 max 300 max 4.0 30 min 5 min ABBUS

110 min 310 min 60 max 300 max 4.0 30 min 5 min ABBUS

150 min 325 min 60 max 300 max 3.5 30 min 10 min ABBUS

170 min 340 min 60 max 300 max 3.0 30 min 15 2

170 min 340 min 60 max 300 max 3.0 30 min 15 2

If previous material was standard FR-4: "Material should meet or exceed requirements of IPC 4101/121". I use 121 instead of 101

because it is open to the use or exclusion of fillers, which are just characteristics of different resin systems. Basically, you want the population of allowable materials to be as large as possible to keep costs down. If previous material was 170Tg FR4: "Material should meet or exceed requirements of IPC 4101/129 (or /124 if you can go down to 150Tg)".