Extreme High Temperature Silicone Sheet, Rolls & Uncured Compound
ElastaPro’s extreme high temperature silicone sheeting is engineered for critical sealing and gasketing applications where standard commercial silicone fails. Utilizing advanced Heat Stabilizer Technology, our high temp rubber sheet stock delivers continuous thermal resistance up to +500°F (+260°C) and intermittent peak exposure up to +600°F (+315°C) without compromising tensile strength or elastomeric flexibility.
Manufactured in Santa Fe Springs, CA, under our ISO 9001:2015 / AS9100D quality system, every batch of high temp silicone is fully traceable and shipped with a complete Certificate of Analysis (COA).
High Temperature Silicone Rubber Sheeting Specifications
Comparing high temperature gasket materials requires precise physical property data. The table below outlines typical test performance for ElastaPro’s extreme high temp silicone compounds across Shore A durometers.
| Physical Property | Test Method | ESS55HT (55 Durometer) | ESS60HT (60 Durometer) |
|---|---|---|---|
| Durometer (Shore A) | ASTM D2240 | 55 ± 5 | 60 ± 5 |
| Tensile Strength (PSI) | ASTM D412 | >750 PSI | >900 PSI |
| Elongation (%) | ASTM D412 | >150% | >125% |
| Tear Strength (ppi) | ASTM D624 Die B | >70 ppi | >75 ppi |
| Continuous Temperature Range | Internal / Heat Aging | -85°F to +500°F (-65°C to +260°C) | -85°F to +500°F (-65°C to +260°C) |
| Intermittent Max Peak Temp | Short Duration Exposure | Up to +600°F (+315°C) | Up to +600°F (+315°C) |
| Post Heat Aging (168 hrs @ 300°C) | ASTM D573 | Retains >90% Elongation | Retains >90% Elongation |
| Specification Conformance | Aerospace / Commercial | A-A-59588 Class 2a/2b, Grade 50 | A-A-59588 Class 2a/2b, Grade 60 |
Extreme High Temp Silicone Product Grades
ElastaPro supplies specification-grade HT silicone sheeting in two standard Shore A hardnesses, available in cured solid rolls, pre-cut sheets, or uncured silicone compound for further molding and calendering.
ESS55HT – 55 Durometer Extreme High Temperature
A medium-soft high temp silicone rubber engineered for applications requiring high compressibility and low closure force. Ideal for die-cut gaskets on thin-walled enclosures and thermal insulation barriers.
- Color Options: Red/Orange (Standard), Custom Colors Available
- Thickness Range: .010” to .500”
- Download: ESS55HT Technical Data Sheet (PDF)
ESS60HT – 60 Durometer Extreme High Temperature
Our standard mid-range high heat silicone sheeting balancing compression set resistance with mechanical strength. Excellent choice for high-pressure industrial oven seals, exhaust gaskets, and aerospace heat shields.
- Color Options: Red/Orange (Standard), Custom Colors Available
- Thickness Range: .010” to .500”
- Download: ESS60HT Technical Data Sheet (PDF)
Standard Silicone vs. Extreme High Temperature Silicone
While standard general-purpose silicone (VMQ) performs reliably up to approximately 400°F (200°C), prolonged exposure to temperatures above this threshold causes polymer chain scission, resulting in hardening, embrittlement, and seal failure.
Extreme high temperature silicone incorporates heat-resistant fillers and specialized antioxidant stabilizer packages. These additives prevent cross-linking breakdown during extreme thermal spikes, allowing gaskets to maintain seal recovery and flexibility in severe thermal cycling environments.
High Temperature Silicone Gasket Applications
Die-cutters, gasket fabricators, and OEM engineers utilize ElastaPro’s HT silicone sheeting across demanding manufacturing sectors:
- Aerospace & Defense: Thermal insulation wraps, engine bay fire barrier seals, ducting gaskets, and high-temp wire jackets.
- Industrial Ovens & Processing: Commercial oven door gaskets, vacuum furnace seals, heat sealing strips, and curing chamber curtains.
- Automotive & Transportation: Turbocharger crossover seals, exhaust gas recirculation (EGR) gaskets, and heat shield barriers.
- Electronics & Power Generation: High-temperature transformer insulation pads and power supply thermal interface gaskets.
Frequently Asked Questions
What temperature can high temp silicone withstand?
ElastaPro extreme high temperature silicone operates continuously from -85°F to +500°F (-65°C to +260°C) and withstands short-term intermittent peak temperatures up to +600°F (+315°C).
What is the difference between standard silicone and high temperature silicone?
Standard silicone begins to degrade, harden, and crack when continuously exposed to temperatures above 400°F (200°C). High temperature silicone uses heat stabilizer technology to preserve elasticity, tensile strength, and compression set resistance up to 600°F.
Can high temp silicone sheeting be die-cut?
Yes. ElastaPro solid high temp silicone sheeting features excellent tear strength and dimensional stability, making it easily die-cut, waterjet cut, or slit into narrow tape rolls for custom gasket fabrication.
