ISO 11501 Heat dimensional change of plastic films sheeting, Film thermal shrinkage test

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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.

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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.

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ISO 11501 Thermal Dimensional Change Tester for Plastic Film & Sheeting | UnitedTest

ISO 11501 Plastics — Film and sheeting — Determination of dimensional change on heating is a globally recognized uniform testing standard for plastic thermal shrinkage and expansion analysis. As a professional manufacturer, UnitedTest designs and supplies full ISO 11501 compliant heating dimensional change testing machines for polymer and flexible packaging labs worldwide.

This international standard defines standardized laboratory procedures to accurately measure thermal dimensional variation of plastic films and thin sheets with a maximum thickness of 1 mm. It requires dimensional testing in two critical orientations: machine (longitudinal) direction and transverse direction. The test scope applies universally to all plastic materials, including heat-shrinkable films and non-shrink plastic sheet grades without restriction.

UnitedTest’s ISO 11501 thermal dimensional stability tester fully adheres to all specimen, temperature control and dual-direction measurement rules outlined in the standard. It generates reliable longitudinal and transverse heat deformation data to support production quality control, new material research and export compliance verification for plastic film, sheet and packaging manufacturers.

ISO 11501 Heat dimensional change of plastic films sheeting

Test Principle

The core logic relies on measuring linear dimension shifts caused by released internal residual stress after controlled thermal exposure, with three sequential steps:

Mark and measure original gauge lengths (longitudinal L₀, transverse T₀) on flat specimens before heating.

Lay specimens flat on a kaolin bed inside a temperature-controlled circulating air oven and hold at specified temperature for defined duration.

Cool and recondition specimens, re-measure post-heating gauge lengths (L, T), then calculate percentage dimensional change.

Negative results = shrinkage; positive results = thermal elongation.

Test Specimen Requirements

Dimension: nominal size 120 mm × 120 mm.

Specimen quantity: Prepare 3 identical square specimens.

Sampling position: One specimen cut from the sheet centre, two from lateral sides; side samples must be taken ≥50 mm away from the film/sheet edge to avoid edge effect distortion.

ISO 11501 Heat dimensional change of plastic films sheeting required Test Equipment

Recomend UnitedTest Hot blast Oven with filme size change measuring tools:

Circulating-air oven	Total volume of test assemblies (kaolin bed + specimens) ≤10% of oven free space. Minimum 6 full air circulations per hour for uniform temperature. Temperature tolerance: ±2 °C for temperatures ≥100 °C; ±1 °C for temperatures below 100 °C. Shelves must separate test assemblies by ≥50 mm from each other and oven inner walls.
Metal holding container	Filled with ~20 mm deep kaolin bed; sized to lay specimens flat without bending or deformation.
Immersible temperature probe	Tip inserted into kaolin bed to monitor actual heating medium temperature.
Tools	Resolution of 0.5 mm for length readings ruler and Stopwatch.

Test Parameters:

Heating Time Options

5 min: Non-shrink films not subjected to high-temperature conversion processes

30 min: Thermoshrinkable / thermoformable films and sheets

Recommended Test Temperatures (°C)

Material	Non-shrink grade	Thermoshrink/thermoform grade
Unplasticized PVC	85	125
Plasticized PVC	70	125
Chlorinated PVC (CPVC)	100	150
ABS	—	125
HDPE	125	150
PP	125	175
Cellulose acetate	125	150
PMMA	160	160
LDPE	100	150

Complete Test Procedures of ISO 11501 Heat dimensional change of plastic films sheeting

Preheat the kaolin-filled metal container in the oven to stabilise the kaolin bed at target test temperature.

Mark longitudinal (L₀) and transverse (T₀) 100 mm gauge lengths on each specimen, record initial readings to 0.5 mm precision.

Dust specimen surfaces lightly with kaolin powder, lay flat without tension on the preheated kaolin bed.

Maintain constant target temperature for the material-specific heating duration (5 min for non-high-temperature processing films; 30 min for thermoshrink/thermoformable materials). According recommended temperature benchmarks for PVC, PE, PP, ABS, PMMA and other common plastics.

After heating completes, remove specimens and recondition for at least 30 minutes under the same ISO 291 standard atmosphere used for pre-conditioning.

Re-measure cooled longitudinal (L) and transverse (T) gauge lengths and record data.

Industrial Application Fields

This test is widely applied across polymer manufacturing and downstream processing sectors:

Flexible packaging industry: Heat-shrink wrap, food packaging films, printed laminates, sealable films; critical to avoid curling, misprinting or package deformation during heat sealing, shrink wrapping or retort processing.

Thermoforming industry: Thin plastic sheets for disposable containers, blister packs; evaluates form stability during heating moulding.

Building & construction: PVC decorative films, protective wrapping sheets, insulation thin films; prevents dimensional distortion under ambient high-temperature exposure.

Electrical insulation: Thin polymer insulation films for wiring and electronic components, to guarantee stable dimensions under operational heat loads.

General plastic converting: Calendered/extruded thin sheets, decorative surface films; used for incoming raw material QC and production batch consistency monitoring.

Related Standard:

ASTM D2732	Standard Test Method for Unrestrained Linear Thermal Shrinkage of Plastic Film and Sheeting.
ASTM D1042	Standard Test Method for Linear Dimensional Changes of Plastics Caused by Exposure to Heat and Moisture
ISO 11501	Plastics Film and sheeting Determination of dimensional change on heating. ASTM D2732 enforces fully unrestrained free shrink; ISO 11501 allows optional restrained test modes. Test data from the two standards lack direct comparability, as clearly noted in the D2732 standard text.
GB/T 12027	Plastics--Film and sheeting--Determination of dimensional change on heating
GB/T 13519	Polyethylene heat-shrinkable film for packaging applications
ES 4395	Plastics-Film and sheeting - determination of dimensional change on heating.
ISO 14616	Plastics - Heat shrinkable films of polyethylene, ethylene copolymers and their mixtures - Determination of shrinkage stress and contraction stress
GB/T 34848	Determination of shrinkage character for heat-shrinkable films.
DIN 53369	Testing of plastic films; determination of the shrinking stress.
DIN 53377	Testing Plastic Films to Determine Dimensional Stability

Keywords of ISO 11501: UnitedTest ISO 11501 tester, ISO 11501 plastic film dimensional change on heating machine, MD TD thermal shrinkage tester, plastic sheet heat dimensional stability equipment, thermal dimensional variation test for thin plastic film, 1mm max thickness plastic sheet heating shrink test, machine direction transverse dimensional deformation measurement, heat-shrinkable non-shrink plastic thermal test instrument

Suitable to measure various kinds of plastic pipe or plastic materials size change after heating, or used to heat the test sample. It can be used as a heating oven as well.

Professional film heat shrink tester is precision lab equipment engineered to evaluate thermal shrinkage characteristics and thermal dimensional stability of diverse raw materials, including plastic films. compliant with international testing standards ASTM D2732 and ISO 11501.

Integrated Film Thermal Shrinkage Performance Tester, simultaneously captures real-time test data including temperature, thermal shrinkage force, residual shrinkage force and shrinkage displacement, Conform with ISO 14616, DIN 53369, ASTM D2732 as a shrink force tester or comprehensive shrink tester

Q1: What is the core purpose of ISO 11501?

A1: This international standard defines a unified laboratory method to measure percentage longitudinal (machine direction) and transverse dimensional change of plastic films and sheets (max thickness 1 mm) after controlled heating. It detects both thermal shrinkage (negative value) and thermal elongation (positive value) for all plastic materials, whether heat-shrinkable or non-shrink grades.

Q2: What material scope does ISO 11501 cover? Are there thickness limits?

A2: It applies to all plastic film and flat sheeting up to 1 mm thick, including thermoshrinkable films, thermoformable sheets and regular non-shrink plastic films. It covers common polymers: PP, PE, PVC, ABS, PMMA, cellulose acetate, CPVC, etc. Rigid plastic boards thicker than 1 mm are outside this standard’s scope.

Q3: Why is ISO 11501 thermal dimensional change testing critical for plastic films?

A3: Films retain residual internal stress from extrusion, stretching, calendering and rolling manufacturing. Heating releases this stress and triggers shrinkage or stretching; the test quantifies residual stress levels to optimize production processes.

It simulates real downstream heat exposure: heat sealing, shrink wrapping, thermoforming, high-temperature storage, printing lamination. Uncontrolled dimensional change causes wrinkling, misaligned graphics, warped packaging, loose shrink wraps and product rejects.

It provides standardized numerical data for raw material QC, batch consistency verification, new material R&D formulation comparison, and cross-border supply contract acceptance criteria.

It clearly differentiates heat-shrink specialty films from general stable non-shrink sheets for correct end-use material selection.

Q4: What are the specimen size, quantity and sampling rules?

A4: Quantity: 3 replicate specimens per test batch.

Specimen dimension: 120 mm × 120 mm square.

Sampling positions: One from the sheet centre, two from side areas; side samples must be cut at least 50 mm away from the film edge to avoid edge stress distortion.

Central gauge length marked for measurement: 100 mm for both longitudinal and transverse directions.

Q5: Why use a kaolin bed instead of direct air heating for specimens?

A5: Kaolin powder provides uniform, stable contact heat across the entire specimen surface, prevents uneven hot spots, avoids curling or warping of thin films during heating, and holds specimens flat without tension during thermal exposure, which ensures accurate dimensional change measurement.

Q6: Why do I need to test both longitudinal and transverse directions separately?

A6: Plastic films are manufactured via directional extrusion and stretching, creating anisotropic internal stress. Dimensional shrinkage/expansion values differ greatly between machine (longitudinal) and cross (transverse) directions. Testing both axes simulates real-world directional deformation during printing, forming and wrapping, and provides complete stability data for production design.

Q7: What causes abnormal test results (excessive shrinkage or inconsistent replicates)?

A7: Common root causes:

Specimens cut too close to film edges with edge stress distortion.

Uneven oven temperature failing to meet ISO tolerance requirements.

Specimens laid with tension or folded on the kaolin bed during heating.

Insufficient cooling/reconditioning time before post-heating measurement.

Incorrect test temperature or heating duration mismatched to the polymer material.

Uncalibrated measuring scale with resolution worse than 0.5 mm.

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