Notice
Federal Gazette
Published on Tuesday, 24 October 2023
Published by BAnz AT 24.10.2023 B5
Federal Ministry of Justice
Page 1 of 4
www.bundesanzeiger.de
Federal Environment Agency
Department II 3.4
Heinrich-Heine-Str. 12
08645 Bad Elster
www.umweltbundesamt.de
Second amendment
to the notice of the assessment basis
for enamels and ceramic materials in contact with drinking water1, 2
Dated 17 October 2023
1 Notified in accordance with Directive (EU) 2015/1535 of the European Parliament and of the Council of 9 September 2015 laying down a procedure for
the provision of information in the field of technical regulations and of rules on Information Society services (OJ L 241, 17.9.2015, p. 1).
2 Notified under 2023/0225/D
The announcement of the assessment basis for enamels and ceramic materials in contact with drinking water of 5
August 2019 (BAnz AT 12.9.2019 B8), as amended by the amendment of the assessment basis for enamels and
ceramic materials in contact with drinking water of 6 August 2021 (BAnz AT 25.8.2021 B15), is amended:
I.
Amendments
1. The previous spelling of the German term ‘Trinkwasser-Installation’ (drinking water installation) is replaced by the
spelling ‘Trinkwasserinstallation’ throughout the entire document.
2. The German term ‘Versuchswasser’ (test water) is replaced by the term ‘Prüfwasser’ throughout the entire document.
3. Point 1 is amended as follows:
Materials that are used for the construction or maintenance of plants for the production, treatment or distribution of
drinking water and come into contact with drinking water may not, in accordance with § 14 of the Drinking Water
Ordinance (TrinkwV):
1. reduce, directly or indirectly, the intended protection of human health;
2. impair the colour, smell or taste of the water;
3. promote the propagation of microorganisms; or
4. release substances into the water in larger quantities than is unavoidable if they comply with the generally
accepted rules of technology.
The present assessment basis pursuant to § 15(1) TrinkwV specifies in greater detail the aforementioned general
hygiene requirements for the materials listed in the scope of application.
Materials falling under the scope of this assessment basis comply with § 14 TrinkwV if they meet the requirements
listed here. Pursuant to § 15(2) TrinkwV, the assessment basis is binding two years after being notified in the Federal
Gazette (i.e. since 12 September 2021). Since that date, operators of water supply systems in accordance with §
13(2) TrinkwV have had to ensure that only enamels, other glass-like materials, ceramic materials and mixed metal
oxide coatings that meet the requirements of this assessment basis are used for the construction and maintenance
of water supply systems. Proof that a product meets the requirements of this assessment basis can be provided, for
example, by a certificate from a certifier accredited for the drinking water sector.
Under the revised Drinking Water Directive (Directive (EU) 2020/2184), requirements that are uniform across Europe
for materials in contact with drinking water will be imposed in the future. These rules will replace the present
assessment basis.
4. Point 2 is amended as follows:
The assessment basis applies to all enamels, other glass-like materials, ceramic materials and mixed metal oxide
coatings in contact with drinking water.
5. In point 3, the first sentence is amended as follows:
Enamels, other glass-like materials, ceramic materials and mixed metal oxide coatings may only contain the
ingredients listed in this assessment basis.
The PDF file of the official publication is provided with a qualified electronic signature. See note on the information page.

Notice
Federal Gazette
Published on Tuesday, 24 October 2023
Published by BAnz AT 24.10.2023 B5
Federal Ministry of Justice
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www.bundesanzeiger.de
6. In point 3, the third sentence is amended as follows:
The requirements for the element release are designed in such a way that the corresponding limit values of the
Drinking Water Ordinance or − if these do not exist − the relevant guideline values of the Federal Environment
Agency (UBA) or the World Health Organisation (WHO) are not fully exhausted by the release from enamels, other
glass-like materials, ceramic materials or mixed metal oxide coatings (see point 7.3 in this respect).
7. Point 6.1 is amended as follows:
6.1 Enamels including other glass-like materials
6.1.1 Positive list for enamels and other glass-like materials
Enamels and other glass-like materials in contact with drinking water may only contain ingredients listed in Table 1.
Table 1: Positive list of possible ingredients of enamels and other glass-like materials
Content in % Content in % Content in %
Substan Minimu Maximu Substan Minimu Maximu Substan Minimu Maximu
ce m m ce m m ce m m
SiO2 25 100 K2O 0 10 P2O5 0 5.0
Na2O 0 30 Li2O 0 10 SnO2 0 5.0
ZrO2 0 30 ZnO 0 10 SrO 0 5.0
B2O3 0 20 Al2O3 0 5.0 Cr2O3 0 3.0
TiO2 0 16 CoO 0 5.0 CuO 0 3.0
BaO 0 15 Fe2O3 0 5.0 NiO 0 3.0
CeO2 0 15 MgO 0 5.0 Sb2O3 0 1.0
CaO 0 10 MnO2 0 5.0
F 0 10 MoO3 0 5.0
6.1.2 Enamel
Enamel is a glass-like material formed by melting at 1 200 – 1 300 °C and quenching (fritting) with inorganic
composition, mainly oxidic composition (see Table 1).
The ground enamel frit is applied to ferrous metals by melting at more than 480 °C. The resulting enamelling
combines the strength and elasticity of metals with the hardness and chemical resistance of glass. When
enamelling, enamel and metal react with each other in an electrochemical reaction, and a composite material is
created. As a result, enamel adheres to the metal surface with up to 100 N/mm². The enamelling cannot be
infiltrated, is diffusion-tight and is temperature-resistant up to 300 °C.
Enamels used for drinking water should have a high resistance to water.
Enamelled components that meet the requirements of this assessment basis demonstrate hygienic suitability for use
with all drinking water.
6.1.3 Glass
Glass is an inorganic, non-metallic, mostly oxidic material, which is obtained by completely melting a mixture of raw
materials (for example quartz sand) at high temperatures. The homogeneous liquid obtained during melting is cooled
down to a solid state (usually without crystallisation). Unlike enamels, this material is not applied to a metallic
material. Glass is a material mainly made of purified sand (SiO2). As additives, alkali metal salts (Na2O and K2O) are
added to reduce the high melting point of SiO2 (approx. 1 700 °C). The addition of Al2O3 reduces brittleness. Glasses
used for drinking water should have a high resistance to water. Glass components according to Table 1 which meet
the requirements of this assessment basis demonstrate hygienic suitability for use with all drinking water.
6.1.3.1 Borosilicate glass
For borosilicate glass, the following positive list (see Table 2) applies as a derogation3, which is associated with a
lower testing effort.

Notice
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Published on Tuesday, 24 October 2023
Published by BAnz AT 24.10.2023 B5
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The boron that gives the glass its name is added in the form of B2O3.
Table 2: Positive list of possible ingredients of borosilicate glass
Content in % Content in %
Substan Minimu Maximu Substan Minimu Maxim
ce m m ce m um
SiO2 80 100 K2O 0 4.2
B2O3 7.0 13 Na2O 0 4.2
Al2O3 0 2.4
3 By extending the scope of the positive list for enamels (see Table 1), also for other glass-like materials, borosilicate glasses correspond to both
positive lists. The positive list for borosilicate glasses (see Table 2) is still valid because certificates have already been issued in this respect.
However, this positive list will be obsolete in the European regulations in the future.
8. In point 6.2, the fourth sentence is amended as follows:
The sintering temperatures are between 1 050 °C and 2 500 °C, depending on the material.
9. The following additions are made in Table 5:
Table 5: Positive list of permitted ingredients of hard ferrite ceramics
Content in % Content in %
Substan Minimu Maximu Substan Minimu Maxim
ce m m ce m um
B2O3 0 1.0 Li2O 0 0.1
CoO 0 0.2 TiO2 0 0.1
La2O3 0 0.2
10. In point 6.3, the first sentence is amended as follows:
Titanium external flow anodes for cathodic protection of the inside of storage drinking water heaters made of
enamelled, low-alloy steel or stainless steel and titanium external flow anodes for cathodic protection of filter vessels
in drinking water treatment made of non-alloy steel (outside the drinking water installation with a permanent flow) or
low-alloyed steel with mixed metal oxide coatings of iridium oxide (IrO2) and tantalum oxide (Ta2O5) in a mass ratio
between 50 %: 50 % and 85 %: 15 % (m/m) are covered.
11. In point 7.1, the first sentence is amended as follows:
This assessment basis lays down requirements for the hygienic suitability of products in contact with drinking water
in accordance with the scope of application referred to in point 2.
12. In point 7.2, the second sentence is amended as follows:
Enamels and other glass-like materials may contain only the ingredients listed in Table 1.
13. In point 7.3, the first sentence is amended as follows:
The release of elements from products in contact with drinking water, when properly used, must not lead to the limit
values stipulated in the TrinkwV being exceeded in distributed drinking water.
14. In point 8.1, the first sentence is amended as follows:
Hygienic suitability for use in drinking water must be demonstrated on the component.
15. In point 8.2.1 the heading is replaced:
8.2.1 Enamels/other glass-like materials
16. In point 8.2.1, the third sentence is amended as
follows: The purpose of the review of the
composition is:
1. verifying that enamels or other glass-like materials contain only the ingredients listed in Table 1 (see point 6.1);
and
2. identifying the product.
17. Point 8.2.4 becomes point 8.2.2 and as a result the further numbering changes.
18. In point 8.3.4, the fourth sentence is amended as
follows: Enamels/other glass-like materials
For the testing of enamels or other glass-like materials, a determination of the elements indicated in Table 11 shall
be carried out independently of the composition of the enamel or glass-like material by means of an appropriate
measuring method, for example ICP-MS according to DIN EN ISO 17294-1.

Notice
Federal Gazette
Published on Tuesday, 24 October 2023
Published by BAnz AT 24.10.2023 B5
Federal Ministry of Justice
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19. In Annex 2, lines 7, 12, 17 and 22 in the sixth column are amended as follows:
Contact
Total contact End of the duration
Week Migration cycle time migration in days Analysis
in days period per
2 6 9 Wednesday 1 No
3 11 16 Wednesday 1 No
4 16 23 Wednesday 1 No
5 21 30 Wednesday 1 No
20. A new Annex 3 is inserted:
Annex 3
Exemplary overview of the different products in the respective product group
The following table contains exemplary products or components for the respective product groups (see Table 14).
For the assignment of the components into the product groups, the actual water-touched surface parts of the
individual components must be taken into account. The surface portions of components made of the same materials
must be summed up.
Product group5 Products (examples)
Pipes (P1) Flange pipes (usually < 1 m length)
Equipment (P1) Valves, fittings
Equipment components where the surface Valve housings and lids
portion in contact with water < 10 % in equipment
(P2)
Small-surface equipment components where the Ceramic bearings and ceramic shafts in drinking water
surface portion in contact with water < 1 % in the pumps
equipment (P3)
Containers (P1) Enamelled storage tank drinking water heaters