TM 1-1500-204-23-6 Table 4-2.  Aluminum Alloy Designation Conversions (Old to New) - CONT Old New Old New Old New alloy alloy alloy alloy alloy alloy EC ⁶EC 18S 2018 B54S 5254 AELS 1030 24S 2024 XC56S X5356 AD1S 1050 25S 2025 C57S, K157 5357 BD1S 1060 A17S 2117 XD50S X5405 AC1S 1070 XB14S X2214 F52S 5652 JC1S 1075 F18S 2618 R306, K162 ¹⁰6003 BC1S 1080 B25S 2225 53S 6053 AB1S 1085 XC16S X2316 61S 6061 FB1S 1090 F28S 2618 62S 6062 AA1S 1095 3S 3003 63S 6063 BA1S 1099 4S 3004 66S 6066 2S 1100 XA5S X3005 A51S 6151 R308 ⁷1130 32S 4032 XB51S X6251 BE1S 1145 45S, K145 4043 B53S 6253 ED1S 1150 45S 4045 XD53S X6453 CD1S, 99 6 1160 C43S, 44S, K143 4353 E53S 6553 99.75 ⁸1175 XE43S X4543 J51S, K160 6951 CC1S, R998 1180 A50S, R305, K155   5005 70S 7070 EB1S, 99.87 1187 50S 5050 72S 7072 CA1S 1197 52S 5052 75S 7075 99.3 ⁹1230 X55S X5055 XA78S X7178 R995 1235 56S 5056 B77S 7277 11S 2011 LK183 5083 R399 8099 14S, R301, Core 2014 K186 5086 K112 8112 17S 2017 A54S 5154 XB80S X8280 1 Cladding on Alclad 24S (Alclad 2024). 2 Cladding on No.  2 Reflector Sheet. 3 EC - The designation for electrical conductor metal is not being changed since it is so firmly established in the electrical industry. 4 Cladding on R301 and Alclad 14S (Alcald 2014). 5 No. 1 Reflector Sheet. 6 EC - The designation for electrical conductor metal is not being changed since it is so firmly established in the electrical industry. 7 No. 1 Reflector Sheet. 8 Cladding on No 2 Reflector Sheet. 9 Cladding on Alclad 2024 (Alclad 24S). 10 Cladding on Alclad 2014 (R301 and Alclad 14S). 4-3