Jack,

I think if you restrict yourself to just one slash sheet type this is too narrow 
unless you have some other specific performance requirements beyond moving 
just to the additional robustness required for lead-free processing instead of 
SnPb soldering.

Have used both the Shengyi (also the lower spec S1170) and Iteq materials 
you have mentioned successfully in the past for lead-free/RoHS-compliant 
professional grade products. Ventec VT-48 is another good laminate of that 
type and we also used Kingboard KB6167. The more familiar brand of Isola 
provided 370HR or FR408 or IS410 all of which gave few problems.

Hope this of some help - good luck!

Regards

Nigel Burtt

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