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Edition 3: 07/18
1. GeneRAl InFORmATIOn pag. 4
2. COPRAX SYSTem PROPeRTIeS pag. 6
3. COPRAX FIBRA SYSTem PROPeRTIeS pag. 8
4. TeCHnICAl InFORmATIOnS pag. 9
5. GuARAnTee pag. 20
6. InSTRuCTIOnS FOR uSe pag. 22
7. CHemICAl ReSISTAnCe pag. 31
8. PReSSuRe lOSS pag. 37
9. THeRmAl InSulATIOn pag. 43
10.TeCHnICAl InSTAllATIOn pag. 44
11. PReCAuTIOnS pag. 53
12.TeSTInG pag. 56
13. FITTInGS DImenSIOn pag. 57
1. GENERAL INFORMATION
COPRAX, produced by Prandelli since 1987, is a sys-
tem made up of Random Copolymer Polypropylene
(hereinafter referred to as PP-R) pipes and fittings.
The system’s characteristics make it suitable of he-
ating and water installations which over time have
become particularly reliable and available in seve-
ral different forms. Its use is also permitted for the
transport of industrial and food fluids depending on
the characteristics of the fluid conveyed. The pe-
culiarity of the COPRAX system is the technique for
its assembly: assembly is made by fusion welding
of the parts to be connected. After the welding,
the pipe and fitting become a single part. This exc-
ludes problems which could result from potential
losses. The assembly technique, the wide range of
fitting measurements available, the versatility of
the system and the excellent chemical and physical
characteristics make COPRAX a product whose high
quality is proven.
The COPRAX system is made from a Random Copo-
lymer Polypropylene (PP-R) approved for the pro-
duction of pipes according to the standards DIN
8078 (Polypropylene Pipes. General Quality Requi-
rements - Tests) and UNI EN ISO 15874.
Before processing, the granule is submitted to spe-
cific tests in our laboratories to verify its suitability
for use (ISO/R 1133 procedure 18. Melt index MFI
PP-R is a thermoplastic resin which is transformed
into the finished product by a rise in temperature,
which plasticizes the material, allowing the pipe to
be produced by means of extrusion, and the fittings
These processes are carried out inside our factory,
under the control of skilled, qualified staff. The
dimensions of the pipes and fittings, with the rela-
tive processing tolerances, are established in accor-
dance with the standard UNI EN ISO 15874 (Pipes in
polypropylene, PP, dimensions) Pipes are produced
in the following Series: S5, S3.2 and S2.5.
Density Fusion index MFR (230°C/2, 16 Kg) Minimum modulus of elasticity Flexure modulus (2 mm/min) Tensile modulus (1 mm/min) Strain elongation (50 mm/min) Deformation Stress warpage (50 mm/min) Impact strength (Charpy) c/notch (23°C) Impact strength (Charpy) c/notch (0°C) Impact strength (Charpy) c/notch (-23°C) Impact strength (Charpy) s/notch (23°C) Impact strength (Charpy) s/notch (0°C) Impact strength (Charpy) s/notch (-23°C) Coef. of linear thermal expansion (0°C/70°C) Thermal conductance Specific heat (20°C) Surface resistivity
ISO 1183 ISO 1133 ISO 178 ISO 178 ISO 527
ISO 527-2 ISO 527-2
ISO 179/1eA ISO 179/1eA ISO 179/1eA ISO 179/1eU ISO 179/1eU ISO 179/1eU DIN 53752 DIN 52612
adiabatic calorimeter IEC 60093
g/10 min MPa MPa MPa
W/mK kJ/kg K
905 0.25 480 800 900 13.5 25 20 3.5 2.0
no break no break
40 1.5 x 10-4
TEST METHOD UNIT OF MEASUREMENT
ReSISTAnCe TO eleCTROCHemICAl
COPRAX is chemically inert and highly resistant to
a wide range of acids and bases. This makes it su-
itable for contact with the materials normally used
in the construction sector, such as lime or cement,
with no need for specific protection.For transport
of/or contact with special substances, please refer
to check the chemical resistance of the polypropy-
lene, consulting the table provided on page 31.
lOW THeRmAl COnDuCTIVITY
The material’s high level of thermal insulation
ensures containment of heat loss on the part of
the fluid conveyed. This means minimal drop in
temperature between the hot water production
and delivery points, with consequent energy saving.
COPRAX (determined according DIN 53482) > 1 -1016 Ω cm Steel = 0.1 ÷ 0.25 - 10-4 Ω cm Pure iron = 0.0978 - 10-4 Ω cm Pipe grade industrial copper = 0.017241 - 10-4 Ω cm
Volume resistivity (at 20° C) of COPRAX and the metals normally used in the heating and water supply sector
COPRAX (determined according DIN 52612) λ = 0.24 W/mK Steel λ = 45 ÷ 60 W/mK Iron λ = 45÷ 60 W/mK Copper λ = 300 ÷ 400 W/mK
Conductivity (at 60° C) of COPRAX and the metals normally used in the heating and water supply sector
The low thermal conductivity value also causes a
drastic reduction in the formation of condensation
on the outside of the pipe, a frequent problem on
metal pipes in some temperature and humidity
Finally, it takes longer for the water to freeze when
the outdoor temperature is particularly low.
COPRAX SYSTEM PROPERTIES2.
Due to the material’s high sound insulation value, the
noise level of the systems is considerably reduced
both with particularly high water flow speeds and
when water hammers are present.
HYGIenIC AnD nOn-TOXIC
PP-R, the raw material used for production of
the COPRAX system, is completely non-toxic and
complies with the current standards at international
ReSISTAnCe TO STRAY eleCTRIC CuRRenTS
Due to its high electrical insulating properties,
COPRAX is unaffected by stray currents, which
may create dangerous punctures in metal pipes.
This phenomenon occurs above all in installations
in zones with a high concentration of industrial
facilities, close to railway lines and in other zones
with a high concentration of electrostatic currents.
lOW lOSS OF PReSSuRe
Due to the particularly homogeneous, compact
structure of the material, achieved by using a state
of the art production technology, the inside surface
of COPRAX pipes and fittings is non- porous and free
from cracks or crazing. This means the surface is
extremely smooth, and loss of pressure is very low
(see graphs on page 38/39).
There is also no risk of pipe blockages caused by
Due to the density of just 0.905 g/cm3, the pipes
and fittings are very light. Combined with the wide
range of fittings available, this enables installations
to be made easily and safely, with considerable time
saving compared to conventional products.
3. COPRAX FIBRASYSTEM PROPERTIES
is produced through coextrusion of two distinct ma-
terial, and the result is the pipe wall is made from 3
different layers as follows:
1. Inner layer, in direct contact with water,
made from PPR
2. Intermediate layer, made from PPR and Fi
ber Glass (GF)
3. Outer layer, made from PPR
The production process allows us to realize all the
three layers in a unique production phase. The th-
ree layers are linked together through the common
PPR raw material.
The main advantage related to the presence of fiber
glass raw material is the impressive reduction of the
linear expansion coefficient of the finished product.
This advantage allows the plumber to reduce the
number of clamps in case of external installation.
We recommend in any case to follow the installation
guideline chapter in the technical guide.
The regular COPRAX fittings are suitable for connec-
tion with COPRAX FIBRA pipe, and the installation
technique is the same used for the normal COPRAX
pipe, because the welding point is only the outer
layer of the COPRAX FIBRA pipe.
• Linear expansion reduced up to 60%
• Higher stability
• Versatility in the external installation works
SOme OF THe FIelDS OF APPlICATIOn
• Hot and cold, potable water installation
• High rise installation
• Industrial installation
• Compressed air transportation
• Air conditioning systems
Checking the resistence of a product is achieved by
taking the following into consideration:
1. The mATeRIAl that it is made of.
2. The DemAnDS placed upon it.