\0 TO: I1263600 IBMMAIL ipc internet technical query FROM: DSTEWART EX2 D.Stewart - Product Development Manager. DATE: 10 August 1995 SUBJECT: laminate with CTI of 400+ REFERENCE: what to use? We have a customer who has been asked by his designers to provide boards with a CTI of greater than 400 and a flammability rating of 94V-1. They also ask if standard FR4 will comply - at least I know the answer to that one. I am not sure what laminate will meet this requirement - FR3 has been suggested, but laminate suppliers always leave off the CTI when quoting electrical properties. Could someone help identify something to suit? On another issue, I always get confused when people talk about FR3, G10, G200, CEM 1, CEM3 etc. I know what FR4 is - glass fibre reinforced epoxy laminate - but could someone put the other materials into similar English for me? Dougal Stewart Product Development Manager Exacta Circuits Scotland