Water repellency performance testing service

Water Repellency Performance Testing Service – Accredited Evaluation for Textiles, Leather, and Coated Materials

For Bangladeshi manufacturers, exporters, and procurement managers in the textile, apparel, leather, and construction industries, reliable water repellency is a critical quality attribute that directly affects product functionality, consumer satisfaction, and compliance with international buyer specifications. Our ISO/IEC 17025 accredited laboratory offers a complete water repellency performance testing service that quantifies surface wetting, resistance to water penetration, and durability of hydrophobic treatments under simulated real‑world conditions. With decades of experience in material science and surface characterisation, we help you verify production batches, qualify new chemical finishes, and meet the stringent requirements of Bangladesh’s garment and footwear export markets as well as local infrastructure projects.

Product Samples We Regularly Test

We accept a wide range of products and materials that rely on water‑repellent or waterproof properties. Our test protocols are validated for woven, knitted, non‑woven, coated, and laminated substrates. Common samples include:

• Outerwear and performance apparel – raincoats, jackets, windbreakers, ski suits, and workwear.
• Technical textiles – tent fabrics, awnings, tarpaulins, and parachute silk.
• Footwear upper and lining materials – leather, synthetic leather, and textile upper components.
• Leather goods – bags, belts, upholstery leather, and finished hides.
• Coated fabrics and laminates – PVC, PU, PTFE, and silicone‑coated textiles.
• Geotextiles and construction membranes – roof underlay, foundation waterproofing sheets, and pond liners.
• Medical textiles and protective clothing – surgical gowns, drapes, and chemical‑protective coveralls.

Textile and Apparel Water Repellency Testing

For the readymade garment (RMG) sector – Bangladesh’s largest export industry – precise measurement of water repellency ensures that finished products meet buyer quality standards. Our water repellency performance testing service includes the most widely accepted international methods:

• Spray rating test (ISO 4920, AATCC 22) – A standardised spray nozzle delivers a controlled shower of water onto a stretched fabric sample at a 45° angle. The wetting pattern is visually rated against a standard chart (0 to 100, with 100 indicating no surface wetting). We report the spray rating and provide photographic documentation for traceability.
• Hydrostatic pressure resistance (ISO 811, AATCC 127) – The sample is clamped over a test head and subjected to increasing water pressure at a controlled rate (typically 1 kPa/min or 10 cm H₂O/min). The pressure at which water penetrates (third drop appears on the reverse side) is recorded as the hydrostatic head in kPa or cm H₂O. This is essential for rainwear and tents.
• Dynamic water impact penetration (ISO 9865, AATCC 35) – A high‑velocity water jet (150 L/min) impacts the fabric for a set duration, and the water absorbed by a blotter paper behind the sample is weighed. This simulates heavy rain or splash conditions and is critical for outdoor performance.
• Surface wetting time and contact angle (ASTM D7334, ISO 15989) – We use a goniometer to measure the static contact angle of a water droplet on the fabric surface. Multiple readings (typically 5‑10 per sample) provide an average contact angle, which correlates directly with the effectiveness of the fluorocarbon or silicone finish.
• Water repellency after accelerated laundering (ISO 6330, AATCC 135) – We conduct multiple home‑laundering cycles and then re‑test spray rating and hydrostatic head to evaluate the durability of the repellent finish – a key requirement for many European and North American buyers.

Leather and Footwear Material Water Resistance

Leather goods and shoe materials require specific test methods that account for the flexible, porous nature of the substrate. Our laboratory is equipped to handle both finished leather and synthetic upper materials:

• Water absorption and desorption (ISO 2417, ASTM D6016) – We measure the amount of water absorbed by the leather sample over a specified time (e.g., 24 hours) using a static immersion test, and also record the drying‑out rate – relevant for comfort and breathability.
• Maeser flexing water penetration (ASTM D2099, SATRA TM34) – For footwear, we flex the leather or synthetic upper material repeatedly (up to 100,000 cycles) in the Maeser flex tester while the lower surface is in contact with water. The number of cycles at which water first penetrates is reported as the flexing water resistance index.
• Bally penetrometer (ISO 5403, DIN 53338) – Another dynamic flex test specifically for leather, where the sample is clamped and flexed over a conical mandrel while water is applied to the top. We record the cycle count at breakthrough and provide a visual classification.
• Dynamic water resistance for finished shoes (ISO 20344, SATRA TM77) – For complete footwear assemblies, we place the shoe in a water bath and subject it to mechanical flexing (simulating walking) while monitoring internal moisture ingress. This is the definitive test for waterproof footwear.
• Surface water repellency for suede and nubuck (AATCC 193, ISO 23232) – Using a droplet test and a rating scale (from 1 to 8), we assess the repellency of high‑pile leathers, which are particularly difficult to treat uniformly.

Coated Fabrics, Laminates, and Waterproof Membranes

For industrial and construction applications, coated and laminated materials must offer absolute water barrier properties. Our test suite evaluates both the coating integrity and the interface adhesion:

• Hydrostatic pressure test for coated fabrics (ISO 1420, ASTM D751) – Similar to the fabric test but with a larger sample area and lower pressure ramp rates, this method is specifically designed for rubber‑ or plastic‑coated textiles. We report the pressure at breakthrough and also note any delamination.
• Low‑temperature flex and crack resistance (ISO 7854, ASTM D2137) – Coated fabrics can become brittle at low temperatures, leading to cracking and loss of water repellency. We condition samples at ‑20°C or ‑40°C and flex them around a mandrel, then perform a dye‑penetration test to detect invisible cracks.
• Water vapour transmission (WVTR – ISO 15496, ASTM E96) – For breathable waterproof membranes (e.g., PTFE, ePTFE), we measure the moisture vapour transmission rate using the cup method (desiccant or water). This is essential for high‑performance sportswear where both repellency and breathability are required.
• Peel strength of laminated layers (ASTM D2724, ISO 2411) – We determine the force required to separate the coating or laminate from the textile substrate; poor adhesion can compromise long‑term repellency after flexing.
• Resistance to hydrostatic pressure after abrasion (ISO 12947, Martindale) – To simulate wear and tear, we abrade the coated fabric surface for a set number of cycles and then repeat the hydrostatic test – a rigorous assessment of coating durability.

Geotextiles and Construction Waterproofing Membranes

With growing infrastructure investment in Bangladesh – including bridges, flood embankments, and building foundations – testing of geosynthetic materials is in high demand. Our water repellency performance testing service extends to these heavy‑duty applications:

• Hydrostatic pressure resistance for geomembranes (ASTM D519, ISO 12958) – Using a pressurised water column, we test both seamless and seamed sheets to ensure no leakage through pinholes or seam defects. We also conduct seam peel tests after water exposure.
• Water permeability and flow rate (ASTM D4491, ISO 11058) – For drainage geocomposites, we measure the coefficient of permeability under varying confining pressures, ensuring that water can pass through the drainage layer without clogging.
• Resistance to root penetration (FLL test method) – For green roof membranes, we expose samples to root‐growth conditions for a specified period and then visually inspect for any root‑tip penetration – an indirect assessment of watertight integrity.
• UV and thermal aging followed by water repellency testing (ASTM D4355, ISO 4892) – We accelerate weathering using xenon‑arc or UV fluorescent lamps, then re‑test hydrostatic resistance and tensile strength to predict service life in tropical climates.

Surface Chemical Analysis and Finish Characterisation

Understanding the chemistry behind water repellency helps our clients troubleshoot problems and optimise finishing processes. We provide complementary analytical services that support our core testing:

• Attenuated total reflectance – Fourier transform infrared spectroscopy (ATR‑FTIR – ASTM E1252, ISO 4650) – Identifies the chemical nature of the repellent finish (fluorocarbon, silicone, wax, etc.) and can detect uneven application or degradation.
• X‑ray photoelectron spectroscopy (XPS – ASTM E1523) – For advanced studies, we measure the surface elemental composition (particularly fluorine and silicon), which correlates with the repellency gradient across the material.
• Contact angle hysteresis and sliding angle measurement (ASTM D7490) – Using a precision tensiometer, we determine the advancing and receding contact angles, as well as the sliding angle, which better predict dynamic water shedding performance.
• Extraction and quantification of fluorinated compounds (EN 14362, OEKO‑TEX) – For compliance with restricted substance lists (e.g., PFOS, PFOA), we perform solvent extraction and LC‑MS/MS analysis – a crucial service for export to EU and US markets.

Report Accreditation and Compliance for Bangladesh

All test methods described above are performed under our ISO/IEC 17025:2017 accredited quality management system, ensuring traceable calibrations, validated procedures, and technically competent staff. Our water repellency test reports are widely accepted by the Bangladesh Standards and Testing Institution (BSTI) for product certification and import clearance, and they align with the quality requirements of the Bangladesh Garment Manufacturers and Exporters Association (BGMEA) for RMG shipments. We also adhere to the test protocols specified by major international buyers (e.g., H&M, Inditex, Nike, Adidas) and by regulatory bodies such as the Bangladesh Environmental Conservation Department for chemical compliance. Each report includes a detailed description of sample preparation, test conditions, raw data, statistical summary, and a professional interpretation of whether the material meets the specified repellency grade – giving you full confidence during factory inspections, supplier audits, and export documentation.

Why Choose Our Water Repellency Performance Testing Service

We understand that time‑to‑market and quality consistency are paramount for Bangladeshi exporters. Our laboratory offers rapid turnaround, competitive pricing, and a dedicated technical team that explains results in practical, business‑oriented terms. We can design custom test plans that combine multiple methods (e.g., spray rating + hydrostatic head + laundering durability) to match your specific product requirements. Whether you are a textile mill evaluating a new C6‑based repellent, a footwear manufacturer verifying a waterproof batch, or a construction company testing geomembranes for a major project, our water repellency performance testing service delivers the accuracy and reliability you need. Contact us to discuss your material types, performance targets, and export destinations – we will propose a tailored test programme that ensures your products shed water consistently and withstand the demands of global markets.