Product reference: 3/47

Product title: Heatblocka

Valid from: 4th July 2007

Last reviewed: May 2019


Two pack cold cured high build insulating coating.

Suggested use

As a durable coating in areas which require both insulation
and corrosion protection

Health & safety

Before handling or using this product, the material safety
data sheet should be read and all precautions observed.

Chemical resistance

Refer to the chemicalresistance list (200 series material).
Affected by some highly polar solvents and some solutions
having a high pH above 122°F (50°C).

Surface preparation

Metals: for best results abrasive blast to SSPC-SP10
(ISO standard 8501-1 Sa 2½) or equivalent. (For full
details refer to Corrocoat Surface Preparation SP1.) For
non-immersed environments Heatblocka may be applied
over a surface which has been well prepared by wire
brushing or needle gunning.
Concrete: Refer to Corrocoat SP5.

Application equipment

Airless pump of 45:1 ratio or greater. Fit leather and PTFE
seal combination and remove all fluid filters. 10mm diameter
(3/8”) nylon lined hose with 6mm whip end, large bore
gun with reverse clean spray tip. Typical tip size is 27 to
31thou with a 45° to 60° fan. Size of tip and fan angle will
vary dependent upon the nature of the work.
Pressure to suit hose lengths and working conditions, (circa
200bar). (Do not use spray pressures above 275 bar). Application by airless spray is recommended for optimum results, Heatblocka may be applied by  brush or trowel.


Dependent on intended use and site conditions, Heatblocka
is normally applied direct to the surface wet on wet at films
between 78-118 mils (2000-3000microns). Single coat
applications are acceptable.Wherelogistics demand,
primer PPAmay be used or PPV for temperatures over
185°F (85°C).

Recommended DFT

Between 80-240 mils (2000-6000 microns) dependent
upon duty and environment. To achieve the
recommended DFT multiple coats may be required.

Mixing ratio / mixing

98:2 base to hardener. For inhibitor use refer to Corrocoat
Technical Services; for mixing instructions refer to Polyglass
Application Data Sheet. Adding inhibitor after the catalyst
will ruin the product.


It is important to observe maximum overcoating times
and note these will vary substantially with climatic
conditions. Minimum, as soon as gel has occurred and
while still tacky. Maximum, at 68°F (20°C) 72 hours. Strong
ultra- violet/sunlightwillsubstantiallyreduceovercoating
time.Take care to avoid contamination before application of
subsequent coats. Ensure there is ventilation during cure.

Curing time

Full cure 3-4 days at 68°F (20°C)

Pot life

Circa 50 minutes at 68°F (20°C) but may be varied
by use of inhibitor or special manufacture for low
application temperatures, refer to Polyglass
Application Data Sheet.


Thinning where required could be achieved by the addition of no more than .25 gal (1 litre) of styrene monomer per 5.25 gal (20 litres) of
Heatblocka. It should be noted that dilution with styrene might affect hold up and chemical resistance. Do not add any other solvents for


1 Gallon and 5 Gallon Kits

Storage life

Base 12 months and catalyst (hardener) 6 months, stored at
temperatures below 75°F (24°C), away from heat sources
and out of direct sunlight. Frequent temperature cycling will
shorten storage life. See ‘other information’ in the Corrocoat
Technical Manual for extension of shelf life.

Color availability

Off White, other colors are available on request but the
addition of dyes adversely affects chemicalresistance and air
inhibition suppressant is required for color stability.

Theoretical spreading rate

14 sf per gal (0.33m²/litre) at 3 mm.

Volume solids

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

Practical spreading rate

10 sf per gal (0.25 m²/litre) at 3mm.
NOTE: This information is given in good faith but rate
may vary significantly dependent upon environmental
conditions, the geometry, nature of work undertaken and
the skill and care of application. Corrocoat accepts no
responsibility for any deviation from this value.


Heatblocka base: .02lbs/cubic inch (0.8 g/cm3). Hardener:
.04lbs/cubic inch (1.07 g/cm3).

Catalyst type

Methyl Ethyl Ketone Peroxide, type P2.

Temperature limits

212°F (100°C) immersed. 482°F (250°C) non-immersed.
No known lower limit. There may be some discolouration
observed above 356°F (180°C).

Cleaning fluid

Methyl Ethyl Ketone, Methyl Iso Butyl Ketone – before gel.