Description Not Recommended for
A inorganic hybrid zinc-rich high temperature primer, Thurmalox 837 is not recommended for exposures to:
formulated to withstand continuous operating
Acids, alkalis and salts which have a pH range
temperatures to 1000¡ãF (538¡ãC) with peaks to 1200¡ãF outside that of 5-10.
Salts (satisfactory with topcoats)
(649¡ãC) when topcoated with Thurmalox 225HD.
Chlorinated solvents which readily hydrolyze to
Thurmalox 837 Contains 85% zinc in the dry film for
form hydrochloric acid
long term galvanic corrosion protection when applied to
Crude oils with acid numbers above 0.4 or
a properly prepared surface. This primer can be used
hydrogen sulfide content above 300 PPM
by itself in uninsulated service when temperatures are
below 800¡ãF or with a Dampney high temperature
Surface Preparation
finish coat when service conditions exceed 800¡ãF
Remove all grease and oil by solvent cleaning per
and/or surfaces are insulated.
Steel Structures Painting Council Specification SSPC-
NOTE: Thurmalox 837 meets the requirements of
SP1, "Solvent Cleaning." Use Dampney 170 "Cleaning
ASTM D 520 Type II and contains less than 0.0002%
Solvent".
lead and can be classed as lead free.
High Temperature surfaces, for best results all
Recommended Uses
surfaces should be free of all foreign matter. Abrasive
Thurmalox 837 is recommended for exposed steel in
blast all surface per Steel Structures Painting Council
high temperature exterior service.
Specification SSPC-SP10, "Near White Blast," or per
Stacks, Breechings, Boiler Casings.
NACE Specification No. 2 with a 1.5 ¨C 2.0 mil profile
Chemical Plant and Refinery Equipment.
depth in all blasted surfaces.
Heaters, Cat-crackers, Reformers.
In preparing steel surfaces, follow the procedure
Structural steel, Reaction Vessels, Tanks
outlined below.
Furnaces, Kilns, Ovens.
1. Remove all flux, splatter and slag left from
Piping, Pumps, Manifolds.
welding.
Process Vessels, Heat exchangers.
2. Grind all rough welds until smooth and break
Preconstruction and Fabrication Priming
sharp edges.
3. Remove any grease, oil or dirt by solvent cleaning
Features
per Specification SSPC-SP1, "Solvent Cleaning."
Corrosion control mechanism via sacrificial cathode
4. Sandblast per specifications outlined above.
with galvanic protection.
5. Remove all remaining abrasive from surface by
Abrasion Resistance, the film improves in hardness
brush or air blast.
and adhesion upon aging and weathering exposure
6. Coat freshly-blasted surfaces as soon as
Rapid Curing - permitting recoating within 12-16
possible. (See Application Guide Lines Section for
hours except under unusual atmospheric
Instructions). DO NOT allow the Thurmalox 837 to
conditions. (See curing section for further details)
be exposed to rain before curing takes place. DO
Pot Life - Working time of 6-8 hours (at 70-90¡ãF)
NOT wash freshly blasted surface with solvents.
can be expected after mixing.
Resistant to hydrocarbon and many other organic
chemicals.
Heat resistant up to temperatures of 1000¡ãF
Mixing
Application Equipment
Thurmalox 837 is supplied in 3 parts, consisting of Part
Conventional Spray Equipment: Use material as
A liquid Base, Part B catalyst and Part C Zinc additive
supplied.
that must be mixed prior to application. Mix zinc
As a guide only...
component (C) slowly into vehicle Base (A) using an
Spray Gun Binks 62
explosion-proof Jiffy Mixer. Add zinc (C) to liquid
Air hose 5/16"(I.D.)
base (A) only. DO NOT reverse mixing procedure,
*Fluid hose 3/8" (I.D.)
then add catalyst (B) and mix thoroughly, until free
Air cap 63PB
of lumps. Pour mixture through 30 mesh screen to
Tip 66SS
remove any lumps. When mixed, Thurmalox 837
Pot pressure 10-20 lbs.
should be continuously agitated. Do not agitate so
Atomizing pressure 30-40 lbs.
vigorously that air becomes trapped in the coating. Use
Needle adjustment Full open
mixed product within the working pot life.
Distance from work 8-10"
Pot Life
Airless Spray Equipment: Use material as supplied.
The pot life of Thurmalox 837 is 6-8 hours after mixing. As a guide only...
Always maintain continuous agitation of the mixed Spray Gun Graco 205-591 Gun
components until coating is completely used up. DO Tip Size .011 to .021 (0.38-053mm)
NOT mix more material than can be applied within 30 Pump Graco 28:1 or larger ratio pump
to 40 minutes of pot life or before gassing or separation Fluid Pressure 1,600psi (112kg/cm2) minimum
of liquid and solids occurs. Fluid Hose* 3/8" (9mm) maximum length of 50ft.
Air Press. To 40-50 lbs
Application Guidelines
Pump
*Smaller hose diameters, or hose lengths greater than
Note: Apply Thurmalox 837 Inorganic Zinc High
25 feet may make it necessary to increase pressure.
Temperature Primer via spray application only.
Apply Thurmalox 837 at 4.0 - 5.0 mils of dry film
Work Stoppage: Do not allow Thurmalox 837 to
thickness allowing to cure completely. Note curing time
remain in hoses, gun or spray equipment; thoroughly
will vary with film thickness and when air movement
flush all equipment with DAMPNEY 155 THINNER. If
and ventilation are restricted or low temperatures or
prolonged work stoppages occur a fresh batch of
humidity's are encountered. After curing is complete
Endcor 837 should be used. NOTE: Once Thurmalox
(refer to "curing time"), pressure wash with clean fresh
837 is mixed it should not be resealed.
water at 3,500 psi using a rotating nozzle to remove
any and all zinc salts before application of the
Recommended Topcoats
Thurmalox high temperature coating. Allow the
Thurmalox 837 Inorganic Zinc Rich High Temperature
Thurmalox 837 to dry completely, followed by a spray
Primer can be top coated with select Thurmalox High
application of a mist coat of Thurmalox high
Temperature Coatings. Allow coating to dry completely
temperature coating, followed by a full coat of
before application of any of these recommended
Thurmalox high temperature coating at 2.5 to 3.0** mils
topcoats.
of dry film thickness. Do not allow freshly applied
Thurmalox 837 to be exposed to rain or water until
Used by itself¡.
coating has cured completely.
Thurmalox 837 Primer 5.0-6.0 mils
** SEE FINISH COAT PRODUCT BULLETIN FOR THE
(125-150 microns)
CORRECT APPLIED DRY FILM THICKNESS.
Or in a System
Apply Thurmalox 837 only by spray. Brush only when Primer Coat
coating is difficult-to-spray such as small areas or small Thurmalox 837 Primer Coat 2.5-3.0 mils
parts. Coating dry film thickness should be 3.0-5.0 mils (67- 75 microns)
maximum (5-7 wet mils).
Finish Coat
Thurmalox 225HD (Under 4.0 ¨C 6.0 mils
SPRAY APPLICATION: Apply in even coating with
Insulation) (100 -150 microns)
parallel passes, overlap each pass 50 percent. Pay
(Or Uninsulated) 2.0-2.5 mils
special attention to welds, sharp edges, rivets,
Thurmalox 230/230C (37-50 microns)
bolts, etc., to insure proper film thickness.
(color stability to 1000¡ã F)
Flush all spray equipment with Dampney 155 Thinner
Thinning
to remove any moisture that may be in the line or spray
Thurmalox 837 is supplied at spray viscosity and
equipment prior to use. Continuously mix liquid with an
normally needs no thinning. NEVER use more than 1
explosion-proof power mixer.
under-film corrosion.
Curing Time
Where scheduling is critical, film hardening can be
accelerated by an application of water spray or low
Thurmalox 837 is self-curing and requires moisture to
pressure steam. At very low humidifies more than one
complete the curing reaction. The drying time to film
water application with drying periods in between may
insolubility is dependent on film thickness, temperature,
be necessary. After such water applications top
relative humidity, and air circulation. Flow of air over
coating may proceed as soon as the surface is dry.
the surface has a pronounced effect in reducing drying
time. See Technical Data section for curing data.
Precautionary Information
Water misting is beneficial when humidity drops below
30% to accelerate the curing mechanism. WARNING: FLAMMABLE LIQUID AND VAPOR.
VAPOR HARMFUL. CAUSES EYE IRRITATION.
Storage
VAPOR HARMFUL. Keep away from heat, sparks and
flame. VAPORS MAY CAUSE FLASH FIRE. Use only
Store in a cool, dry place, preferably between 40¡ãF -
with adequate ventilation. Do not breathe vapors or
80¡ãF (4¡ãC - 38¡ãC). Do not store above 100¡ãF or in a
spray mist. Ensure fresh air entry during application
relative humidity greater than 50 %.
and drying. If you experience eye watering, headache
or dizziness or if air monitoring demonstrates
Clean up
vapor/mist levels are above applicable limits, wear an
Clean spray equipment, brushes, spillage, etc. with
appropriate, properly fitted respirator (NIOSH
Dampney 155 Thinner as soon after use as practical to
approved) during and after application. Follow
prevent hardening of Thurmalox 837. Hardened
respirator manufacturer's directions for respirator use.
material can be removed from equipment with a 10%
Close container after each use. Avoid contact with
solution of caustic soda. Note: Caustic solutions will
eyes. Wash thoroughly after handling. Observe all
attack aluminum.
safety precautions and follow procedures described in
OSHA regulations. See Material Safety Data Sheet
Recoating
(MSDS) for complete precautionary and disposal
The coating, usually 30 minutes after application, is
information.
resistant to water, rain, or condensation.
The film is not subject to ultraviolet degradation and is
If instructions and warning cannot be strictly followed,
extremely serviceable in normal atmospheric
do not use this product.
weathering exposures.
The cured vehicle is insoluble in a large variety of
FOR INDUSTRIAL USE ONLY
organic solvents and is serviceable in exposures of
fumes, splash, and spills of oils and solvents.
In marine coastal exposures the presence of salt and
industrial contaminants tends to accelerate the
sacrificial reaction of the zinc metal in the film. The use
of appropriate topcoats reduces the rate of zinc
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