Two-Component Water-Borne Epoxy Primer Supplier in China
Two-Component Water-Borne Epoxy Primer paint coating manufacture Shenzhen China  
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Two-Component Water-Borne Epoxy Primer

Water Based Two-Component Epoxy Polyamide Finish
Water-Borne High Performance Acrylic Metal Primer
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Water-Borne High Performance Acrylic Metal Primer
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Acrylic Water borne Paint Eggshell Waterborne Interior Paint
Environmentally Friendly Waterborne Metal Primer
Fast Drying Interior Exterior Primer
Acrylic Water borne Paint
High Gloss Waterborne Aliphatic Polyurethane Enamel

  

Two-Component Water-Borne Epoxy Primer

PRODUCT SPECIFICATIONS:

PRODUCT DESCRIPTION
HJ-777 primer is a two-component water-borne epoxy
primer designed to penetrate and seal porous wood
and concrete substrates prior to the application of high
performance surface-applied coating systems.

TYPICAL PROPTIES


Description

Test Method

Results

Weight/Gal (mixed)

ASTM D1475

8.6 lbs/gal

Weight Solids (mixed)

ASTM D49

32%

Volume Solids (mixed)

Calculated

28%

Viscosity (mixed)

ASTM D2196

50 cps

VOC (mixed)

EPA Method 24

85 g/L

MVT @ 7 Mils

ASTM E96

0.42 Perms

Adhesion to Concrete

ASTM D4541

300 psi

Flash Point

ASTM D3278

None

Mix Ratio 7779:7781

 

4:1 by volume

APPLICATION & ENVIRONMENTAL LIMITATIONS
• Measure air temperature near concrete surface.
Recommended air temperature for application is
between 59 - 122oF (15 - 50oC).
• Recommended range of Relative Humidity for application
is between 45 - 75%.
• Minimum concrete (substrate) temperature is 60oF
(15oC).
• Temperature of concrete must be at least 5oF (3oC)
above the air dew point during coating application
and cure time.
• Avoid primer application when air temperature is
decreasing, especially in cold weather.
• Avoid application on a damp surface.
RECOAT TIME
• 1.5 hours under normal conditions of temperature
and relative humidity.
• Up to 3 hours at low temperature and high relative
humidity.
MIX-RATIO SENSITIVITY
• HJ-777 mix ratio by volume is 4:1 and must not
be changed.
• Poor mixing or incorrect proportioning when mixing a
smaller volume may affect cured film properties.
• Off-mix ratio can result in film water sensitivity and/or
intercoat adhesion issues.
• Induction time is not required.
• Mix HJ-777 thoroughly before application.
• Avoid cross-contamination by mixing equipment
when preparing small volumes.
FILM THICKNESS LIMITATIONS
• Recommended application rate is 300 ft2 per gallon.
• Cure time will increase if applied at high wet film thickness,
especially at low temperature and high relative
humidity.
• Thick film application on a hot concrete surface may
cause blistering and mud cracking.
USUABLE POT LIFE OF HJ-777 AFT MIXING
• Neither viscosity nor temperature change will indicate
end of HJ-777 pot life.
• Pot life of HJ-777 is 6 hours under normal conditions
of temperature and relative humidity.
• Physical properties of HJ-777 like adhesion, gloss
and hardness will decrease if primer is applied beyond
its usable pot life.
• Mix only the amount of material than can be applied
within HJ-777 usable pot life.
• Dispose according to local regulations HJ-777
material that has passed its usable pot life.
CONCRETE ADHESION OV USEABLE MIXED LIFE
• Adhesion to concrete is in general larger than concrete
cohesion.
• Adhesion to concrete ranges from 300 psi to more
than 400 psi depending on concrete quality.
SUBSTRATE LIMITATIONS
• HJ-777 must be able to wet the substrate (concrete).
• Surface must be free of excessive moisture.
• Surface must be free of contaminants.
• Surface must be free of water-repellent compounds.
Avoid weakening concrete
surface by aggressive shotblasting.
• Concrete should be able to resist a 250 psi pull.
• Check concrete substrate for alkalinity, chloride and
moisture content.
ADHESION OF TOPCOATS AS HJ-777 AGES
• Adhesion of polyurethane base coat is not affected
by epoxy primer age. Adhesion tested at 3, 5 and 7
days after primer application showed no significant
difference.
• It is good practice to recoat as soon as the primer is
cured to avoid potential surface contamination that
may affect intercoat adhesion.
• Avoid extended exposure of epoxy primer to UV rays.
SUITABLE SUBSTRATES FOR HJ-777
• Concrete
• Wood
PRODUCTS THAT BOND WELL TO HJ-777

• Adhesion tested without accelerator under Conditions
of low temperature and high humidity (*).
• Adhesion tested with accelerator under conditions of
low temperature and high humidity (**).
STORAGE AND HANDLING
HJ-777 will freeze and become unusable below 32°F
(0°C). Do not ship or store unless protection from freezing
is available. Do not apply if conditions will not permit
complete cure before rain, dew or freezing temperatures
occur. Do not apply in the late afternoon if moisture
condensation can appear during the night. Do not apply
HJ-777 at temperatures below 50°F (10°C).
HEALTH AND SAFETY
Read the Material Safety Data Sheet (MSDS) and container
labels for detailed health and safety information.
This product is intended for industrial use by properly
trained professional applicators only.

 



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