- FR-2
__NOTOC__FR-2 is an abbreviation for Flame Resistant 2. It is a NEMA designation for synthetic resin bonded paper, a
composite material made ofpaper impregnated with a plasticizedphenol formaldehyde resin , used in the manufacture ofprinted circuit board s. Its main properties are similar to NEMA grade XXXP (MIL-P-3115) material, and can be substituted for the latter in many applications.Applications
FR-2 sheet with copper foil lamination on one or both sides is widely used to build low-end consumer electronic equipment. While its electrical and mechanical properties are inferior to those of epoxy-bonded fiberglass,
FR-4 , it is significantly cheaper. It is not suitable for devices installed in vehicles, as continuous vibration can make cracks propagate, causing hairline fractures in copper circuit traces. Without copper foil lamination, FR-2 is sometimes used for simple structural shapes and electrical insulation.Properties
Fabrication
FR-2 can be machined by drilling, sawing, milling and hot punching. Cold punching and shearing are not recommended, as they leave a ragged edge and tend to cause cracking. Tools made of high-speed steel can be used, although
tungsten carbide tooling is preferred for high volume production.Adequate ventilation or respiration protection are mandatory during high-speed machining, as it gives off toxic vapors.
Trade names and synonyms
* Lamitex
* Paxoline
* Pertinax - [http://www.dielektra.com/ Dielektra] brand (now defunct and taken over by [http://www.lamitec.de/ Lamitec] )
* Synthetic Resin Bonded Paper (SRBP)See also
*
Formica (plastic)
Wikimedia Foundation. 2010.