Purpose White Cushion (Amine-Coated Cushion) is a kind of new type drilling cushion for small hole, and is applicable for 0.15mm or less hole on precise multi-layer circuit board. It is designed for substituting bakelite board for meeting the requirements of IS014000. Technical Parameters: Code Items Unit Standard 1 Standard Thickness mm 2.3~2.7í+0.2 2 Density (Weight) g/cm3 880í+40 3 Water Content % [5 4 Non-Straightness of Edge mm/m í+1.0 5 Flexural Strength Max Turnup /Diagonal [0.5% 6 Elastic Modulus Mpa í¦3200 7 Internal Bonding Strength Mpa ú+1.0 8 200C/24hThickness Expansion after Absorbing Water (Bared) % í_35 9 Static Bending Strength Mpa í¦35 10 Size Stability Thickness Direction % -4.5 or 5 Length Direction % -0 or 1.50 11 Surface Hardness N/mm2 80í+5 12 Formaldehyde Release mg/100g [40