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MAY 2024 I PCB007 MAGAZINE 77 RCCs are also suitable especially the new ZETA RCC with its C-Stage polyimide-cured resin. Figure 3 highlights the newer thin glass cloths of 1015, 1027, and 1037 used in HDI laser-drillable prepregs. Design Guidelines It is best to follow a fabricator's guidelines when designing a bend-to-install FR-4 board. Sample instructions from Unimicron and WUS are shown in Figure 4. e bend portion Figure 3: Thin FR-4 materials for semi-flex: a) Flexible FR-4; b) Thin glass prepreg; c) RCC and polyimide RCC; d) Spread-weave thin-glass prepreg.