Risho Kogyo Co., Ltd. is one of the leading PWB material manufacturer in Japan. 

Their high performance materials has unique feature such as TG300, or high thermal cunductivity. 

7303 series

High thermal conductive & Low elastic PWB material

AD-7303 as Bonding sheet

AC-7303 as Aluminum-base CCL

-Features-

Thermal Conductivity: 3W/mK

Insulation layer has flexibility after heat curing

(Young's modules (RT) is leass one - tenth than FR-4)

7303 series has excellent long term reliability

-Applications-

Metal PCB requiring to suppress solder crack

Metal PCB requiring flexibility (Automotive engine room)