Hi, I authored the presentation so I may be able to help you out with your Q's.
1. IPC is in draft stage for 4 new material specs. These are in the presentation. I would focus on IPC 4101/ 121 and /124. Match your current Tg requirement to the Tg ranges in one of these two specs and that will be your new lead free material spec.
2. The real difference is the Td of these materials. 170Tg FR4 has a Td of about 300. The new 180Tg lead free materials have Td values of 340 or higher.
3. Tg is glass transition temperature, or the point at which the material starts to gel. Td is the glass decomposition temperature, or the point at which is begins to degrade from a weight-loss perspective.
5. Pricing is most affected on 2, 4, and 6 layer boards for the base material upcharge. There are midgrade materials available to help mitigate this if you spec in /121 material.
Please feel free to email me at ysutariya@saturnelectronics.com if you have any additional questions. Thanks!
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