Independent mass conversion: one copper layerStarting quantity1 avoirdupois oz / ft² ≈ 305.152 g / m².Assumed copper density8.96 g / cm³ gives about 34.057 µm equivalent.Net area: 2 m²Ideal copper mass ≈ 0.610304 kg; no carrier or scrap.³Ô¹Ïtv · Original engineering illustration · Not an IPC acceptance figure