ZYP Coverguard Graphite Protective Anti-Oxidizing Coating - Pyrotek

PAINTABLE COATING THAT
REDUCES CARBON LOSS
AND COSTLY COMPONENT
REPLACEMENT
• SETTERS
CRUCIBLES, MOLDS
DIES, LINERS, RAMS
SUPPORTS, PEDESTALS
RETAINERS
ELECTRODES
TUBES, SPOUTS
KEY ADVANTAGES
ZYP Coatings, Inc.
120 Valley Court
Oak Ridge, TN 37830
Ph: (865) 482-5717
FAX: (865) 482-1281
Extends lifetime and increases quality.
Reduces downtime and maintenance costs.
Cost-effective — less than $0.25 ft. 2
Protects to above 1000 C (1800 F) in air.
High emissivity
Easy application like house paint.
Hard and abrasion resistant.
Thermal shock resistant.
Withstands cyclic use.
Usable for all graphite grades.
APPLICATION NOTES
COVERGUARD
STOPS GRAPHITE BURNING TO ABOVE 1800 F
Graphite protected with Coverguard
Unprotected
graphite
SPECIFICATIONS
Color................................................... Gray to Black
Use Temperature ...................... > 1000 C(> 1800 F)
Use Atmosphere .................Oxidizing/Vacuum/Inert
Slightly Reducing
Shelf Life .................................................. One Year
Coverage.................................... 250-500 ft. 2 /Gallon
Constituency ...................................Silicon Carbide,
Oxyphosphate Bonded
Solubility ..................... Water insoluble after heating
to above 350 C (660 F)
Coating Thickness ................................ 2 to 4 coats
recommended (3 to 10 mils)
For best results, apply 2 to 4 coats (3 to 10 mils) by brush or spray. Thoroughly dry the coating between
applications. Water may be used for thinning and cleaning of tools. These coatings will become hard and
water insoluble after heating to above 350 C (660 F).
These recommendations are believed to be accurate. No guarantee of their accuracy is made and the products are sold without
warranty, expressed or implied. Customers shall make their own tests to determine suitability for their use.
Percent Weight Loss
0
20
40
60
80
100
Typical Weight Loss of
Protected Graphite vs Unprotected Graphite
5 10
Hours at 1832F (1 1/2-Hr.Cycles)
DISTRIBUTED BY PYROTEK INC.
9503 E. Montgomery Ave. Spookane, WA 99206 1-800-PYROTEK Phone: (509) 926-6212 Fax (509) 927-2408 PY-05-02-669

USE INSTRUCTIONS
FOR PROTECTING GRAPHITE FROM OXIDATION
DURING USE WITH MOLTEN ALUMINUM
COVERGUARD
(Oxidation/Wear Protection)
1. Clean the graphite of oils, dust, etc.
Light grit blasting provides an excellent surface for coating.
2. Apply a thin layer of COVERGUARD preferably using a foam rubber brush - just like housepaint.
3. Allow to dry at room temperature and apply a second thin coating of COVERGUARD.
4. If no BORON NITRIDE top coating is to be used, simply allow to thoroughly dry at room temperature and
place into use.
BORON NITRIDE LUBRICOAT
(Non-Wetting Surface)
LUBRICOAT provides the very best non-wetting surface to molten aluminum and is often used as a top coating
over COVERGUARD.
1. For best results, heat the dried COVERGUARD coated graphite part to about 1500C (4000F) for about 15
minutes. Allow to cool to room temperature.
This elevated temperature cure is not absolutely necessary but if not performed will allow the LUBRICOAT to
mix with the COVERGUARD coating.
2. Apply one thin layer of LUBRICOAT using a brush or air-spray just like ordinary housepaint.
3. Allow to dry at room temperature and place into use.
BORON NITRIDE HARDCOAT
(Non-Wetting Surface)
For those uses where LUBRICOAT is proven not to provide sufficient resistance to erosion, HARDCOAT is
recommended.
1. It is absolutely necessary to cure the COVERGUARD before coating with HARDCOAT.
TO CURE:
a. Heat to 1500C (4000F) for 15 minutes and cool to room temperature
OR
b. Allow to dry at room temperature for a minimum of 24 hours.
2. Apply a thin coating of HARDCOAT and allow to dry at room temperature.
These are water-based coatings. Thoroughly dry before use. DO NOT CONTACT WET COATINGS WITH
MOLTEN METALS. Consult MSDS before use.