7590 Hempadur Fibre 4760 brochure_REN2.indd - Net

HEMPADUR FIBRE 4760
Flexibility where it counts

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Ballast tank challenge • Technology • Performance
Universal primer concept • Cost-effective where it counts
Contents

Fibre-based advantage
for ballast tanks
The new dimension in
Adding fibres to different materials to
boost both strength and flexibility is now a
surface
common practice in modern industry. Fibre-
based materials are eminently suitable for
uses that range from bulletproof vests and
sports equipment to Formula 1 racing cars and spacecraft.
However, Hempel is the first manufacturer to apply and optimise
this technology to protective epoxy coatings. The new HEMPADUR
FIBRE 4760 contains specially selected synthetic fibres that
provide clear improvements in the overall performance of
this unique coating, a fact clearly demonstrated in Hempel
performance tests.
The use of fibres in HEMPADUR FIBRE 4760 increases the
tensile strength and flexibility compared with conventional epoxy
coatings. It also cuts down on the risk of cracks occurring in
ballast tank coatings, and therefore minimises any subsequent
corrosion of the steel.
HEMPADUR FIBRE 4760 represents a new level of ballast tank
coating technology from Hempel.
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Example of the development of cracks and subsequent corrosion in a
conventional epoxy coating applied with an excessive dry film thickness.
The ballast tank challenge
Ballast tanks account for a significant part of the total surface
area of a ship on which protective coatings are required. Yet
ballast tanks are among the most complicated areas to coat
because of their sheer size and design, and because access
is often difficult.
The design and location of ballast tanks also make them difficult
to inspect while the vessel is in service, as well as making
maintenance and repair both difficult and expensive. It is therefore
important to ensure that only a minimum of maintenance is ever
required by applying coatings that are extremely durable.
The combination of vibration in the hull structure, alternate
wet and dry cycles and the ship’s movement in the water
often causes or enhances cracks in the conventional types of
coatings used for ballast tanks.
Another common source of stress on the ballast tank coating is
the thermal variations caused by loading and unloading ballast
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water or cargo, with temperatures often very different from
that of the tank structure. The parts of the tank most severely
affected are normally along edges and in corners, where the
coating is often applied in a thicker – sometimes excessive
– layer, which greatly increases the risk of cracking.
HEMPADUR FIBRE 4760 is designed to drastically reduce the
likelihood of such cracking, due to the greater flexibility and
tensile strength of this special coating.
Vibration in the hull and the ship’s
movement in the water often
cause cracks in conventional
ballast tank coatings.

The technology
The performance
HEMPADUR FIBRE 4760 has been extensively tested, as
shown on the right. Flexibility tests (Mandrel), the thermal
cycling resistance test (NACE TM 0304) and impact tests all
show significant performance improvements compared with
conventional epoxy coatings.
All three test methods highlight the flexibility and crack
resistance of HEMPADUR FIBRE 4760. In all three cases, the
product has been tested against conventional epoxy coatings
commonly used in ballast tanks. HEMPADUR FIBRE 4760 clearly
outperforms the three other products in these tests.
HEMPADUR FIBRE 4760 has also been quality tested by
independent laboratories and has already been awarded
B1 certification from Norske Veritas, as well as NORSOK
prequalification from the National Institute of Technology in
Norway.
Hempel has developed a breakthrough in protective
epoxy coatings – by adding synthetic mineral fibres to
an optimised epoxy formulation. The new HEMPADUR
FIBRE 4760, specially designed for coating the inner
surfaces of ballast tanks, features added benefits in
epoxy technology, with no adverse effects.
When developing HEMPADUR FIBRE 4760, Hempel selected a specific type
of fibre, optimised for use in this particular type of coating. Synthetic mineral
fibres are more flexible than epoxy binders, which means that the ballast
tank coating itself is also more flexible and thus less likely to crack.
A strong network of fibres is distributed randomly throughout the coating,
reinforcing its entire structure. The scan shown above illustrates this
distribution of the fibres in HEMPADUR FIBRE 4760.
HEMPADUR FIBRE 4760 is available in an aluminium pigmented
shade. This is recommended as a primer coat in order to
optimise corrosion protection in submerged conditions.
Strain (%)
Number of cracks
Kg x cm (highest value without cracks)
2.5
2.0
1.5
1.0
0.5
0
700
600
500
400
300
200
100
100
80
60
40
20
0
HEMPADUR
FIBRE 4760
HEMPADUR
FIBRE 4760
Standard
epoxy coating
HEMPADUR
FIBRE 4760
Mandrel
Product 1 Product 2 Product 3
HEMPADUR FIBRE 4760
Product 1
Product 2
Product 3
Impact
Product 1 Product 2 Product 3
The difference between
a standard epoxy
coating and HEMPADUR
FIBRE 4760 applied
with an excessive
dry film thickness in
the corner of a steel
profile, as shown in the
NACE thermal cycling
resistance test. Cracks
only develop in the
standard coating.
NACE thermal cycling resistance test
0
0 256 279 302 362 447 528 600
Cycles 207 266 290 335 387 483 564
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HEMPADUR FIBRE 4760 in aluminium version applied in ballast tanks during
newbuilding.
Universal primer concept
HEMPADUR FIBRE 4760 is more than just an excellent ballast
tank coating. This specialist product is also recommended for
most other surfaces on the vessel, including the hull, decks,
superstructure and cargo holds. This makes it possible to limit
the number of different products used while the vessel is under
construction, and to simplify shipyard work procedures.
Specifications for marine and offshore protection
These specifications apply to all ship types, including crude oil tankers, LNG,
container ships and bulk carriers, as well as FPSO and FSO vessels and
installations, drill ships, semi-submersible rigs and other offshore installations.
Marine environment
Standard specification for ballast tanks (suggested min. 300 micron DFT),
cargo holds, oil tanks, void spaces and coffer dams
HEMPADUR FIBRE 4760 100–200 micron / 4–7 mil DFT
HEMPADUR FIBRE 4760 100–200 micron / 4–7 mil DFT
Marine environment
Standard specification for topsides, decks, masts, cranes and superstructures
HEMPATHANE TOPCOAT 55210 40–60 micron / 1.6–2.4 mil DFT
HEMPADUR FIBRE 4760 100–175 micron / 4–7 mil DFT
HEMPADUR FIBRE 4760 100–175 micron / 4–7 mil DFT
Marine environment
Standard specification for flat bottom, vertical bottom and boottop
Hempel antifouling Contact Hemp el for DFT specifications
HEMPADUR 45182 50–75 micron / 2–3 mil DFT
HEMPADUR FIBRE 4760 100–175 micron / 4–7 mil DFT
HEMPADUR FIBRE 4760 100–175 micron / 4–7 mil DFT
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In addition to its performance properties, HEMPADUR FIBRE
4760 features significant application benefits. It is easy to
apply by brush, spray and roller, and will cure down to -10°C
(+14°F). These properties are very similar to conventional
epoxy coatings. Typical specifications for both marine and
offshore use are listed below.

Cost-effective
where it counts
Maintenance work inside a vessel’s ballast tanks is time-
consuming, manpower-intensive and costly, and can result in long
periods of downtime. This rapidly eats into operating margins.
It is therefore important to enable shipowners and operators to
keep such ballast tank maintenance to a minimum.
One of the most effective ways to do this is to include a low-
maintenance ballast tank coating in the initial specifications,
while the vessel is being built.
To minimise all in-service maintenance, it is also important that
any coating system applied to ballast tank surfaces is as durable
as possible.
The fibre-based HEMPADUR FIBRE 4760 epoxy coating provides
owners and operators with the crucial reassurance that there will
be no premature cracking or other breakdown of the protective
coating inside the ballast tanks. A coating of this quality extends
the service life of the vessel significantly, as well as ensuring
lower life cycle costs and better profit margins.
The new fibre-based HEMPADUR FIBRE 4760 ballast tank coating
from Hempel provides a hidden advantage that makes a visible
difference to operating economics.
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The Hempel Group’s Head Office
Hempel A/S
Lundtoftevej 150
DK-2800 Kgs. Lyngby
Denmark
Phone: +45 45 93 38 00
E-mail: marine@dk.hempel.com
www.hempel.com
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02/2006