A Series , B Series , C Series , D Series , E Series , F Series , G Series , H Series , I Series , K Series , L Series , M Series , N Series , O Series , P Series , Q Series , R Series , S Series , T Series , U Series , V Series , W Series , X Series , Y Series , Z Series

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Reference Standard, Primary
A substance that has been shown by an extensive set of analytical tests, to be authentic material of high purity. This standard may be obtained from a recognized source or may be prepared by independent synthesis or by further purification of existing production material.

Reference Standard, Secondary A substance of established quality and purity, as shown by comparison to a primary reference standard, used as a reference standard for routine laboratory analysis