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IPC Lead Free Material Specification Sheets

	4101/99	4101/101	4101/121	4101/124	4101/126	4101/129
Resin System
Primary	Epoxy	Difunctional Epoxy	Difunctional Epoxy	Epoxy	Epoxy	Epoxy
Secondary 1	Multifunctional Epoxy	Multifunctional Epoxy	Multifunctional Epoxy	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%)	Modified Epoxy or Non-epoxy (max 5%)	Modified Epoxy or Non-epoxy (max 5%)	Modified Epoxy or Non-epoxy (max 5%)
Curing Agent	Not Specified	Not Specified	Not Specified	Not Specified	Not Specified	Not Specified
Fillers	Contains inorganic fillers	Contains inorganic fillers	N/A	N/A	Contains Inorganic Fillers	N/A

Tg	150 min	110 min	110 min	150 min	170 min	170 min
Td	325	310 min	310 min	325 min	340 min	340 min
Z-Axis CTE
Alpha 1	60 max	60 max	60 max	60 max	60 max	60 max
Alpha 2	300 max	300 max	300 max	300 max	300 max	300 max
50-260 C	3.5	4.0	4.0	3.5	3.0	3.0
T260 (min)	30 min	30 min	30 min	30 min	30 min	30 min
T288 (min)	10 min	5 min	5 min	10 min	15	15
T300 (min)	ABBUS	ABBUS	ABBUS	ABBUS	2	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)".

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