Beryllium copper and copper share some similarities, however, are two completely different materials. Copper is known for being a soft metal, whereas beryllium copper is known for its strength. Out of any copper-based alloy, BeCu (beryllium copper) is rated with the highest strength; which makes it a popular choice when it comes to making springs. Copper is 100% conductive, whereas BeCu ranges from 15-30% conductivity. BeCu is great for hardness and strength, unlike copper which is mainly used for appearance.