Peristaltic Pump Tubing Selection: Material Properties, Performance Factors, and How to Get It Right

Peristaltic pumps are deceptively simple machines. A rotor compresses a flexible tube against a housing, and fluid moves forward. No valves, no seals, no fluid contact with the pump mechanism. In theory, the only consumable is the tubing.

In practice, the tubing is everything.

The wrong tubing choice — wrong material, wrong hardness, wrong dimensions, wrong curing chemistry — will cause flow rate drift, premature tube failure, failed biocompatibility testing, or all three simultaneously. In pharmaceutical manufacturing, IV drug delivery, or clinical diagnostics, any of these failures carries serious consequences: batch rejection, patient safety incidents, or regulatory action.

This guide gives you the complete technical framework for selecting peristaltic pump tubing — covering material science, mechanical performance, dimensional requirements, fluid compatibility, and the qualification process that separates a reliable supply from an expensive mistake.

How Peristaltic Pumps Work — And Why Tubing Properties Are Critical

Understanding tubing selection starts with understanding what the pump actually does to the tubing.

In a peristaltic pump, the rotor rollers or shoes compress the tubing to approximately 50–60% of its original inner diameter with each pass. The tubing must then fully recover to its original geometry before the next compression cycle. This compression-recovery cycle repeats continuously — in high-speed laboratory pumps, this can mean hundreds of thousands of cycles per day.

The tubing's ability to recover fully and consistently after each compression determines:

• Flow accuracy — incomplete recovery means less fluid displaced per cycle, causing flow rate to drift downward over time

• Tube service life — fatigue failure (cracking, spallation, wall thinning) occurs when the tubing cannot elastically absorb the repeated deformation

• Particle generation — degraded tubing sheds microscopic particles into the fluid stream — a critical concern in pharmaceutical and clinical applications

• Pump calibration stability — a pump calibrated at installation will drift out of calibration as the tubing fatigues

Every material property discussed in this guide connects directly to one or more of these performance outcomes.

Material Options for Peristaltic Pump Tubing

Several elastomeric materials are used in peristaltic pump tubing. Each has a distinct performance profile:

Why Platinum-Cured Silicone Dominates Medical and Pharmaceutical Peristaltic Applications

For any peristaltic pump application involving patient contact, pharmaceutical fluid transfer, or regulated bioprocessing, platinum-cured silicone is the material of choice — and for good reason:

1. Superior compression set recovery — the defining performance requirement for peristaltic tubing

2. Zero extractables from curing by-products — critical for drug-contact and patient-contact fluid paths

3. Broad temperature range — compatible with autoclave sterilization (121°C / 134°C) and cryogenic storage

4. Consistent lot-to-lot biocompatibility — no variable residual peroxide decomposition products

5. Regulatory acceptance — USP Class VI and ISO 10993 compliance is standard, not optional

For a detailed comparison of platinum-cured vs. peroxide-cured silicone chemistry and why it matters for biocompatibility, see: Platinum-Cured vs. Peroxide-Cured Silicone: Which Should You Choose?

The Five Critical Material Properties for Peristaltic Pump Tubing

1. Compression Set — The Most Important Property

Compression set measures how much permanent deformation a material retains after being compressed for a defined time and temperature. It is expressed as a percentage:

Compression Set (%)=t0−trt0−ts×100Compression Set (%)=t0−tst0−tr×100

Where:

• t0t0 = original thickness

• trtr = thickness after recovery

• tsts = compressed thickness

A compression set of 0% means perfect recovery. A higher percentage means more permanent deformation.

For peristaltic pump tubing, the practical implication is direct:

Standard test method: ASTM D395 Method B (compressed 25% for 22 hours at 70°C or 100°C).

✅ Chensheng Medical platinum-cured silicone pump tubing achieves compression set ≤ 8% (ASTM D395, 22h/70°C) — consistently across production lots.

2. Shore A Hardness — Balancing Pumpability and Durability

Shore A hardness determines how much force the pump rotor must exert to compress the tubing, and how the tubing responds to repeated compression.

Too soft (Shore A < 40):

• Tubing collapses too easily — rollers may over-compress, causing wall-to-wall contact and flow interruption

• Reduced fatigue life — soft tubing deforms more per cycle, accelerating wear

• Dimensional instability — soft tubing is harder to extrude to tight tolerances

Too hard (Shore A > 70):

• Pump motor must work harder — increased energy consumption and motor wear

• Higher contact stress at roller/tubing interface — accelerated surface fatigue

• Reduced flexibility — tubing may kink in pump head during installation

Optimal range for most peristaltic pump applications: Shore A 50–65

Your pump manufacturer's documentation will typically specify the recommended tubing hardness range for their pump head design. Always verify compatibility before substituting tubing.

3. Tensile Strength and Elongation at Break

These properties determine the tubing's resistance to mechanical failure under the stresses of peristaltic pumping:

• Tensile strength (minimum 7 MPa for medical pump tubing) — resistance to tearing at the roller contact zone

• Elongation at break (minimum 400%) — ability to deform without cracking; higher elongation correlates with better fatigue life

For platinum-cured medical silicone pump tubing, typical values are:

• Tensile strength: 8–11 MPa

• Elongation at break: 500–650%

These values should be confirmed on the material's Technical Data Sheet (TDS) and verified on lot-specific Certificates of Analysis (CoA).

4. Tear Resistance

Tear resistance (measured per ASTM D624 or ISO 34) is particularly important for pump tubing because the roller contact creates stress concentrations at the tubing wall. Low tear resistance leads to:

• Crack initiation at the inner wall surface (the highest-stress zone)

• Progressive crack propagation through the wall — leading to tubing failure and fluid leakage

• Particle generation from torn inner wall material

Minimum acceptable tear resistance for medical pump tubing: 25 kN/m (ASTM D624 Die C)

Chensheng Medical platinum-cured pump tubing achieves ≥ 30 kN/m — providing a meaningful safety margin above the minimum threshold.

5. Surface Finish and Inner Wall Quality

The inner wall surface of peristaltic pump tubing is in direct contact with the fluid being pumped. Surface quality affects:

• Particle generation — rough inner walls shed particles into the fluid stream

• Biofilm formation — surface irregularities provide attachment sites for microorganisms

• Extractables profile — surface area affects the rate of leachable migration into the fluid

• Cleanability — smooth surfaces are easier to flush and clean between uses

For pharmaceutical and medical applications, inner wall surface roughness (Ra) should be ≤ 1.6 μm. Chensheng Medical's extrusion process consistently achieves Ra ≤ 0.8 μm on medical pump tubing inner walls.

Dimensional Requirements and Tolerances

The Three Critical Dimensions

Every peristaltic pump tubing specification is defined by three dimensions:

• Inner Diameter (ID) — determines flow rate per revolution; directly affects pump calibration

• Outer Diameter (OD) — determines fit in the pump head; affects compression ratio

• Wall Thickness (WT) — determines compression set behavior, fatigue life, and pressure rating

The relationship between these dimensions is:

Wall Thickness=OD−ID2Wall Thickness=2OD−ID

Why Dimensional Tolerance Is Non-Negotiable

In a peristaltic pump, flow rate is directly proportional to the internal cross-sectional area of the tubing. A small variation in ID produces a proportional variation in flow rate:

For pharmaceutical dosing applications where ±2% accuracy is required, dimensional tolerance on the tubing ID is a primary accuracy driver — not just a quality metric.

Chensheng Medical Dimensional Tolerance Standards

Precision tolerance (±0.05mm) is standard for all medical and pharmaceutical pump tubing orders. Achieving this tolerance requires:

• Precision-ground extrusion dies with controlled land length

• Closed-loop dimensional monitoring during extrusion (laser micrometer)

• Temperature-controlled extrusion environment

• Controlled post-extrusion cooling to prevent dimensional relaxation

Standard Pump Tubing Size Compatibility

Chensheng Medical produces pump tubing compatible with all major peristaltic pump platforms, including:

If your pump is not listed, contact our applications engineering team with the pump model and required tubing size — we will confirm compatibility or develop a matched specification.

Fluid Compatibility Considerations

Platinum-cured silicone has excellent compatibility with a wide range of fluids encountered in medical and pharmaceutical peristaltic pump applications:

For pharmaceutical applications: Always conduct an extractables and leachables (E&L) compatibility study for your specific drug formulation and tubing lot before clinical or commercial use. Even with platinum-cured silicone, certain APIs may interact with silicone extractables at trace levels. For guidance on the certification framework governing extractables, see: USP Class VI, ISO 10993, and FDA 21 CFR 177.2600: Which Medical Silicone Certification Do You Actually Need?

Sterilization Compatibility

Many peristaltic pump applications in medical and pharmaceutical settings require sterile tubing or tubing that can be sterilized in-line or between uses.

Important: Sterilization validation should be performed on your specific tubing lot and sterilization protocol. Dimensional and mechanical property verification post-sterilization is recommended as part of your qualification protocol.

Tube Life and Failure Modes: What to Expect and How to Extend It

Typical Tube Life

Peristaltic pump tubing is a consumable — it will eventually fatigue and require replacement. Typical service life depends on:

• Pump speed (RPM) — higher speed = more compression cycles per unit time = shorter tube life

• Occlusion setting — tighter occlusion (more compression) accelerates fatigue

• Tubing hardness — softer tubing deforms more per cycle; harder tubing generates more contact stress

• Fluid temperature — elevated temperature accelerates silicone fatigue

• Tubing quality — dimensional consistency and material quality are the primary determinants of life variability

As a general benchmark for platinum-cured silicone pump tubing:

These are indicative ranges. Actual life depends heavily on pump model, occlusion setting, and operating conditions. We recommend establishing tube life empirically under your actual operating conditions as part of your qualification protocol.

Common Failure Modes and Root Causes

If you are experiencing any of these failure modes with your current tubing supply, contact our applications engineering team — we can help diagnose the root cause and recommend the appropriate specification change.

How to Qualify Peristaltic Pump Tubing: A Practical Protocol

Switching pump tubing suppliers — or qualifying a new tubing specification — requires a structured qualification protocol. Here is the framework we recommend:

Step 1: Dimensional Verification (Incoming Inspection)

• Measure ID, OD, and wall thickness on a statistically valid sample from each lot (minimum 10 pieces)

• Verify all dimensions are within specification tolerance

• Reject any lot where more than 1% of pieces fall outside tolerance

Step 2: Material Property Verification

• Verify Shore A hardness against specification (±3 Shore A acceptable)

• Request lot-specific CoA confirming tensile strength, elongation, and compression set

• Verify curing system (platinum-cured) via material documentation

Step 3: Biocompatibility Documentation Review

• Confirm ISO 10993-5 cytotoxicity report is current and covers the specific compound

• Confirm USP Class VI report is current and covers the specific compound

• Confirm 21 CFR 177.2600 compliance statement is available

• For pharmaceutical applications: confirm extractables data is available

Step 4: Functional Performance Testing

• Install tubing in your pump at standard occlusion setting

• Run pump at operating speed for 30 minutes to allow break-in

• Measure flow rate at 0h, 24h, 72h, 168h (1 week), and 500h

• Acceptable flow rate drift: ≤ 3% over 500 hours for precision dosing applications

Step 5: Sterilization Compatibility Verification

• Run samples through your actual sterilization protocol (3 cycles minimum)

• Re-measure ID, OD, wall thickness post-sterilization

• Verify no dimensional change > 1% and no visual degradation

Step 6: Accelerated Life Testing (for critical applications)

• Run pump continuously at 1.5× normal operating speed

• Inspect tubing at defined intervals for cracking, wall thinning, and spallation

• Establish failure mode and time-to-failure as a basis for replacement interval

Chensheng Medical Peristaltic Pump Tubing: Technical Specifications

For custom OEM pump tubing — specific ID/OD/wall combinations, custom hardness, custom colors, or private label packaging — see our complete OEM process guide: Custom Medical Silicone Products: The Complete OEM/ODM Process From Concept to Delivery

Frequently Asked Questions (FAQ)

Q1: How do I know which tubing size to order for my specific pump model?

A: Most pump manufacturers publish a tubing compatibility chart specifying the required ID, OD, and wall thickness for each pump head model. If you have the pump model number, our applications engineering team can confirm the correct tubing specification. Alternatively, send us a sample of your current tubing and we will measure and match it.

Q2: Can your pump tubing replace OEM tubing from the pump manufacturer?

A: In most cases, yes. Our tubing is manufactured to the same dimensional specifications as OEM pump tubing, using equivalent or superior platinum-cured silicone compounds. Many customers switch to Chensheng Medical tubing as a cost-effective alternative to OEM-branded tubing without any change in pump performance. We recommend running our qualification protocol (described above) before switching in a regulated application.

Q3: What is the minimum order quantity for peristaltic pump tubing?

A: For standard catalog sizes (common ID/OD/wall combinations), we can supply from as little as 10 meters for initial qualification. For custom sizes requiring new extrusion tooling, minimum order quantities depend on the tooling investment — our team will advise at quotation stage. Production orders are typically priced per meter with volume discounts from 100m, 500m, and 1,000m+.

Q4: Do you supply pump tubing pre-cut to specific lengths, individually packaged?

A: Yes. We offer value-added processing including cut-to-length, individual packaging, lot labeling, and sterile packaging (EtO or gamma sterilized). For single-use pump sets incorporating silicone tubing as a component, we can also supply tubing pre-assembled with connectors or fittings. Contact our team to discuss your specific packaging requirements.

Q5: How should peristaltic pump tubing be stored to maximize shelf life?

A: Store tubing in its original packaging in a cool (15–25°C), dry environment away from direct sunlight, UV sources, ozone-generating equipment, and solvents. Do not store tubing under compression or in a kinked position. Under these conditions, shelf life for platinum-cured silicone pump tubing is 3–5 years from the date of manufacture. Lot number and manufacture date are printed on all packaging for traceability.

Q6: We are experiencing flow rate drift with our current silicone tubing after approximately 200 hours. What is causing this and how can it be fixed?

A: Flow rate drift after 200 hours typically indicates one of three issues: (1) high compression set in the tubing material — the tubing is not fully recovering between compression cycles; (2) incorrect hardness for your pump's occlusion setting — tubing that is too soft deforms excessively; or (3) dimensional inconsistency — ID variation between lots causes apparent flow drift when tubing is replaced. Send us a sample of your current tubing and your pump specifications, and our applications engineering team will diagnose the root cause and recommend the correct specification.

Q7: Can you provide pump tubing that is already sterilized and ready for use in a cleanroom environment?

A: Yes. We offer EtO-sterilized and gamma-sterilized pump tubing, individually packaged in peel-open sterile pouches with sterilization lot documentation. Sterile pump tubing is produced in our ISO Class 7 cleanroom and packaged under cleanroom conditions before sterilization. Lead time for sterile pump tubing is typically 3–4 weeks from order confirmation (including sterilization processing and sterility release testing).

Q8: We need pump tubing with a specific color code to match our device's tube identification system. Can you produce colored silicone pump tubing?

A: Yes. We produce pump tubing in a full range of colors using FDA-compliant, biocompatibility-tested pigments. Standard colors include clear, blue, red, green, yellow, white, and black. Custom colors can be matched to your Pantone or RAL specification. Color does not affect the mechanical or biocompatibility properties of the tubing — all colored grades use the same platinum-cured silicone base compound and carry the same certifications as clear tubing.

Ready to Qualify Chensheng Medical Pump Tubing?

Whether you are qualifying a new pump tubing supplier, troubleshooting performance issues with your current supply, or developing a new pump-based medical device, our applications engineering team is ready to help.

What we offer:

• Free samples for qualification testing — standard sizes dispatched within 2 business days

• Full technical documentation: TDS · CoA · ISO 10993 reports · USP Class VI reports · 21 CFR 177.2600 compliance

• Custom size development — new extrusion tooling in 5–10 business days

• Applications engineering consultation — pump compatibility, specification selection, failure analysis

• Factory audit welcome — on-site or remote

→ Request Pump Tubing Samples→ Get a Custom Size Quotation→ Explore Our Medical Silicone Tubing Range

Related Articles:

• Platinum-Cured vs. Peroxide-Cured Silicone: Which Should You Choose?

• How to Choose Medical Grade Silicone Tubing: A Practical Guide for Healthcare Buyers

• USP Class VI, ISO 10993, and FDA 21 CFR 177.2600: Which Medical Silicone Certification Do You Actually Need?

• Custom Medical Silicone Products: The Complete OEM/ODM Process From Concept to Delivery

• How to Choose a Reliable Medical Silicone Manufacturer in China

• Medical-Grade Silicone Tubing for Respiratory Circuits: Compliance Requirements