Ed:
Don't know what FR-1 is, but FR-2 is a flame retardant form of paper phenolic laminate. The
numbers after the FR appear to be assigned by performance and cost. FR-2 is lower Tg, cost and
performance than FR-4 which is lower cost, performance, and Tg than FR-5.
Hope this was some help.
Don Vischulis
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Ed Cosper wrote:
> What is FR1 and how does it differ from FR4?
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