Corrothane XT

Product reference: 3/26

Product title: Corrothane XT

Valid from: 6th February 2008

Last reviewed: May 2019


A three-pack cold cured vinyl ester – urethane polymer alloy with glassflake.

Suggested use

For coating both steel and concrete surfaces, where good
chemicaland high temperatureresistanceare required, either
for immersed or non-immersed service.


This product is very moisture sensitive and may foam if mixed
or applied in moisture condensing conditions, or at relative
humidities above 75%. Tins are nitrogen filled, do not open
before use. It is recommended that wherepossible
de-humidification equipment is used during the application of
this product.

Health & safety

Before handling or using this product, the material safety
data sheet should be read and all precautions observed.
Particular attention is drawn to Hardener B which contains

Surface preparation

Metals: Grit blast to SSPC SP 10 (SIS 05 5900 Sa 2½)
standard and vacuum clean. Refer to Corrocoat Data
Sheet SP1.
For other substrates and further information, refer to
Corrocoat Technical Services

Application equipment

Airless spray pump 45:1 ratio minimum and capacity of at
least 1 gallon (4 litres) per minute. The pump should be
fitted with leather seals and all fluid filters removed. Use a
10mm diameter (3/8”) internal bore spray line with a short
6mm (1/4”) whip end. A large bore contractor type spray
gun fitted with a swivel connector and 29-40 thou reversible spray tip is recommended. The spray tip size and
fan pattern should be selected to suit the nature of the work.
Product may be applied by brush for small areas or stripe
coating. Trowelling is possible.


Dependent upon end use and application conditions,
Corrothane XT is normally applied in wet films of 40-52 mils
(1000-1300 microns).Where conditions allow it is preferable
to apply the product in a single coat application. Where
multi-coats are required it is essential that overcoating times
are kept as short as is possible.

Mixing ratios

89.62 partsBase
01.09 parts Hardener A (organic peroxide)
09.29 parts HardenerB(Isocyanate)
(all ratios by weight)

Mixing instructions

Product should be at ambient temperature before
mixing. Mix the base with a good mechanical stirrer until it
is uniformly mixed. Add Hardener A(organic peroxide) to the
Base and mix thoroughly. Allow mix to stand for a minimum
period of 10 minutes. Thoroughly stir the Base/peroxide mix
again and leave to stand for a further minimum period of 10
minutes (NB.TheBase/peroxide blend is relatively stable and
will not react significantly until Hardener B is added). Add
HardenerB(Isocyanate) and mix thoroughly before applying.

Cure time

Full cure is 4 days at 68°F (20°C). For optimum results a
post cure of 4 hours minimum at circa 176°F (80˚C) is
recommended. However, post cure is not necessary for
many environments.

Spark testing

This product is subject to dielectric fatigue and repeated
testing should be avoided, refer to data sheet 7/30

Pot life

Generally, 50-70 minutes at 68°F (20°C). Pot life will vary
substantiallywith temperature. Referto Corrocoat technical
services for instructions regarding application in hot climatic


The performance of Corrothane XT will be adversely
affected by the addition of solvent thinners and their use is


10 Liter Kits. Due to the hydroscopic nature of this product
the use of part tins is not recommended, suitable kit sizes
should be purchased to meet usage requirements.

Storage life

6 Months stored and away from heat sources and direct
sunlight and below 75°F (24°C). Frequent temperature
cycling will shorten storage life and affect pot life.
Beyond 6 months this product becomes increasingly
susceptible to moisture uptake and foaming and out of
shelf-life material must not be used. (All components
must be used within their designated shelf life). *Please
note that smaller pack sizes have often shown
susceptibility for shorter practical shelf life.

Color availability

Off white or unpigmented (translucent brown) only.Other
colors are not available and it should be noted that the
addition of dyes will adversely affect performance and in
particular chemical resistance.

Recommended DFT

Between 16 mils (400 microns) and 3mm dependent
upon environment,seeapplicationrecommendations

Theoretical spreading rate

54 sf per gal at 30 mils (1.33m²/litre at 750 microns).

Volume solids

This material contains volatile liquid convertible to solids.
Volume solids obtained will vary dependent upon
polymerization conditions. Nominally 99% of the contents are
convertible to solid.

Practical spreading rate

44 sf per gal at 30 mils (1.1 m²/litre at 750 microns).
NOTE: This information is given in good faith but
consumption 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.

Flash point

88°F (31°C).

Temperature limits

300°F (150ºC) Immersed. No known
lower limit. 500°F (260ºC) NonImmersed
NOTE:Thesetemperatures aremaximums and are variable
dependent upon environment.


It is recommended that overcoating takes place as soon as
possible and within 12 hours. Although longer overcoating
times may be acceptable this will depend upon climatic
conditions and ultra violet light levels that affect speed of cure.

Cleaning fluid

Methyl Ethyl Ketone, Methyl Iso Butyl Ketone – before