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See Chinese contents: GB/T 1479.1-2011 GB/T 1479.1-2011: Metallic powders -- Determination of apparent density -- Part 1: Funnel method
This part of GB/T 1479 specifies the method for measuring the apparent density of metal powders with a funnel under standard conditions. This part applies to metal powders that can flow freely through a funnel with a pore diameter of 2.5 mm. If the powder is difficult to pass through a pore with a diameter of 2.5 mm but can flow freely through a 5.0 mm pore, this method can also be used.
