In a message dated 7/6/98 4:38:32 PM Pacific Daylight Time, [log in to unmask] writes: > Technetters, > > I'm working on a project that involves radiant heating of a circuit board. > I need to know the emmitance value for a standard FR-4 board with solder > mask. > > None of my handbooks gives this value, and several internet searches turned > up nothing. Can anyone help? > Hi Mark! Will thermal conductivity help you? Here's some typical figures: Copper: 400 watt/minute per degree Kelvin Ceramic: 18 watt/minute per degree Kelvin Fiberglass (FR4): .4 watt/minute per degree Kelvin Plastic: .2 watt/minute per degree Kelvin -Steve Gregory- ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################