Page 8 - GEORGFISCHER - LISTINO GHISA MALLEABILE 2023 - FIDRA

General Information

Product standards Elements of the standard
designation
The international malleable cast iron pipe fittings
standard ISO 49 and the European malleable cast For vendor independent public tenders, inquiries,
iron pipe fittings standard EN 10242 apply. Both etc. EN 10242 and ISO 49 provide a syntax for
standards are almost equal. The European fittings product designation. To indicate the Design Symbol is
standard (EN 10242) has been adopted by most imperative within this syntax in order to define mate-
European countries as a national version rial and thread type properly.
(DIN EN 10242, ÖNORM EN 10242, SN EN 10242, etc.
etc.), whilst the former national standards have been As an example the designation for an equal elbow
withdrawn (e.g. DIN 2950). The British Standard is an with 2 internal threads, fitting size ½, galvanised,
exception. BS 143 & 1256 has merely been partially Design Symbol A is:
superseded by BS EN 10242. Parts of BS 143 & 1256
remain valid as on the one hand also fittings made Elbow EN 10242 – A1 – ½ – Zn – A
of copper based materials are covered and on the 1 2 3 4 5 6
other hand some types/shapes of malleable cast iron
fittings are included, which are not covered by
BS EN 10242. The standard designation is structured as follows:

In EN 10242 (and ISO 49) the different combinations Designation Explanation
of malleable cast iron grades and types of jointing 1 Type of fitting Kind of fitting shape
threads, offered by the different manufacturers are Product standard EN 10242 (ISO 49)
grouped into so called «Design Symbols». These 2
«Design Symbols» have been introduced to facilitate 3 Symbol see Product Range, „ISO / EN ... “
the specification/designation of the fittings execution 4 Fitting size(s) given in inch (see column “Dim.” of
Product Range)
for tendering or ordering process. They are not inten- 5 Surface Fe = black
ded to be used for marking of the fitting or packaging. Zn = galvanised
6 Design Symbol A, B, C or D see explanation in tab. 1
Georg Fischer malleable cast iron fittings are
exclusively manufactured from decarburised tab. 2 Explanation of standard designation
annealed (white) malleable cast iron type
EN-GJMW-400-5 and with Rp and R jointing
threads. Thus they comply with Design Symbol A.

Design Type of material Tensile strength Elongation Jointing thread
Symbol acc. to EN 1562 in N/mm² in %
EN-GJMW-400-5 400 5
A
EN-GJMB-350-10 350 10 parallel internal thread Rp
and taper external thread R
EN-GJMW-350-4 350 4 acc. to EN 10226-1/ISO 7-1
B
EN-GJMB-300-6 300 6
EN-GJMW-400-5 400 5
C*
EN-GJMB-350-10 350 10 taper internal thread Rc*
and taper external thread R
EN-GJMW-350-4 350 4 acc. to EN 10226-2/ISO 7-1
D*
EN-GJMB-300-6 300 6
* Not used at Continental Europe, respectively partially prohibited by national regulations.
tab. 1 Design Symbols for malleable cast iron fittings

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