EN ISO 28721-1:2019

Vitreous and porcelain enamels - Glass-lined apparatus for process plants - Part 1: Quality requirements for apparatus, components, appliances and accessories (ISO 28721-1:2019) EN ISO 28721-1:2019

Publication date:   Apr 21, 2020

General information

60.60 Standard published   Oct 16, 2019


CEN/TC 262 Metallic and other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys

European Norm

25.220.50   Enamels



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This document specifies the quality requirements for apparatus, components, appliances and accessories of glass-lined steel (including semi-crystallized enamel coatings) and glass-lined steel castings used for process plants. It specifies the quality requirements and the tests to be carried out by the manufacturer as well as the actions to be taken to repair defects.
It is also applicable to glass-lined pumps, pump components and fittings.
It does not apply to glass-lined flanged steel pipes or glass-lined flanged steel fittings.
NOTE 1 Provisions for glass-lined flanged steel pipes and glass-lined flanged steel fittings are given in ISO 28721-4.
The test methods specified cover checking the enamel, the dimensional accuracy and the performance of apparatus and components.
This document is applicable to new apparatus and components as well as used items that have been re-enamelled.
It does not contain requirements regarding the chemical or physical properties of vitreous and porcelain enamels.
NOTE 2 Examples of test reports are given in Annex A.

Life cycle


EN ISO 28721-1:2011


EN ISO 28721-1:2019
60.60 Standard published
Oct 16, 2019