... LED lightening products. 3. Thermal Conductive ---material with above 2.0 (W/m·K), up to ... multi-layer board, high density board, including MLB with blind/buried via holesMain base material:FR-1, ... 4, CEM-1, CEM-3, High Frequency Laminate with various dielectric constant (imported or from local supplier), ... 18um – 175um)Min. hole size: 0.2mm/8milMin. line width: 0.1mm/4milMin. spacing: 0.1mm/4milMaximum ...