A technician has a cylinder holding a mix of R-22 and R-404A. How should it be labeled before shipment to a reclaimer?

Shipping · EPA 608 Core. The correct answer, and the reasoning behind it.

Labels and DOT classification for refrigerant cylinders.

The question

With no refrigerant name, only the DOT tag
As R-22, since R-22 was put in first
As R-404A, since it is the larger amount
As mixed refrigerant, naming what it containsCorrect answer

Why “As mixed refrigerant, naming what it contains” is correct

Labels must correctly identify what is in the cylinder. A mixture must be identified as such so the reclaimer can handle it properly; mixed refrigerant may not be reclaimable and may have to be destroyed.

Source: EPA: Test Topics

Why the other answers are wrong

With no refrigerant name, only the DOT tag — Refrigerant identification is required in addition to the DOT tag.
As R-22, since R-22 was put in first — Labeling a mixture as one refrigerant is inaccurate and can contaminate other product.
As R-404A, since it is the larger amount — Labeling by the larger amount still misstates the contents.

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