EN 14293 Parquet Flooring Adhesive Tensile Shear Test

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EN 14293 Parquet Flooring Adhesive Tester | Shear & Tensile Strength Test Machine | UnitedTest

UnitedTest manufactures EN 14293 testing machine for parquet-to-subfloor adhesives. This equipment measures shear strength, tensile strength and open time, supports both hard and soft parquet adhesive categories for wood flooring adhesive lab qualification and quality control.

EN 14293 defines standardized laboratory test methods and minimum performance requirements for adhesives formulated to bond parquet and similar wood flooring materials onto subfloors. It covers tensile strength, shear strength assessment and open time determination, featuring two separate shear testing procedures plus differentiated performance thresholds for hard adhesives and soft adhesives. This standard only addresses laboratory material evaluation; it does not cover parquet flooring selection or on-site installation guidance, widely used for construction adhesive certification, flooring adhesive R&D and factory batch inspection.

Hard adhesive	shear elongation factor < 2
Soft adhesive	shear elongation factor ≥ 2
Shear elongation	deformation of the unit thickness of an adhesive under shear force

The six test methods

1, Rib‑height determination after defined time
Test Principle	Adhesive is combed onto a glass base plate with a defined trowel. After 2 min a glass testing plate is laid into the ribs at a defined angle and pressed down. The wetted distance X on that plate is a measure of how high/fluid the ribs still are (i.e. whether the adhesive still wets and flows after standing).
Test Equipment	Notched trowel a = b = c = 5.0 ± 0.2 mm; timer (1 s); glass testing plate ~150 × 100 × 2 mm with a bonded metal/glass rod ~100 mm long, Ø 4 ± 0.05 mm; glass base plate ~300 × 300 × 4 mm; ruler readable to 1 mm; self-adhesive tape.
Test Result	X (mm) — representative of rib height. Informative only (no pass/fail limit).
Test Procedure	Two parallel tape strips mask the base plate leaving a ~70 mm unmasked band; trowel held vertical, spread from tape to tape; strips removed immediately; after 2 min ± 15 s lay the testing plate parallel to the ribs and press down without sliding until it touches the base plate on both support lines; measure X (mm) as the mean over all ribs.
2, Shear strength (hard adhesives) — mandatory route 1
Test Principle	Two mosaic parquet fingers are lap-bonded; after two different conditioning regimes the lap joint is pulled in a tensile machine until breakage; shear strength = F_max / bonded area.
Test Equipment	Notched trowel a = 3.6 ± 0.2 mm, b = 3.4 ± 0.2 mm, c = 3.4 ± 0.2 mm; 2 kg weights; timer (1 s); tensile testing machine with traverse (20 ± 2) mm/min, capacity 5–10 kN; air-circulating oven controlled to ± 2 °C.
Test Specimen info	Mosaic parquet finger per EN 13488, oak, approx. (140–165) mm × 23 mm × 8 mm; adhesive spread over ~800 mm² with ribs nearly perpendicular to the finger length; overlap bond area = 600 mm²; fingers parallel; each bond loaded with 2 kg ± 1 g for 60 s; 10 specimens per storage condition.
Test Procedure	Clamp 40–50 mm of each end in the jaws; load centrally and in the plane of the bond; pull to break; record F_max. T_S = F_max / A, A = 600 mm², reported to 0.1 N/mm².
3, Tensile strength (bond to the subfloor) — mandatory route 2
Test Principle	Parquet pieces are bonded to a concrete slab; after defined storage, metal pull-head plates are glued on and pulled off perpendicularly.
Test Equipment	Notched trowel (same 3.6 / 3.4 / 3.4 mm geometry); 2 kg weights; square steel pull-head plates (50 ± 1) × (50 ± 1) mm, min. 10 mm thick with a fitting that transmits no bending force; Tensile machine loading at (250 ± 50) N/s; oven ± 2 °C; high-strength adhesive (e.g. epoxy resin) for the pull heads.
Test Specimen info	Parquet pieces (50 ± 5) × (50 ± 5) × ~10 mm; standard concrete slab per EN 1323; pour ~300 g of adhesive, comb with trowel held at ~60° in a straight line; ≥ 10 pieces placed at ~50 mm spacing and each loaded with 2 kg. Bonded area 2 500 mm².
4, Maximum open time via shear strength (informative)
Test principle	Spread adhesive onto mosaic‑parquet fingers; assemble lap‑joint specimens at sequential waiting intervals (5 min, 10 min, 15 min, 20 min, 25 min, 30 min or longer). After curing for three days under standard climate, measure lap‑shear strength. Maximum open time = the longest waiting interval still delivering shear strength meeting the standard’s minimum requirement.
Test Procedure	After each pre‑defined open‑time delay, press matching parquet finger, apply 2 kg load for 60 s; cure total three days; perform tensile‑shear test and compute average shear strength for each delay interval.
Apparatus & specimen	Identical hardware and parquet lap‑joint geometry (600 mm² bond area) as clause 4.3. Five replicates for each waiting‑time level.
5, Maximum open‑time test via tensile‑pull‑off strength
Test principle	Spread adhesive over standard concrete slabs; place 50 × 50 mm parquet blocks onto adhesive at increasing open‑time intervals. Cure seven days total; attach pull‑head plates, perform normal‑direction pull‑off test. Maximum open time corresponds to the longest waiting time that still meets minimum tensile‑strength threshold.
Test Procedure	Lay parquet blocks at set delay points; apply 2 kg weight for 60 s; cure six days; attach pull‑head plates with high‑strength epoxy adhesive; condition further 24 h; execute pull‑off test at 250 ± 50 N/s loading rate.
Apparatus & specimen	Identical to clause 4.4; minimum five parquet‑block replicates for each open‑time interval.
6, Shear strength of soft adhesives (γ ≥ 2) — mandatory route 3
Test Principle	Soft adhesives have a much lower shear modulus, so the hard-adhesive limits cannot apply. Two fingers are lap-bonded with a defined ~1 mm adhesive gap; strength and elongation are measured so that the shear elongation factor can be calculated.
Test Equipment	Template; length-measuring instrument (or strain gauge) accurate to ± 0.1 mm; tensile machine (20 ± 2) mm/min, 5–10 kN; micrometer / slip gauge ± 0.1 mm.
Test Specimen info	Oak mosaic fingers; a template (plastic or similar, easy to clean) that guarantees a gap of (1 ± 0.3) mm and a bond area of 600 mm²; Adhesive applied with spatula over ~650 mm², layer > 1 mm; 10 specimens, left in the template ≥ 24 h, excess adhesive removed afterwards.
Result	T_S = F_max / A (A = 600 mm²) and γ = D_max / d, where D_max = elongation at F_max and d = measured gap thickness. Means of both are calculated; if the mean γ < 2, the adhesive must be re-tested as a hard adhesive per 4.3.

Industry Application Fields

Adhesive manufacturers (1K/2K polyurethane, silane-modified polymer/SMP, dispersion/PVAc, solvent-based, epoxy parquet adhesives): formulation R&D, benchmarking against competitors, and batch quality control / release testing.
Technical data sheets & marketing claims: figures such as "shear strength ≥ 3.5 N/mm² (EN 14293)" on parquet-adhesive TDS come directly from these methods; the classification hard vs. soft steers whether a product is sold as a rigid or elastic ("stress-relieving") parquet adhesive.
Independent testing laboratories and certification/approval bodies (national building-approval schemes, low-emission labels such as EMICODE/Blue Angel which require mechanical performance evidence alongside emission testing).
Flooring specifiers, architects, contractors: comparing products on a common basis, verifying suitability for heated screeds (the 40 °C ageing leg), large-format or dimensionally unstable wood, and checking that the declared open time is realistic for the crew's working speed.
Parquet / wood-flooring producers validating the adhesive–wood combination for their warranty systems.

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
GB/T 33333	Determination of shear strength by tensile loading in wood adhesives
ISO 6238	Adhesives - Wood-to-wood adhesive bonds - Determination of shear strength by compressive loading
EN 14293	Adhesives - Adhesives for bonding parquet to subfloor - Test methods and minimum requirements
ASTM D905	Standard Test Method for Strength Properties of Adhesive Bonds in Shear by Compression Loading
ISO 17178	Adhesives – Adhesives for bonding parquet to subfloor – Test methods and minimum requirements
EN 12004	ceramic tile adhesives: the same concrete-slab + pull-head-plate tensile adhesion approach; useful cross-reference if you work on both flooring and tiling adhesives.
EN 14257 / EN 14258	wood-adhesive heat-resistance (WATT 91) and shear-strength-at-elevated-temperature methods; relevant when thermal performance is the focus.

Keywords: EN 14293, parquet adhesive tester, wood flooring adhesive test machine, parquet to subfloor adhesive, adhesive shear strength test, adhesive tensile strength test, open time test for adhesive, hard parquet adhesive, soft parquet adhesive, timber flooring bonding adhesive, construction adhesive testing, parquet glue lab test, flooring adhesive qualification, adhesive bond strength tester, UnitedTest adhesive testing equipment, wood floor adhesive quality control, parquet adhesive certification test, subfloor bonding adhesive test

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.

Q1: What is EN 14293?

A: EN 14293:2006 is the European standard "Adhesives – Adhesives for bonding parquet to subfloor – Test methods and minimum requirements." Issued by CEN/TC 193 "Adhesives" (ICS 83.180), it defines the laboratory test methods and the minimum mechanical performance levels that parquet adhesives must reach, and includes a method for determining open time. It does not cover how parquet is selected or installed on site.

Q2: What exactly does the EN 14293 test measure?

A: Six things, grouped in Clause 4:

Rib height after a certain time (4.2) – an indicator of how the freshly combed adhesive bed keeps its structure/flow after 2 minutes.
Shear strength of hard adhesives (4.3) – lap-shear of two oak mosaic parquet fingers.
Tensile strength (4.4) – parquet blocks pulled off a standard concrete slab with bonded pull-head plates.
Maximum open time via shear strength (4.5).
Maximum open time via tensile strength (4.6).
Shear strength of soft adhesives (4.7) – with a defined 1 mm adhesive gap and measurement of the shear elongation factor γ.

Q3: Why is the EN 14293 test important for parquet adhesives?

A: Because wood is a "working" material. Parquet swells and shrinks with moisture and temperature, generating continuous shear stress at the adhesive–subfloor interface. EN 14293 proves quantitatively that a bond can (a) carry those stresses without delamination, bulging, cupping or gap formation, (b) stay bonded to the mineral screed, and (c) keep those properties after heat ageing at 40 °C (i.e. over underfloor heating). Without it, a "strong" adhesive claim is unverifiable and incomparable between suppliers.

Q4: What is the difference between "hard" and "soft" adhesives in EN 14293?

A: The split is made by the shear elongation factor γ (elongation at maximum force ÷ adhesive layer thickness):

Hard adhesive: γ < 2 → tested by method 4.3, minimum 3.5 N/mm² (28-day storage incl. 20 days at 40 °C) and 3.0 N/mm² (3 days at 23/50).
Soft adhesive: γ ≥ 2 → tested by method 4.7 at a 1 mm bondline, minimum 0.5 N/mm².
Soft adhesives are allowed to be much weaker because they relieve movement by elastic deformation instead of transferring stress into the wood and screed. If a mean γ < 2 is measured in 4.7, the product must be re-tested as a hard adhesive under 4.3.

Q5: What specimens are used?

Shear (4.3, 4.5, 4.7): oak mosaic parquet fingers to EN 13488, approx. (140–165) mm × 23 mm × 8 mm, lap-bonded with an overlap area of 600 mm².
Tensile (4.4, 4.6): oak parquet pieces (50 ± 5) mm × (50 ± 5) mm × ~10 mm bonded to a standard concrete slab per EN 1323; bonded area 2 500 mm²; square steel pull-head plates (50 ± 1) mm × (50 ± 1) mm, ≥ 10 mm thick.
Sample counts: 10 specimens per condition for shear/tensile strength; 5 specimens per waiting time for open-time series.

Q6: What equipment is needed to run EN 14293?

Universal/electromechanical tensile testing machine with closed-loop control: 5–10 kN capacity for the shear methods, and load-rate control at (250 ± 50) N/s for the pull-off methods.
Wedge/parallel grips able to clamp 40–50 mm of a wooden finger without crushing it; self-aligning pull-head coupling that transmits pure axial force (no bending).
Length/strain measurement to ± 0.1 mm (extensometer, strain gauge or a machine-mounted displacement device with mechanical error eliminated) for γ in method 4.7; micrometer or slip gauge ± 0.1 mm for the bondline thickness.
Air-circulating oven (± 2 °C) and a 23/50 conditioning room or chamber.
Notched trowels to the specified geometry, 2 kg calibration weights, timer (1 s), glass base and testing plates with a Ø 4 ± 0.05 mm rod, ruler (1 mm), spacer template for the 1 mm gap, high-strength epoxy for the pull heads.

Q7: What is "open time" and how is it determined?

A: Open time is the longest interval between combing the adhesive and laying the parquet into it, after which the bond still reaches the required strength. EN 14293 combs the adhesive once and lays specimens in after 5, 10, 15, 20, 25, 30 min or more (5 specimens per interval), stores them 3 days at 23/50, and then measures shear strength (4.5) or tensile strength (4.6). The longest waiting time that still meets the Table 1 minimum is the maximum open time, reported in minutes. It is informative data, but it is what installers actually feel on site.

Q8: Is the rib-height test (4.2) a pass/fail test?

A: No. It is explicitly informative, with no minimum requirement. It measures the wetted distance X on a glass plate laid into the ribbed adhesive bed 2 min ± 15 s after combing; X represents the effective rib height/wetting behaviour. It is reported in the test report and used for product characterisation and batch comparison.

Q9: How long does a full EN 14293 evaluation take?

A: Calendar time is dominated by conditioning: 3 days for the short shear regime, 28 days (7 d + 20 d at 40 °C + 1 d) for storage a) and for the soft-adhesive route, 7 or 28 days for tensile strength, plus 24 h for the epoxy-bonded pull heads. Practical planning: allow ~5–6 weeks for a complete data set including open-time series.

Q10: How is EN 14293 related to ISO 17178 / EN ISO 17178?

A: ISO 17178:2013 (adopted in Europe as EN ISO 17178:2020, e.g. DIN EN ISO 17178:2020-06) replaces EN 14293:2006-10. It keeps the same philosophy, specimen geometry (600 mm² lap area, 2 500 mm² pull-off area), rates (20 mm/min and 250 ± 50 N/s) and conditioning regimes, but refines the classification into hard / hard-elastic / elastic adhesives. Labs that own EN 14293 fixtures can normally be upgraded to EN ISO 17178 with minor fixture and software changes.

Q11: Can one universal testing machine do all EN 14293 methods?

A: Yes – the mechanical part of every method is a tensile or pull-off test on the same machine; only grips, fixtures and control mode change. You need: (i) a frame with ≥ 10 kN capacity and Class 0.5 / ISO 7500-1 force accuracy; (ii) closed-loop control so the machine can run both a constant crosshead speed of 20 ± 2 mm/min and a constant force rate of 250 ± 50 N/s; (iii) a self-aligning pull-head fixture for method 4.4/4.6; (iv) ± 0.1 mm elongation measurement for γ; and (v) an 40 °C oven / 23-50 conditioning chamber alongside. The trowels, 2 kg weights, glass plates and 1 mm spacer templates are laboratory consumables, not machine accessories.

Q12: What are the most common sources of error in EN 14293 testing?

A: (1) Bonding pressure/time not controlled (2 kg, 60 s); (2) bond area drifting away from 600 / 2 500 mm²; (3) eccentric loading or bending introduced by a non-self-aligning pull-head coupling; (4) ribs not perpendicular to the finger length; (5) removing excess adhesive from the 1 mm-gap specimens and disturbing the finger alignment; (6) uncontrolled conditioning temperature/humidity; (7) mixing up hard and soft classification because γ was never measured; (8) using a displacement reading from the crosshead instead of a ± 0.1 mm extensometer/strain gauge for γ.

Q13: Why should an adhesive be classified hard vs soft before quoting a strength value?

A: Because the acceptance level changes by a factor of seven (3.5 vs 0.5 N/mm²). A soft, elastic adhesive reported against the hard-adhesive limit looks like a failure; a rigid adhesive reported against the soft limit hides the fact that it will transfer stress into the wood. Testing both strength and shear elongation – as EN 14293 requires – is what makes a technical data sheet honest and comparable.

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