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.