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Environmental Sulfur Resistant Chip Resistors Slide 3

The Flower of Sulfur or FOS test is the standard industrial test that examines the porosity of the passivation materials over metal using sulfur vapor and attempts to induce a reaction with silver and other metals. Some automotive electronics companies require this test for component qualification. The example provided above requires 20 days of exposure to sulfur vapor without the formation of silver sulfide.

PTM Published on: 2010-04-28