... reference: DescriptionDetails SpecificationBase MaterialFR-4,Aluminium-backed board,Halogen-free,Lead-free compatible,High Tg,High ... clearance0.045mm0.03mmImpedance tolerance±10%±8%Finished board thickness0.25mm-3.5mm0.20mm-4.0mmOutline ... typeHigh precision multi-layer board,Blind hole board, Buyerd hole board,High frequency board,Aluminium backed boardCertificateISO9001.UL etcWelcome ...