HT-4H
High Temperature Silicone Acrylic
PRODUCT
DESCRIPTION
A single component, low VOC, air-drying, high-gloss finish coat designed for medium temperature
resistance.
INTENDED USES
This high-performance coating provides outstanding weathering properties and has excellent
atmospheric resistance to most chemicals and both fresh and salt water.
For protection of equipment such as stacks, cat crackers, boilers, heat exchangers, etc. which
operate at temperatures up to 232ºC (450°F). Can be used to coat stainless steel surfaces since it
is chlorine free.
PRACTICAL
Colour
INFORMATION FOR HTGloss Level
4H
White, Aluminium
Gloss
Volume Solids
52%± 2%
Typical Thickness
38-50 microns (1.5-2 mils) dry equivalent to
73-96 microns (2.9-3.8 mils) wet
Theoretical Coverage
11.80 m²/litre at 44 microns d.f.t and stated volume solids
474 sq.ft/US gallon at 1.8 mils d.f.t and stated volume solids
Practical Coverage
Allow appropriate loss factors
Method of Application
Airless Spray, Roller, Air Spray, Brush
Drying Time
Overcoating Interval with
recommended topcoats
Temperature
25°C (77°F)
REGULATORY DATA
Touch Dry
Hard Dry
Minimum
Maximum
*
4 hours
3 hours
Extended
Flash Point (Typical)
18°C (64°F)
Product Weight
1.33 kg/l (11.1 lb/gal)
VOC
3.28 lb/gal (394 g/lt) EPA Method 24
See Product Characteristics section for further details
Protective Coatings
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Issue Date:05/02/2015
Ref:4418
HT-4H
High Temperature Silicone Acrylic
SURFACE
PREPARATION
Surfaces must be dry, clean, free of oil, grease, form release agents, curing compounds, laitance,
other foreign matter and be structurally sound. Remove all loose paint, mortar spatter, mill scale,
and rust.
New Surfaces:
Steel
Blast to near-white metal surface cleanliness in accordance with SSPC-SP10 or ISO8501-1:2007
Sa2½. Blast profile on steel should be 19 to 50 microns (0.75 to 2.0 mils ) in depth and be of a
sharp, jagged, nature as opposed to a “peen” pattern (from shot blasting). Surfaces must be free of
grit dust. HT-4H should be applied to cleaned surfaces as soon as possible to prevent re-rusting or
contamination.
Where necessary, remove weld spatter and where required smooth weld seams and sharp edges.
Steel surfaces may be primed with HT-8 or Cathacoat 302H primers.
Previously Painted Surfaces
HT-4H may not be applied to existing coatings. All coatings must be removed and substrates
treated as for New Surfaces.
APPLICATION
Mixing
This material is a one component coating and should always be mixed
thoroughly with a power agitator before application.
Prior to application, strain mixed material through 60 mesh screen or other
suitable filtration device.
Airless Spray
Recommended
Use a 0.38mm (15 thou) tip size and adjust
pressure as needed.
See Product Characteristics section for further
details
Air Spray
(Conventional)
Recommended
See Product Characteristics section for further
details
Brush
Suitable
Roller
Suitable
Thinner
T-5 Thinner
Cleaner
T-5 Thinner
Work Stoppages
Do not allow material to remain in hoses, gun or spray equipment.
Thoroughly flush all equipment with T-5 Thinner. Partially filled containers
may show surface skinning and/or a viscosity increase of the material after
storage.
Clean Up
Clean all equipment immediately after use with T-5 Thinner. It is good
working practice to periodically clean equipment during the course of the
working day. Frequency of cleaning will depend upon amount sprayed,
temperature and elapsed time, including any delays.
See Product Characteristics section for further
details
All surplus material and empty containers should be disposed of in
accordance with appropriate regional regulations/legislation.
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HT-4H
High Temperature Silicone Acrylic
PRODUCT
CHARACTERISTICS
Advantages:
- Temperature resistance up to 232ºC (450°F)
- Excellent gloss and colour retention
- Smooth, easy to clean finish
- Chlorine free - use to coat stainless steel surfaces
Do not exceed recommended film thickness.
HT-4H is not suitable for immersion.
To minimize pinholing and bubbling when applied over inorganic zincs, use a mist coat/full coat
technique with minimum of one minute elapsed time between cross passed coats. Allow the first
coat to dry at least 4 hours at 25ºC (77°F) before applying the next coat.
Thinning is not normally required or desired; however, at lower temperatures, small amounts (5% or
less by volume) of T-5 Thinner can be added depending on local VOC and air quality regulations.
For airless spray application, use a 100 ft.1/4'' diameter ID airless hose with 8-10 ft. painters whip at
the gun connection.
For air spray application, use a suitable material pressure pot with mechanical agitator and dual
regulators for air and fluid; a professional grade gun with 78E needle and tip combination or
equivalent.50 ft. length fluid hose, minimum 1/4'' ID;50 ft. length air hose, minimum 3/8'' ID should
be used with a air supply minimum of 80 psi, 25 cfm at spray gun nozzle. Use a suitable in-line
moisture trap and oil separators to provide clean, dry air to pressure pot and spray gun.
When application is made by conventional air spray, use the lowest air pressure that will achieve
good atomization in order to minimize overspray. Apply the material in one wet coat over-lapping
each pass 50%. To repair HT-4H, or to add thickness, the area should be cleaned and all loose
material and dust should be removed. Spray material on an area larger than that being repaired.
Special attention should be give to all edges, pits, welds, corners, rivets and other rough spots to
insure complete coverage.
Tint the appropriate base using industrial colourants. Do not use water based colourants. Colours
are not stable and will darken as 149ºC (300°F) is approached.
Note: VOC values are typical and are provided for guidance purpose only. These may be subject
to variation depending on factors such as differences in colour and normal manufacturing
tolerances.
SYSTEMS
COMPATIBILITY
The following primers are recommended for HT-4H:
Cathacoat 302H
Cathacoat 302HB
Cathacoat 304V
Page 3 of 4
Cathacoat 302HA
Cathacoat 304L
HT-4H
High Temperature Silicone Acrylic
D ADDITIONAL
et INFORMATION
ail
T
o
p
Further information regarding industry standards, terms and abbreviations used in this data sheet
can be found in the following documents available at www.international-pc.com:
• Definitions & Abbreviations
• Surface Preparation
• Paint Application
• Theoretical & Practical Coverage
Individual copies of these information sections are available upon request.
SAFETY
PRECAUTIONS
This product is intended for use only by professional applicators in industrial situations in
accordance with the advice given on this sheet, the Material Safety Data Sheet and the
container(s), and should not be used without reference to the Material Safety Data Sheet (MSDS)
which International Protective Coatings has provided to its customers.
All work involving the application and use of this product should be performed in compliance with all
relevant national, Health, Safety & Environmental standards and regulations.
In the event welding or flame cutting is performed on metal coated with this product, dust and
fumes will be emitted which will require the use of appropriate personal protective equipment and
adequate local exhaust ventilation.
If in doubt regarding the suitability of use of this product, consult International Protective Coatings
for further advice.
Rect Top
PACK SIZE
Unit Size
1 US gal
5 US gal
Vol
1 US gal
5 US gal
Pack
1 US gal
5 US gal
For availability of other pack sizes, contact International Protective Coatings.
SHIPPING WEIGHT
(TYPICAL)
STORAGE
Unit Size
1 US gal
5 US gal
Shelf Life
11 lb
54 lb
24 months minimum at 25°C (77°F). Subject to re-inspection
thereafter. Store in dry, shaded conditions away from sources of
heat and ignition.
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Bottom
Important Note
The information in this data sheet is not intended to be exhaustive; any person using the product for any purpose other than that specifically recommended in this data sheet without first
obtaining written confirmation from us as to the suitability of the product for the intended purpose does so at their own risk. All advice given or statements made about the product
(whether in this data sheet or otherwise) is correct to the best of our knowledge but we have no control over the quality or the condition of the substrate or the many factors affecting the
use and application of the product. Therefore, unless we specifically agree in writing to do so, we do not accept any liability at all for the performance of the product or for (subject to the
maximum extent permitted by law) any loss or damage arising out of the use of the product. We hereby disclaim any warranties or representations, express or implied, by operation of
law or otherwise, including, without limitation, any implied warranty of merchantability or fitness for a particular purpose. All products supplied and technical advice given are subject to
our Conditions of Sale. You should request a copy of this document and review it carefully. The information contained in this data sheet is liable to modification from time to time in the
light of experience and our policy of continuous development. It is the user's responsibility to check with their local representative that this data sheet is current prior to using the product.
This Technical Data Sheet is available on our website at www.international-marine.com or www.international-pc.com, and should be the same as this document. Should there be any
discrepancies between this document and the version of the Technical Data Sheet that appears on the website, then the version on the website will take precedence.
Copyright © AkzoNobel, 05/02/2015.
All trademarks mentioned in this publication are owned by, or licensed to, the AkzoNobel group of companies.
www.international-pc.com
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