Products

Fiberglass Reinforced Silicone

Fiberglass-reinforced silicone combines the thermal stability and weather resistance of silicone with the added tear strength, dimensional stability, and mechanical durability of an embedded fiberglass layer. This composite structure delivers reliable performance from −80°F to +500°F, resists swelling in lubricating oils, and excels in static and dynamic sealing applications.

Specification grade fiberglass sheet from ElastaPro meets MS3320 and AMS3315. Commercial grade is also available.

Every batch is Made in USA under ElastaPro’s ISO 9001:2015 / AS9100D quality system and shipped with a complete Certificate of Analysis (COA).

Need Fiberglass Reinforced Silicone Sheet or Slit Rolls?

We supply continuous rolls, pre-cut sheets, and uncured compounds with low minimums and fast lead times.

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Fiberglass Reinforced Silicone Sheets (70 Durometer)

  • ESS70CI-RED-1564 – Specification Grade
  • ESS70CI-RED-70 – Commercial Grade

Standard Sheet Sizes & Roll Dimensions

Solid silicone sheet from ElastaPro is available in these sizes and roll dimensions.

Widths

  • Standard: 36″ (914 mm) and 48″ (1219 mm)
  • Custom: Up to 67″ (1701.8 mm) — among the widest available in the industry

Linear Lengths

  • Continuous rolls up to 300+ yards depending on thickness

Thickness Range

  • 0.005″ to 0.675″ (0.13 mm to 17.145 mm)

Cut Sheet Sizes

  • 12″ × 12″
  • 24″ × 24″
  • 36″ × 36″
  • 48″ × 48″
  • Custom dimensions available

Frequently Asked Questions

What is fiberglass reinforced silicone sheeting, and how does it work?

Fiberglass reinforced silicone (silicone fiberglass sheet) is a composite material that integrates silicone rubber with an internal fiberglass fabric or mesh substrate. The woven fiberglass acts as a structural skeleton within the silicone matrix, combining silicone’s inherent flexibility, heat resistance, and weatherability with the high tensile strength, dimensional stability, and tear resistance of fiberglass.

What are the main performance advantages of adding fiberglass to silicone rubber?

Reinforcing silicone rubber with fiberglass overcomes key limitations of unreinforced silicone by providing:

  • Enhanced Tear & Mechanical Strength: Prevents tearing and stretching under high tension, compression, or physical stress.

  • Dimensional Stability: Controls material elongation and thermal shrinkage to ensure precision tolerances in gasketing and sealing.

  • High Thermal Stability: Operates continuously across an extreme thermal window spanning from −70°F to +500°F (−57°C to +260°C).

  • Flexibility & Weatherability: Maintains environmental resistance to UV, ozone, moisture, and chemical exposure while enduring repeated mechanical flexing.

What applications and industries use fiberglass reinforced silicone composites?

Because of its unique combination of strength and thermal endurance, fiberglass reinforced silicone is specified across demanding industrial, aerospace, automotive, and electrical applications, including:

  • Thermal Management: Heat shielding, thermal insulation pads, and fire barrier seals.

  • Industrial Processing: Expansion joints, conveyor belting, and flexible ducting.

  • Electrical & Electronics: High-voltage insulation and specialized EMI shielding (when coated with conductive compounds).

  • Custom Gasketing: Precision die-cut seals for high-pressure or high-stress flange enclosures.

What is the temperature range for fiberglass reinforced silicone?

Standard fiberglass reinforced silicone sheeting operates across a continuous temperature range from −70°F to +500°F (−57°C to +260°C) depending on the specific compound formulation, fabric weight, and weave pattern. This broad operating window makes it suitable for extreme thermal cycling environments without loss of structural integrity.

How does fiberglass reinforcement affect dimensional stability and elongation?

Unreinforced solid silicone rubber can stretch or deform under high bolting torque or mechanical tension. The internal fiberglass fabric controls elongation and limits physical distortion, ensuring that gaskets and seals maintain their exact shape, thickness, and sealing force under pressure or fluctuating temperatures.

Can fiberglass reinforced silicone sheeting be custom fabricated and converted?

Yes. Fiberglass reinforced silicone composites are highly versatile and offer extensive design flexibility. They can be manufactured in varying overall thicknesses, durometers, and custom fabric weave structures. The material is fully compatible with standard fabrication methods, including die-cutting, waterjet cutting, lamination (including pressure-sensitive adhesive backing), and industrial sewing or bonding.