Polyurethane adhesive testing service

Polyurethane Adhesive Testing Service for Global Bonding and Sealing Applications

As an ISO/IEC 17025 accredited laboratory, we deliver a comprehensive polyurethane adhesive testing service that verifies mechanical strength, thermal stability, chemical resistance, curing behavior, and long-term durability. Our polyurethane adhesive testing service supports manufacturers and exporters of one-component and two-component PU adhesives, sealants, and structural bonding systems who must demonstrate conformity to ASTM, ISO, EN, and regional construction and industrial standards across the European Union, North America, the Middle East, and Asia. Every test is performed under our CNAS-accredited quality system, producing reports accepted by notified bodies, engineering authorities, and procurement teams worldwide.

Product Samples We Regularly Test in Our Polyurethane Adhesive Testing Service

One-component moisture-cure polyurethane adhesives — for construction, wood bonding, and general industrial assembly
Two-component polyurethane structural adhesives — for automotive, marine, and composite bonding applications
Polyurethane sealants and caulking compounds — for expansion joints, facade sealing, and waterproofing
Hot-melt polyurethane adhesives and reactive PUR systems — for lamination, edge banding, and high-speed assembly
Polyurethane foam adhesives and gap-filling bonding systems — for insulation panels, door frames, and construction joints
Flexible and elastomeric polyurethane adhesives — for flooring, footwear, and textile lamination
Conductive and thermally conductive polyurethane adhesives — for electronics assembly and heat dissipation

Mechanical and Bonding Performance Testing in Our Polyurethane Adhesive Testing Service

Lap shear strength of bonded assemblies per ISO 4587 and ASTM D1002 — single-overlap metal, wood, or plastic specimens are pulled to failure to measure the ultimate shear stress, providing the primary design value for polyurethane adhesive joints in load-bearing applications.
Tensile strength and elongation of the cured neat adhesive per ISO 527-2 and ASTM D638 — dog-bone specimens are cast and tested to determine the ultimate tensile strength, modulus, and percentage elongation, defining the cohesive properties and the flexibility of the polyurethane adhesive.
Peel resistance by T-peel and floating roller peel per ISO 4578 and ASTM D1876 — the force required to separate a flexible adherend from a rigid substrate is measured, quantifying the polyurethane adhesive's resistance to peeling stresses in panel bonding and flexible circuit reinforcement.
Compressive strength and modulus per ISO 604 and ASTM D695 — the cured polyurethane adhesive is compressed to failure to ensure adequate load-bearing capacity in anchoring, grouting, and structural bearing applications.
Flexural strength and modulus per ISO 178 and ASTM D790 — three-point bending of cast polyurethane beams provides data on the adhesive's stiffness and ability to resist bending, essential for bonded structures subjected to flexural loads.
Impact resistance by Charpy and Izod methods per ISO 179-1 and ASTM D256 — the energy absorbed during high-speed fracture is measured to ensure the cured polyurethane adhesive withstands accidental impacts and dynamic loading without brittle failure.
Creep and stress relaxation in shear and tension per ISO 899 and ASTM D2990 — the long-term deformation of bonded joints under sustained load is measured to predict the time-dependent behaviour of polyurethane adhesives in structural applications over the design service life.

Thermal and Curing Behavior Characterization for Polyurethane Adhesives

Glass transition temperature by differential scanning calorimetry per ISO 11357-2 and ASTM E1356 — the cured polyurethane sample is heated at a controlled rate and the Tg is identified from the step change in heat flow, defining the maximum continuous service temperature for the bonded assembly.
Thermal stability and filler content by thermogravimetric analysis per ASTM E1131 and ISO 11358-1 — the mass loss profile up to 900 °C quantifies the organic polyurethane content, carbon black, and inorganic filler fraction, verifying batch consistency and predicting decomposition temperatures.
Dynamic mechanical analysis for modulus and damping behaviour per ISO 6721-1 and ASTM D4065 — the storage modulus, loss modulus, and tan delta are measured across a temperature sweep, providing the viscoelastic fingerprint of the polyurethane adhesive that governs energy dissipation and stiffness under dynamic service conditions.
Coefficient of thermal expansion by thermomechanical analysis per ISO 11359-2 and ASTM E831 — the linear expansion of the cured adhesive is measured to ensure compatibility with the adherends and to prevent interfacial stress from differential thermal movement.
Mixed viscosity, thixotropy, and open time of the uncured adhesive per ISO 3219 and ASTM D2196 — rotational viscometry and thixotropic loop tests define the flow, sag resistance, and open time of the polyurethane adhesive, guiding application method selection and workability under production conditions.
Gel time, tack-free time, and cure exotherm per ASTM D2471 and internal protocols — the temperature rise and gelation point of the reacting polyurethane system are recorded to confirm that the cure profile matches the supplier's recommendations and to prevent thermal runaway in large-scale castings.

Chemical Durability and Environmental Aging Testing for Polyurethane Adhesives

Chemical immersion resistance in acids, alkalis, fuels, and solvents per ASTM D543 and ISO 175 — cured polyurethane specimens are immersed in a range of aggressive fluids at defined temperatures, and the change in mass, hardness, and mechanical properties is measured to verify compatibility with the intended service environment.
Hydrolytic stability and hot water resistance per ASTM D3137 and ISO 2440 — the polyurethane adhesive is immersed in water at temperatures up to 100 °C for extended periods, then the retained shear strength and Tg are retested to predict performance in humid, wet, and underwater bonding applications.
Neutral salt spray and cyclic corrosion resistance of bonded joints per ISO 9227 and ASTM B117 — bonded metal lap-shear specimens are exposed to continuous or cyclic salt fog for up to 2000 hours, and the residual strength and failure mode are evaluated to detect interfacial corrosion-induced adhesion loss.
Accelerated weathering by xenon-arc and fluorescent UV per ISO 4892-2 and ASTM G155 — the polyurethane adhesive or sealant is subjected to simulated sunlight, heat, and moisture to evaluate colour stability, surface chalking, and gloss retention for outdoor and architectural applications.
Resistance to hydraulic oils, lubricants, and de-icing fluids per ASTM D471 — the polyurethane adhesive is tested with common industrial and transportation fluids to ensure that accidental spills or continuous contact do not plasticize or weaken the bonded joint.
High-temperature and thermal aging in air per ASTM D573 and ISO 188 — the adhesive is aged at elevated temperatures and the retained lap shear strength and elongation are measured to predict the thermal endurance and to establish the maximum continuous service temperature rating.

Electrical Insulation and Conductivity Testing for Polyurethane Adhesives

Dielectric strength and breakdown voltage per IEC 60243-1 and ASTM D149 — the cured polyurethane adhesive film is subjected to an increasing AC or DC voltage until electrical failure, determining the dielectric strength in kV/mm required for insulation in electronic encapsulations and potting compounds.
Volume and surface resistivity per IEC 60093 and ASTM D257 — the electrical resistance through and across the cured polyurethane is measured at 500 V DC to verify that the adhesive meets the insulation resistance specification for the intended electronic or high-voltage application.
Dielectric constant and dissipation factor per IEC 60250 and ASTM D150 — the relative permittivity and loss tangent are measured at specified frequencies to characterize the polyurethane adhesive's behaviour as an insulator in high-frequency and signal integrity applications.
Comparative tracking index per IEC 60112 — the resistance of the cured polyurethane surface to tracking under voltage and contamination is determined to ensure safety in creepage-critical printed circuit board and connector encapsulations.
Arc resistance per ASTM D495 — the ability of the polyurethane adhesive to resist forming a conductive path under a high-voltage, low-current arc is measured for switchgear and high-voltage component insulation.

Flammability and Restricted Substance Compliance for Polyurethane Adhesives

UL 94 vertical and horizontal flame classification per ASTM D3801 and IEC 60695-11-10 — the cured polyurethane is exposed to a defined flame and the afterflame time and burning rate are recorded to classify the material as V-0, V-1, V-2, or HB for electrical enclosure and consumer product applications.
RoHS compliance per IEC 62321 and EU Directive 2011/65/EU — quantitative screening for lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers in the uncured and cured polyurethane resin adhesive.
REACH Annex XVII and SVHC screening — analysis of Substances of Very High Concern including restricted amine hardeners, phthalate plasticizers, and short-chain chlorinated paraffins that may be present in the polyurethane formulation.
Volatile organic compound content and odor per ASTM D6886 and ISO 11890-2 — the VOC content of the liquid polyurethane adhesive is measured to ensure compliance with EU Solvent Emissions Directive and LEED requirements for low-emitting adhesives and sealants.
Migration and extractables for food and potable water contact per EU Regulation 10/2011 and BS 6920 — the cured polyurethane is tested for overall migration into food simulants and for specific migration of restricted amines and plasticizers to confirm suitability for indirect food contact and drinking water system applications.

Report Recognition and ISO/IEC 17025 Compliance

Every method described in this polyurethane adhesive testing service is covered by our ISO/IEC 17025 scope of accreditation. Our test reports are accepted by European notified bodies for construction products and pressure equipment, by North American transportation and engineering authorities referencing ASTM and AASHTO standards, and by customs and regulatory agencies across the Middle East, Australia, and Asia. Whether you require a complete qualification dossier for a new polyurethane adhesive formulation, a batch release inspection for an export shipment, or a root cause failure investigation of a bonded joint, our laboratory provides the measurement accuracy and technical expertise that the global adhesives and sealants industry demands.