2. the laboratory grade (grade laboratory reagent grade, abbreviated LR).The chemicals in the phlitraprong grade purity and maximum quantity of contaminants. This high purity grade substance enough to be used as a general reaction but not suitable to be used as a primary standard.3. grade analysis (analytical grade reagent grade abbreviation AR)Chemicals in this high purity grades than in laboratory-grade, and there may be more expensive than domestic chemical prices, Thailand (not depending on production costs but alone. Sometimes additives grade and grade LR AR the same price). AR grade substances suitable for use as the primary substance and reacting substances.
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