Product reference: 3/01

Product title: Di-shield

Valid from: 8th December 2004

Last reviewed: May 2019


Di-shield is a polyester co-polymer mixed with glassflake and other fillers to
give good dielectric properties.
Di-shield will cure at low temperatures, has excellent adhesion and is able to
withstand the high pH generated in the vicinity, of impressed current
anodes. Di-shield will continue to cure under water once applied, it requires
no primer and is of buttery consistency to prevent slumping, while allowing
ease of application at the required thickness.

Suggested use

Specially formulated for resistance to cathodic disbonding,
it is mainly used as a dielectric-shield to dissipate current
and protect areas immediately adjacent to anodes used for
impressed-current distribution.


Where a thickness in excess of 6mm is required, this should
be achieved in multiple coats. Di-Shield must only be
applied to blast cleaned surfaces for good resistance to
cathodic disbondment.

Health & safety

Read and observe Health and Safety precautions before
handling this material. Skin contact should be avoided,
and eye protection should be worn. Wear a suitable fume
mask in confined spaces. Do not use in confined spaces
without ventilation. Do not ingest.

Surface preparation

1. Remove all weld slag and spatter, grind welds reasonably
2. Where necessary remove oil and grease by solvent
detergent washing or steam cleaning.
3. Minimum grit blast standard is SSPC-SP10 (ISO
8501-1 Sa 2½) or equivalent using a suitable
abrasive, to provide a profile of 100um (0.004”).
4. Remove blast residues by vacuum cleaning or blowing
with clean, dry, oil free compressed air or on vertical
surfaces, brushing with a suitable clean brush.
5. Apply Di-Shield as soon as possible after blasting and
before color change or the formation of visible rust bloom.

Application equipment

Trowel or short hair, stiff brush.

Mixing ratio / mixing

100:2 parts by weight, base to catalyst. Mix the whole
contents of one bottle of catalyst provided into one can of
Di-Shield using a heavy-duty power mixer to ensure thorough
mixing is achieved. After mixing, remove contents from tin
and re-mix on a clean flat surface or in a shallow receptacle.

Pot life

Pot life is dependent upon temperature and Di-Shield should
only be mixed immediately before application. Usable life will
be circa 40 minutes at 68°F (20°C) but will vary
significantly, long when cold, short when hot.


Di-Shield is applied at a film thickness of 6 to 8mm from
anode edge tapering over a distance of a half meter to
a meter to a thickness of 1mm. It should preferably be
applied in two coats, but can be applied in a single coat to
the required thickness provided 6mm is not exceeded in a
single coat. Minimum application temperature is 14°F
( -10°C). Surface must be dry and 38°F (3°C) above dew
Extending the shield application area to 5 feet (1.5 meters)
from the edge of the anode will be advantageous in current
dissipation with most systems. In extreme cold conditions
product may have long cure time, base can be heated to
68°F (20°C) before addition of catalyst using indirect heating
to assist in polymerization.


DO NOT THIN. The addition of any thinner or solvent is
detrimental to this product.


1 Gallon and 5 Gallon kits

Storage life

12 months minimum stored at temperatures below 68°F
(20°C) and away from heat sources or direct sunlight.

Color availability

Mid grey

Volume solids

99.1% solvent free.

Practical spreading rate

4.0 kg per square metre at 3mm.
NOTE: This information is given in good faith but may
increase dependent upon environment conditions, the
geometry and nature of work undertaken and the skill and
care of application. Corrocoat accepts no responsibility for
any deviation from these values.

Specific gravity

0.04lbs/cubic inch (1.2 gms/cc) mixed.

Flash point

89°F (32°C).

Catalyst type

Methyl Ethyl Ketone Peroxide, type P2

Mixing ratio

100:2 parts base to catalyst weight/weight basis.

Cure time

May be immersed within 1 hour of application at 68°F (20°C).


May be overcoated as soon as previous coat has stiffened
sufficiently to support the weight of next application.
Overcoating ofDi-Shield should, where necessary, be carried
out within 60 hours.

Cleaning solvent

Acetone, Methyl Ethyl Ketone.

Dielectric properties

Minimum 25 kV at 1mm film.

Cathodic disbonding resistance

Excellent, BS 3900/F11 1.5v. Nil disbonding after 56 days.

Abrasion resistance

Excellent, 428mg loss H18 wheel 1000 gm load,
1000 cycles.

Impact resistance