CuSil

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| OtherNames = UNS P07720

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| CASNo = 12665-05-3

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| Formula = Ag (71-73%) Cu (27-29%)

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| Appearance = Silvery metal

| Density = 10.0 g/cm³

| MeltingPtC = 780

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| ThermalConductivity = 371 W/m.K

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CuSil is a tradename for an alloy of 72% silver and 28% copper (± 1%) marketed by Morgan Advanced Materials. It is a eutectic alloy primarily used for vacuum brazing.{{cite journal|last1=Nafi|first1=A.|last2=Cheikh|first2=M.|last3=Mercier|first3=O.|title=Identification of mechanical properties of CuSil-steel brazed structures joints: a numerical approach|journal=Journal of Adhesion Science and Technology|date=21 June 2013|volume=27|issue=24|pages=2705–2713|doi=10.1080/01694243.2013.805640|s2cid=137246500|url=https://hal.archives-ouvertes.fr/hal-01687309/file/identification-of-mechanical-properties.pdf}} CuSil should not be confused with the similarly named Cusil-ABA, which has a different composition (Ag – 63.0%, Cu – 35.25%, Ti – 1.75%)