MoldMAX XL? Alloy
Materion Brush Performance Alloys’ MoldMAX XL Alloy is a high strength copper mold alloy with good thermal conductivity.The alloy contains no beryllium and is available in sections as large as 12” thick. The alloy’s hardness is comparable with AISI P-20tool steel, but its thermal conductivity is two to three times higher. MoldMAX XL Alloy is used as injection mold cores andcavities. The alloy provides excellent toughness, wear resistance and surface finish. MoldMAX XL Alloy typically machines fasterthan tool steels, and with appropriate machine tools, metal removal rates several times higher can be obtained
CHEMICAL COMPOSITION (weight percent)
Alloy Nickel Tin Copper
MoldMAX XL Alloy 8.5-9.5 5.5-6.5 Balance
PHYSICAL PROPERTIES
Elastic 
Modulus Melting 
Point 
(Solidus Density Thermal 
Expansion Thermal 
Conductivity 
(100 °C) Heat 
Capacity 
(100 °C)
17,000 ksi 
120 GPa ~1695 °F 
~925 °C 0.322 lb/in3 
8.90 g/cm3 9.0x10-6 in/in °F 
16.2 x 10-6 °C -1 40 BTU/hr·ft·°F 
70 W/m·°C 0.093 BTU/lb·°F 
0.39 J/g·°C
TYPICAL MECHANICAL PROPERTIES*
0.2% Offset 
Yield Strength 
(nominal) Ultimate 
Tensile 
Strength Fatigue 
Strength 
107 Cycles 
(R=-1) Elongation Impact 
Strength Hardness
105 ksi 
720 MPa 115 ksi 
790 MPa 35 ksi 
240 MPa 6% 15 ft·lb 
20 J 30 HRC
*Properties may vary by shape and thickness.