Medium Strength Grade Silicone Sheeting
Medium Strength Grade Silicone Sheeting is a solid silicone elastomer engineered to deliver higher tensile strength, tear resistance, and elongation than general-purpose silicone grades. Available from 25 to 85 Shore A durometer, it provides a superior gasket and sealing solution across a wide hardness range with an operating temperature of -80°F to +450°F (500°F intermittent). The material is easily die-cut and available in thicknesses from .010″ to .500″ and widths up to 60″.
Key Properties
- Durometer, Shore “A”: 30 ±5 to 80 ±5 (seven grades) — ASTM D2240
- Tensile Strength, psi: 750–1200 (varies by grade) — ASTM D412
- Elongation, %: 300–900 (varies by grade) — ASTM D412
- Tear, ppi Die “B”: 130–200 (varies by grade) — ASTM D624
- Specific Gravity, g/cc: 1.06–1.22 (varies by grade) — ASTM D297
- Service Temperature: -80°F to +450°F (500°F intermittent)
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- Specifications
- Applications
- General Info
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Physical Properties
| Property | Test Method | 30 Duro | 35 Duro | 40 Duro | 50 Duro | 60 Duro | 70 Duro | 80 Duro |
| 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 |
- Industrial seals and gaskets requiring higher tensile and tear strength than general-purpose silicone grades
- General-purpose die-cut gasketing across a wide durometer range from soft conformable to firm load-bearing grades
- Electrical insulation components in environments requiring UV and ozone stability
- UV- and ozone-exposed outdoor sealing in wide-temperature service
- High-elongation conformable sealing applications where gasket conformability to irregular surfaces is critical
Common industries: Industrial manufacturing, electrical and electronics, HVAC, construction, outdoor equipment.
Medium Strength Grade Silicone Sheeting is a solid silicone elastomer engineered to bridge the performance gap between standard general-purpose silicone and high-strength specialty grades. The product line spans seven durometer grades from 30 to 80 Shore A, covering the full range of soft conformable to firm load-bearing sealing requirements in a single qualified product family.
Compared to general-purpose silicone, Medium Strength Grade Silicone Sheeting delivers higher tensile strength (up to 1,200 psi at 70 and 80 durometer), higher tear resistance (up to 200 ppi Die “B” at 70 durometer), and higher elongation at the softer durometer grades (900% at 30 Shore A). The material is easily die-cut and available in thicknesses from .010″ to .500″ and widths up to 60″.
Medium Strength Grade Silicone Sheeting is formulated with high-quality raw materials and provides UV and ozone resistance along with excellent electrical insulation properties. Specific gravity ranges from 1.06 at 30 Shore A to 1.22 at 80 Shore A, reflecting the material’s consistent low-density construction across the durometer range. With an operating temperature of -80°F to +450°F (500°F intermittent), the product line supports general industrial sealing, outdoor applications, and electrical insulation use across a broad environmental range.
What differentiates Medium Strength Grade Silicone Sheeting from general-purpose solid silicone sheeting?
Medium Strength Grade Silicone Sheeting is specifically formulated to deliver higher tensile strength, higher tear resistance, and higher elongation than standard general-purpose silicone grades across its full durometer range. At equivalent durometers, Medium Strength Grade Silicone Sheeting outperforms general-purpose silicone on all three primary mechanical properties — making it the appropriate selection when the sealing application imposes mechanical demands that general-purpose material cannot reliably meet.
Why does tensile strength matter in solid silicone gasket selection?
Tensile strength establishes the material's resistance to being pulled apart under mechanical load — relevant in dynamic sealing applications, bolted gasket joints subject to uneven clamping, or die-cut parts that must survive handling and installation without tearing. Medium Strength Grade Silicone Sheeting's tensile range of 750–1,200 psi (depending on durometer) provides design engineers with meaningful mechanical margin over general-purpose silicone grades while remaining within the silicone elastomer material family.
What is the operating temperature range for Medium Strength Grade Silicone Sheeting?
80°F to +450°F (500°F intermittent), as listed on the TDS.
Is Medium Strength Grade Silicone Sheeting suitable for regulated or specification-driven applications?
No compliance standards are listed on the manufacturer's TDS for Medium Strength Grade Silicone Sheeting. For applications requiring UL, AMS, FDA, or other specification compliance, contact H-O Products to discuss appropriate alternative grades.
How should Medium Strength Grade Silicone Sheeting be specified?
Specify Medium Strength Grade Silicone Sheeting, durometer (30, 35, 40, 50, 60, 70, or 80 Shore A), thickness, dimensional tolerances, and finished format.
