KOA Speer HV73-RT High Voltage (Anti-Sulfur) Chip Resistors offer a superior maximum working voltage compared to the HV73 Flat Chip Resistors. The HV73-RT feature excellent anti-sulfuration characteristics due to the use of a high sulfuration-proof inner top electrode material. Applying a metal glaze thick film to the resistive film results in excellent heat and environmental resistance. The KOA Speer HV73-RT High Voltage (Anti-Sulfur) Chip Resistors are suitable for flow/reflow soldering and pass ASTM-B809 anti-sulfuration testing.