EN ISO 28706-3:2018 PDF

Overview

EN ISO 28706-3:2018 (ISO 28706-3:2017) specifies a laboratory test method for determining the resistance of vitreous and porcelain enamels to chemical corrosion by alkaline liquids. The method covers testing at temperatures between 25 °C and 95 °C and uses either a hexagonal vessel (six specimens tested simultaneously) or a tetragonal glass bottle (four specimens tested simultaneously). The standard is commonly applied to assess enamel durability against hot detergent solutions and other alkaline media.

Key topics and requirements

• Scope and principle: Quantifies enamel attack by alkaline liquids through mass loss, visual change and other corrosion indicators.
• Apparatus and specimen layout: Uses a hexagonal vessel (6 specimens) or a tetragonal glass bottle (4 specimens) to ensure simultaneous, repeatable exposures.
• Reagents and standard test solution:
  • A defined standard detergent solution is provided to represent typical market detergents in alkalinity, wetting and complexing behavior.
  • Composition parameters include sodium tripolyphosphate (acts as complexing agent), sodium carbonate, sodium perborate, and an alkylsulfonate wetting agent; relative proportions control pH and alkalinity.
• Test conditions:
  • Temperature range: 25 °C – 95 °C.
  • Duration, temperature and specific solution used must be recorded; test variants for other solutions are permitted and documented.
• Results and reporting:
  • Results expressed as loss in mass per unit area (and corrosion rate where applicable), visual assessment and detailed test report including solution, temperature, duration and specimen preparation.

Applications and users

• Quality control and production: Manufacturers of enameled cookware, sanitaryware, appliances, heat exchangers and industrial containers use the standard to validate enamel durability.
• Product development and R&D: Materials scientists and coating developers compare formulations and optimize enamel compositions.
• Independent testing and certification: Test laboratories and conformity assessment bodies apply the method for compliance and comparative performance data.
• Procurement and specifications: Engineers and specifiers reference EN ISO 28706-3:2018 in technical requirements for enameled products exposed to alkaline cleaning agents.

Related standards

• ISO 28706-1: resistance to acids (liquid phase)
• ISO 28706-2: boiling acid tests (vapour/liquid)
• ISO 28706-4: alkaline (e.g., NaOH) test methods
• ISO 28706-5: autoclave/high-temperature aqueous tests

Keywords: EN ISO 28706-3:2018, vitreous and porcelain enamels, chemical corrosion, alkaline liquids, hexagonal vessel, tetragonal glass bottle, detergent solution, corrosion resistance testing.