Answer: eutectic

AnswerCrossword Clue
EUTECTICHaving maximum fusibility
eutecticnoting or pertaining to such a mixture or its properties
eutecticeutectic substance
eutecticof greatest fusibility: said of an alloy or mixture whose melting point is lower than that of any other alloy or mixture of the same ingredients
eutectica mixture with a low melting point