Products

Medium Strength Silicone

ElastaPro provides medium strength silicone for applications that need greater strength than general purpose silicone, but less strength than high strength silicone.

  • Solid silicone sheets are easy to fabricate into gaskets and provide a superior sealing solution. They’re available in thickness from 0.10” to .500” and in widths up to 60”.
  • Uncured silicone compound arrives ready for compression molding.

Medium Strength Silicone from 30 to 80 Durometer (Shore A)

ElastaPro offers medium strength silicone in a range of durometers, a measure of hardness. Click the links below to view individual data sheets.

When comparing durometers, consider that 30 durometer silicones are generally used for applications for applications that require high flexibility. By contrast, 80 durometer materials provide greater durability and load-bearing capacity.

Material Properties of Medium Strength Silicone

The table below shows properties and test methods for each of the materials that ElastaPro offers.

Properties Test Method ESS30MS ESS35MS ESS40MS ESS50MS ESS60MS ESS70MS ESS80MS
Specific Gravity, g/cc ASTM D297 1.06 1.10 1.11 1.12 1.15 1.20 1.22
Durometer, Shore A ASTM D2240 30 ±5 35 ±5 40 ±5 50 ±5 60 ±5 70 ±5 80 ±5
Tensile Strength, psi ASTM D412 750 750 1000 1000 1100 1200 1200
Elongation, % ASTM D412 900 875 800 600 600 400 300
Tear, ppi Die “B” ASTM D624 130 140 140 150 175 200 175

When to Use Medium Strength Solid Silicone Sheeting

Medium strength silicone sheeting is a versatile elastomer material designed to balance mechanical performance with flexibility, thermal stability, and chemical resistance. It is commonly used when standard silicone lacks the required durability, but high strength silicone is not necessary or cost-effective. This middle-ground option provides adequate tensile strength, tear resistance, and elongation for many demanding environments without the added stiffness or higher cost of high strength formulations.

Industrial Equipment

One of the most common applications for medium strength silicone sheeting is in gasket and sealing products for industrial equipment. In these applications, the material must maintain its shape and elasticity while forming a reliable seal under compression. Medium strength silicone works well in sealing enclosures against dust, moisture, or contaminants, especially in environments where the seal may be repeatedly compressed and released. It offers long service life and consistent performance even when exposed to temperatures ranging from approximately -60°C to +200°C.

Medical Manufacturing and Food Processing

Medical and food processing applications also benefit from medium strength silicone sheeting, particularly when FDA or USP Class VI compliance is needed. The material resists bacterial growth, is chemically inert, and can be sterilized without degradation. It can be used for pump diaphragms, transfer tubing, and cushioning components in sensitive environments.

Electronics and Automotive

In electronics and automotive industries, medium strength silicone serves as insulation padding, vibration dampening material, or EMI shielding when combined with conductive additives. It has excellent dielectric properties and maintains its integrity under continuous thermal cycling, making it ideal for environments where moderate mechanical stress is combined with high heat or exposure to ozone and UV.

Consumer Products and General Manufacturing

Medium strength silicone sheeting is also used in consumer products and general manufacturing, such as protective pads, weather stripping, and vibration-isolating components. It offers better durability than soft silicone while remaining easier to handle and install than high strength grades. This makes it especially valuable for maintenance teams and OEMs seeking a reliable, general-purpose elastomer with a wide performance envelope.

Ask ElastaPro for Medium Strength Silicone Materials

Select medium strength silicone sheeting when an application requires better physical properties than general purpose silicone but does not demand the extreme tensile or tear strength of high strength silicone. It offers a cost-effective and reliable solution for sealing, insulating, or cushioning across a broad spectrum of industries.