To guarantee anti sulfur characteristics, there are 3 main test methods. At first, so called MFG method, which mix-flows various types of gases at the same time. Secondly, oil test leaving chips in the sulfur melted oils for certain period of time. Lastly, sulfur vapor test, following ASTM-B-809 standard methods. It is commonly using methods, and various methods are derived from this vapor test. Samsung guarantees the chip with dry sulfur vapor test that IBM has adopted.