ISO 5842:2022

Overview

ISO 5842:2022 specifies laboratory methods and quality controls for argon detection in powder metallurgy components consolidated by hot isostatic pressing (PM HIP). The standard defines two permitted analytical techniques - gas chromatography (GC) and mass spectrometry (MS) - and sets requirements for equipment, calibration, functionality testing, sampling, sample preparation and test procedures. Components produced by additive manufacturing are explicitly excluded. The document also reminds purchasers to specify in the purchase order whether argon detection is required and to state the agreed argon limit.

Key topics and technical requirements

• Analytical methods: Detection using gas chromatography (GC) and mass spectrometry (MS) to identify trapped argon in PM HIP parts.
• Sample fusion: Test portions are fused in a graphite crucible under helium at about 2 200 °C to release entrapped gases.
• Carrier gas: Helium of purity ≥ 99.9999 % by volume is required for both GC and MS methods.
• Mass spectrometry detection: Argon detection is based on the mass/charge ratio 40.
• Equipment detection limit: Instruments shall detect argon at a level no greater than 0.02 μg/g (equivalent to 0.02 mg/kg or ~20 ppb by mass) in prepared test samples.
• Calibration and functionality tests: Procedures and triggers for calibration are specified (e.g., after installation, after replacement of critical parts, or when functionality deviates). Functionality tests and reference samples are used to verify performance.
• Sampling and preparation: The standard specifies methods for sampling PM HIP components, preparing test specimens and running the prescribed test procedures for both GC and MS workflows.
• Reporting: Requirements for test reporting are included so results are traceable and consistent.

Practical applications and users

ISO 5842:2022 is aimed at organizations and professionals who need to assess and control entrapped gases in PM HIP components, including:

• PM HIP service providers and quality control laboratories conducting gas analysis.
• Materials and metallurgical engineers concerned with component performance and integrity.
• Purchasers and procurement/specification authors who must require argon detection and set acceptance limits.
• Sectors where PM HIP parts are critical (e.g., aerospace, automotive, medical implants) seeking to control internal gas-related defects and ensure component reliability.

Using ISO 5842:2022 helps organizations implement standardized, reproducible methods for argon detection, enabling consistent quality assurance and clearer contractual requirements between PM HIP suppliers and purchasers.

Related standards

ISO 5842:2022 was prepared by ISO/TC 119 (Powder metallurgy) and references general terminology and calibration principles used across ISO standards. Users should consider complementary standards on powder metallurgy sampling/testing and analytical instrument calibration when building a full test program.