ISO 4496:2017 PDF

Overview

ISO 4496:2017 specifies laboratory methods to determine the acid‑insoluble content (AIC) in metallic powders - specifically iron, copper, tin and bronze powders. The procedure estimates non‑metallic, acid‑insoluble material such as silica and silicates, carbides, alumina, clays and other refractory oxides that may be present in raw materials or introduced during powder manufacture.

Key topics and requirements

• Scope: Applicable to non‑lubricated powders of iron, copper, tin, bronze and simple Cu–Sn mixtures.
• Sample size & replicates: Typical test portion ≈ 5 g; perform two determinations per sample.
• Reagents: Use analytical‑grade reagents and distilled (or equivalent) water. Methods use combinations of hydrochloric acid, nitric acid, hydrogen peroxide, and specific reagents for detection (e.g., potassium thiocyanate, diethyldithiocarbamate sodium, sodium sulfide/H2S).
• Equipment: Standard lab glassware plus a precision balance (±0.0001 g), ashless filter paper (