ISO 3380 Leather Shrinkage Temperature Test | UnitedTest ISO 3380 Leather Shrinkage Temperature Tester

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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.

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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.

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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.

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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.

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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.

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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.

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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.

ISO 3380 Leather Shrinkage Temperature Tester | UnitedTest

ISO 3380 (IULTCS IUP 16) determines leather shrinkage temperature up to 100 °C by heating specimens in water. UnitedTest supplies ISO 3380 compliant testing machines aligned with CEN/TC 289 for leather thermal‑property quality control.

ISO 3380 specifies a trusted laboratory procedure for measuring the shrinkage temperature (Ts) of leather, identifying the temperature point where a leather sample undergoes sudden contraction upon heating in aqueous conditions. This test corresponds to official IULTCS test method IUP 16 and aligns with European leather standardization under CEN/TC 289. Shrinkage temperature is a key indicator of tanning quality, hydrothermal stability and material durability for all grades of processed leather.

UnitedTest designs and manufactures high‑accuracy ISO 3380 compliant testing equipment for tanneries, footwear manufacturers, automotive leather suppliers and independent material‑testing laboratories.

Test Principle:

A rectangular leather test piece is held vertically under a small constant tension in distilled/de-ionized water. The water is heated at a controlled rate (2 °C/min). When the collagen structure of the leather denatures, the specimen undergoes a sudden contraction. The temperature at which this contraction corresponds to 0.3 % shrinkage from the specimen’s maximum length is recorded as the shrinkage temperature.

ISO 3380 Leather Shrinkage Temperature Test

Specific Test Methods

Dry samples: must be re-wetted by vacuum impregnation in a glass tube with distilled water (desiccator, <4 kPa for 1–2 min, then soak 1–6 h).

Wet samples: skip re-wetting, go straight to mounting.

Shrinkage is detected mechanically via a pointer/magnification system (≥5× amplification) linked to the moving clamp.

Heating continues until abrupt shrinkage occurs, water boils, or target temperature is reached.

Ts = temperature where pointer movement = 0.3 % length reduction from max length.

Test Specimen Information

1. Sampling shall follow ISO 2418 for sampling location rules. Measure specimen thickness per ISO 2589 before cutting test pieces.

2. Specimen dimensions:

- If leather thickness ≤ 3 mm: rectangular strips 50 mm ± 2 mm × 3.0 mm ± 0.2 mm.

- If leather thickness > 3 mm: rectangular strips 50 mm ± 2 mm × 2.0 mm ± 0.2 mm.

3. Specimen quantity: two test pieces parallel to the backbone, two perpendicular to the backbone. For larger batches, one per direction per hide/skin is allowed, provided total is ≥ 4 pieces for each direction.

Test Equipment of ISO 3380 Leather Shrinkage Temperature Test:

Leather Shrinkage‑temperature test apparatus

- Vessel: minimum volume 500 mL, minimum working depth 110 mm; can be pressurized for temperatures >100 °C.

- Fixed specimen holder (pin/clip), positioned 30 mm ± 5 mm above vessel base.

- Movable specimen holder (hook/clip), connected via thread‑pulley system to a mass 3 g heavier than the movable holder, applying constant small tension to test piece.

- Pointer‑pulley mechanism: magnifies specimen movement by factor ≥ 5 for visual observation of shrinkage displacement.

- Temperature measuring device: scale resolution 1 °C, accuracy ± 0.5 °C; sensor placed close to specimen centre.

- Heater: capable of heating water at **2 °C/min ± 0.2 °C/min**.

- Stirrer: ensures water temperature difference across specimen height ≤ 1 °C.

ISO 3380 Leather Shrinkage Temperature Test

Tools

1. Thickness gauge compliant with ISO 2589.

2. Desiccator plus vacuum pump: vacuum below 4 kPa absolute pressure within 2 minutes.

3. Glass test tube: inner diameter 10 mm ± 2 mm, height ≥ 100 mm.

4. Grade‑3 distilled / de‑ionized water meeting ISO 3696 requirements.

Key Test Parameters and stipulations:

Heating rate	2 °C/min ± 0.2 °C/min
Initial water temperature	20 °C ± 2 °C; or at least 10 °C below expected shrinkage temperature (5 min thermal equilibration required)
Vacuum soaking (dry samples)	Absolute pressure < 4 kPa, hold 1–2 min; immersion time 1 h minimum, maximum 6 h
Shrinkage trigger point for Ts reading	0.3 % length shrinkage from maximum specimen length
Valid result rule	Measured shrinkage temperature must be ≥ 5 °C higher than initial bath temperature; otherwise discard result and repeat with colder starting water
Temperature reading interval	Every 30 seconds during heating
Water quality	ISO 3696 Grade 3 distilled / de‑ionized waterISO

Dry specimens MUST be vacuum-rewetted; wet specimens exempt.

Tension must come from specified 3 g-over-mass system.

Pointer movement must be amplified ≥5×.

Top/bottom water temp difference ≤1 °C.

Test Procedures of ISO 3380 Leather Shrinkage Temperature Test:

For dry specimens: complete pre‑soaking steps 1‑3; for pre‑wetted test samples, skip 1‑3.

1. Load 5.5 mL ± 0.5 mL water into glass tube, fully immerse test piece.

2. Place tube inside desiccator, evacuate to < 4 kPa absolute pressure and hold for 1‑2 min.

3. Release vacuum, keep specimen immersed for 1 h‑6 h.

4. Mount specimen: one end on fixed holder, other end on movable holder; adjust pulley‑mass system to apply constant tension.

5. Fill vessel with water, ensure water level is at least 30 mm over specimen top edge.

6. Heat water while strictly maintaining 2 °C/min ± 0.2 °C/min heating rate.

7. Record temperature and pointer position every 30 seconds until heavy shrinkage, boiling or target temperature is achieved.

8. Plot pointer displacement versus temperature; extract temperature at 0.3 % shrinkage as shrinkage temperature.

9. Validate result: Ts shall be at least 5 °C above initial water temperature. If not, reject and rerun test with lower starting temperature.

10. Prepare test report: report mean shrinkage temperature for parallel‑to‑backbone and perpendicular‑to‑backbone directions; note sample identification, deviations from sampling and test protocol

Industry / Application Fields

ISO 3380 applies to all categories of leather.

It is widely used in leather tanneries, footwear manufacturing, leather goods, upholstery leather, automotive leather, leather research laboratories, and third‑party quality inspection organizations. It serves as a routine quality control indicator for tanning processes, raw‑material incoming inspection, finished‑product verification, and tanning‑agent performance evaluation.

Leather manufacturing (tanning, retanning, fatliquoring control).

Footwear & upper leather quality control.

Automotive leather, furniture leather, garment leather.

Leather chemicals industry (evaluating tanning agent efficacy, e.g., Cr, Al, vegetable tannins).

Research institutes studying collagen thermal stability.

Applicable to all leather types (raw, tanned, finished).

Related & Similar Standards

ISO 3376	Leather — Determination of tensile strength and elongation
ISO 3380	Leather - Physical and mechanical tests - Determination of shrinkage temperature up to 100 °C
ASTM D6076	Standard Test Method for Shrinkage Temperature of Leather
GB/T 47488	Leather—Physical and mechanical tests—Determination of shrinkage temperature
IULTCS/IUP 16	Identical leather‑test method published by International Union of Leather Technologists and Chemists Societies
ISO 17227	Leather‑ Test for dry‑heat dimensional stability (related thermal‑stability test but non‑aqueous environment).

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UnitedTest supplies high‑precision leather shrinkage temperature tester for leather hydrothermal stability testing. Fully compliant with ISO 3380, ASTM D6076‑18, GB/T 47488 standards. Ideal for tannery QC, leather laboratory test, tanning degree evaluation. Contact us for quotation.

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 ISO 3380?

ISO 3380:2015 (also IULTCS/IUP 16) is the international standard for determining the shrinkage temperature (Ts) of leather up to 100 °C by heating a specimen in water at a controlled rate and recording the temperature at which sudden contraction occurs.

Q2. Why is the shrinkage temperature important for leather?

Ts is a direct measure of collagen crosslink stability and tanning quality. Untanned hide shrinks near 55 °C; chrome-tanned leather often exceeds 100 °C. Low Ts means poor hydrothermal stability—leather may shrink, wrinkle, or harden during shoe lasting, autoclave cleaning, tropical storage, or automotive cabin heat exposure.

Q3. What is the basic principle?

A strip of leather is held under slight tension in distilled/de-ionized water and heated at 2 ± 0.2 °C/min. The temperature at which the specimen shows 0.3 % contraction from its maximum length is reported as the shrinkage temperature.

Q4: What does shrinkage‑temperature value mean for different tanned leathers?

A: ‑ Chrome‑tanned leather: Ts commonly >95 °C‑100 °C;

‑ Vegetable‑tanned leather: Ts normally ranges 72‑85 °C;

‑ Untreated raw hide: Ts around 60‑65 °C.

Higher Ts means better hydrothermal stability. Low Ts indicates incomplete tanning, and leather risks hardening, shrinking or deformation under humid‑heat environment.

Q5. Do I need to condition leather before the test?

No. Unlike many leather physical tests, ISO 3380 requires no climatic conditioning. Dry samples must be vacuum-rewetted; wet samples are tested directly.

Q6: My test data shows poor repeatability, what are the common root causes?

A: 1. Uncontrolled heating rate (too fast or unstable);

2. Insufficient vacuum soaking, air bubbles trapped inside leather matrix;

3. Non‑uniform water temperature (stirrer malfunction);

4. Improper sampling location (leather has property differences across belly‑back area);

5. Specimen clamping too tight / too loose;

6. Temperature sensor not placed close to specimen centre.

Q7. Can ISO 3380 measure above 100 °C?

The standard method covers up to 100 °C; the vessel may be pressurized to go higher, but the prescribed 0.3 % criterion and reporting format target ≤100 °C. For >100 °C (e.g. SATRA TM 17 with glycerol), it is outside ISO 3380 scope.

Q8. Which industries rely on this test?

Tanneries, footwear manufacturers, automotive interior suppliers, furniture leather QC, leather chemical R&D, third-party labs, and certification bodies.

Q9. What does a failed/low Ts tell you?

Under-tanning, weak crosslinking, over-enzyming, acid swelling, or vegetable-tan under-development. It is an early warning before costly line rejects appear.

Q10. Why Choose UnitedTest as Your ISO 3380 Test‑Machine Supplier?

A: UnitedTest ISO 3380 Leather Shrinkage Temperature Tester | IULTCS/IUP 16 Test Equipment

UnitedTest is a professional manufacturer of leather physical‑mechanical testing instruments, offering fully‑compliant **ISO 3380:2015 (IULTCS/IUP 16) leather shrinkage temperature tester** for leather quality control laboratories, tanneries, footwear & leather‑goods manufacturers, automotive‑leather factories and third‑party inspection agencies worldwide.

Shrinkage temperature is the most critical parameter to evaluate collagen hydrothermal stability and tanning efficiency for all kinds of leather. Our ISO 3380 leather shrinkage temperature tester executes the full test workflow according to ISO 3380‑2015 international standard, including specimen holding system, precise 2 °C/min ± 0.2 °C/min heating control, high‑efficiency stirring unit, accurate temperature sensor and displacement magnification mechanism to capture 0.3 % shrinkage trigger point reliably.

Key Features of UnitedTest ISO 3380 Leather Shrinkage Temperature Tester

1. Full compliance with ISO 3380:2015, IULTCS/IUP 16 standard requirements;

2. Precision temperature‑control system: heating rate strictly 2 °C per minute; temperature sensor accuracy ± 0.5 °C;

3. Built‑in efficient stirring module, ensures water‑bath temperature difference ≤ 1 °C around test specimen;

4. Standard specimen holders, pulley‑weight assembly matching 3 g tension requirement; displacement magnification ≥ 5 times for clear shrinkage observation;

5. Supports vacuum‑soaking preparation for dry leather samples;

6. English‑language operation interface; real‑time temperature & displacement data output for test‑report generation;

7. Robust lab‑grade construction; one‑year warranty and lifetime technical support.

What This Leather Shrinkage Temperature Tester Can Do?

‑ Measure shrinkage temperature for chrome‑tanned leather, vegetable‑tanned leather and all other leather types up to 100 °C;

‑ Assess tanning degree, cross‑link quality and hydrothermal stability of collagen fibres;

‑ Support incoming raw‑material inspection, tanning‑process R&D, batch quality audit and finished‑product performance verification;

‑ Generate repeatable test results matching ISO 3380 reporting requirements.

UnitedTest specializes in leather testing‑equipment R&D and manufacturing. Besides leather shrinkage‑temperature testers, we provide a complete portfolio of leather physical‑mechanical testing machines for thickness measurement, fastness test, tensile test, flexing resistance and other leather‑test standards. We deliver instruments with stable performance, comprehensive after‑sales support and custom‑service for global laboratory clients.

If you are looking for reliable ISO 3380 leather shrinkage temperature test apparatus for your lab, contact UnitedTest for datasheet, quotation and technical consultation.

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