EN 302-2 Delamination Test for Load-Bearing Timber Adhesive

Information on the most widely used ASTM standards within the materials testing industry

Descriptions of the most prominent lSO standards within the materials testing industry

Standards including EN, DIN, JlS, and more

Mechanical testing of polymer materials in the automotive industry is directly related to the safety of components and the reliability of the entire vehicle. UnitedTest can cover mechanical performance testing for automotive interior and exterior parts, as well as functional components, adapting to automaker standards and providing comprehensive testing solutions including tensile, impact, and fatigue tests.

Mechanical testing in the battery industry determines the tensile and puncture resistance of core components such as separators and electrodes, directly affecting battery safety and cycle life. UnitedTest can cover full-dimensional mechanical testing of battery materials, compatible with national and international standards, and provide customized testing solutions.

Mechanical testing in the consumer goods industry determines product durability and safety, such as impact resistance for toys and fatigue resistance for home appliances, making it core to compliance and quality. UnitedTest can cover mechanical tests for all categories of consumer goods, including tensile, impact, and hardness tests, compatible with national and international standards, and offers customized testing solutions.

In the field of medical and biomedical sciences, mechanical testing determines the safety and compatibility of implanted devices and biomaterials, making it a core part of regulatory approval. UnitedTest can cover a full range of tests including tensile, fatigue, and wear tests, compatible with national and international standards, and provides customized biomechanical testing solutions.

Material strength is a course that most engineering fields are required to study in university education. This interesting course is very practical and makes use of testing equipment in the materials laboratory.

Mechanical testing of industrial products and components is essential to ensure their load-bearing, fatigue resistance, and impact resistance, directly preventing production accidents and ensuring stable operation of equipment. UnitedTest can cover a full range of tests including tensile, hardness, and fatigue, complying with national and international standards, and provides customized industrial mechanical testing solutions.

Mechanical testing in the plastic pipe industry determines ring stiffness, impact resistance, and tensile performance, directly preventing pipe bursts and deformation risks. UnitedTest can cover full-dimensional mechanical testing of pipes, complies with ISO,ASTM,EN et.c, international standards, and provides customized testing solutions.

In the construction engineering and building materials industry, mechanical testing determines the compressive and tensile properties of materials such as concrete and steel, which is core to ensuring the safety and durability of buildings. UnitedTest can cover the full range of building material mechanical tests, complies with ISO, ASTM international standards, and provides customized testing solutions for compressive, tensile, and other properties.

Mechanical testing in the food and beverage industry involves the compressive and tensile performance of packaging and the safety of food texture, directly ensuring storage, transportation safety, and the eating experience. UnitedTest can cover all-dimensional mechanical testing for packaging and food texture, comply with national and international standards, and provide customized testing solutions.

Mechanical testing in the packaging industry determines the packaging's resistance to compression, impact, and tension, directly ensuring the safety of contents during storage and transportation. UnitedTest can cover comprehensive mechanical testing for packaging, complying with ISO, ASTM Standards, and provides customized testing solutions for compression, drop, tear, and more.

Mechanical testing in the transportation industry concerns the load-bearing and fatigue resistance performance of core components such as vehicles, tracks, and containers, directly ensuring transport safety and equipment durability. UnitedTest can cover mechanical testing for all types of transportation materials, complying with national and international standards, and provides customized testing solutions including tensile, fatigue, and impact tests.

Metallurgical testing examines the properties of metallic materials to determine if a particular metal is appropriate for its intended use.

Testing of polymer materials covers mechanical, thermal, and chemical properties, verifying strength, heat resistance, composition, and ensuring product quality and compliance.

UnitedTest offer world-class testing solution in testing for polymeric materials, including elastomers, thermoplastics, composites, coatings, and structural adhesives in a variety of industries.

Testing of rubber and elastomers is used to assess the various properties and performance of materials under different conditions. This is crucial for ensuring the safety, functionality, and quality of rubber and elastomer products used in industries such as automotive, construction, consumer goods, and aerospace.

Conduct adhesive testing using various testing methods to determine their performance and characteristics in applications across multiple industries such as aerospace, automotive, construction, packaging, industrial, medical, and energy, thereby supporting application development and quality assurance.

UnitedTest supply machine and testing solution for tension, compression, fracture toughness, direct shear, triaxial and ultrasonic velocity are common concrete and rock testing applications.

UnitedTest has helped a number of companies involved in the wood, paper, cardboard, and corrugated industry with their testing needs. Our materials testing systems are capable of testing raw materials, components, and finished products.

UnitedTest testing system is trusted by leading medical device manufacturers, universities, and medical research laboratories worldwide. Whether testing tissues or bioresorbable materials, stents, or sutures, UnitedTest offers a variety of single-actuator and dual-actuator systems to meet your biomedical testing needs.

Mechanical testing in the textile fabric industry determines core properties such as fabric tensile strength, tear resistance, and wear resistance, directly affecting product durability and safety. UnitedTest can cover comprehensive mechanical tests for textiles, complying with national standards / ISO standards, and provides customized testing solutions including tensile, tear, and puncture tests.

The mechanical testing of industrial components directly determines the load-bearing, fatigue resistance, and wear resistance of the parts, helping to avoid equipment failure risks. UnitedTest can cover a full range of tests including tensile, hardness, and fatigue, is compatible with ISO/ASTM/GB standards, and provides customized mechanical testing solutions for industrial components.

Mechanical testing in the glass-ceramics industry determines core properties such as flexural strength, hardness, and fracture toughness, directly helping to avoid brittleness and failure risks. UnitedTest can cover comprehensive testing for flexural strength, hardness, and fracture toughness, compatible with national and ISO/ASTM standards, and provides customized testing solutions.

Tensile test evaluates material resistance to stretching, measuring strength/elongation critical for quality control. UnitedTest offers universal tensile testers (10-600KN) compliant with ASTM/ISO standards, providing tailored solutions for metals, polymers, medical & industrial materials.

Compression test assesses material resistance to compressive loads, measuring strength/deformation critical for quality validation. UnitedTest offers compression testing machines compliant with ASTM/ISO standards, providing tailored solutions for concrete, plastics, metals and industrial components.

Flexural & Bend tests evaluate material resistance to bending forces, measuring strength, stiffness and ductility for quality assurance. UnitedTest provides flexural testing machines (3-point/4-point bend) compliant with ASTM/ISO standards, offering tailored solutions for composites, plastics, metals and construction materials.

Torsion Test evaluates material resistance to rotational forces, measuring torsional strength/ductility critical for fasteners, insulators, shafts. UnitedTest offers torsion testers compliant with ASTM A938/ISO 16047, providing tailored solutions for automotive, aerospace, fastener industries.

Fatigue Test assesses material durability under cyclic loading, critical for predicting service life of industrial components. UnitedTest offers fatigue testing systems (axial/bending/torsion) compliant with ASTM E466/ISO 12106, providing tailored solutions for automotive, aerospace and manufacturing sectors.

Peel Test measures material adhesion strength by evaluating resistance to peeling forces, critical for adhesives, films, packaging. UnitedTest offers peel testers compliant with ASTM D903/ISO 8510, covering 90°/180° peel tests, and tailored solutions for packaging, automotive, textile industries.

Impact Test evaluates material resistance to sudden shock loads, critical for assessing toughness and fracture risk. UnitedTest offers impact testers (Charpy/Izod/fall weight) compliant with ASTM E23/ISO 148, providing tailored solutions for metals, plastics, glass and industrial components.

Tear & Shear Test evaluates material resistance to tearing and shearing forces, measuring critical strength parameters for quality control. Tear tests (Elmendorf/trouser/trapezoidal) assess resistance to crack propagation in films/fabrics, while shear tests measure resistance to parallel forces in joints/bolts. UnitedTest provides universal testing machines (10KN-600KN) with specialized fixtures for both tests, compliant with ASTM D624/D3164 and ISO standards, serving automotive, packaging and construction industries.

Hardness test measures material's resistance to permanent indentation, critical for quality control. UnitedTest offers universal hardness testers (Rockwell/Brinell/Vickers) compliant with ASTM/ISO standards, plus tailored hardness testing solutions for diverse industrial needs.

Biaxial/triaxial tests evaluate material performance under multi-axis loads, critical for biomaterials, metals and composites. UnitedTest provides compliant testing machines (ASTM/ISO) for planar biaxial, static/fatigue triaxial tests, with tailored solutions for industrial & biomedical needs.

Friction and wear tests assess material resistance to friction, abrasion and wear, critical for industrial material performance validation. UnitedTest offers tribometers compliant with ASTM G99/ISO standards, covering pin-on-disk, four-ball tests, and tailored friction & wear testing solutions for diverse industries.

Pressure test evaluates material/component resistance to static/dynamic pressure, critical for sealing, strength and safety validation. UnitedTest offers pressure testing machines compliant with ASTM/ISO standards, covering burst, hold-pressure tests, and tailored solutions for industrial, automotive & medical sectors.

Fire test assesses material flammability, heat resistance and fire-retardant performance, critical for safety compliance across industries. UnitedTest offers fire testing equipment compliant with ASTM/ISO/UL standards, providing tailored fire test solutions for building materials, plastics and industrial components.

Non-destructive Test (NDT) evaluates material/component integrity without damage, critical for safety & quality across industries. UnitedTest offers ultrasonic/X-ray/magnetic particle NDT equipment compliant with ASTM/ISO standards, plus tailored NDT solutions for aerospace, automotive & manufacturing sectors.

Test Principle

The shear strength of adhesive bonds is determined by applying a longitudinal tensile force to a single lap joint with close contact or thick glue lines between two rectangular wooden adherents made of beech (Fagus sylvatica L.). The joints are loaded to rupture.

In practice: a 20 × 10 mm = 200 mm² bonded area is sheared in the grain direction; the failure load divided by 200 mm² gives the shear strength fᵥ.

Test Equipment required for EN 302-1 Wood Adhesive Longitudinal Tensile Shear Strength Test

Tensile testing machine

Two acceptable operation modes:

Mode A: constant loading rate (2.0 ± 0.5) kN/min;
Mode B: constant cross‑head speed complying with ISO 5893, adjusted so specimen failure occurs within 30–90 seconds; cross‑head speed shall not exceed 5 mm/min.

Hinged wedge grips

Firmly hold specimens without slippage during tensile loading, guaranteeing axial alignment of specimen long‑axis with load direction.

Wood‑working tools

Planer, saw, grooving cutter, abrasive paper P100 (ISO 6344‑2) for surface preparation of beech panels.

Test Specimen Information:

Substrate wood

Species: beech (Fagus sylvatica L.), untreated, straight-grained

Density (700 ± 50) kg/m³ at (12 ± 1) % moisture content

Angle α between annual rings and the bonding surface: 30°–85°; the two panels are assembled with annual rings forming a "herringbone pattern".

Panel preparation

Panels planed, with or without ≈ 14 mm wide grooves; cut to ≥ 300 mm (with cross-cut allowance) × ≥ 130 mm (with width-of-cut allowance)

Close contact: two panels of (5.0 ± 0.1) mm

Thick glue line: one (5.0 ± 0.1) mm panel + one [(5.0 ± 0.1) + h] mm grooved panel; for h > 1 mm, two grooved panels of (5.0 ± 0.1) + h/2 may be used

Grooves: depth h = 0.3 / 0.5 / 1.0 / 2.0 / 4.0 mm, width ≈ 14 mm, ending 5 mm from the side edges

Bonding

Not more than 24 h before bonding, lightly plane or lightly sand each bonding surface with P100 abrasive; remove dust; do not touch or soil the surfaces

For thick glue lines, only pre-mixed adhesives are suitable

Clamping pressure (0.8 ± 0.1) N/mm² uniformly distributed, or as recommended by the manufacturer

Exception: specimens with bond line > 1 mm for adhesive type GF (per EN 301, EN 17334, EN 17418) shall be produced pressureless — a narrow slot (~2 mm wide, ~2 mm deep) between groove end and adherent edge is a recommended method

Test piece geometry

Cut five strips of width b = (20.0 ± 0.1) mm along the grain, avoiding the outer 7.5 mm of the panel edges; cut to length l₁ = (150 ± 5) mm; distribute test pieces from one board randomly among treatment classes

Cut flat-bottomed notches of (2.5 ± 0.5) mm width across the grain so that an overlap l₂ = (10.0 ± 0.1) mm is defined in the middle section, centred in the groove for thick glue lines; the cut must separate the wood and adhesive layers but must not go beyond the adhesive layer.

Key derived value: A = bonded test surface = b × l₂ = 20.0 × 10.0 = 200 mm², and the notches are what force failure to occur inside this defined 200 mm² overlap.

Test Parameters & Stipulations

A – bonded test surface	200 mm² (20.0 × 10.0 mm)
fᵥ – shear strength	N/mm² (MPa)
Fₘₐₓ – applied load at failure	N
l₁ – test piece length	(150 ± 5) mm
l₂ – overlap / tested length	(10.0 ± 0.1) mm
b – test piece width	(20.0 ± 0.1) mm
t – panel thickness (close contact)	(5.0 ± 0.1) mm
h – groove / thick glue line depth	0.3, 0.5, 1.0, 2.0, 4.0 mm
l₃ – groove width	≈ 14 mm
α – annual ring / glue line angle	30°–85°
Close contact glue line	≤ 0.1 mm (achieved with (0.8 ± 0.1) N/mm² pressure, no spacers)
Thick glue line	nominal 0.3 – 4.0 mm
Notch width	(2.5 ± 0.5) mm
Wood density / MC	(700 ± 50) kg/m³ at (12 ± 1) %
Standard climate [20/65]	(20 ± 2) °C, (65 ± 5) % RH
Clamping pressure	(0.8 ± 0.1) N/mm²
Rate of loading	(2.0 ± 0.5) kN/min, or ≤ 5 mm/min with failure in 30–90 s
Grip separation (opposite grip ends)	50 – 90 mm
Post-bonding conditioning	7–14 days; cutting not before 3 days
Valid results required	10 per treatment
Wood failure estimate	to the nearest 10 %
Reporting precision	0.1 N/mm²

Test Procedures for EN 302-1 Wood Adhesive Longitudinal Tensile Shear Strength Test

Panel preparation: Plane beech timber into panels; machine grooves if thick glue‑line specimens are needed. Condition raw panels under standard climate.
Bond assembly preparation: Sand/plan bonding surfaces ≤24 h before gluing, remove dust. Apply adhesive following manufacturer instructions (mixing, open‑time, assembly pressure). Assemble panels under defined pressure to form bonded assemblies for close‑contact or thick glue‑line joints.
Post‑bond conditioning: Store bonded assemblies for 7‑14 days under standard climate (minimum 3 days curing before cutting specimens).
Machine test‑pieces: Saw bonded panels into b=20mm strips; cut strips into 150‑mm long specimens. Mill cross‑grain notches to create the 10‑mm single‑lap overlap joint.
Pre‑test conditioning: Subject specimens to one pre‑treatment (A1‑A8) according to test scheme.
Mechanical tensile‑shear test: Mount specimen in hinged testing‑machine grips, apply tensile load at specified rate until fracture; record maximum failure load. Assess wood‑failure ratio visually.
Data processing: Calculate shear‑strength for each valid specimen; compute arithmetic mean, minimum value, standard deviation and coefficient of variation from first 10 valid replicates.

Industry Application Fields

Adhesive classification & CE/ETA/DoP support: compliance assessment against EN 301 (phenolic & aminoplastic), EN 15425 (1-component PUR), EN 16254 (EPI), EN 17334 (glued-in rods) and EN 17418 (2-component epoxy/PUR for on-site repair of cracked timber).
End-use sectors: glulam and CLT manufacturers, finger-jointing plants, structural timber and LVL producers, glued-in rod connections (e.g. moment-resisting timber joints), and on-site structural repair / strengthening with injected epoxies.
Users: adhesive manufacturers (R&D, batch QC), accredited testing laboratories and certification bodies, glulam/CLT producers for incoming-material verification, specifiers and procurement (minimum shear strength + wood failure in specifications), and researchers benchmarking new bio-based or filled adhesive formulations.
Regulatory context: published in support of EN 1995 (Eurocode 5) — the design code assumes durable bond integrity, and EN 302-1 is the evidence base for that assumption.

Related Stadard:

ISO 6237	Adhesives - Wood-to-wood adhesive bonds - Determination of shear strength by tensile loading
EN 205	Adhesives - Wood adhesives for non-structural applications - Determination of tensile shear strength of lap joints
ASTM D906	Standard Test Method for Strength Properties of Adhesives in Plywood Type Construction in Shear by Tension Loading
ASTM D4680	static shear creep
ASTM D2339	strength properties of adhesives in two-ply wood construction in shear by tension loading (birch veneer; wood failure per ASTM D5266)
ASTM D3931	gap-filling adhesives under compression
GB/T 33333	Determination of shear strength by tensile loading in wood adhesives
EN 302-1	Adhesives for load-bearing timber structures - Test methods - Part 1: Determination of longitudinal tensile shear strength
EN 302-2	Adhesives for load-bearing timber structures - Test methods - Part 2: Determination of resistance to delamination
ISO 6238	Adhesives - Wood-to-wood adhesive bonds - Determination of shear strength by compressive loading
ASTM D905	Standard Test Method for Strength Properties of Adhesive Bonds in Shear by Compression Loading

Keywords: EN 302-1,load-bearing timber structure adhesive test,longitudinal tensile shear strength tester,timber single lap joint shear test,beech wood adhesive bond test,close contact glue line test,thick gap joint test,timber adhesive climatic classification test,glulam adhesive shear strength test,wood structural adhesive tensile tester,UnitedTest timber adhesive testing machine,timber bonding quality control test,load bearing wood glue lab tester,wood adhesive qualification test,glue line shear strength testing instrument

A single column tensile tester is a sophisticated material testing instrument designed for measuring mechanical properties of various materials under tension, compression, bending, shear, and other loading conditions. As the name suggests, it features a single vertical column supporting a moving crosshead that applies force to test specimens.

Vice Tensile test fixture for plastics is based on the test standatd ASTM D638, determination of the tensile properties of unreinforced and reinforced plastics in the form of standard dumbbell-shaped test specimens when tested under defined conditions of pretreatment, temperature, speed.

We offer customization to meet your specific needs. Our expert team will collaborate with you to develop the perfect product for you