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Power outages due to dirty insulator flashover are an expensive nuisance to industries that require an uninterrupted power source. Flashovers cause hours of machine downtime and unnecessary expenses.
PREVENT AND ELIMINATE THE EXPENSE OF INSULATOR FLASHOVERS WITH Si-COAT 570 HVIC
Insulator flashover results from contamination that settles on the insulator surface. Whencombined with environmental moisture, leakage current develops which can lead to flashover. Older methods to prevent flashover such as frequent water washing or greasing are time consuming.
Instead, coat your insulators with Si-COAT 570 HVIC; the coating which has proven itself to give the best flashover protection for years upon years – even in the most adverse of conditions.
Si-COAT 570 HVIC is a one-part, room temperature vulcanizing (RTV) polysiloxane (silicone) coating. It’s unique and patented formulation provides a highly hydrophobic surface for its entire life. Because it is a Si-COAT product, it is not affected by UV light, corona discharge, chemical contaminants, salt, extreme temperatures or corrosive environments.
Si-COAT 570 HVIC is engineered with exact amounts of non-reactive, low molecular weight silicone and ingredients with precise particle sizes for optimum performance and reliability. The benefits are twofold: Superior retention of hydrophobicity, ensuring a tremendously long life span, and a more robust self-cooling mechanism to protect the surface from physical damage in the case of dry band arcing.
No heat is required to cure Si-COAT 570. This means the free fluid in the coating does not react during curing. Thus, more free fluid is available – dramatically enhancing coating performance.
Si-COAT 570 HVIC applies very smoothly and easily. This translates into a material saving and enhanced performance characteristics.
On your next project, choose Si-COAT 570 HVIC for the world’s most reliable protection against leakage current leading to flashover.
| 1 Introduction | | | | Si-COAT 570 High Voltage Insulator Coating (HVIC) is a room temperature vulcanizing
(RTV) silicone product. Unlike competitive products, it is supplied ready-to-use without
the need of additional thinning or excessive mixing/shaking before use. Si-COAT 570 HVIC
is based on extensive research and development work that lead to the award of a patent.
The basis of the Si-COAT 570 patent is the optimally-sized alumina trihydrate (ATH)
particle and the optimum concentration of the ATH ingredient, discovered by the
engineers and chemists at CSL Silicones Inc. The presence of ATH in the formulation of the
HVIC is necessary to protect the coating from the damaging effects of tracking under high
electrical activity along the surface of the coating. It is essential that the ATH particle be
optimally-sized and in an optimum concentration in order to promote long-term
hydrophobicity of the coating.
The downside to the presence of ATH is the potential for the filler to settle during storage
and transportation. In order to alleviate the problem, competitive coatings rely on a very
fine particle size ATH (below 1 micron diameter). However, this fine particle size is far from
the optimum size (13 microns) patented by CSL. By virtue of other key ingredients and a
unique manufacturing process, the engineers and chemists behind Si-COAT 570 have
achieved a finished product in which the larger 13 micron ATH particle will not settle.
Hence, excessive agitation prior to application is unnecessary, making Si-COAT 570 one of
the easiest HVICs to use.
Apart from its very long life and ease-of-use qualities, Si-COAT 570 was the first to
introduce the benefit of strong adhesion to the insulator surface. It is ideally suited for
unprimed application to glass, porcelain and polymer (silicone and EPDM) insulators
under all voltage conditions from distribution to very high voltage. Over its greater than
15 years of service history, Si-COAT 570 has distinguished itself from its competition by
virtue of flawless performance without a single failure of any type. That is far more than
any competitor can claim of their HVIC.
For ultimate suppression of leakage current and an untarnished service life greater than
that of any other HVIC, turn to Si-COAT 570 by CSL Silicones Inc. | | 2 Product Description | |
| A single component, RTV, moisture cure, high-build polysiloxane coating providing
excellent long-term hydrophobicity, hydrophobicity recovery, electrical characteristics and
UV tolerance leading to suppression of leakage current, reduction of pollution related
flashover risk and a long service life.
| | 3 Intended Uses | | | | Suitable for use on both new insulators and old insulators to be refurbished. Can be used,
unprimed, on a variety of insulator substrates including glass, porcelain, HTV silicone, LSR
type silicone and EPDM.
Further suitable as a refresh coating over old silicone HVICs provided the old HVIC is
properly cleaned and still displays strong adhesion to the insulator surface.
Can be used in a wide variety of pollution environments including, but not limited to, salt
spray, salt fog, industrial (cement dust, fly ash, carbon black, acid emissions, etc.) and
desert sand.
Designed for use in AC and DC systems, in substations of all voltage levels and on
transmission lines under all voltage conditions ranging from low distribution voltages to
very high transmission voltages.
| | 4 Practical Information | | | | | Color | Standard color is grey. Custom colors may be available dependent
on formulation requirements.
| | Gloss Level | Semi-gloss
| | Percent Solids | 57% by volume
70% by weight | | Typical Thickness | 15.0 to 20.0 mil (381 to 508 micron) dry film thickness (DFT)
Equivalent to…
26.0 to 35.0 mil (660 to 890 micron) wet film thickness (WFT)
| Theoretical
Coverage | | DFT | 15.0 mils
(381 µ) | 20.0 mils
(508 µ) | sq. ft per
US gal | 61.0 | 45.7 | sq. ft per
lb | 6.5 | 4.9 | sq. m
per liter | 1.5 | 1.1 | sq. m
per kg | 1.3 | 1.0 |
| Practical Coverage
| Allow appropriate loss factor and calculate as follows:
Practical Coverage = Theoretical Coverage x [100% - Loss%]
| Method of
Application
| Airless spray, brush or dip
| Application
Temperature Range | 41 to 140°F (5 to 60°C) [ambient]
41 to 266°F (5 to 130°C) [substrate]
| | Drying Time | Skin-over Time: 15 minutes (at standard conditions* )
Tack-free Time: 30 minutes (at standard conditions)
Cure Through: 6 hours (at standard conditions)
Full Physical Characteristics: 7 days (at standard conditions)
|
| | 5 Regulatory Data | |
| | Flash Point | 100°F (38°C) | | Product Weight | 9.4 lb/US gallon (1.13 kg/liter)
| | VOC | 3.26 lb/US gallon (390.10 g/liter) |
| | 6 Physical Properties | | | | | UNCURED | | | Appearance | Thick paint | | Viscosity | 1,350 ± 150 cP | | Cure System | Neutral, moisture cure | | CURED | At standard conditions for 7 days | Dielectric Strength
| 735.5 V/mil (290.5 kV/cm) [ASTM D149] | | Volume Resistivity | 2.9 x 1016 Ω.in (7.3 x 1016 Ω.cm) [ASTM D257] | | Surface Resistivity | 2.2 x 1015 Ω.in (5.5 x 1015 Ω.cm) [ASTM D257] | | Dissipation Factor | at 100 Hz: 0.01; at 100 kHz: 0.0057 [ASTM D150] | | Dielectric Constant | at 100 Hz: 3.93; at 100 kHz: 3.86 [ASTM D150] | Tracking Wheel
Withstand | >1000 hrs.
| | Dry Arc Resistance | track: 180 sec; burn out: 450 sec | Temperature
Stability | -40 to 480°F (-40 to 250°C)
| | Thermal ExpansionCoefficient | (0.24 x 10-4 cm/cm.°C) | Thermal
Conductivity | 0.170 BTU/hr.ft.°F (7.0 x 10- Cal/sec.cm.°C) | | Loss Tangentat 60 Hz | 5.5 x 10-3 | Water Repellency
Angle | 120 degrees
| UV Accelerated
Weathering
| No degradation [ASTM G53 Series, 5000 hours] |
| 7 Surface Preparation
| |
| All surfaces to be coated should be free of dirt, dust, grease, oil, release agents, curing
compounds, and other foreign matter including frost. In addition, prior to applying the
coating, all surfaces must be dry. Such precaution will ensure proper adhesion of the
Si-COAT 570 coating to the insulator surface.
High-pressure water washing is the suggested method for cleaning the insulator surface.
The recommended pressure washing parameters are 3,000 psi @ 8 – 10 gallons per minute
(210 kg/cm2 @ 30 – 40 liters per minute). Insulators contaminated with cementitious
material should be cleaned with a dry abrasive cleaner such as crushed corncob or walnut
shells mixed with limestone.
For insulators covered in silicone or hydrocarbon grease, remove the bulk of the grease
with a dry abrasive cleaner as above, or by hand wiping with a rag. Once the bulk of the
grease has been removed, the surface should be wiped clean using an oil-free solvent
such as acetone. Isopropyl alcohol is suggested for the final wipe and coating should
commence once the insulators are dry.
If for whatever reason the Si-COAT application is delayed after cleaning of the insulator,
the insulator must be re-cleaned.
| | 8 Coating Application | | | | Mixing
| Si-COAT 570 is supplied as a one-part, ready-to-use coating. It is
normal, however, during shipment or extended storage, for carrier
solvent to rise to the top of the container. Upon opening of the
container, mix by hand or by power agitator until an even
consistency of coating is obtained.
| | Application | All surfaces should be clean and dry prior to application. The
coating should be applied in a manner that prevents runs, sags,
drips, spills, etc. and that completely covers surfaces without
holidays. The temperature of the surface to be coated should be
between 41 and 122°F (5 and 50°C) and environmental
temperature should be at least 5°F (3°C) above the dew point prior
to and during application.
All areas particularly prone to corrosion such as the caps and pins
of insulator discs can also be coated to provide added protection
and a uniform monolithic surface
The entire insulator should be coated with a minimum 15.0 mil
(381 micron) to 20.0 mil (508 micron) DFT of Si-COAT 570. The
maximum advisable DFT of Si-COAT 570 is 50 mil (1,270 micron).
| | Airless Spray | | Recommended | . Tip sizes to range from 17 to 21 thou
(432 to 533 micron) with a 6 to 10 inch (15
to 25 cm) fan at 1 ft (30 cm) distance
| | | -- Pump pressure ratio of 40:1 | | | - Total output fluid pressure at spray tip not
less than 2,000 psi (141 kg/cm2)
| | | - minimum ½ in (1.3 cm) ID, maximum 50 ft
(15 m) length spray line | | | - See recommended spray apparatus in Section 9 | | | |
| | Dip | | Suitable | | | | - Constant nitrogen purge should be used
over liquid surface in container to avoid
formation of skins while dipping
| | | - Rotate insulators after dipping to avoid
formation of drip marks | | | - Generally, higher DFT is achieved.
Thinning may be necessary |
| | Brush | | Suitable | | | | - Generally, 10 to 15 mil (254 to 381 micron)
DFT can be achieved
|
| | Thinner | Naphtha or Odorless Mineral Spirits. It is recommended, however,
that Si-COAT 570 be used at the viscosity supplied. If product is
thinned, do not exceed local environmental legislation.
| | Cleaner | Naphtha or Odorless Mineral Spirits | Work Stoppages &
Restarts
| It is not recommended that prolonged work stoppages occur upon
only partial consumption of a container of Si-COAT 570.
If work must stop after only a portion of a container of Si-COAT 570
is consumed, seal air and moisture contact from coating by
covering the surface of the coating with a sheet of polyethylene
film. Reseal the container to be airtight.
Upon reopening the container to restart work, peel back the
polyethylene film. If curing of the coating has occurred, use a
utility knife to cut the cured coating away from the wall of the
container. Peel away the cured layer of coating to expose fresh
coating underneath.
| | Clean-up | Do not allow material to remain in hoses, gun or spray equipment.
Thoroughly flush all equipment with cleaner as selected from
above.
Fully cured coating is environmentally benign and suitable for
landfill disposal. However, always check local environmental
regulations before disposal. |
| | 9 Recommended Spray Apparatus | |
| Part Description .
| Graco Part No | 2 gallon ASME 100% stainless steel pressure tank with airpowered
agitator | 236-156 | | Gun/air dual regulation kit | 235-042 | | Fluid outlet strainer | 240-418
| HVLP (High Volume, Low Pressure) spray gun complete with
0.042 in. (1.067 mm) fluid nozzle
| 239-560 | | Air spray gun complete with 0.110 in. (2.794 mm) fluid nozzle | 239-545 | Fluid hose assembly, nylon tube, neoprene cover 25 ft. (7.6 m)
length, 3/8 in. (9.5 mm) ID
| 205-142
| Air hose assembly, BUNA-N tube, neoprene cover 25 ft.
(7.6 m) length, 5/16 in. (7.9 mm) ID
| 210-867 | | Polyethylene tank liner (20 per case) | 112-632 | | Air line desiccant dryer | 106-493 | | Air line filter | 106-149 | | Repair kit for HVLP gun needle/nozzle | 239-601 | | Repair kit for air spray gun needle/nozzle | 239-595
| | Graco gun repair kits for spray guns | 237-398 | Tips for airless spray gun
[xxx refers to the last three part numbers of Graco tips]
| 286-xxx |
| | 10 Product Characteristics | | | | Level of sheen and surface finish is dependent on application method. Avoid using a
combination of application methods whenever possible. Best results in terms of gloss and
appearance will always be obtained with airless spray.
If overcoating after weathering or ageing, ensure the coating is fully cleaned to remove all
surface contamination such as dust, grease, oil, salt crystals, traffic fumes, etc. before
application of a further coat of Si-COAT 570.
This product must only be thinned using the recommended thinners. The use of alternate
thinners may inhibit the curing mechanism of the coating.
Do not apply to substrate temperatures below 41°F (5°C).
When applying Si-COAT 570 in confined spaces ensure adequate ventilation and/or
respiratory equipment. Consult Si-COAT 570 MSDS for further details.
Condensation occurring during or immediately following application may result in a matte
finish.
Si-COAT 570 has excellent tolerance to airborne chemical exposure. When severe chemical
or solvent splashing/pooling is likely to occur please contact CSL Silicones Inc. for
information regarding suitability.
| | 11 Systems Compatibility | |
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The following primers/intermediates are suitable for use with Si-COAT 570:
CSL-944™ Primer
All Si-COAT® branded products are compatible for use as basecoats or topcoats with each
other.
| | 12 Safety Precautions | | | | This product is intended for use only by professional applicators in industrial situations in
accordance with the advice given in this document, the Material Safety Data Sheet (MSDS)
and the container(s), and should not be used without reference to the MSDS that CSL
Silicones Inc. 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 may be emitted that 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 CSL Silicones Inc. for
further advice.
| | 13 Packaging | | | | | Package Size | Product Volume | Product Weight | Shipping Weight | | 1 US gal unit | 1.0 US gal (3.8 liter) | 9.5 lb (4.3 kg) | 11.0 lb (5.0 kg) | | 2.5 US gal unit | 2.5 US gal (9.5 liter) | 23.6 lb (10.7 kg) | 26.5 lb (12.0 kg) | | 5 US gal unit | 5.0 US gal (18.9 liter) | 47.1 lb (21.4 kg) | 51.5 lb (23.4 kg)
| | 50 US gal unit | 50.0 (189.3 liter) | 470.6 lb (213.9 kg) | 514.8 lb (234.0 kg) |
For availability of other package sizes, please contact AAIS, LLC.
| | 14 Storage Shelf Life | | | | Minimum 12 months from date of manufacture at 90°F (32°C).
Subject to re-inspection thereafter. Store in dry, shaded
conditions away from sources of heat or ignition. |
Disclaimer
The information given in this sheet is not intended to be exhaustive and any person using the product for any purpose other than that specifically recommended in this document without first obtaining
written confirmation from CSL Silicones Inc. as to the suitability of the product for the intended purpose does so at his/her own risk. Any warranty, if given, or specific Terms & Conditions of Sale are contained
in CSL’s Terms & Conditions of Sale, a copy of which can be obtained upon request. While CSL endeavors to ensure all advice it gives about the product (whether in this document or otherwise) is correct, we
have no control over either the quality or condition of the substrate or the many factors affecting the use and application of the product. Therefore, unless CSL specifically agrees in writing to do so, it does not
accept any liability whatsoever or howsoever arising for the performance of the product, or for any consequential loss or damage arising out of the use of the product. The information contained herein is
liable to modification from time-to-time in light of experience and CSL’s policy of continuous product improvement.
It is the user’s responsibility to check that this document is current prior to using the product.
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