ISO 23028:2019

Overview

ISO 23028:2019 specifies methods for the preparation and storage of test samples of smelter‑grade aluminium oxide (alumina). The standard covers reduction of a bulk sample (1 kg to 20 kg) to representative portions suitable for chemical and physical analysis. It is intended for dry, free‑flowing aluminium oxide and emphasizes minimizing atmospheric exposure to avoid water absorption that can affect analytical results.

Keywords: ISO 23028:2019, aluminium oxide sample preparation, smelter‑grade aluminium oxide, sample storage, test samples.

Key topics and technical requirements

• Scope and principle
  • Procedures ensure the reduced sample is representative of the initial bulk from one source.
  • Mixing and rotary splitting are the primary methods for homogenization and division.
• Apparatus
  • Rotary splitter (large): stainless steel recommended; minimum of eight receivers; receiver capacity up to 2 kg; design to minimize fall distance and fines loss.
  • Small rotary splitter: receivers up to 250 g; minimum eight receivers; may require vibratory feeder.
  • Laboratory top‑pan balance: capacity ~4 kg with 1 g readability.
  • Airtight sample bottles, brush, powder funnel.
• Fines control
  • If determining particles