RTV SILICONE RUBBER COATINGS

RTV SILICONE RUBBER COATINGS About

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Introduction

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INSILCOTE is a unique Room Temperature Vulcanised RTV silicone rubber formulation specifically developed by Mace Technologies South Africa in collaboration with the Electric Power Research Group of the University of the Witwatersrand for the prevention of pollution flashover of high voltage outdoor insulation

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The exceptional hydrophobicity of INSILCOTE inhibits the formation of continuous moist conductive layers on insulator surfaces This in turn limits the flow of leakage currents thus preventing the creation of dry bands and partial discharges critical steps in the flashover process

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The superior performance of silicone rubber over other insulating materials in polluted environments is well proven What makes silicone unique is the fact that owing to the migration of low molecular weight siloxanes that exist within the elastomer the water repellent properties are imparted to contaminants which accumulate on the surface Thus even when covered with a thick pollutions deposit hydrophobicity is maintained

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The exceptional waterrepellency of INSILCOTE and its rapid transfer of this characteristic to any covering contamination layer coupled with silicones inherent resistance to degradation by ultraviolet radiation ozone and most chemicals combination with the use of specialised fillers to combat power arc damage enables the material to provide enhanced system reliability over a period of many years even in the most extreme environments

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Technical Specifications

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Sr No

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Parameters

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INSILCOTE HV2000

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1 Application Area 11 kV to 400 kV AC 533 kV DC insulators of Porcelain Glass Resin material Ceramic make

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2 Dielectric Strength BDV kVmm 64 kVmm

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3 Viscosity 335 cSt

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4 Specific Gravity wet 133

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5 Specific Gravity Cured 124 at 25 deg C

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6 Permittivity 24

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7 Dielectric Constant 24

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8 Surface Resitivity 115 x 10 Ohms

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9 Volume Resitivity 229 x 10 Ohmmeter

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10 Loss Tangent 00096 at 50 Hz

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11 Dissipation Factor 00096 at 50 Hz

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12 Touch Dry 15 min

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13 Full Cure Time 7 Hrs

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14 Required Dry Thickness 03 to 05 mm

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15 Application Method Spray gun

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16 Appearance after mixing Light Blue

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17 Resistance to Marine salt fog Industrial Agricultural Coastal Desert conditions Water UV Chemical Acid Abrasion

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18 Surface Smooth Yes

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19 Hazardous UN 1866 UN 1993

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20 Coverage Area Kg 235 sq meters

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21 Shelf Life 1yr

Superior Electrical Protection

Formulated for robust dielectric strength and reliable operation, RTV Silicone Rubber Coatings help prevent electrical leakage, surface tracking, and flashover in high-voltage environments. Their seamless and flexible layer ensures dependable performance for electrical substations, transformers, bushings, and switchgear, even when exposed to demanding atmospheric conditions.


Versatile and Efficient Application

Designed for ease, these coatings can be applied by brush, spray, or dipping-accommodating various operational needs. Fast-drying properties allow equipment to be quickly returned to service. The recommended film thickness of 150-200 microns per coat ensures optimal coverage and protection, with typical coverage of 3-4 m2 per kilogram at 150 microns.


Long-Term Durability and Environmental Resistance

Engineered to meet IP 65-68 standards when applied correctly, RTV Silicone Rubber Coatings are UV-resistant and weatherproof. Their hydrophobic and anti-pollution properties prolong equipment lifespan, reducing maintenance intervals and minimizing outages due to environmental degradation. The product remains stable for 12 months when stored as directed.