High-Voltage Composite Insulators

High-voltage composite insulator solutions

Dow SILASTIC™ High-voltage solutions have been providing more than 4 decades of reliability and consistency to the Energy market. Delivering excellent performance for high-voltage applications in all climates and harsh conditions, such as coastal, desert and industrial environments. SILASTIC™ high-voltage LSR and HCR solutions are optimized for various processing methods to produce surge arrestors, line posts, suspension, long-rod, and hollow-core insulators.

Insulators fabricated from top-quality, innovative high voltage silicone elastomers:

Excellent dielectric properties

Prevents polymer breakdown in various overvoltage types, including lightning and switching impulses.

High tracking resistance

Resists formation of conducting pathways along silicone surface and reduces arcing.

Low viscosity

Liquid silicone enables low-pressure molding processes and faster cavity filling.

Weather resistant

Sustained hydrophobicity, UV stability, low flammability ensures protection against outside elements.

Mold release

Easy to handle, allowing clean ready-made devices.

Reliable

Resilient silicone rubber stands up to environmental conditions, physical stresses, and vandalism.

SILASTIC™ Silicone Elastomers

How can our silicone elastomers help you to power the planet?

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Liquid Silicone Rubber (LSR)

SILASTIC ™ liquid silicone rubber (LSR) enables quicker mold filling and faster curing, resulting in shorter production cycles. LSR’s low viscosity allows for highly automated injection processes, reducing labor costs and increasing product efficiency. LSR can be molded into complex geometries and intricate designs, allowing for innovative product development. Our SILASTIC™ HV LSR products are commonly used for injection molding, hollow-core insulators, electrical stress control, cable end terminations, and surge protection.

LSR products

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LSR for Insulators, Hollowcore, Cable Accessories, and Electrical Stress Control
Typical Applications	Cold shrink Terminations Cable accessories	Cold shrink Terminations Cable accessories	Cold shrink Electrical stress control Electrically conductive moldings	Cold shrink Electrical stress control Electrically conductive moldings	Insulators Hollowcore insulators Cable end terminations
Key Features & Benefits	Injection moldable, superior electrical properties and excellent tracking resistance, Sustained hydrophobicity and resilient across wide temperature range
Key Features & Benefits	Injection moldable High tear strength High elongation	Injection moldable High tear strength High elongation	Fast cure Low volume resistivity High elongation	Fast cure Low volume resistivity High tear strength	Low viscosity Low temperature cure
Product	HV 1510-40	HV 1519-40	HV 1523-30	HV 1523-40	HV 1551-55P
Appearance	Translucent/Gray	Translucent/Gray	Black	Black	Translucent/Gray
Viscosity (Y= 10.0s^-1) (Pa.s)	320^[1]	240^[1]	340^[1]	240^[1]	60^[1]
Hardness Shore A	38^[2]	41^[2]	35^[3]	45^[2]	42^[2]
Tensile Strength (MPa)	9.0^[4]	9.0^[4]	5.6^[5]	6.8^[4]	6.8^[4]
Elongation at Break (%)	800^[4]	600^[4]	650^[5]	590^[4]	472^[4]
Tear Resistance (kN/m)	35^[6]	35^[6]	30^[6]	34^[6]	31^[6]
Volume Resistivity (Ohm.cm)	5.0 × 10^15[7]	3.0 × 10^15[7]	80^[7]	30^[7]	1.0 × 10^15[7]
Dielectric Strength (kV/mm)	26^[8]	24^[8]	—	—	30^[8]
Tracking & Erosion Resistance	1A4.5^[9]	1A3.5^[9]	—	—	1A4.5^[9]

^{[1] CTM 1094 | [2] ASTM D2204 | [3] DIN 53504 | [4] ASTM D412 | [5] DIN 53504 | [6] ASTM D624B | [7] IEC 60093 | [8] IEC 60432 | [9] IEC 60587 | ASTM: American Society for Testing and Materials. CTM: Dow Corporate Test Methods, available upon request. | IEC: International Electrotechnical Commission. | — Indicates data not available and/or not applicable. | Cure conditions (for most cases): 10 min @ 120°C + 4 hr post cure @ 150-200°C. | *Cure conditions can vary depending on application. | Certain products are region-specific; please contact us for more details.}

High-Consistency Rubber (HCR)

SILASTIC ™ high consistency rubber (HCR) products have established performance and superior mechanical properties, including high tear strength and tensile strength. HCR is ideal for extrusion and retains its extruded profile in the uncured state. Our SILASTIC™ HCR products are easily customized for specific high voltage applications through the addition of various fillers and additives to enhance electrical properties.

HCR products

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HCR for Insulators or Surge Arrestors
Typical Applications	Surge arrestors, high-voltage insulators and weather shed insulators
Key Features & Benefits	Superior electrical properties, excellent tracking resistance, sustained hydrophobicity and resilient across wide temperature range
Key Features & Benefits	65 Shore A hardness Mold release	65 Shore A hardness Mold release Low temperature cure	65 Shore A hardness Fast addition curing system	70 Shore A, Extrudable Hollow core insulators Fast addition curing system	80 Shore A hardness Fast addition curing system
Product	HV 1660-65	HCM 65-1344	HV 1760-65	HCE 70-4313	HV 1760-80
Appearance	Gray, Light gray	Gray, Light gray	Gray, Light gray	Light Gray	Dark Gray, Light Gray
Hardness Shore A	65^[1]	65^[1]	65^[1]	70^[1]	80^[1]
Tensile Strength (MPa)	5.5^[2]	5.8^[2]	4.2^[2]	6.0^[2]	5.8^[2]
Elongation at Break (%)	225^[2]	240^[2]	406^[2]	305^[2]	215^[2]
Tear Resistance (kN/m)	14^[3]	12^[3]	20^[3]	24^[3]	20^[3]
Volume Resistivity (Ohm.cm)	2.0 × 10^14[4]	2.0 × 10^15[4]	4.0 × 10^14[4]	5.3 × 10^14[4]	5.4 × 10^14[4]
Dielectric Strength (kV/mm)	17.3^[5]	19.0^[5]	16.6^[5]	24.0^[5]	16.9^[5]
Tracking & Erosion Resistance	1A4.5^[6]	1A4.5^[6]	1A4.5^[6]	1A4.5^[6]	1A4.5^[6]

^{[1] ASTM D2240 | [2] ASTM D412 | [3] ASTM D624B | [4] IEC 60093 | [5] IEC 60432 | [6] IEC 60587 | ASTM: American Society for Testing and Materials. CTM: Dow Corporate Test Methods, available upon request. | IEC: International Electrotechnical Commission. | — Indicates data not available and/or not applicable. | Typical cure conditions: 10 min @ 170°C to 177°C. | Certain products are region-specific; please contact us for more details.}

Meeting your needs

SILASTIC ™ silicone rubber products from Dow can be tailored to specific performance and application requirements and are globally manufactured to consistent quality and performance standards.

High-quality silicone rubber bases, high consistency rubber compounds and liquid silicone rubbers offered at competitive, market-driven prices
Customized compounding options that help you save money, time and labor
Reliability, proven performance and global product availability
Flexible buying options that let you adjust to changing needs for value, security and convenience

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