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

  4101/99, /124 4101/101, /121 4101/126, /129
Resin      
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