ISO 4490-2018 PDF

Full title and description

Metallic powders — Determination of flow rate by means of a calibrated funnel (Hall flowmeter). This International Standard specifies a laboratory test method using a calibrated Hall funnel to determine the flow rate (flow time) of freely flowing metallic powders, including powders for hard metals.

Abstract

ISO 4490:2018 defines the Hall flowmeter (calibrated funnel) test for metallic powders. The method measures the time required for a defined mass of powder to pass through a standardized orifice; results are reported as time per 50 g (s/50 g). The method applies only to powders that flow freely through the specified test orifice and includes requirements for apparatus, calibration and test procedure.

General information

• Status: Published.
• Publication date: April 2018 (published 4 April 2018 / 2018-04).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 77.160 — Powder metallurgy.
• Edition / version: Edition 5 (2018).
• Number of pages: 7 pages.

(General information based on the ISO bibliographic entry and national adoptions/publications.)

Scope

ISO 4490:2018 applies to metallic powders that flow freely through the standard Hall funnel orifice; it covers the test apparatus (calibrated funnel), sampling and sample preparation, test execution, calculation and expression of results, and basic precision information. It is not applicable to powders that do not flow freely, powders with high lubricant/organic additive content (for which other funnel methods may be more appropriate), or to non‑metallic powders.

Key topics and requirements

• Principle: measure elapsed time for a specified mass (commonly 50 g ± tolerance) to flow through the calibrated Hall funnel; report as seconds per 50 g.
• Apparatus: standardized Hall funnel (dimensions, orifice, funnel angle), non‑magnetic corrosion‑resistant construction, stopwatch or timing device, calibrated mass balance.
• Sampling and sample preparation: representative sampling, conditioning to specified test environment if required, removal of oversized agglomerates where noted.
• Calibration and verification: calibration procedure for the funnel and checks to ensure reproducible orifice geometry and flow characteristics.
• Limitations and interpretation: applicable only to free‑flowing metallic powders; results are comparative and used for quality control, specification and process control rather than as absolute functional performance predictors.

Typical use and users

Commonly used by powder producers, incoming inspection laboratories, powder metallurgy and hard‑metal manufacturers, R&D laboratories, additive‑manufacturing material suppliers, and quality control teams to characterize powder flowability for handling, feeding and die‑filling processes. The test is primarily a QC and comparative tool to specify and verify batch-to-batch consistency.

Related standards

Standards commonly referenced alongside ISO 4490 include other powder characterization and sampling methods such as ISO 3923-1 (apparent density — Scott/Scott volumeter / funnel methods), ISO 13517 (Gustavsson flowmeter — alternative funnel for lubricated powders), ISO 4497 (particle size by dry sieving) and related national/ASTM methods (for example ASTM B213/B212 series covering Hall funnel and apparent density methods). These provide complementary tests for density, particle size and flowability where ISO 4490 is not applicable.

Keywords

Hall flowmeter, Hall funnel, flow rate, flowability, metallic powders, powder metallurgy, test method, calibrated funnel, apparent density (related), ISO/TC 119/SC 2.

FAQ

Q: What is this standard?

A: ISO 4490:2018 is an International Standard that specifies a laboratory test (Hall flowmeter or calibrated funnel) to determine the flow rate/time of freely flowing metallic powders.

Q: What does it cover?

A: It covers the test principle, required apparatus and funnel calibration, sampling and sample preparation, test procedure, calculation and reporting of results, and notes on applicability and limitations (only for powders that flow freely through the specified orifice).

Q: Who typically uses it?

A: Powder producers, incoming inspection and QC labs, powder metallurgy and hard‑metal manufacturers, additive manufacturing material suppliers, R&D groups and independent testing laboratories use it to assess and specify powder flowability.

Q: Is it current or superseded?

A: ISO 4490:2018 is the published (current) edition from April 2018; earlier editions (for example 2014 and prior) were withdrawn and replaced by the 2018 edition. The ISO bibliographic record shows the 2018 edition as published; a new work item (ISO/AWI 4490) has been registered to prepare a future revision. Users should check for any newer revisions or confirmations with their national standards body before quoting the standard for regulatory or contractual purposes.

Q: Is it part of a series?

A: Yes — it belongs to a family of ISO test methods and sampling standards for metallic powders developed under ISO/TC 119/SC 2; related standards cover apparent density, particle size, sampling and other flow measurement methods (e.g., ISO 3923‑1, ISO 13517, ISO 4497).

Q: What are the key keywords?

A: Hall flowmeter, Hall funnel, flow rate, flowability, metallic powders, powder metallurgy, calibrated funnel, s/50 g, ISO 4490.