
Kipande cha risasi
USA: ASTM B29, risasi iliyosafishwa, usafi 99.90%‑99.99% EU: EN 12659, daraja L10, L20, L30, usafi 99.85%‑99.99% UK: BS EN 12659, L10 takriban usafi 99.99% Ujerumani: DIN EN 12659, daraja L10, L20, L30 India: IS 27‑2023, usafi 99.90%, 99.95%, 99.99% Korea Kusini: KS D 2301, usafi 99.90%, 99.95%, 99.
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