Tom CEM-1 is composed of paper, glass and epoxy resin. The raw materials for CEM-3 and FR-4 are fiberglass and epoxy resin. The main difference between them is the form of reinforcement. The reinforcement for CEM-3 is a combination of woven glass and non-woven glass web. On the other hand, FR-4 use all woven glass. The overall performance of FR-4 is better than that of CEM-3, which is better than that of CEM-1. The cost is, you may guess, the complete reverse. In terms of processibility, CEM-1 and CEM-3 are punchable. One has to use a drill to process FR-4. Of course, it is a general view so there may be exceptions for special grades. We, Doosan Electro-materials, offer a variety of quality base materials including CEM-1, CEM-3, and FR-4 at competitive price. If you are interested, please call Mr. Kim who is our US office manager at 408-733-3553. Minsu Lee Associate Manager R&D Dept. Doosan Electro-materials. ----- Original Message ----- From: Tom Burek <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, May 26, 1999 7:25 AM Subject: [TN] Compare CEM-1, CEM-3 and FR4 > Can anyone tell me what CEM-3 is? How does this differ from CEM-1 and FR4? Is there a WEB site that list this information in one site? > Thank You, > > Tom Burek > [log in to unmask] > > ################################################################ > 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 > ################################################################ >