ISO 4490
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ISO 4490:2008 Metallic powders — Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
Abstract
ISO 4490:2008 specifies a method for determining the flow rate of metallic powders, including powders for hardmetals, by means of a calibrated funnel (Hall flowmeter).
The method is applicable only to powders which flow freely through the specified test orifice.
Please see more at AS-300 Hall Flow Meter