ISO 12625-5 Wet Tensile Strength Test for Tissue Paper | UnitedTest Wet Tensile Testing Machine

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ISO 12625-5 Tissue Paper Wet Tensile Strength Tester | UnitedTest

UnitedTest manufactures ISO 12625-5 compliant CRE tensile test machines for tissue paper and tissue products. Test wet tensile strength and wet tensile retention with vertical Finch Cup and horizontal soaking configurations for tissue laboratories.

ISO 12625-5 Tissue paper and tissue products Part 5 sets out standard laboratory procedures to measure wet tensile strength and wet tensile strength retention of tissue paper and finished tissue products on constant-rate-of-elongation (CRE) tensile testers. The standard describes two common instrument layouts: vertical setup with Finch Cup fitted in the lower grip and horizontal setup with a soaking assembly between the clamps. UnitedTest supplies dedicated tissue wet tensile test systems for tissue manufacturers, packaging labs and third-party testing institutes.

Test Principle

A conditioned tissue test specimen of defined geometry is soaked in water under controlled conditions for a fixed dwell time (15 s). The wetted specimen is stretched to rupture at a constant elongation speed. The tensile force‑versus‑elongation curve is recorded. From peak breaking force, wet tensile strength (N/m) is calculated. By parallel dry‑tensile testing on matched specimens, wet‑tensile‑strength retention (%) can be derived as the ratio of wet‑to‑dry tensile performance. Two physical configurations are permitted: vertical test (Finch‑Cup wetting assembly) and horizontal test (inter‑clamp soaking bath).

Definitions:

Wet tensile strength: maximum tensile force per unit width a water‑soaked specimen withstands before fracture, unit N/m.
Wet‑tensile‑strength retention: percentage ratio of wet tensile strength against dry‑conditioned tensile strength from identical sample stock.

Test equipment required for ISO 12625-5 Wet Tensile Strength Test for Tissue Paper

Tensile Testing Machine	Recommend UnitedTest tensile testing machine with a constant Elongation Rate. Two alternative full instrument setups are allowed, both complying with ISO 1924 and ISO 7500‑1 calibration requirements
Vertical tensile‑strength‑testing apparatus	Constant‑elongation tensile tester: test speed (50 ± 2) mm/min; force‑measurement accuracy: ±1 % of reading OR ±0.025 N (whichever is larger); calibrated following ISO 7500‑1. Tester clamps: upper clamp ≥50 mm width, smooth rounded burr‑free faces, adjustable clamping pressure; lower clamp secures the Finch‑Cup assembly. Clamp lines must be parallel and perpendicular to pull direction. Standard total span = (100 ± 1) mm; test span = (50 ± 1) mm. Finch‑Cup soaking device: horizontal cylindrical rod (diameter 5.0 ± 0.1 mm, length ~60 mm), vertically‑movable water bath container, rigid metal mounting tongue for lower‑clamp fixation. In locked raised position, rod immersion depth = (20 ± 1) mm in distilled/deionized water. Precision cutting device: produces straight‑edged specimens of (50.0 ± 0.5) mm width, minimum length 150 mm, parallel undamaged edges
Horizontal tensile‑strength‑testing apparatus	Tensile tester identical speed and force‑accuracy specification as vertical system. Pair of adjustable clamps; clamp‑line parallelism tolerance ≤ 1° relative to pull axis. Standard test span = (100 ± 1) mm; short‑product exception permits reduced secure clamping span (must be reported in test report). Inter‑clamp soaking bath device, may include automatic water‑level regulation; removable table for dry‑tensile measurement mode.
Auxiliary	standard conditioning environment chamber complying with ISO 187; stopwatch; distilled / de‑ionized water at test temperature (23 ± 1) °C; optional laboratory oven for accelerated‑ageing curing treatments.

Test Specimen Information:

Dimensions:

Vertical: (50.0 ± 0.5) mm × ≥150 mm; for very short products, cut the longest possible and reduce the rod-top to upper-clamp-bottom distance from (43.5 ± 1.0) mm to (23.5 ± 1.0) mm.
Horizontal: (50.0 ± 0.5) mm × preferably ≈150 mm, avoiding perforations; if shorter pieces are unavoidable, use the maximum span that still allows secure clamping and report the span.

Number of test pieces: at least 10 specimens per sample; from each, one in machine direction (MD) and one in cross direction (CD) → ≥ 20 test pieces per sample.

Key Test Parameters & Stipulations

Rate of elongation	(50 ± 2) mm/min
Test span — vertical	total (100 ± 1) mm, test span (50 ± 1) mm; rod-top to clamp-bottom (43.5 ± 1.0) mm (short specimens: 23.5 ± 1.0 mm)
Test span — horizontal	(100 ± 1) mm (or 50 ± 1 mm for small products)
Specimen size	(50.0 ± 0.5) mm wide × ≥150 mm long
Soaking time	15 s (both methods)
Soaking water	distilled or deionized, (23 ± 1) °C
Finch immersion depth	looped end ≥20 mm below the initial water level (rod immersion 20 ± 1 mm)
Finch rod	Ø (5.0 ± 0.1) mm, ≈60 mm
Force accuracy	±1 % of reading or ±0.025 N, whichever greater
Curing options	(80 ± 2) °C / 30 min (+ ≥1 h reconditioning) or (105 ± 2) °C / 15 min
Valid results	10 per direction (MD and CD)
Reporting precision	wet tensile strength 3 significant figures; retention 2 significant figures

Test Procedure of ISO 12625-5 Wet Tensile Strength Test for Tissue Paper

Vertical method

Mount the Finch Cup by its tongue in the lower clamp, rod horizontal; pre-set rod-top to upper-clamp-bottom distance at (43.5 ± 1.0) mm (→ total span of the looped dry piece = 100 ± 1 mm; half of it is the test span). Short specimens: 23.5 ± 1.0 mm.
Measurement: put the container in the bottom position and fill to the mark with distilled/deionized water at (23 ± 1) °C; thoroughly dry the rod and all contacting parts. Insert the dry test piece horizontally under the rod, bend it around the rod to form a loop, clamp both ends in the upper clamp, align parallel to the pull direction. Raise and lock the container so the looped end is immersed ≥20 mm; start a stopwatch immediately. After 15 s, lower the container and immediately start the tensile test at (50 ± 2) mm/min.
Validity: discard readings where the piece breaks on the rod or within 2 mm of the clamping line, until 10 valid results per direction are obtained. If >20 % of the pieces from a specimen break at the rod or within 2 mm of the clamp, reject all readings for that specimen, inspect the apparatus and take remedial action.
Housekeeping: wipe the rod dry after each test; top up water after each test; clean and refill after each sample set.
Retention option: remove the water, dry the rod and contact parts, and measure the dry tensile strength of conditioned pieces the same way, without water.

Horizontal method

Remove the table, insert the soaking device, fill with distilled/deionized water at (23 ± 1) °C.
Manual soaking: place the test piece between the clamps, push the ends toward each other so the middle dips into the water, soak 15 s, gently pull the ends apart to lift it from the bath, reposition and clamp, then start the test; record force F in newtons.
Automatic soaking: set soaking time to 15 s, insert, clamp, follow the manufacturer's instructions.
Validity: discard breaks within 5 mm of the clamping line; collect 10 valid results per direction; replenish water after each test; clean/refill after each set (not necessary if the device volume is small enough that water is effectively renewed during the series).
Retention option: remove the soaking device, refit and dry the table and clamps, and measure the dry tensile strength in the same manner.

Industry Fields / Applications

This standard applies to tissue‑paper manufacturing and converting industry, covering base tissue stock, toilet paper, facial tissue, paper towels, kitchen roll and other absorbent tissue‑based consumer or industrial tissue products. It is used for incoming raw‑material quality control, factory production‑line release testing, wet‑strength‑agent formulation development, product‑performance characterisation, and compliance‑related laboratory evaluation.

It does not apply for impurity‑ or defect‑count testing of tissue material.

ISO 12625-5 Wet Tensile Strength Test for Tissue Paper

Related standard:

ISO 1924-2	Paper and board - Determination of tensile properties - Part 2: Constant rate of elongation method (20 mm/min)
TCVN 1862-2	Paper and board. Determination of tensile properties.Part2:Constant rate of elongation method(20mm/min)
BS 4415-1	Determination of the tensile properties of paper and board.-Constant rate of loading method
ISO 1924-3	Paper and board - Determination of tensile properties - Part 3: Constant rate of elongation method (100 mm/min)
GB/T 22898	Paper and board. Determination of tensile properties. Constant rate of elongation method(100 mm/min)
ISO 12625-4	Tissue paper and tissue products — Part 4: Determination of tensile strength, stretch at maximum force and tensile energy absorption
ASTM D828	Standard Test Method for Tensile Properties of Paper and Paperboard Using Constant-Rate-of-Elongation Apparatus
ASTM D829	Wet tensile test for paper and board (saturated with water) – companion to D828 for moisture‑exposed applications.
ISO 3781	"Paper and board — Determination of tensile strength after immersion in water"
ISO 12625-5	"Tissue paper and tissue products — Part 5: Determination of wet tensile strength"
GB/T 465.2	Paper and board - Determination of tensile strength after immersion in water
ANSI/TAPPI T494	Tensile properties of paper and paperboard (using constant rate of elongation apparatus)
AS/NZS 1301.448	Methods of test for pulp and paper - Tensile strength of paper and paperboard (constant rate of elongation method)

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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.

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 the ISO 12625-5 test?

A. It is the international test method for determining the wet tensile strength of tissue paper and tissue products after soaking with water, using a tensile tester running at a constant rate of elongation (CRE). The 2024 edition also defines wet-tensile-strength retention — the wet strength expressed as a percentage of the dry, conditioned strength (ISO 187).

Q2. Why is wet tensile strength so important for tissue?

A. Dry paper is held together mainly by hydrogen bonds between cellulose fibres — and water destroys those bonds. Without wet-strength resin, a tissue keeps only a few percent of its dry strength once wet, i.e. it falls apart exactly at the moment of use (wiping a wet surface, blowing your nose, cleaning up a spill). Wet tensile strength therefore measures whether the product survives its actual job.

Q3. Who needs this test?

A. Tissue mills (production control and resin dosing), converters (toilet paper, facial tissue, kitchen towel, hand towel, napkins, wipe substrates), brand owners writing specifications, third-party QC labs, and importers/exporters needing EN-compliant data.

Q4. Why must the result be reported separately for machine direction (MD) and cross direction (CD)?

A. Tissue is highly anisotropic — fibres are oriented in MD, so MD and CD strengths differ substantially. The standard requires ≥10 specimens per sample, one test piece in MD and one in CD from each, i.e. ≥20 test pieces per sample, calculated and reported separately.

Q5. Vertical (Finch Cup) or horizontal — which should I use?

A. Both are permitted by the standard and both are commercially available. The vertical/Finch Cup route is the classic method (the strip is looped around a Ø5 mm rod, so the machine's force reading is halved in the calculation because two legs carry the load). Horizontal testers are easier to automate and are common in high-throughput labs. Important: Annex A reports precision separately for the two instrument types because results are not automatically equivalent — so the test report must state which type was used.

Q6. Can I convert a wet result measured on a horizontal machine to a vertical-machine value?

A. Not reliably. The 2002 interlaboratory trial (11 labs, 5 products) had to be reported separately for horizontal (6 labs) and vertical (5 labs) instruments. Always quote the instrument type alongside the value.

Q7. What is accelerated (rapid) ageing — do I have to do it?

A. Wet-strength resins keep developing for days to weeks. Accelerated ageing (curing) with heat reproduces that final level quickly: (80 ± 2) °C for 30 min, then re-condition ≥1 h; for fast production checks (105 ± 2) °C for 15 min may be used. It is the user's decision. Rule of thumb in the standard: mill/production samples are generally rapid-aged; goods already in the marketing chain or on sale to consumers are generally not. Whether (and how) the piece was aged must be stated in the report — cured values can differ from what the end user experiences.

Q8. How many test pieces, what size?

A. (50.0 ± 0.5) mm wide × ≥150 mm long, at least 10 specimens per sample × 2 directions = ≥20 test pieces. Pieces must be free of perforations and faults not inherent to the tissue. For very short products, cut the longest piece possible, shorten the span/rod distance, and report the span used.

Q9. How is ISO 12625-5 different from ISO 3781 and TAPPI T 456?

A. Those cover paper and board after immersion in water (ISO 3781 soaks for about an hour). ISO 3781 explicitly excludes tissue and other lightweight, highly absorbent papers and points to ISO 12625-5 instead; TAPPI T 456 (with the Finch device or total immersion) is aimed at heavier papers/boards. ISO 12625-5 is the method tailored to low-basis-weight, fragile tissue.

Q10. Is there a national equivalent?

A. Yes — EN ISO 12625-5:2024 (identical text; CEN members had to implement it by December 2024). In China, GB/T 24328.4—2020 is a MOD adoption of ISO 12625-5:2014 and uses the same core parameters (50 ± 2 mm/min, 50.0 ± 0.5 mm strip, 15 s soak, Finch rod Ø5.0 ± 0.1 mm, S = F/wᵢ × 10³).

Q11. What should I look for when buying an ISO 12625-5 tester?

A. (1) Compliance with ISO 1924-2 / ISO 7500-1 with force accuracy ±1 % or ±0.025 N; (2) correct 50 mm/min rate and span settings (100/50 mm, and 43.5 mm rod-to-clamp distance for vertical); (3) a Finch Cup and/or horizontal soaking device matching the standard's dimensions; (4) a 50.0 ± 0.5 mm cutter giving clean parallel edges; (5) software that reports MD/CD separately, discards invalid breaks, and prints a Clause 10-compliant report; (6) optional automatic soaking (15 s) and constant water level; (7) a curing oven (80 °C or 105 °C) if you run mill samples; (8) calibration certificate and local service.

Q12. Why choose ISO 12625‑5 Wet Tensile Strength Testing Machine for Tissue Paper and Tissue Products from UnitedTest?

UnitedTest manufactures ISO 12625‑5:2024 wet tensile tester for tissue paper & tissue products. Vertical Finch‑Cup and horizontal soaking‑bath configurations for wet tensile strength & wet‑strength‑retention test. Compliant laboratory tissue testing equipment for tissue mills & QC labs worldwide.

UnitedTest designs and manufactures fully‑compliant ISO 12625‑5 wet tensile tester, supporting both vertical Finch‑Cup test setup and horizontal soaking‑bath test method for tissue paper, toilet tissue, kitchen roll, facial tissue and converted tissue products. Our tissue wet strength testing equipment helps paper mills, converting factories, third‑party testing laboratories and R&D labs measure wet tensile strength (N/m) and wet‑tensile‑strength retention (%) according to ISO 12625‑5:2024 latest edition, superseding old ISO 12625‑5:2016.

Our ISO 12625‑5 tensile test machine runs at standard test speed 50 ± 2 mm/min, meets strict force‑measurement accuracy requirements referenced to ISO 7500‑1 and ISO 1924‑2. Optional accessories include standard Finch‑Cup soaking device, horizontal soaking bath assembly, precision specimen cutting tool, and temperature‑controlled soaking water module.

Whether you need production quality‑control batch testing, wet‑strength‑agent formula research, accelerated‑ageing curing test evaluation, or third‑party laboratory certification‑grade measurement, UnitedTest’s ISO 12625‑5 tissue wet tensile testing machine delivers repeatable, inter‑laboratory‑comparable test data for both machine direction (MD) and cross‑direction (CD) tissue samples.

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