Yu Yo Space

TU2 oxygen-free copper (ASTM C10200/10100) is the preferred choice for firing enamel because it minimizes oxygen and impurities like phosphorus, preventing bubbles, cracks, and adhesion failures during high-temperature enamelling.​ Why Avoid Standard T1/T2 (ASTM C11000) Copper Standard T1/T2 electrolytic copper—equivalent to ASTM B152 C11000 (Electrolytic Tough Pitch, ETP) at 99.90% minimum purity—contains trace oxygen (up to 0.04%), phosphorus (typically ≤0.00 …