IPC-4101

Specification for Base Materials (Laminates)

IPC-4101 covers requirements for wide range of base materials, referred to as laminate or prepreg, to be used primarily for rigid or multilayer printed boards.

Recommended Drawing Call-Outs

  • Specifying a slash sheet from this specification is the best way to designate the right material to be used
  • Refrain from specifying laminate or prepreg by brand name, Tg, or Td

Common Lead-Free Capable Materials


 Resin   4101/99, /124 4101/101, /121 4101/126, /129
Primary   Epoxy Difunctional Epoxy Epoxy
Alt 1   Multifunctional Epoxy Multifunctional Epoxy Multifunctional Epoxy
Alt 2   MOD/non-Epoxy (max 5%) MOD/non-Epoxy (max 5%) MOD/non-Epoxy (max 5%)
Fillers   /99: Inorganic; /124: no    /101: Inorganic; /121: no /126: Inorganic; /129: no
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