What is the difference between RO4350 and RO4350B Substrates?Is it that fire retardant properties are added in RO4350B?

 

It does appear that way:

Source: Rogers Corporation
Specifically designed as a drop-in replacement for RO4350™ material, RO4350B laminate is the standard flame retardent product in the RO4000 product line.

Found at: https://www.circuitsolutions.com.au/uploads/ro4350B_4.pdf

 

What about dissipation factor, dielectric constant etc?Will they vary for RO4350 and RO4350B?

 

What about dissipation factor, dielectric constant etc?Will they vary for RO4350 and RO4350B?

Have you checked the relevant datasheets?

 

I could not find seperate datasheets for RO4350 and RO4350B ? In Rogers datasheet they are mentioning only about RO4350B. But both RO4350 and RO4350B are mentioned as two different substrates in many sites .Needed to know the difference between them.