cem 3 material pcb for stable circuits

{"cid":"91221117","title":"Pcb Thickness 0.2-3.2mm Industrial PCB Assembly Featuring Impedance Control and CEM-3 Material for Stable Circuit Design","imgUrl":"https:\/\/img.chinax.com\/nimg\/2a\/0c\/b8c5cf21076fadf81a7211b663c0-200x200-1.jpg","attrs":{"Brand Name":"Suntek Electronics Co., Ltd","Model Number":"2024-PCBA-9657","Certification":"ISO9001 ISO13485 IATF16949 UL","Place of Origin":"China or Cambodia","Usage":"OEM Electronics","Soldermaskcolor":"Green, Red, Blue, Black, White, Yellow","Max Pcb Size":"600*1200mm","Base Material":"FR4","Customized":"Yes","Min Ball Space":"0.3mm\u2264Pitch\uff1c0.5mm","Material":"FR4, CEM-1, CEM-3","Max Thickness":"T\uff1e4.5mm"}}

{"cid":"91225479","title":"Green Solder Mask HDI Printed Circuit Board 1.6MM Pack N Place File Format","imgUrl":"https:\/\/img.chinax.com\/nimg\/51\/65\/69bd1554f92a8fbab6c77f2b0858-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"Support OEM \/ ODM","Model Number":"HDI PCB","Minimum Order Quantity":"1-10 pcs","Delivery Time":"5-15 Working days","Payment Terms":"T\/T,Western Union,Paypal","Place Of Origin":"HDI PCB","Stack Up":"2-6-2","Packaging Details":"Vacuum Package+Carton Box","Certification":"ISO9001, TS16949, UL, RoHS","Electronics Source":"Yes","Layers":"1~64 layers","Impedance Control":"50\u03a9, 75\u03a9, 100\u03a9","Place of Origin":"China","Base Material":"FR-4,CEM-1,CEM-3,Polyimild,PTFE\/Rogers","Surface Treatment":"Immersion Gold","Product Type":"Power Products Pcb Board","Supply Ability":"Double Sided: 12000 sq m \/ month Multilayers: 8000sq.m \/ month","Cu Thk":"35UM","Min Hole":"Mechanical Hole 0.2mm\uff0cLaser Hole 0.1mm"}}