Assess how fluids, oils, fuels, solvents, coolants, cleaners and service chemicals affect your product under agreed test conditions.
Resonate Testing supports fluid susceptibility programmes for aerospace, defence, transport, industrial, electronics and advanced engineering applications. Share your standard, drawings, material details, fluid list or specification so the route, accreditation position, safety constraints, sample needs and reporting expectations can be reviewed before quotation.
Fluid susceptibility testing assesses whether materials, components, assemblies or equipment can withstand exposure to specified service fluids under controlled conditions without unacceptable physical damage, degradation, contamination effects, safety concerns or loss of required performance.
Fluids: fuels, hydraulic fluids, lubricants, solvents, cleaners, coolants, brake fluids, de-icing fluids, disinfectants, insecticides and fire extinguishing foams.
Exposure routes: spray, immersion, partial immersion or other agreed temporary contact methods.
Observed effects: swelling, softening, cracking, coating damage, corrosion, dimensional change, mass change or loss of electrical performance.
Functional checks: Agreed inspections, measurements and functional checks before and after exposure help determine whether the product continues to meet its specified requirements.
Engineering decisions: Results support qualification, validation, material compatibility, reliability assessment, supplier approval and product acceptance decisions.
Environmental Testing
Ingress Protection Testing
Fire Testing
Vibration Testing
Fire Testing
Ready to plan your fluid susceptibility test? Send your standard, fluid list, SDS information, drawings, sample details and acceptance criteria for engineer review before quotation.
Fluid susceptibility requirements often depend on the application, material, fluid chemistry, fluid exposure route and acceptance criteria. An early review helps confirm whether the requested method is practical, safe and aligned with the evidence your stakeholders need.
Share your governing standard, fluid list, SDS information, drawings, sample details, exposure method, temperature, duration and functional monitoring needs. Resonate Testing can review feasibility, scope, safety and reporting expectations before quotation.
Qualification, validation and acceptance support
Material compatibility and supplier approval evidence
Spray, immersion and temporary exposure planning
RTCA DO-160, MIL-STD-810, DEF STAN, IEC, ISO, SAE and ASTM requirement review
Environmental, ingress protection, fire and vibration campaign links where relevant
Fluid susceptibility testing may be driven by RTCA DO-160G/H Section 11, MIL-STD-810H Method 504.3, BS 3G 100-2.3.12 General Requirements for Equipment for use on aircraft, DEF STAN 00-35 Part 3 Test CN4, IEC 60068-2-74 Test Xc, ISO 16750-5, SAE J1455, ASTM D543, ASTM D471 / ISO 1817, ISO 2812-1 / ASTM D870 or customer-specific requirements.
The standard defines the intent, but the practical route still depends on the exact fluid, concentration, exposure method, duration, temperature, material, sample geometry and acceptance criteria. SDS information and safety controls also need review before any quote or test plan can be confirmed.
Early standards review helps confirm whether the requested work can be completed within current scope, whether customer-supplied fluids are required and what evidence should be captured for qualification, acceptance, supplier approval or failure investigation.
Accreditation status is confirmed against the current UKAS schedule before quotation. Testing is subject to technical review, equipment availability, safety assessment, fluid availability and agreed scope.
| Standard / Guidance | Primary Focus | Typical Relevance to Testing |
|---|---|---|
| RTCA DO-160G Section 11 | Fluid Susceptibility | Fluid susceptibility requirements for airborne equipment, including exposure to representative aviation fluids. |
| RTCA DO-160H Section 11 | Fluid Susceptibility | Current RTCA fluid susceptibility guidance for airborne equipment qualification planning. |
| MIL-STD-810H Method 504.3 | Contamination by fluids | Contamination by fluids testing for defence and ruggedised equipment applications. |
| BS 3G 100-2.3.12 | Fluid contamination / susceptibility | General requirements for equipment for use on aircraft, including fluid susceptibility considerations for airborne equipment. |
| DEF STAN 00-35 Part 3 Test CN4 | Contamination by fluids | Defence environmental testing for contamination by fluids under specified service conditions. |
| IEC 60068-2-74 Test Xc | Fluid contamination | Environmental testing for fluid contamination exposure and post-exposure assessment. |
| ISO 16750-5 | Chemical loads | Road vehicle environmental conditions and testing for chemical loads on electrical and electronic equipment. |
| SAE J1455 | Chemical & Fluid Exposure | Heavy-duty vehicle environmental practices, including chemical and fluid exposure considerations. |
| ASTM D543 | Plastics chemical resistance | Plastics chemical resistance assessment. |
| ASTM D471 / ISO 1817 | Rubber & elastomer fluid resistance | Rubber and elastomer compatibility assessment. |
| ISO 2812-1 / ASTM D870 | Coating resistance to liquid / water | Coatings and paint system resistance to liquids or water exposure. |
| Customer specification | Project-specific fluid susceptibility | Project-specific fluids, exposure method, acceptance criteria, monitoring requirements and reporting expectations. |
RTCA DO-160H Section 11 and MIL-STD-810H Method 504.3 both evaluate the effects of fluid contamination on equipment, but they were developed for different operational environments and certification objectives.
Is an aerospace environmental qualification standard used primarily for civil aviation equipment. The section assesses the ability of airborne equipment to withstand exposure to fluids that may be encountered during aircraft operation and maintenance, such as hydraulic fluids, lubricating oils, cleaning agents, de-icing fluids, fuel, and other aircraft-related contaminants. The objective is to demonstrate that equipment continues to meet its performance requirements after exposure to specified fluids representative of the intended aircraft environment.
Is a military environmental test method intended to evaluate the resistance of materiel to contamination by fluids encountered during military operations. The method addresses a broader range of fluids and operational conditions, including fuels, hydraulic fluids, lubricants, decontaminants, cleaning compounds, and other substances that military equipment may encounter in field environments. The focus is on determining whether fluid exposure degrades operational capability, material properties, safety, or reliability.
Resonate Testing supports fluid susceptibility programmes where materials, components or finished equipment need to prove they can tolerate contact with service fluids without unacceptable damage, degradation or loss of function.
Our engineers review the requirement before test planning, including the governing standard, fluid list, SDS information, sample format, exposure route, temperature, duration, recovery period and acceptance criteria. This helps confirm whether the work is practical, safe and aligned with the evidence needed for qualification, compatibility assessment, supplier approval or customer acceptance.
Typical items include polymers, elastomers, metals, coatings, composites, seals, gaskets, O-rings, hoses, diaphragms, connectors, enclosures, electronic assemblies, electric propulsion components, battery modules, hydraulic and fuel-system components, adhesives, cable assemblies and protective finishes.
Depending on the requirement, test routes can include spray, immersion, partial immersion, wipe, drip, splash or another agreed temporary contact method. Typical assessments include visual inspection, dimensional or mass change, coating condition, swelling, softening, cracking, corrosion, electrical checks and agreed functional operation before and after exposure.
The following exposure conditions shall be defined and documented for each exposure cycle:
All exposure conditions should be consistently applied and recorded to ensure repeatability and accurate assessment of results.
| Specification | Capability |
|---|---|
| Applicable standard | RTCA DO-160G Section 11, RTCA DO-160H Section 11, MIL-STD-810H Method 504.3, DEF STAN 00-35 Part 3 Test CN4, IEC 60068-2-74 Test Xc, ISO 16750-5, SAE J1455 or customer-specific requirements |
| Fluid list | Fuel, oil, hydraulic fluid, lubricant, coolant, cleaner, solvent, de-icing fluid, disinfectant or other service chemical |
| Safety information | SDS, handling precautions, storage conditions, disposal requirements and any concentration or dilution instructions |
| Exposure method | Spray, immersion, partial immersion, wipe, drip, splash or other agreed contact route |
| Exposure conditions | Duration, temperature, sequence, recovery time, cleaning method and number of exposures |
| Test articles | Material coupons, coated samples, components, sub-assemblies or finished products |
| Pre-test checks | Visual condition, dimensions, mass, hardness, electrical checks, functional operation or agreed baseline evidence |
| Post-test checks | Swelling, softening, cracking, corrosion, coating change, dimensional change, mass change and functional performance |
| Acceptance criteria | Permitted cosmetic change, dimensional tolerance, material property limits, electrical limits or other requirements |
| Reporting output | Fluid details, achieved conditions, observations, photographs where agreed, measured changes, functional check results and acceptance evidence |
Plan: Review the requirement, fluid list, standards, safety information, acceptance criteria and success measures.
Prepare: Confirm samples, conditioning, exposure route, fluid handling controls and any baseline measurements.
Baseline: Record agreed visual, dimensional, mass, material, electrical or functional checks before exposure.
Expose: Apply the agreed fluid by spray, immersion, partial immersion, wipe, drip or other specified method.
Condition and recover: Maintain the agreed exposure duration, temperature, sequence, recovery time and cleaning approach.
Inspect and measure: Check for swelling, cracking, softening, corrosion, coating change, dimensional change or performance loss.
Review and report: Summarise achieved conditions, observations, evidence and results against the agreed acceptance criteria.
Product drawings, material details, coatings and sample configuration
Fluid list, concentrations, SDS information and handling constraints
Applicable standard, customer specification or acceptance requirement
Exposure method, temperature, duration, sequence and recovery conditions
Number of samples, controls, repeats and any witness sample requirements
Baseline and post-exposure checks such as visual inspection, mass, dimensions, hardness, electrical checks or functional operation
Cleaning, drying, neutralisation or handling requirements after exposure
Hazardous material, flammability, storage or disposal constraints
Known compatibility concerns, previous failures or materials that need special attention
Reporting, photographic evidence and witness requirements
The exposure route is the agreed way the fluid is applied to the sample. Common routes include spray, immersion, partial immersion, wipe, drip, splash or another temporary contact method specified by the standard or customer requirement.
Exposure duration is the time the sample remains in contact with the fluid under the agreed conditions. It should be defined with the exposure temperature, sequence, recovery time and any cleaning or drying approach.
A fluid list identifies the service fluids to be considered for the test, such as fuels, oils, hydraulic fluids, solvents, cleaners, coolants or de-icing fluids. It should include concentration and handling details where relevant.
SDS information is safety data for the fluid. It supports safe handling, storage, concentration review, disposal planning and assessment of whether the proposed exposure method is practical.
A control sample is an unexposed or separately managed sample used for comparison where required. It helps distinguish fluid-related change from normal variation, handling effects or pre-existing sample condition.
Fluid susceptibility testing can involve aggressive or safety-critical liquids, including fuels, oils, hydraulic fluids, solvents, cleaners and de-icing fluids. The test route should account for the chemical, the product materials and the way the fluid is expected to contact the item in service.
Compatibility risk should be reviewed early if the product includes adhesives, coatings, seals, elastomers, polymers, labels, connectors, optics, electronics or porous materials. SDS information, cleaning requirements, disposal constraints and acceptance criteria should be agreed before the work is quoted or committed.
Many products need fluid exposure evidence alongside other environmental, material or functional assessments. Coordinating the fluid list, sample preparation, acceptance criteria and reporting format early helps keep the qualification route clear and avoids repeating set-up decisions later.
For projects with multiple test needs, share the full programme context before quotation so sequencing, handling, sample availability and evidence requirements can be reviewed together.
A fluid susceptibility test gives you structured evidence showing how a material, component or finished product responded to controlled exposure with the agreed service fluids.
The result is practical qualification, compatibility or acceptance evidence that can support customer approval, supplier evaluation, design validation or a wider environmental test programme.
Share your standard, fluid list, SDS information, drawings, sample details, exposure conditions and acceptance criteria so the most practical route can be reviewed before quotation.
Whether you’re looking to contact us for the first time or have another testing requirement, we’d love to hear from you.
