A high solids, low VOC, two component, epoxy zinc phosphate/micaceous iron oxide
primer, formulated on proprietary polymer technology which provides rapid cure and
overcoating even under low temperature conditions. Pigmented with zinc phosphate
As a primer for steelwork intended for service in a wide range of environmental
conditions, including offshore structures, chemical plants, industrial buildings, pulp and
paper mills, power plants and bridges.
Suitable for overcoating within 3 hours in most climatic conditions which can greatly
speed up production and throughput in fabrication shops.
Can also be used on site as a rapid curing industrial maintenance coating.
Colour Buff, Red oxide
Gloss Level Matt
Volume Solids 67%
Typical Thickness 75-100 microns (3-4mils) dry equivalent to 112-149 microns
(4.5-6.0 mils) wet
Theoretical Coverage 8.93 m2/litre at 75 microns d.f.t and stated volume solids
358 sq.ft/gallon at 3 mils d.f.t and stated volume solids
Practical Coverage Allow appropriate loss factors
Method of Application Airless spray, Air spray, Brush, Roller
Overcoating Interval with
Temperature Touch Dry Hard Dry Minimum Maximum
5°C (41°F) 40 minutes 4 hours 3 hours Extended*
15°C (59°F) 30 minutes 3 hours 2 hours Extended*
25°C (77°F) minutes 2 hours 1 hour Extended*
40°C (104°F) 15 minutes 30 minutes 30 minutes Extended*
Flash Point Base (Part A) C/A (Part B) Mixed
27°C (81°F) 28°C (82°F) 27°C (81°F)
Product Weight 1.7 kg/l (14.2 lb/gal)
VOC 3 g/l
2.67 lb/gal (3 g/l)
339 g/l, 6 g/kg
All surfaces to be coated should be clean, dry and free from contamination. Prior to
paint application all surfaces should be assessed and treated .
Oil or grease should be removed in accordance with SSPC-SP1 solvent cleaning.
Abrasive Blast Cleaning
Abrasive blast clean to SSPC-SP6. If oxidation has occurred
between blasting and application , the surface should be reblasted to the
specified visual standard.
Surface defects revealed by the blast cleaning process, should be ground, filled, or
treated in the appropriate manner.
HJ-1S is suitable for application to blast cleaned surfaces which were initially to
the above standard but have been allowed to deteriorate under good shop conditions for
up to 7-10 days.
Shop Primed Steel
Weld seams and damaged areas should be blast cleaned to
If the shop primer shows extensive or widely scattered breakdown overall sweep blasting
may be necessary.
Mixing Material is supplied in two containers as a unit. Always mix a
complete unit in the proportions supplied. Once the unit has
been mixed it must be used within the working pot life
(1) Agitate Base (Part A) with a power agitator.
(2) Combine entire contents of Curing Agent (Part B) with Base
(Part A) and mix thoroughly with power agitator.
Mix Ratio 3 parts : 1 part by volume
Working Pot 5°C (41°F) 15°C (59°F) 25°C (77°F) 40°C (104°F)
Life 6 hours 3 hours 2 hours 45 minutes
Airless Spray Recommended - Tip range 0.43-0.53 mm (17-21 thou)
- Total output fluid pressure at spray tip not
less than 176 kg/cm2 (2,500 p.s.i.)
Air Spray Recommended
(Pressure Pot) Air Cap 704 or 765
Fluid Tip E
Brush Suitable - small areas Typically 50-75 microns (2-3 mils) can be
Roller Suitable - small areas Typically 50-75 microns (2-3 mils) can be
Thinner HJ-102L Do not thin more than allowed by local
Work Stoppages Do not allow material to remain in hoses, gun or spray equipment.
Thoroughly flush all equipment with HJ-821D. Once
units of paint have been mixed they should not be resealed and it
is advised that after prolonged stoppages work recommences with
freshly mixed units.
Clean Up Clean all equipment immediately after use with HJ-821D. It is good working practice to periodically flush out spray
equipment during the course of the working day. Frequency of
cleaning will depend upon amount sprayed, temperature and
elapsed time, including any delays.
All surplus materials and empty containers should be disposed of
in accordance with appropriate regional regulations/legislation.
HJ-1S is preferred for use with systems for chemical environments where zinc based
materials can be subject to attack in both acidic and alkaline conditions.
The maximum overcoating interval will be dependent upon the integrity of the exposed film. A
film of 75 microns (3 mils) d.f.t. will normally be overcoatable after 6 months exposure provided it
is adequately cleaned and any areas of mechanical damage repaired.
Surface temperature must always be a minimum of 3°C (5°F) above dew point.
This product must only be thinned using our specified thinners. The use of alternative
thinners, particularly those containing Ketones, can severely inhibit the curing mechanism of the
Over-application should be avoided as thick films will not be as good a substrate for topcoat
adhesion after ageing as those at the specified thickness. When using as a blast holding primer
avoid over-application as thick films may suffer from cohesive film splitting if subsequent coats are
Low Temperature Curing
HJ-1S is capable of curing at temperatures below 0°C (32°F). However, this product should
not be applied at temperatures below 0°C (32°F) where there is a possibility of ice formation on
Temperature Touch Dry Hard Dry Minimum Maximum
-5°C (23°F) 60 minutes 10 hours 8 hours Extended
0°C (32°F) 45 minutes 7 hours 6 hours Extended
Touch dry times shown above are actual drying times due to chemical cure, rather than physical set
due to solidification of the coating film at temperatures below 0°C (32°F).
This product is not available in pale and pastel shades due to a tendency to discolour rapidly.
Additionally, in common with all epoxies HJ-1S will chalk on exterior exposure. However,
these phenomena are not detrimental to anti-corrosive performance.
HJ-1S is not intended for use as a primer for steelwork which may be subjected to
continuous immersion conditions.
HJ-1S can also be used as a primer for substrates other than blasted steel, e.g. stainless steel,
Absolute measured adhesion of topcoats to aged T- 21 is less than that to fresh material,
however, it is adequate for the specified end use.
Over-application will extend both the minimum overcoating periods and handling
times, and may be detrimental to long term overcoating properties.
This product has the following specification approvals:
HJ-1S will normally be applied to suitably prepared steel, e.g. blast cleaned. However, if
necessary application over prefabrication blast primers can be performed.
Further information regarding industry standards, terms and abbreviations used in this
data sheet can be found in the following documents available at www.polyurethane-paint.com:
• Definitions & Abbreviations
• Surface Preparation
• Paint Application
• Theoretical & Practical Coverage
Individual copies of these information sections are available upon request.
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 we 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
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 us for further advice.
litre unit HJ-1S Base 15 litres in a litre container
HJ-1S Curing Agent 5 litres in a 5 litre container
For availability of other pack sizes contact us
litre unit 30.6 kg (67.5 lb) Base (Part A) 5.3 kg (11.7 lb) Curing Agent (Part B)
Shelf Life 12 months minimum at 25°C (77°F). Subject to re-inspection
thereafter. Store in dry, shaded conditions away from sources
of heat and ignition.