Many automotive grade chip film resistors have the anti sulfur feature. Bourns has a white paper, "Advantages of Sulfur-Resistant Film Resistors". It describes in good detail the construction. In short, sulfur based gasses (such as caused pollution) can react with Ag/AgPd resistor terminal that leads to crack the package. A Palladium (Pd) protection layer is added to the Ag terminal to eliminate the formation of Silver Sulphide and hence increases the reliability.
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