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Are there any requirements regarding the color code of heavy naphtha in the National VI standard?

2018-11-16View Original

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Recently, the color code of the raw material is 7.0, while that of the finished product is 2.5; previously it was 1.5. The company’s standard stipulates that this value should not exceed 1.5. I’ve heard that the national standard allows a value of up to 3.5, but I haven’t found any relevant documents. I would like to ask: apart from issues related to the raw materials, are there any operational methods that can be used to reduce the color code? Also, what is the purpose of controlling the color code – is it to ensure stability?

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