Fluid Susceptibility & Contamination Testing for Products
Fluid susceptibility and contamination testing are performed to predict or evaluate the effect of chemicals, moisture, and other fluid contaminants on products and components.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
Fluid susceptibility and contamination testing evaluate how materials — polymers, elastomers, metals, coatings, and composites — respond to immersion in or contact with specific fluids, including fuels, hydraulic fluids, lubricants, coolants, solvents, and cleaning agents. The tests assess dimensional change, mass change, mechanical property retention, and visual degradation caused by fluid absorption, swelling, or chemical attack.
This testing is essential for qualifying materials and components for fluid contact applications in automotive, aerospace, defence, and industrial systems where fluid compatibility determines service reliability and safety.
Scope, Applications, and Benefits
Scope
Fluid susceptibility testing assesses how a material performs after exposure to specific fluids such as oils, fuels, solvents, or chemicals. It helps determine whether the material can maintain its physical, mechanical, and chemical integrity under service conditions.
Key parameters evaluated include:
- Mass change and volume swell after fluid immersion
- Retention of mechanical properties, such as tensile strength and hardness, after exposure
- Dimensional changes, including swelling, shrinkage, or distortion
- Visual signs of degradation, such as discolouration, blistering, or cracking
- Chemical compatibility, including extraction, leaching, or material breakdown behaviour
Applications
- O-ring, seal, and gasket material qualification
- Automotive fuel and brake fluid component compatibility
- Aerospace hydraulic fluid material approval (MIL-PRF-5606, Skydrol)
- Coolant and heat transfer fluid material compatibility
- Medical device fluid contact material qualification
Benefits
- Confirms material compatibility before product deployment
- Prevents in-service seal failures and fluid leakage
- Supports regulatory approval for fluid contact applications
- Enables comparison of alternative materials and coatings
- Provides data for lifetime prediction in fluid contact environments
Test Process
Specimen Preparation
Specimens are prepared and baseline dimensions, mass, and properties are recorded.
1Fluid Immersion
Samples are immersed in the test fluid at specified temperature and duration.
2Post-Immersion Check
Specimens are dried, re-measured, and visually inspected after exposure.
3Mechanical Testing
Exposed samples are tested and compared with controls for property retention.
4Technical Specifications
| Parameter | Details |
|---|---|
| Test Fluids | Fuels, hydraulic fluids, coolants, solvents, oils, acids |
| Temperature Range | Ambient to 200 °C |
| Immersion Duration | 24 hours to 1000+ hours |
| Measured Properties | Mass change, volume change, hardness change, tensile retention |
Instrumentation Used for Testing
- Constant temperature immersion baths (±0.5 °C)
- Analytical balance (mass change)
- Hardness tester (Shore A/D)
- Universal testing machine (tensile post-exposure)
- Dimensional measurement tools (micrometre, callipers)
- Visual inspection and photographic documentation
Results and Deliverables
- Baseline and post-exposure mass, volume, and dimension data
- % change values for all measured properties
- Mechanical property retention table (tensile, elongation, hardness)
- Visual inspection, observations, and photographs
- Compatibility classification (suitable/borderline/not suitable)
- Full fluid susceptibility test report
Why Choose Infinita Lab for Fluid Susceptibility and Contamination Testing?
At the core of this breadth is our network of 2,000+ accredited labs in the USA, offering access to over 10,000 test types. From advanced metrology (SEM, TEM, RBS, XPS) to mechanical, dielectric, environmental, and standardised ASTM/ISO testing, we give clients unmatched flexibility, specialisation, and scale. You’re not limited by geography, facility, or methodology—Infinita connects you to the right testing, every time.
Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote
Frequently Asked Questions
Elastomers (NBR, EPDM, FKM, silicone), thermoplastics (nylon, PTFE, POM), thermoset composites, and metallic coatings are most frequently tested. Elastomeric seals are particularly critical due to their direct fluid contact and sealing function.
Excessive volume swell (>20–30%) indicates high fluid absorption, which causes seal expansion, potential extrusion from grooves, and loss of sealing pressure. Shrinkage after removal from fluid can cause sealing gaps. Both extremes compromise seal integrity.
Yes. Customer-supplied service fluids can be used to replicate actual application conditions more closely. This is particularly valuable for proprietary formulations or multi-component fluid blends not represented by standard reference fluids.
ASTM D471 is specifically for rubber and elastomers; it measures mass, volume, and hardness changes after liquid immersion. ASTM D543 applies to plastics and evaluates resistance to chemical reagents, measuring appearance, weight, and dimension changes.
Acceptance criteria are defined by the application standard (e.g., AMS 3269 for aerospace seals, SAE J200 for automotive elastomers). Materials are qualified if all measured property changes fall within specified limits for the target fluid and exposure conditions.
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