Fluid resistance testing service

Fluid Resistance Testing Service – Accredited Evaluation of Material Integrity Against Liquids, Oils, Solvents, and Chemicals

For Brazilian manufacturers, importers, and quality engineers in the automotive, aerospace, medical, packaging, and industrial sectors, the ability of a material to resist the ingress, absorption, or degradation caused by fluids – whether water, oil, fuel, solvents, cleaning agents, or biological media – is a fundamental performance parameter that affects safety, durability, and regulatory compliance. Components and packaging that fail to resist fluid penetration can suffer from corrosion, swelling, cracking, delamination, loss of mechanical properties, contamination, and even catastrophic failure. Our ISO/IEC 17025 accredited laboratory offers a comprehensive fluid resistance testing service that quantifies the resistance of materials to a wide range of liquids under controlled conditions of temperature, pressure, and time, using standardised methods such as immersion, spray, wicking, and pressurised exposure, in full compliance with ABNT NBR, ASTM, ISO, and customer‑specific specifications. With decades of experience in materials characterisation and chemical compatibility, we provide precise, repeatable, and fully documented test results that are accepted by INMETRO, ANVISA, and Brazilian notified bodies, supporting your product approval, quality assurance, and regulatory compliance.

Materials and Products We Regularly Test

We accept a wide range of materials, components, and assemblies that may come into contact with fluids during service, transport, or storage. Our test setups are adaptable to different specimen sizes, shapes, and material types, and we can evaluate both raw materials and finished products. Common samples include:

• Polymers and plastics – thermoplastics (PE, PP, PVC, PET, PA, PC, ABS, POM), thermosets (epoxy, polyester, phenolic), elastomers (rubber, silicone, EPDM, NBR), and composites (GFRP, CFRP).
• Coatings and paints – automotive, industrial, architectural, and marine coatings, as well as powder coatings and primers.
• Seals, gaskets, and O‑rings – for hydraulic, pneumatic, and fuel systems.
• Adhesives and sealants – structural adhesives, anaerobic adhesives, and joint sealants.
• Packaging materials – films, laminates, foils, and containers for food, pharmaceutical, and cosmetic products.
• Medical devices and components – IV tubing, catheters, syringes, and implant materials.
• Automotive and aerospace parts – fuel tanks, hoses, gaskets, and interior trim.
• Textiles and nonwovens – for protective clothing, upholstery, and filtration applications.

Core Test Methods – Immersion, Spray, Wicking, and Pressurised Exposure

Our fluid resistance testing service uses a suite of standardised methods to simulate the different ways materials are exposed to fluids in service. The selection of the method depends on the material, the application, and the type of fluid involved. All tests are performed under controlled temperature and humidity conditions:

• Immersion test (ASTM D471, ISO 1817, ABNT NBR ISO 1817, and ASTM D543) – We fully immerse the test specimen in the selected fluid (e.g., water, oil, fuel, hydraulic fluid, acid, base, solvent) at a specified temperature (ambient, 40°C, 70°C, 100°C, or higher) for a defined duration (24, 72, 168, or 1,000 hours). After immersion, we evaluate the changes in mass, dimensions, volume, hardness, tensile strength, elongation, and appearance. The swelling, extraction, or degradation is quantified, and the material’s compatibility with the fluid is assessed. This is the most common and versatile method for fluid resistance testing.
• Spot and wipe test (ASTM D1308, ISO 2812, ABNT NBR ISO 2812) – For coatings and painted surfaces, we apply a drop of the test fluid on the surface and cover it with a watch glass to prevent evaporation. After a defined exposure time (e.g., 1, 4, 24 hours), we evaluate the effect on the coating’s appearance (blistering, discolouration, softening, loss of adhesion). This method is used for assessing resistance to staining, chemical attack, and cleaning agents.
• Spray test (ASTM D1735, ISO 6270‑2, and ABNT NBR ISO 6270‑2) – We expose the specimen to a controlled spray of the test fluid (or condensate) in a humidity chamber, simulating conditions of high humidity or direct wetting. This is often used for coatings, paints, and exterior building materials to evaluate their resistance to rain, dew, and moisture.
• Wicking and capillary rise test (ASTM D5229, ISO 14869) – For porous materials, textiles, and nonwovens, we measure the rate of fluid wicking or capillary rise through the material. This is important for evaluating the fluid barrier properties of protective clothing, filters, and absorbent materials.
• Pressurised fluid resistance test (custom – based on customer requirements) – For components that are exposed to fluids under pressure (e.g., hydraulic hoses, fuel lines, gaskets), we apply a defined internal pressure while the component is immersed in or exposed to the test fluid. We monitor for leakage, swelling, or failure, simulating real‑world operating conditions.
• Cyclic exposure (ASTM D1193, ISO 15711) – We alternate between immersion and drying periods to simulate the wet‑dry cycles that materials experience in outdoor and industrial environments. This method is particularly relevant for building materials, marine coatings, and automotive underbody components.
• Fluid resistance after UV or thermal aging – we pre‑condition the material under accelerated aging (UV, heat, or humidity) and then perform the fluid resistance test to assess the combined effect of aging and chemical exposure – This provides a more realistic simulation of long‑term service conditions.

Specific Fluid Types and Test Conditions

We can test resistance against a wide range of fluids, including those commonly encountered in Brazilian and global industries:

• Water and aqueous solutions – deionised water, tap water, seawater, demineralised water, and water‑based cleaning solutions.
• Oils and lubricants – mineral oils, synthetic oils, hydraulic fluids, gear oils, and engine oils (both fresh and used).
• Fuels – gasoline, diesel, biodiesel, ethanol, jet fuel, and fuel blends (e.g., E10, E20, E100).
• Solvents and cleaning agents – acetone, isopropanol, ethanol, methanol, toluene, xylene, methyl ethyl ketone (MEK), trichloroethylene, and industrial degreasers.
• Acids and bases – hydrochloric acid (HCl), sulfuric acid (H₂SO₄), nitric acid (HNO₃), acetic acid, sodium hydroxide (NaOH), and ammonium hydroxide (NH₄OH) – at various concentrations (0.1% to 98%).
• Biological and medical fluids – saline solution, blood, artificial sweat, urine, and simulated gastric fluids.
• Food and beverage products – fruit juices, soft drinks, milk, oils, and food-grade solvents.
• Other fluids – refrigerants (R‑134a, R‑1234yf), brake fluids (DOT 3, DOT 4, DOT 5), and process chemicals.

Evaluation Criteria and Interpretation of Results

After the exposure, we perform a comprehensive evaluation of the specimen to quantify the effect of the fluid on the material. The specific criteria depend on the material type and the application:

• Change in mass – we measure the mass before and after exposure to determine the amount of fluid absorbed or material extracted – An increase in mass indicates absorption or swelling; a decrease in mass indicates dissolution or extraction of components.
• Change in dimensions and volume – we measure the thickness, diameter, length, and volume to quantify the swelling or shrinkage – Swelling can lead to dimensional instability and stress in assemblies.
• Change in hardness – we measure the Shore hardness (A, D, or IRHD) before and after exposure to assess the change in rigidity – A reduction in hardness indicates plasticisation or degradation; an increase indicates hardening or crosslinking.
• Change in tensile properties – we perform tensile tests on the exposed specimens to measure the residual strength, elongation, and modulus, and compare with the unexposed controls – A loss of tensile strength or elongation indicates significant degradation.
• Change in appearance – we visually inspect the specimen for blistering, cracking, discolouration, chalking, or other surface defects – The defects are classified according to standard rating scales (e.g., ASTM D714, ISO 4628).
• Change in adhesion – for coated surfaces, we perform a cross‑cut or pull‑off test after exposure to evaluate the residual adhesion to the substrate – A loss of adhesion indicates chemical attack of the coating‑substrate interface.
• Change in electrical properties – for insulating materials, we measure the insulation resistance, dielectric strength, and surface resistivity after exposure – A reduction in electrical properties can indicate fluid ingress, contamination, or degradation of the insulation.
• Pass/fail determination – we compare the measured changes with the specified limits (e.g., maximum allowable weight change, minimum required tensile strength retention) and issue a clear pass/fail conclusion – We also provide a detailed explanation of the results and any recommended actions.

Environmental and Operational Conditioning

Fluid resistance can be significantly affected by temperature, pressure, and aging. We offer testing under various conditioning regimes:

• Temperature conditioning – we perform the fluid exposure tests at different temperatures (e.g., 5°C, 23°C, 40°C, 70°C, 100°C) to simulate the effect of the service environment – Elevated temperatures accelerate the degradation processes and reveal potential failure modes.
• Pressure conditioning – for components that operate under pressure, we perform the fluid exposure under controlled pressure (e.g., 0.5, 1, 5, 10 bar) to simulate realistic service conditions – This is particularly important for sealing components and pressurised systems.
• Cyclic conditioning – we alternate between immersion in the fluid and drying periods, or between different fluids, to simulate real‑world conditions – This is relevant for components exposed to multiple fluids (e.g., fuel and water) or to wet‑dry cycles (e.g., outdoor applications).
• Pre‑conditioning – we subject the specimens to UV, thermal, or humidity aging before the fluid exposure, to evaluate the synergistic effect of aging and chemical attack – This provides a more realistic prediction of the material’s long‑term performance.

Calibration, Traceability, and Quality Assurance

All fluid resistance tests are performed under our ISO/IEC 17025 accredited quality system, with full traceability of temperature, mass, dimensions, and force measurements:

• Calibration of balances, ovens, and temperature baths – using certified reference standards traceable to Inmetro – The measurement uncertainty for mass is < 0.01 g, for temperature is < 0.5°C, and for dimensions is < 0.01 mm.
• Calibration of hardness testers and tensile testing machines – with certified reference blocks and load cells – The uncertainty for hardness is < 1 point, and for force is < 0.5%.
• Verification with reference materials – we test known reference materials (e.g., a standard rubber compound or a certified polymer) at regular intervals to confirm the stability and reproducibility of the test system – The results are monitored on control charts.
• Interlaboratory comparisons – we participate in proficiency testing schemes for fluid resistance and immersion testing – Our results are periodically validated against other accredited laboratories.

Compliance with Brazilian and International Standards

Our fluid resistance testing services support compliance with the key Brazilian and international standards for materials, packaging, and product safety:

• ABNT NBR ISO 1817 (Rubber, vulcanized or thermoplastic – Determination of the effect of liquids) – The main Brazilian standard for fluid resistance testing of elastomers.
• ASTM D471 (Standard Test Method for Rubber Property – Effect of Liquids) – The most widely used US standard for fluid resistance testing of rubber.
• ASTM D543 (Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents) – For plastics and polymeric materials.
• ISO 2812 (Paints and varnishes – Determination of resistance to liquids) – For coatings and painted surfaces.
• ABNT NBR ISO 10993‑12 (Biological evaluation of medical devices – Sample preparation and reference materials) – For medical devices that come into contact with bodily fluids.
• ANVISA and INMETRO requirements – for packaging and materials in contact with food, pharmaceuticals, and cosmetics – Our tests are accepted for product registration and market approval.
• Regulations for automotive and aerospace components – including OEM specifications (e.g., VW, Fiat, GM, Ford, Embraer) – Our reports are accepted by major manufacturers and suppliers.

Reporting and Accreditation

All fluid resistance tests are performed under our ISO/IEC 17025 accredited quality system, with full traceability of all measurement parameters. Our Inmetro‑accredited reports are recognised by INMETRO, ANVISA, and various Brazilian certification bodies. Each report includes:

• A complete description of the test specimen (material, dimensions, conditioning).
• Details of the test fluid, temperature, duration, and test method.
• Measured changes in mass, dimensions, volume, hardness, tensile properties, appearance, and adhesion.
• Pass/fail determination against the specified requirements.
• Photographic documentation of the specimen before and after exposure.
• Calibration certificates for all test equipment and measurement uncertainty statements.
• Recommendations for material improvement or alternative solutions, if necessary.

Our reports provide the confidence you need to certify your materials, components, and products for fluid‑contact applications, ensuring safety, durability, and compliance with Brazilian and international standards.

Why Choose Our Fluid Resistance Testing Service?

We understand that fluid resistance is a critical performance attribute for materials and components used in many industrial and consumer applications. A material that fails to resist the fluids it encounters can lead to premature failure, safety hazards, and costly recalls. Our team offers rapid turnaround, flexible test programmes (from single‑fluid screening to comprehensive multi‑fluid, multi‑temperature characterisation), and clear, actionable interpretation of results – we do not just provide numbers; we explain the degradation mechanisms, the implications for your application, and the necessary improvements. We work closely with your design, materials, and quality teams to select the most appropriate test fluids, exposure conditions, and acceptance criteria for your specific material and application. With state‑of‑the‑art test equipment, traceable calibrations, and a highly experienced team, our fluid resistance testing service delivers the accuracy, repeatability, and regulatory acceptance you need to ensure that your materials and products can withstand the fluids they will encounter in service. Contact us to discuss your materials and application – we will develop a customised test programme that provides the definitive evidence of your product’s fluid resistance.