What should engineers consider when specifying silicone tubing?

Silicone tubing is widely used across manufacturing, medical, food processing, automotive and laboratory environments because of its flexibility, temperature resistance and long service life. However, specifying the right silicone tubing involves more than simply choosing a diameter and material grade.

Engineers need to consider operating conditions, compliance requirements, pressure performance, environmental exposure and installation factors to ensure the tubing performs reliably over time. A poorly specified tube can lead to premature wear, contamination risks, reduced efficiency or unexpected maintenance issues.

Understanding the key considerations early in the specification process can help avoid costly redesigns and ensure the tubing is suited to the intended application.

Why is silicone tubing used in industrial applications?

Silicone tubing is valued for its balance of flexibility, durability and thermal stability. Unlike some rubber and plastic materials, silicone maintains its performance across a wide temperature range while remaining flexible and resistant to cracking.

Industries commonly use silicone tubing for:

• Fluid transfer systems
• Food and beverage processing
• Pharmaceutical manufacturing
• Medical equipment
• Electrical insulation
• Laboratory environments
• Automotive cooling systems

The material also offers good resistance to UV exposure, ozone and weathering, making it suitable for both indoor and outdoor applications.

For applications requiring reliable flexibility and thermal performance, businesses often explore specialist silicone rubber tube solutions designed for industrial environments.

Why does temperature resistance matter?

Temperature range is one of the most important factors when specifying silicone tubing. Silicone performs exceptionally well in environments where conventional rubber materials may become brittle or degrade.

Many silicone tubing products can operate continuously between approximately -60°C and +200°C, although exact performance depends on the compound and application.

Engineers should consider:

Continuous operating temperature

The expected day-to-day operating temperature affects long-term durability and flexibility.

Intermittent temperature spikes

Some systems experience temporary surges above normal operating temperatures. The tubing specification should account for these peaks.

External environmental conditions

Outdoor installations or proximity to heat sources may influence tubing lifespan.

Thermal cycling

Repeated heating and cooling can place stress on materials over time.

In high-temperature applications, silicone often performs better than many thermoplastics because it retains flexibility rather than hardening or cracking.

How do pressure ratings affect tubing selection?

Pressure performance is closely linked to tubing construction, wall thickness and reinforcement requirements.

Thin-walled tubing may be suitable for low-pressure transfer applications, while pressurised systems may require reinforced silicone tubing to prevent expansion or collapse.

Engineers should assess:

• Internal operating pressure
• Vacuum performance
• Burst pressure requirements
• Pulsing or fluctuating pressure conditions
• Flow rate requirements

Wall thickness has a direct impact on pressure resistance. Increasing wall thickness can improve durability but may reduce flexibility or increase bend radius requirements.

For demanding industrial environments, balancing flexibility and pressure capability is often critical.

What compliance standards should engineers check?

Compliance is especially important in regulated industries such as food production, pharmaceuticals and healthcare.

Depending on the application, engineers may need silicone tubing that complies with:

• FDA regulations for food contact
• WRAS approval for water applications
• USP Class VI requirements
• REACH compliance
• RoHS directives

Food-grade silicone is particularly common in processing and packaging environments because it is non-toxic and resistant to contamination.

The UK Food Standards Agency provides guidance on food-safe materials used in processing environments:
Food Standards Agency

It is important to verify documentation and certification rather than assuming all silicone tubing meets the same standards.

Why are tolerances and dimensions important?

Precision matters when silicone tubing is used in engineered systems.

Incorrect tolerances can lead to:

• Poor sealing performance
• Leakage
• Inconsistent flow rates
• Difficult installation
• Premature wear

Engineers should specify:

Internal diameter (ID)

Critical for flow rate and compatibility with fittings.

Outer diameter (OD)

Important where the tubing passes through clips, housings or connectors.

Wall thickness

Affects flexibility, pressure resistance and durability.

Tolerance requirements

Tighter tolerances may be necessary in medical, laboratory or automated manufacturing systems.

Applications involving pumps or precise dosing systems often require highly consistent tubing dimensions.

What environmental conditions can affect silicone tubing?

Silicone is highly resistant to many environmental factors, but engineers should still consider the operating environment carefully.

Important considerations include:

UV and ozone exposure

Silicone performs well outdoors and resists degradation caused by sunlight and ozone.

Chemical exposure

Not all silicone compounds offer the same chemical resistance. Oils, solvents and aggressive cleaning agents may affect performance.

Abrasion

Silicone is flexible but may not always be ideal for high-abrasion environments unless additional protection is used.

Moisture and humidity

Silicone generally performs well in damp environments and maintains stability across changing humidity levels.

Sterilisation requirements

Medical and pharmaceutical applications may involve repeated steam sterilisation or cleaning cycles.

Environmental exposure can significantly affect service life, particularly where multiple stress factors combine.

Should engineers choose standard or custom silicone tubing?

Standard tubing sizes are suitable for many applications, but some systems require bespoke solutions.

Custom silicone tubing may be beneficial where:

• Non-standard diameters are required
• Specific hardness ratings are needed
• Reinforced constructions are necessary
• Colour coding improves identification
• Tight tolerances are essential
• Specialist compliance requirements apply

When evaluating bespoke manufacturing options, businesses may also explore custom extrusion capabilities and related technical support before finalising specifications.

How important is material hardness?

Silicone tubing is available in different hardness levels, typically measured using the Shore A scale.

Softer tubing may provide:

• Greater flexibility
• Easier routing
• Improved sealing around fittings

Harder tubing may offer:

• Better dimensional stability
• Improved pressure resistance
• Reduced collapse risk

Selecting the correct hardness depends on how the tubing will be installed and used within the system.

What installation factors should engineers consider?

Even high-quality silicone tubing can fail prematurely if installation requirements are overlooked.

Engineers should account for:

• Minimum bend radius
• Clamping methods
• Connector compatibility
• Movement and vibration
• Routing near heat sources
• Expansion and contraction

Sharp bends or excessive tension can shorten tubing lifespan considerably.

Proper installation planning also improves maintenance access and reduces the risk of accidental damage during servicing.

Frequently Asked Questions

Is silicone tubing suitable for food manufacturing?

Yes. Many silicone tubing products are designed for food-grade applications and comply with FDA or other food-contact standards. Always verify certification before use.

Can silicone tubing handle steam sterilisation?

Certain grades of silicone tubing can withstand repeated steam sterilisation cycles, making them suitable for medical and pharmaceutical environments.

How long does silicone tubing typically last?

Service life depends on temperature, pressure, chemical exposure and installation quality. In suitable conditions, silicone tubing can provide long-term durability.

Choosing the correct silicone tubing specification can improve reliability, reduce maintenance and support long-term system performance. Engineers should evaluate operating temperatures, pressure conditions, compliance standards, environmental exposure and dimensional tolerances before selecting a tubing solution.

Applications vary significantly between industries, so it is important to balance flexibility, durability and regulatory requirements against the specific demands of the system.

For more information about silicone tubing and bespoke rubber solutions, contact Silco Products.

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Find out more: https://siliconerubberproducts.co.uk/