Description
Sourcing genuine R-1787 CEM-3 PCB material is increasingly difficult — Panasonic Electric Works’ R-1787 laminate isn’t something most manufacturers keep in regular stock, since it’s a specialty grade rather than a high-volume commodity. CHNPCB fabricates single-sided R-1787 boards on request, using authentic Panasonic material rather than substitute laminates sold under the same “CEM-3” label.
What Is Panasonic R-1787 CEM-3?
R-1787 is a single-sided copper-clad CEM-3 laminate manufactured by Panasonic Electric Works. Like other CEM-3 grades, it uses a woven glass fabric surface bonded to a non-woven glass core, epoxy resin impregnated — but R-1787 is specifically formulated for applications where heat needs to move efficiently off the board.
Key material specifications:
- Thermal conductivity: 1.1 W/(m·K)
- CTI (Comparative Tracking Index): ≥600
- Copper cladding: Single-sided
The CTI ≥600 rating matters more than it might look at first glance — it’s a high tracking-resistance rating, meaning the material holds up well against surface leakage current under damp or contaminated conditions. Combined with the thermal conductivity figure, that makes R-1787 a genuinely purpose-built choice for power-carrying circuits, not just a cost-driven substitute for FR-4.
The Substrate Side (Image 2)
This shows the R-1787 base material side — no copper, just the raw laminate. The off-white, matte, non-glossy composite surface is characteristic of CEM-3 generally, but the resin formulation on R-1787 specifically is what delivers its thermal performance.
The Component Side (Image 1)
The circuit face shows copper traces, solder mask, and silkscreen (this sample marked HR-50W-06LB, a 50W LED driver layout) — a practical example of the trace density R-1787 supports for single-sided power and LED driver circuits.
Where R-1787 Is Used
Panasonic specifies R-1787 for:
- LED lighting and LED-related equipment
- Power supply applications
- Appliances
The thermal conductivity of the resin board itself helps pull heat away from the copper layer, while still keeping the processability and design flexibility that resin-based (non-metal-core) offer boards over aluminum substrate — easier to punch, drill, and route than a metal-core alternative, while still providing meaningful thermal support for the circuit.
Why Source R-1787 From CHNPCB
As a PCB company from China, we’ve found that most manufacturers who advertise “CEM-3” boards are actually using generic or unbranded laminate rather than Panasonic-sourced material — which matters when a design was specified around R-1787’s actual thermal and CTI performance. CHNPCB fabricates with genuine Panasonic R-1787 laminate, so the board you receive matches the datasheet your design was built against.
(Internal link suggestions: link “R-1786” mention to the R-1786 double-sided product page; link “CEM-3” first mention to the general CEM-3 PCB manufacturer page; link “CTI” to a material properties/glossary article if one exists.)
Guangzhou Mineng Electronics Co., Ltd. (CHNPCB) has been manufacturing PCBs since 2015, based in Baiyun District, Guangzhou. CHNPCB stocks and fabricates genuine Panasonic R-1787 CEM-3 material for export clients across Southeast Asia, Europe, and Australia who need thermally-rated CEM-3 boards that most manufacturers no longer carry. Contact us at PCB@CHNPCB.COM for R-1787 CEM-3 PCB quotes.
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