Used to make electrical connectors that are exposed to air and corrosive conditions, this 99.99% pure gold wire stays highly conductive where other conductors would fail. It also has a high melting point, low thermal resistance, and won’t oxidize, so it’s good for making parts that remain accurate in extreme environments. Compared to platinum, gold is more conductive but has a lower melting point. It’s often used to make O-rings, even for high-vacuum applications, because it’s soft enough to form a good seal when pressed between two flanges, yet won’t damage the flanges so you can reuse them.

99.95% pure, this platinum wire is used for applications that require a soft material that resists corrosion and oxidation and has a high melting point. This wire allows heat and electricity to pass and resists oxide buildup, making it ideal for thermocouple probes, which require accurate readings even at high temperatures. Soft enough to create a good seal between two flanges, it's also used to make high-vacuum O-rings. Platinum's softness means it won't damage the flanges, so they can be used again. The high melting point of this wire makes it a better choice for sealing heated flanges than other materials such as gold.