ASTM D2339 Two-Ply Wood Adhesive Shear-by-Tension Loading Test | UnitedTest Manufacturer Tension Shear Tester

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ASTM D2339 Wood-to-Wood Adhesive Shear Tester | UnitedTest

ASTM D2339 measures comparative shear strength of wood-to-wood adhesives using notched two-ply veneer specimens under axial tension loading. UnitedTest manufactures ASTM D2339 compliant adhesive shear testing machines for wood construction adhesive qualification.

ASTM D2339 Standard Test Method for Strength Properties of Adhesives in Two‑Ply Wood Construction in Shear by Tension Loading

ASTM D2339 defines a laboratory test to obtain comparative shear-strength data for wood-to-wood adhesives. This standard is exclusive to adhesives bonding wood to wood, using tensile loading to create shear stress across the adhesive bondline of two-ply veneer assemblies. Axial tensile force is applied to a precisely notched two-ply wood specimen. Two saw kerfs are machined down to the bondline, concentrating shear stress on the narrow bonded zone between grooves and triggering shear failure along the adhesive joint. UnitedTest supplies fully compliant testing equipment for ASTM D2339 wood adhesive shear strength evaluation, ideal for wood product R&D, formulation screening and quality control laboratories.

Test Principle:

Two thin veneer plies are glued with parallel grain to form a two‑ply panel. After curing and conditioning, specimens are cut and grooved so the bonded area is defined between saw kerfs/notches. Each specimen is mounted in tension‑load grips; the loading geometry puts the adhesive line in shear. At failure the peak load is recorded, shear stress is calculated as load ÷ shear area, and the percentage of wood‑failure (fibrous tear versus adhesive failure) is estimated separately.

“Shear” here follows ASTM D907/D1038: stress/strain/failure from forces that cause adjacent planes to slide parallel and opposite. The method gives comparative, not absolute, bond strength because wood strength, moisture, alignment and specimen geometry all influence results.

Test Specimen Information

Base veneer substrate

Standard veneer: 1.6 mm thick rotary‑cut or sliced sweet birch (Betula lenta) or yellow birch (Betula alleghaniensis). Other wood species/thickness are allowed by written agreement between adhesive purchaser and manufacturer.
Veneer requirement: free of knots, cracks, distorted grain, decay discoloration; no sanding. Grain directions of two veneer plies are parallel after assembly.
Pre‑test veneer moisture: conditioned within ±1 % of adhesive‑manufacturer recommendation; default target is 10‑12 % moisture content (oven‑dry basis) if no supplier guideline.

Final test‑specimen geometry

Saw kerf width: 0.32 cm (1/8 in), machined to exactly reach bondline.
Shear bond width between two grooves: 2.54 cm (1 in).
Specimen height: 8.26 cm (3‑1/4 in).
Sample quantity: minimum 30 test specimens, sourced from at least three separate bonded test panels.
Specimens shall stay inside conditioning environment except during cutting preparation.

Test Equipment of ASTM D2339 Two-Ply Wood Adhesive Shear-by-Tension Loading Test

Tensile testing machine:	Capable of controlled loading rate. Load rate shall be controlled between 4.535–7.560 kg/s (600‑1000 lb/min). If cross‑head displacement control is used, select cross‑head speed to achieve this average loading rate.
Specimen grips and jaws	special aligned gripping fixtures to hold specimens firmly and maintain axial alignment during tension loading.
Controlled‑environment test room	Maintain stable temperature‑humidity to avoid changing specimen moisture content throughout testing.
Tools	1. Cutting & grooving tools: veneer saw, hollow‑ground grooving saw to produce precise saw kerfs reaching exactly to bondline without cutting through adhesive layer. 2. Measuring instruments: calipers reading to 0.25 mm for specimen dimension measurement, for calculating shear area. 3. Moisture measurement equipment: conforming to ASTM D4442 for wood moisture‑content checking.

Key Test Parameters and stipulations:

Loading rate: 4.535–7.560 kg/s (600‑1000 lb/min) load application rate.

Panel conditioning after pressing: 23 ±1 °C, 50 ±2 % relative humidity. Hold for 7 days minimum or until weight equilibrium, whichever takes longer; extended time permitted upon written agreement.

Wood‑failure rating: estimate to nearest 5 % following ASTM D5266 practice for each broken sample.

Test Procedures of ASTM D2339 Two-Ply Wood Adhesive Shear-by-Tension Loading Test

Prepare veneer panels: Cut veneer sheets; condition veneer to target moisture content, verify moisture by ASTM D4442. Mix adhesive per manufacturer instructions. Apply adhesive as specified, follow open‑assembly waiting time. Assemble two‑ply panels with parallel grain; follow closed‑assembly time, then press under manufacturer‑specified pressure‑temperature‑time conditions.
Condition bonded panels: Remove from press and condition under 23 °C /50 %RH for minimum 7 days or weight equilibrium (longer governs).
Machine test specimens: Groove and cut specimens as per Figure 2 and Figure 3 of standard. Measure each specimen’s width and groove‑to‑groove distance for shear‑area calculation. Keep specimens in conditioning environment before test.
Mount specimen in test machine: Clamp tightly, ensure perfect axial alignment. Alternate notch‑left / notch‑right orientation for successive specimens.
Conduct tension‑shear test: Run test under defined loading rate; record failure load in newtons (or pounds‑force).
Evaluate failure mode: Assess wood‑failure percentage for each fractured specimen according to ASTM D5266 method.
Calculation: Compute peak shear stress (kPa or psi) for each specimen: shear stress = failure load ÷ measured shear area.
Report test results: Report adhesive information, wood species and moisture, bonding conditions, specimen dimensions, conditioning parameters, test‑room temperature‑humidity, number of specimens/panels, max/min shear stress, average shear stress, average wood‑failure percentage; optionally report standard deviation or all individual values.

Industry / Application Fields

This test serves wood‑adhesive R&D, factory quality‑control, and material‑performance specification workASTM Inter.... It applies for wood‑based industries: veneer‑based wood products, plywood‑related materials, laminated two‑ply wood assemblies, structural and non‑structural wood‑bonding adhesive qualification. It provides comparative performance ranking among wood‑to‑wood adhesives for product development, incoming‑material inspection, procurement specification verification.

Related & Similar Standards

ASTM D906	Shear‑strength test for plywood‑type multi‑ply wood construction under tension loading (closely related, for plywood assemblies rather than two‑ply)
ASTM D5266	Practice to estimate wood‑failure percentage of bonded joints (normative reference).
ASTM D4680	Static‑shear creep test of wood‑adhesive under compression loading (evaluates long‑term creep performance instead of short‑term ultimate shear strength)
ASTM D3931	Shear test for gap‑filling wood adhesives under compression loading, different loading mode and target adhesive type.
ASTM D2339	Standard Test Method for Strength Properties of Adhesives in Two-Ply Wood Construction in Shear by Tension Loading
ASTM D905	wood adhesive shear by compression loading using block/lap specimens; complementary to D2339 when compression shear is preferred.
ASTM D1101	integrity of adhesive joints in structural laminated wood products for exterior use
ISO 6238	Adhesives - Wood-to-wood adhesive bonds - Determination of shear strength by compressive loading
EN 302	Series for wood adhesives—shear strength, delamination and durability

Why the Test Is Important for the Material

Performance screening: shear along the glue line is the dominant failure mode in two‑ply/veneer wood assemblies; D2339 gives a repeatable comparative number for formulation changes, resin batches and process settings.

Process control: because bond result depends on spread, open/closed assembly, pressure, cure temperature and wood moisture, the method exposes whether a manufacturing parameter—not just the adhesive chemistry—is causing weak joints.

Specification compliance: buyers and engineers can specify minimum average shear stress and wood‑failure percentage instead of relying on adhesive brand claims.

Failure‑mode insight: reporting wood failure % prevents misinterpretation. High shear with low wood failure may mean the wood substrate, not the adhesive, controlled the result; low shear with high wood failure often means the wood, not the glue, was the limiting material. D2339 therefore separates “adhesive problem” from “substrate/process problem.”

Laboratory comparability: fixed veneer species, conditioning, geometry and load rate reduce lab‑to‑lab variability even though absolute bias can remain; this supports supplier qualification, audits and R&D benchmarking.

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WDW Series Computer Control Electronic Universal Testing Machine made by UNITEDTEST range from 100N to 600KN load capacity with various models like single columns, table type, door frame type etc., is used to perform tension, compression, flexure/bending, shearing, peeling etc., test for metal and nonmetal specimens.

Snubbing and Capstan grips are all engineered to perform high strength tensile tests where the test samples are long compared to their cross-sectional area, such as wire, rope and strapping.

Q1: What is ASTM D2339‑20, and why is this test important for wood‑adhesive materials?

A: ASTM D2339‑20 is an ASTM standard test method measuring shear strength of wood‑to‑wood adhesives for two‑ply veneer assemblies under tension loading. It is critical because shear loading is the most common real‑world stress for bonded wood joints. This test delivers repeatable comparative bond‑strength data for adhesive R&D, factory QC, and procurement specifications. It also evaluates wood‑failure percentage, which tells engineers whether failure occurs inside wood substrate or inside adhesive layer. High wood‑failure ratio proves the adhesive bond is stronger than wood itself.

Q2: What specimens are required for ASTM D2339‑20? Can I use any wood species?

A: Standard substrate is 1.6 mm sweet birch or yellow birch rotary‑cut/sliced veneer, no sanding allowed. Other wood species or veneer thickness are permitted only by written agreement between adhesive buyer and manufacturer. Minimum sample requirement: 30 specimens sourced from minimum three separate bonded two‑ply panels. Two veneer plies must be assembled with parallel grain orientation. Target veneer moisture is 10‑12 % (oven‑dry basis) unless adhesive supplier specifies other values.

Q3: What is wood‑failure percentage, and why must we report it for D2339 test report?

A: Wood‑failure percentage estimates how much fracture area happens inside wood substrate rather than along adhesive bondline, evaluated following ASTM D5266 practice to nearest 5 % increment. Shear‑strength value alone cannot fully judge adhesive quality. If high shear‑stress value comes with zero‑percent wood failure, failure occurs completely at glue interface and indicates poor bonding performance. Both average shear strength and average wood‑failure percentage are compulsory report items in D2339‑20 test report.

Q4: What is the difference between ASTM D2339‑20 and ASTM D906‑20? Users often mix these two standards.

A: ASTM D2339‑20: Two‑ply wood assembly (only 2 veneer layers), tension‑loaded shear test.

ASTM D906‑20: Plywood‑type multi‑ply construction (more than two veneer plies) for plywood product testing, also tension‑shear loading. D2339 targets simple two‑ply lab panels for adhesive screening & formulation work. D906 applies for real multi‑layer plywood performance qualification. They share similar loading principle but different specimen construction.

Q5: Why does the standard mention alternating notch direction when mounting specimens?

A: Test operators shall mount specimens alternately: one sample upper notch to left, next sample upper notch to right. This procedure offsets fixture‑system bias and asymmetric stress distribution, reducing systematic measurement error across specimen batch. Strict axial alignment is required: imaginary vertical line must pass through bondline and fixture suspension points to avoid bending stress on joint.

Q6. What causes invalid or inconsistent D2339 results?

A: Saw kerfs extending beyond the bondline or not reaching it

Misaligned grips so the specimen is not in pure shear

Wrong load rate outside 600–1000 lb/min

Veneer moisture drift before bonding or during conditioning

Weak/low‑density species causing tensile failure at kerfs instead of glue‑line shear (remedy: thicker veneer or reduce groove spacing to 12.7 mm/0.5 in)

Subjective wood‑failure reading—use consistent lighting and, if possible, two assessors.

Q7: Why choose ASTM D2339 Wood Adhesive Shear Tester, Two‑Ply Veneer Tensile Shear Machine from UnitedTest?

A: UnitedTest manufactures ASTM D2339‑20 compliant universal testing machine & custom grips for two‑ply wood construction shear‑by‑tension loading test. Evaluate wood‑to‑wood adhesive shear strength and wood‑failure percentage for adhesive R&D, QC and third‑party lab testing.

UnitedTest is a professional manufacturer supplying fully‑compliant test machines and dedicated fixture kits for ASTM D2339‑20 Standard Test Method for Strength Properties of Adhesives in Two‑Ply Wood Construction in Shear by Tension Loading\.

ASTM D2339‑20 is the key laboratory method to characterize shear performance for wood‑to‑wood adhesives using notched two‑ply birch veneer specimens under axial tension force. It is widely adopted by adhesive factories, wood‑product manufacturers and independent testing labs for adhesive formulation development, production quality control, and material‑specification validation. The test measures ultimate shear strength and wood‑failure ratio to judge real‑world bond reliability of wood‑bonding glues.

UnitedTest ASTM D2339‑20 Complete Solution Includes:

Universal Tensile‑Testing Mainframe: Servo‑controlled load frame, precisely adjustable loading rate covering required 4.535‑7.560 kg/s load application range, high‑accuracy load cell.
Custom‑made D2339 special aligned grips & jaw assembly: Designed following standard Figure 1 drawing, guarantee specimen axial alignment and eliminate bending‑moment error during tension‑shear test.
Test software module: Supports automatic peak‑load capture, shear‑area input, shear‑stress calculation (kPa / psi), wood‑failure‑rate logging, batch‑data statistics and standard‑compliant report output.
Technical support: Specimen‑making guidance, conditioning parameter suggestions, fixture installation training, on‑site or remote commissioning service.

Who benefits from UnitedTest ASTM D2339‑20 test equipment:

Wood‑adhesive R&D labs for new glue formulation screening
Veneer, plywood, laminated‑wood manufacturing for in‑house quality control
Third‑party accredited testing laboratories
Construction‑material procurement verification
Bio‑based adhesive & water‑based wood glue qualification testing

Related standards our system also supports:

ASTM D906, ASTM D5266, ASTM D4442, ASTM D907, ASTM D1038 and other wood‑adhesive mechanical test standards.

If you need reliable ASTM D2339‑20 test setup for your lab, contact UnitedTest engineers for fixture customization, machine selection guide and quotation.

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