ISO 28706-2-2017 PDF

Full title and description

ISO 28706-2:2017 — Vitreous and porcelain enamels — Determination of resistance to chemical corrosion — Part 2: Determination of resistance to chemical corrosion by boiling acids, boiling neutral liquids, alkaline liquids and/or their vapours. This part specifies a laboratory test method for assessing the chemical corrosion resistance of flat enamelled surfaces when exposed to boiling corrosive liquids and their vapours.

Abstract

Specifies a procedure to determine the resistance of flat surfaces of vitreous and porcelain enamels to attack by boiling acids, boiling neutral liquids, alkaline liquids and/or their vapours. The method enables simultaneous assessment of effects from both the liquid and vapour phases of the corrosive medium and defines the general test conditions, specimen preparation and evaluation criteria used for routine quality and comparative testing.

General information

• Status: Published (confirmed on ISO systematic review; currently listed to be revised / replacement by a DIS under development).
• Publication date: 2017-02 (Edition 2, 2017).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 25.220.50 (Enamels).
• Edition / version: Edition 2 (2017).
• Number of pages: 17.

Scope

This part of ISO 28706 specifies a laboratory test method for determining the resistance of flat vitreous and porcelain enamel surfaces to chemical corrosion caused by boiling acids, boiling neutral liquids, alkaline liquids and/or their vapours. It covers specimen preparation, the boiling exposure procedure and the means for evaluating and reporting the effects of the corrosive media on the enamel surface (both liquid and vapour phases). The method is intended for comparative and quality-control testing of enamelled surfaces.

Key topics and requirements

• Test media: boiling acids, boiling neutral liquids and alkaline liquids; testing may include vapour exposure as well as liquid contact.
• Specimen type and preparation: flat enamelled specimens representative of production surfaces; cleaning and conditioning before test.
• Apparatus and conditions: controlled boiling/exposure apparatus and defined reflux/containment to maintain boiling conditions and vapour contact.
• Exposure time and temperature: defined boiling conditions (media-dependent) and prescribed exposure durations for comparative evaluation.
• Assessment criteria: visual inspection for changes (blistering, discoloration, etching), possible mass or thickness change measurements and documented reporting of observations.
• Reporting: required test details (media, concentrations, temperatures, exposure time), specimen identification and clear results including pass/fail or comparative ratings.
• Safety and handling: guidance to follow appropriate precautions for corrosive boiling liquids and vapours (laboratory safety, ventilation, PPE).

Typical use and users

Used by enamel manufacturers, coating formulators, quality-control laboratories, independent testing houses and R&D teams to assess chemical durability of vitreous and porcelain enamel surfaces. Typical applications include enameled cookware, sanitaryware, appliances and process equipment where resistance to aggressive liquids and vapours is required.

Related standards

ISO 28706 is a multi-part series covering chemical corrosion testing of enamels. Relevant parts include ISO 28706-1 (acid tests at room temperature — ISO 28706-1:2008), ISO 28706-3 (alkaline liquids using hexagonal vessel — revised in the series), and ISO 28706-4 (alkaline liquids using a cylindrical vessel — ISO 28706-4:2016). These parts define complementary test methods for different media, temperatures and apparatus arrangements.

Keywords

Vitreous enamel; porcelain enamel; chemical corrosion; boiling acid; boiling neutral liquid; alkaline liquids; corrosion resistance test; vapour exposure; enamel testing; ISO 28706.

FAQ

Q: What is this standard?

A: ISO 28706-2:2017 is an international standard that specifies a laboratory test method to determine the resistance of flat vitreous and porcelain enamel surfaces to chemical corrosion by boiling acidic, neutral or alkaline liquids and their vapours.

Q: What does it cover?

A: It covers specimen preparation, the boiling exposure procedure (liquid and vapour phases), assessment criteria (visual and measurable changes) and reporting requirements to provide repeatable, comparative results for enamel chemical resistance.

Q: Who typically uses it?

A: Enamel and porcelain manufacturers, coating formulators, quality-control and certification laboratories, product developers and any organization needing standardized evaluation of enamel resistance to corrosive boiling media.

Q: Is it current or superseded?

A: ISO 28706-2:2017 is a published and currently valid edition (Edition 2, 2017). The ISO record shows it was reviewed and confirmed in 2022 and that a draft revision (ISO/DIS 28706-2) has been under development with the intention to replace the 2017 edition; users should check national bodies or ISO for the latest status before relying on the standard for certification or regulatory compliance.

Q: Is it part of a series?

A: Yes — ISO 28706 is a multi-part series addressing different chemical corrosion test methods for vitreous and porcelain enamels (for example Parts 1, 2, 3 and 4), each covering particular media, temperatures or apparatus configurations.

Q: What are the key keywords?

A: Chemical corrosion, enamel testing, boiling acids, boiling alkalis, vapour exposure, vitreous enamel, porcelain enamel, corrosion resistance, ISO 28706.