High-Temperature Silicone Tubing
Silicone tubing and hose with thermal stability superior to standard formulations. Continuous service up to +300 °C with peaks of +315 °C. Purpose-built formulations for industrial ovens, autoclaves, vulcanisation equipment and hot-process machinery.
Standard VMQ silicones (Series 2, Series 12) retain their mechanical properties up to +200 °C in continuous service. Above that temperature, the polymer chain degrades progressively: the tube hardens, loses elasticity, cracks and ultimately fails. When the working temperature exceeds +200 °C, a formulation engineered specifically for prolonged thermal stability is required.
Series 9 is the reference formulation for high temperature: continuous service at +300 °C and peaks of +315 °C, with peroxide cure and FDA certification. Where mechanical stresses accompany the heat (frequent assembly/disassembly, vibration, tension), Series 20 combines high temperature (+270 °C) with high tear strength (up to 36 kN/m). For applications where the tube operates hot with friction or surface abrasion, Series 7 offers combined tear and abrasion resistance up to +230 °C. For requirements between +200 °C and +300 °C, Series 2 and 12 can also be extended to +300 °C / +315 °C by incorporating a thermal-stabilisation additive.
Inside diameters from 2 mm to 100 mm, with wall thicknesses from 1 to 8 mm. Tolerances to ISO 3302-1 E1/E2. High-temperature formulations require oven post-cure to achieve their nominal thermal stability. Manufactured under ISO 9001 with full batch traceability.
Do you need native high temperature or is an HT additive sufficient?
If the working temperature is consistently above +230 °C, Series 9 is the safe choice: its formulation is designed from the ground up for prolonged thermal stability. If the temperature sits between +200 °C and +250 °C and only occasionally exceeds that range, it may be sufficient to add a thermal-stabilisation additive to Series 2 or 12, retaining their food-contact or medical certifications. If mechanical stresses accompany the heat, Series 20 is the best combination.
Which high-temperature tube do you need?
Locate your temperature range and additional requirement to determine the recommended formulation. For specific combinations, consult availability.
| Requisito | Formulación | Serie | Proceso |
|---|---|---|---|
| Maximum temperature (+300 °C continuous) | VMQ HT native | Series 9 | Extrusion |
| High temperature + high tear (+270 °C) | VMQ HT + HD | Series 20 | Extrusion |
| Temperature + abrasion (+230 °C) | VMQ HD + abrasion | Series 7 | Extrusion |
| HT with FDA/CE food-contact certification | VMQ Platinum + HT additive | Series 12 + HT | Extrusion |
| HT with USP VI medical certification | VMQ Platinum + HT additive | Series 12 + HT | Extrusion |
| Economical HT (+200–250 °C) | VMQ Peroxide + HT additive | Series 2 + HT | Extrusion |
| Pressure / vacuum in hot service | VMQ HT + reinforcement | Series 9 | Multi-layer extrusion |
| Large bore in hot service (> 50 mm) | VMQ HT native | Series 9 | Extrusion to drawing |
High-temperature tube types by construction
Plain single-layer high-temperature tube
Circular cross-section with a homogeneous wall in a high-temperature formulation. This is the standard construction for conveying hot gases, process air, oven ventilation and auxiliary circuits on hot-running machinery. Smooth bore to minimise residue build-up.
Tube reinforced with textile or metal braid
High-temperature silicone tube with embedded reinforcement that provides internal-pressure resistance and prevents vacuum collapse. Polyester or aramid textile braid (according to temperature) or stainless-steel wire braid enables operation under pressure in high-temperature environments without permanent deformation.
High-temperature + high-tear tube
Series 20 formulation combining thermal stability up to +270 °C with high tear strength (up to 36 kN/m). Designed for situations where the tube operates hot and is also subject to mechanical stress during assembly, operation or maintenance. Abrasion resistance superior to standard formulations.
Standard tube with thermal-stabilisation additive
Series 2 (peroxide) and Series 12 (platinum) formulations can be extended to +300 °C continuous and +315 °C peaks by incorporating a thermal-stabilisation additive. This option allows the base-series certifications (food-contact, medical) to be retained while extending the thermal range, provided the additive is compatible with the required certifications.
Dimensional ranges by high-temperature application
The higher the service temperature, the more important the wall thickness: thermal degradation advances from the outer surface inward, so a generous wall thickness extends service life. The diameters shown are the most common ranges; for special dimensions, we manufacture to drawing with new tooling (lead time 2–4 weeks).
Sensor and cable protection
ID 2 to 8 mmSmall-bore tubes for protecting thermocouple wires, temperature probes, fibre optics and instrumentation cabling in high-temperature zones. Minimum wall thickness of 1 mm to ensure thermal and mechanical protection of the conductor.
- Inside diameter
- 2 to 8 mm
- Wall thickness
- 1 to 2 mm
- Typical supply form
- Coils of 25 or 50 m
Formulations: Series 9 (+300 °C), Series 12 with HT additive (+300 °C), Series 2 with HT additive (+300 °C).
Machinery auxiliary circuits
ID 8 to 20 mmStandard range for hot-air circuits, auxiliary equipment ventilation, oven vacuum lines and connections between machinery components operating at elevated temperature. Compatible with metal fittings and industrial clamps.
- Inside diameter
- 8 to 20 mm
- Wall thickness
- 2 to 4 mm
- Typical supply form
- Coils of 10 or 25 m
Formulations: Series 9 (+300 °C), Series 20 (+270 °C with high tear), textile-reinforced (pressure/vacuum).
Hot-process fluid conveyance
ID 20 to 50 mmBore sizes for conveying air, low-pressure steam or process fluids at elevated temperature. Wall thicknesses of 3 to 6 mm to combine thermal insulation with flexibility. Reinforced tubes with braid are recommended for applications with internal pressure.
- Inside diameter
- 20 to 50 mm
- Wall thickness
- 3 to 6 mm
- Typical supply form
- Coils of 10 m or cut lengths
Formulations: Series 9 (+300 °C), Series 20 (+270 °C HD), textile or metal reinforced.
Large-bore sleeves and ducts
ID 50 to 100 mmLarge-diameter tubes for oven connection sleeves, ventilation ducts in hot zones and flexible connections on large-format equipment. Manufactured to drawing with dedicated tooling. Metal reinforcement available for vacuum or pressure applications.
- Inside diameter
- 50 to 100 mm
- Wall thickness
- 4 to 8 mm
- Typical supply form
- Cut to length
Formulations: Series 9 (+300 °C), metal-reinforced (pressure/vacuum).
At temperatures above +250 °C, it is recommended to increase wall thickness by 20–30 % relative to the same application at ambient temperature, to compensate for progressive thermal degradation and extend service life. Tolerances: ISO 3302-1 class E1 (standard) or E2 to specification.
Which formulation does your high-temperature tube need?
VMQ maximum temperature — HT reference (Series 9)
The formulation with the highest thermal stability in the catalogue. Continuous service at +300 °C and peaks of +315 °C. Peroxide-cured. Designed specifically for applications where temperature is the dominant factor and high tear strength is not required.
Industrial ovens, vulcanisation equipment, high-temperature autoclaves, dry-heat sterilisation machinery, cable protection in engine zones.
| Property | EQ940 | EQ950 | EQ960 | EQ970 |
|---|---|---|---|---|
| Hardness (±5 Shore A) | 40 | 50 | 60 | 68 |
| Tensile strength (MPa min) | 6 | 6 | 8 | 8 |
| Elongation (% min) | 400 | 350 | 300 | 300 |
| Tear strength (kN/m min) | 12 | 12 | 17 | 17 |
| Density (g/cm3) | 1.11 | 1.16 | 1.18 | 1.20 |
Temperature: –60 to +300 °C continuous, peaks to +315 °C. Certification: FDA. Peroxide-cured — post-cure required. 4 hardnesses available from 40 to 68 Shore A.
VMQ high temperature + high tear (Series 20)
Combines thermal stability up to +270 °C with high tear strength (up to 36 kN/m) and good abrasion resistance. The choice when the tube operates hot and is also subject to mechanical stress: frequent assembly onto fittings, vibration, tension or surface abrasion.
Machinery with hot format changes, connections subject to vibration at high temperature, circuits under simultaneous mechanical and thermal stress.
| Property | EQ2045 | EQ2060 | EQ2070 |
|---|---|---|---|
| Hardness (±5 Shore A) | 45 | 60 | 70 |
| Tensile strength (MPa min) | 8 | 8 | 7 |
| Elongation (% min) | 550 | 400 | 400 |
| Tear strength (kN/m min) | 30 | 34 | 36 |
| Density (g/cm3) | 1.12 | 1.16 | 1.20 |
Temperature: –60 to +270 °C. Certification: FDA. Peroxide-cured. The 36 kN/m tear strength at 70 Shore A is exceptional for a high-temperature formulation — double the Series 9 values at that hardness.
VMQ high tear + abrasion (Series 7)
Formulation with combined tear and surface-abrasion resistance. Service temperature up to +230 °C. Indicated where the tube operates hot with mechanical friction or contact with abrasive surfaces.
Environments with friction at elevated temperature, tubes routed through hot guides or pulleys, mechanical protection in zones with abrasive particles and heat.
| Property | EQ760 | EQ765 | MQ770 |
|---|---|---|---|
| Hardness (±5 Shore A) | 60 | 60 | 60 |
| Tensile strength (MPa min) | 6.9 | 7 | 8 |
| Elongation (% min) | 400 | 400 | 400 |
| Tear strength (kN/m min) | 30 | 35 | 35 |
| Density (g/cm3) | 1.19 | 1.19 | 1.19 |
Temperature: –60 to +230 °C. Certification: FDA. Peroxide-cured. Available in 60 Shore A only. EQ760 extrusion only; MQ770 moulding only. For temperatures above +230 °C, consider Series 20 or Series 9.
The formulation with the highest thermal stability in the catalogue. Continuous service at +300 °C and peaks of +315 °C. Peroxide-cured. Designed specifically for applications where temperature is the dominant factor and high tear strength is not required.
Industrial ovens, vulcanisation equipment, high-temperature autoclaves, dry-heat sterilisation machinery, cable protection in engine zones.
| Property | EQ940 | EQ950 | EQ960 | EQ970 |
|---|---|---|---|---|
| Hardness (±5 Shore A) | 40 | 50 | 60 | 68 |
| Tensile strength (MPa min) | 6 | 6 | 8 | 8 |
| Elongation (% min) | 400 | 350 | 300 | 300 |
| Tear strength (kN/m min) | 12 | 12 | 17 | 17 |
| Density (g/cm3) | 1.11 | 1.16 | 1.18 | 1.20 |
Temperature: –60 to +300 °C continuous, peaks to +315 °C. Certification: FDA. Peroxide-cured — post-cure required. 4 hardnesses available from 40 to 68 Shore A.
Combines thermal stability up to +270 °C with high tear strength (up to 36 kN/m) and good abrasion resistance. The choice when the tube operates hot and is also subject to mechanical stress: frequent assembly onto fittings, vibration, tension or surface abrasion.
Machinery with hot format changes, connections subject to vibration at high temperature, circuits under simultaneous mechanical and thermal stress.
| Property | EQ2045 | EQ2060 | EQ2070 |
|---|---|---|---|
| Hardness (±5 Shore A) | 45 | 60 | 70 |
| Tensile strength (MPa min) | 8 | 8 | 7 |
| Elongation (% min) | 550 | 400 | 400 |
| Tear strength (kN/m min) | 30 | 34 | 36 |
| Density (g/cm3) | 1.12 | 1.16 | 1.20 |
Temperature: –60 to +270 °C. Certification: FDA. Peroxide-cured. The 36 kN/m tear strength at 70 Shore A is exceptional for a high-temperature formulation — double the Series 9 values at that hardness.
Formulation with combined tear and surface-abrasion resistance. Service temperature up to +230 °C. Indicated where the tube operates hot with mechanical friction or contact with abrasive surfaces.
Environments with friction at elevated temperature, tubes routed through hot guides or pulleys, mechanical protection in zones with abrasive particles and heat.
| Property | EQ760 | EQ765 | MQ770 |
|---|---|---|---|
| Hardness (±5 Shore A) | 60 | 60 | 60 |
| Tensile strength (MPa min) | 6.9 | 7 | 8 |
| Elongation (% min) | 400 | 400 | 400 |
| Tear strength (kN/m min) | 30 | 35 | 35 |
| Density (g/cm3) | 1.19 | 1.19 | 1.19 |
Temperature: –60 to +230 °C. Certification: FDA. Peroxide-cured. Available in 60 Shore A only. EQ760 extrusion only; MQ770 moulding only. For temperatures above +230 °C, consider Series 20 or Series 9.
From compound to validated high-temperature tube
High-temperature tube extrusion requires an extended oven post-cure for the formulation to achieve its nominal thermal stability. Without proper post-cure, mechanical properties at high temperature degrade prematurely.
Application sectors
Industrial
High-temperature tubing for ovens, vulcanisers, autoclaves and industrial process machinery.
Food & Beverage
Tubing with HT additive for high-temperature sterilisation equipment and food-industry autoclaves with FDA certification.
Medical
Silicone tubing with HT additive for autoclaves and sterilisation equipment in hospital and pharmaceutical environments.
Pharmaceutical
High-temperature resistant tubing for sterilisation processes, bioreactors and pharmaceutical production equipment.
Related products
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General-purpose silicone tubing for industrial applications up to +200 °C.
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Custom profiles
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Silicone hose sleeves
Shaped silicone sleeves for engine, turbo and industrial circuit connections.
Need silicone tubing for high-temperature service?
Tell us the continuous service temperature and peak temperature, the required bore size, the fluid being conveyed and whether there are additional mechanical stresses (pressure, vibration, abrasion). Our technical team will confirm the most suitable formulation and estimated service life for your application.
Request quotation