Moisture Absorption Research Testing – Accredited Hygroscopic and Capillary Uptake Characterization for the Czech Market
Our internationally accredited laboratory delivers comprehensive moisture absorption research testing that quantifies how materials and products interact with water in vapour and liquid form – from the initial rate of capillary uptake and the equilibrium moisture content at a given relative humidity to the long-term saturation mass and the effects of absorbed water on dimensional stability and mechanical integrity. All tests are conducted under the rigorous ISO/IEC 17025 quality system, and every report bearing the ILAC mark is unconditionally accepted by the Czech Trade Inspection Authority, the State Agricultural and Food Inspection Authority, customs offices and all notified bodies in the European Union. For Czech textile mills, building product manufacturers, polymer compounders, pharmaceutical packaging suppliers and timber exporters, this independent data is the foundation of reliable product declarations, CE marking under the Construction Products Regulation, material specifications and warranty agreements.
Product Samples We Regularly Subject to Moisture Absorption Research Testing
The gravimetric, volumetric and dynamic vapour sorption instruments in our laboratory accommodate a vast range of material types. The following categories represent the most frequently tested items:
- Textile fibres, yarns and fabrics – natural fibres (cotton, wool, linen), regenerated cellulose (viscose, lyocell), synthetics (polyester, nylon, polypropylene) and blended woven or knitted materials
- Plastics and polymer composites – polyamide and polycarbonate granules, epoxy and polyester resins, glass-fibre reinforced laminates, and 3D-printed polymer parts
- Building materials and construction products – clay bricks, calcium silicate blocks, aerated concrete, natural stone, mortars, renders, plasters and thermal insulation boards
- Food contact materials and pharmaceutical packaging – moulded fibre trays, paperboard cartons, flexible laminates, blister films and closure liners
- Wood and wood-based panels – solid timber, glued laminated elements, plywood, OSB, particleboard and fibreboard
- Nonwovens and absorbent hygiene products – wound dressings, cosmetic wipes, disposable diapers and incontinence pads
- Leather and coated fabrics – shoe upper leather, automotive upholstery and technical coated textiles
- Powders, granules and bulk solids – food ingredients, pharmaceutical excipients, detergents and mineral fillers
Textiles and Fibrous Assemblies – Moisture Absorption Research Testing of Regain, Retention and Drying
- Determination of the commercial moisture regain of textile fibres according to ČSN EN ISO 6741-1 and ASTM D1909: oven-dry specimens are conditioned in a standard atmosphere of 20 °C and 65 % relative humidity until equilibrium is reached, after which the percentage of absorbed water relative to the dry mass is calculated. This value is critical for the correct invoicing of textile shipments by conditioned mass and is routinely requested by Czech spinning mills and yarn traders.
- Water absorption and wicking rate of fabrics according to AATCC 79 and ČSN EN ISO 9073-6 (for nonwovens): a defined drop of distilled water is placed on the fabric surface, and the time for the droplet to lose its specular reflectance is recorded. For nonwovens, the time for a droplet to fully penetrate the sheet is measured. These parameters are used by manufacturers of towels, sportswear and medical gauze to benchmark the instantaneous absorbency of their products.
- Water retention capacity of superabsorbent fibres and wound dressings according to ČSN EN ISO 13726-1 and internal protocols: the sample is fully immersed in excess distilled water or test liquid, then allowed to drain freely under gravity. The mass of liquid retained per gram of fibre is reported, which is a fundamental performance indicator for Czech suppliers of advanced wound care materials.
- Dynamic moisture vapour sorption of textile materials: using a gravimetric dynamic vapour sorption analyser, the mass change of a small specimen is recorded as the relative humidity is stepped from 0 % to 95 % and back. The resulting sorption isotherm and hysteresis loop reveal the fibre's affinity for moisture, the monolayer capacity and the tendency to swell, data that Czech sportswear designers use to select fibres for optimum thermophysiological comfort.
- Drying rate after saturation: a specimen saturated with a defined amount of water is placed on a heated plate at 37 °C, and the time to complete evaporation is measured. This test, frequently coupled with the absorption measurement, provides a complete picture of liquid handling for towels, bathrobes and beachwear sold on the Czech retail market.
Plastics, Composites and Polymer Foams – Moisture Absorption Research Testing According to ISO 62 and ASTM D570
- Water absorption of plastics after immersion according to ČSN EN ISO 62 and ASTM D570: disc or rectangular specimens are immersed in distilled water at 23 °C, 70 °C or boiling temperature for defined periods up to saturation. The percentage increase in mass is recorded at intervals, and the saturation moisture content and Fickian diffusion coefficient are calculated. For Czech injection moulders of polyamide parts, this test verifies that the material will not exceed the allowable moisture uptake before dimensional stability is compromised.
- Moisture absorption of fibre-reinforced composites according to ČSN EN 2378 and ASTM D5229: laminates intended for aircraft interiors, structural profiles and sports equipment are subjected to long-term immersion or exposure to 85 % RH at elevated temperature. The through-thickness moisture profile and the resulting reduction in glass transition temperature and flexural strength are evaluated, providing the data required for the certification of composite parts manufactured in the Czech Republic.
- Water absorption of cellular plastics (EPS, XPS, PUR) according to ČSN EN 12087 (long-term immersion) and ČSN EN 1609 (partial immersion): full-size insulation boards are immersed in water, and the water uptake after 28 days is measured. For Czech specifiers of inverted roof insulation and foundation protection, this test confirms compliance with the declared long-term water absorption values in the harmonised product standards.
- Moisture content of polymer granules by Karl Fischer titration according to ČSN EN ISO 15512: the water content in parts per million is determined by heating the granulate and titrating the released water. This is a routine quality control parameter requested by Czech converters of engineering plastics to avoid processing defects such as splay and hydrolysis.
Building Materials and Mineral-Based Products – Hygroscopic Sorption and Capillary Water Absorption
- Hygroscopic sorption properties of building materials according to ČSN EN ISO 12571: specimens are conditioned in desiccators over saturated salt solutions providing a range of relative humidities. The equilibrium moisture content at each humidity level is determined, and the sorption isotherm is plotted. This data is used in Czech building physics simulations to predict the risk of interstitial condensation and mould growth in external walls and roof assemblies.
- Capillary water absorption coefficient of mortars, renders and plasters according to ČSN EN 1015-18 and ČSN EN 15801: the lower face of a dried specimen is placed in contact with water, and the mass gain is recorded as a function of the square root of time. The water absorption coefficient in kg/(m²·min⁰·⁵) is calculated from the linear portion of the curve. This parameter is essential for the specification of renovation plasters for damp masonry in historic Czech buildings.
- Water absorption of clay masonry units according to ČSN EN 772-11 and ČSN EN 771-1: bricks and blocks are boiled in water for a specified duration, and the cold and boiling water absorptions are determined. The results are used to classify the units for durability and to calculate the freeze-thaw resistance, a mandatory assessment for facing bricks used in the Czech climate.
- Water absorption of natural stone according to ČSN EN 13755: stone cubes or cylinders are immersed at atmospheric pressure, and the water absorption at saturation is expressed as a percentage of the dry mass. Czech quarry operators and stonemasons use this data to select stone for paving, cladding and restoration work.
Packaging, Paper and Hygroscopic Bulk Solids – Moisture Absorption Research Testing for Product Stability
- Water vapour sorption isotherms of food powders and pharmaceutical excipients: a dynamic vapour sorption analyser or desiccator method is used to determine the equilibrium moisture content of starches, sugars, proteins and cellulose powders as a function of water activity. For Czech food manufacturers and pharmaceutical formulators, this data is essential for predicting caking, flowability and microbial stability.
- Moisture content of paper, board and moulded fibre packaging according to ČSN EN ISO 287 and ČSN ISO 287: the oven-drying method is used to determine the dry mass and the moisture content as received. This test is regularly performed by Czech packaging converters to verify that the board meets the specifications for corrugator operations and that the finished boxes will not suffer from dimensional instability during storage.
- Cobb water absorption test for paper and board according to ČSN EN ISO 535: a defined area of the paper surface is exposed to water for a specified time, and the mass of water absorbed per square metre is determined. For Czech suppliers of water-resistant packaging, a low Cobb value confirms the effectiveness of internal sizing and surface coatings.
Wood, Timber and Wood-Based Products – Moisture Absorption, Equilibrium Moisture Content and Swelling
- Determination of moisture content of solid wood according to ČSN EN 13183-1 and ČSN EN ISO 13061-1: the oven-dry method is used to determine the moisture content of sawn timber, glulam and cross-laminated timber, expressed as a percentage of the dry mass. For Czech carpenters and timber frame manufacturers, the moisture content at the time of assembly is a critical control point to prevent subsequent cracking and joint failure.
- Equilibrium moisture content and dimensional stability of wood-based panels according to ČSN EN 322 and ČSN EN 318: particleboard, OSB, MDF and plywood specimens are conditioned to equilibrium at 20 °C and 65 % RH, and the resulting moisture content is determined. The thickness swelling after immersion in water is also measured, providing data that Czech furniture manufacturers use to select the correct board grade for kitchens, bathrooms and humid environments.
- Water absorption and swelling pressure of chemically modified wood: acetylated, furfurylated and thermally modified timbers intended for outdoor decking and cladding are subjected to long-term immersion and vapour exposure to quantify the reduced hygroscopicity compared with untreated wood. These results support environmental product declarations and the marketing of sustainable building products on the Czech market.
Report Acceptance and Regulatory Compliance for the Czech Republic
All moisture absorption research testing described above is executed within the fully accredited scope of our ISO/IEC 17025 quality management system. Each test report carrying the ILAC mark is therefore recognised automatically by the Czech Trade Inspection Authority, the State Agricultural and Food Inspection Authority, customs offices and all notified bodies in the European Union. For Czech manufacturers, importers and specifiers, the report provides legally robust evidence that the declared hygroscopic properties are based on impartial, traceable measurements. The documentation can be directly used to support CE marking, to issue inspection certificates according to ČSN EN 10204, to compile Declarations of Performance under the Construction Products Regulation, and to resolve commercial or technical disputes concerning the moisture behaviour of materials and products.
