• One-component RTV silicone rubber that cures to a tough high voltage insulator coating
  • RTV-SIIC flexible elastomer with excellent electrical and mechanical properties.
  • RTV-SIIC provide a highly hydrophobic surface for its entire life, thus limiting leakage current.
  • RTV-SIIC prevents the formation of wet conductive films and therefore the risk of tracking and especially flashovers
  • Resist to ageing, no peeling, no cracking


  • The room temperature vulcanizing silicone rubber coatings were used for the first time in USA over 30 years ago.
  • This method is more convenient than the hand cleaning of insulators or application of vaseline or silicone pastes. The porcelain insulators with a 0.3 – 0.6 mm thin silicone coating have similar properties to composite insulators with a thicker silicone housing.
  • A 0.3 mm thin silicone layer is able to transfer the hydrophobic properties to the pollution layer. As a result, the leakage current decreases and the flashover voltage increases.
  • Coated Insulators not affected by UV light, corona discharge, chemical contaminants, salt, extreme temperatures or corrosive environments.


  • RTV-SIIC silicone coating on insulators, is engineered to provide a highly hydrophobic surface for its entire life, thus limiting leakage current and preventing flashovers due to insulator contamination.
  • The coating is not affected by The benefits of RTV-SIIC coated Porcelain insulators are two fold – Sturdiness of Porcelain insulators and pollution performance of Silicone insulators.
  • It also reduces the O&M cost on account of frequent cleaning and washing of insulators in high pollution zones. RTV-SIIC Coating the porcelain insulator with silicone rubber is one way to improve the water repellency.
  • RTV-SIIC silicone coating is highly recommended for the coastal and sea shore areas.
  • RTV-SIIC can be applied by brushing or dipping.
  • For Spraying , Flat nozzle of 0.33 mm, 20° @ pressure output of 50 – 150 bar
  • Full cure is obtained in 8 – 12 hours after coating application depending on thickness, temperatureand humidity.


  • Proper cleaning by using water and a suitable detergentmight be sufficient.
  • Insulators that show an adhering pollution, such likecement, other mineral or chemical pollution layersshould becleaned by either “cob corn-” or carbondioxide blasting.
  • Any type of grease or fatty pollution is to be removedby using a suitable solvent like benzine or turpentine.
  • Residual contaminants should be removed bythoroughly wiping.
  • Finish the cleaning just before spraying RTV-IC withIsopropanol or an equivalent alcohol..


1Solid Content%>55
2Tack Free TimeMin15-30
3Cure ThroughHour6
5Water RepellenceDegree≥ 113°
6Volume ResistivityΩ.cm≥ 11.31×1014
7Dielectric Constant at 50 Hz3.55
8Flammability TestClassFV-0
9Tensile StrengthMpa4.24
10Tear StrengthkN/m10.2
11Dielectric StrengthkV/mm>28


  • Service life Min.15 years
  • Excellent hydrophobicity Behavior
  • Primerless adhesion
  • Very good resistance to weathering
  • Outstanding tracking resistance


Protective coating for

  • Glass High Voltage Insulators
  • Porcelain High Voltage Insulators
  • Epoxy High Voltage Insulators


  • Excellent unprimed adhesion
  • One component, ready-to-use
  • Easy to apply
  • Sprayable or paintable