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Key: test item, instrument name, total nonvolatile migration, gravimeter, moisture permeameter

Product

Elmendorf Tear Strength Tester

STT-C
Focusing on packaging and material testing technology, we are committed to quality control in industries such as healthcare, pharmaceuticals, food, packaging, textiles, and new materials. Our products are widely used in enterprises, testing institutions, universities, and research institutes.

Category:

Impact Resistance

Pendulum Tear Tester - Elmendorf Method for Films, Papers & Fabrics

Functions

Measure the tear resistance (Elmendorf tear strength) of plastic films, thin sheets, paper, paperboard, and woven/non‑woven fabrics.

Determine the force required to propagate a tear from an initiated cut or notch.

Essential for quality control, incoming inspection, and R&D in packaging, paper manufacturing, and textile industries.

Working Principle

The instrument uses a calibrated pendulum arm with a fixed tearing distance (43 mm). The operator raises the pendulum to a starting angle of 27.5°, storing potential energy. A specimen is clamped between two pneumatic jaws. Upon release, the pendulum swings downward, and its falling blade tears the specimen from a pre‑cut slit. The energy lost by the pendulum during tearing is measured by a high‑resolution photoelectric encoder that records the swing angle. The embedded microprocessor calculates the tear force (in grams‑force or Newtons) and automatically displays the result. Multiple pendulum weights (400 gf to 6400 gf) allow testing across a wide range of material strengths.

Compliant Standards

ISO 6383‑1:1983 - Plastics - Film and sheeting - Determination of tear resistance - Part 1: Trouser tear method

ISO 6383‑2:1983 - Plastics - Film and sheeting - Determination of tear resistance - Part 2: Elmendorf method

ISO 1974:2012 - Paper - Determination of tearing resistance - Elmendorf method

ASTM D1922‑15(2021) - Standard Test Method for Propagation Tear Resistance of Plastic Film and Thin Sheeting by the Elmendorf Tear Method

ASTM D1424‑09(2019) - Standard Test Method for Tearing Strength of Fabrics by the Elmendorf Tear Tester

ASTM D689‑17 - Standard Test Method for Internal Tearing Resistance of Paper

TAPPI T414 - Internal tearing resistance of paper (Elmendorf method)

GB/T 16578.2‑2009 - Plastics - Determination of tear resistance - Part 2: Elmendorf method

GB/T 455‑2002 - Paper and board - Determination of tearing resistance

Key Features

Five Pendulum Capacities: Quick‑change weights provide 400 gf, 800 gf, 1600 gf, 3200 gf, and 6400 gf ranges, covering everything from thin LDPE films to heavy paperboard and industrial fabrics.

High‑Resolution Angle Measurement: Precision photoelectric encoder captures the pendulum rotation with 0.001 N force resolution, ensuring accurate tear energy calculation.

Fully Automatic Operation: Pneumatic specimen clamping, pneumatic pendulum release, and automatic angle measurement eliminate manual handling variability.

System Error Compensation: Built‑in pendulum center‑of‑mass adjustment, leveling, and rotation friction compensation minimize instrumental bias and ensure long‑term accuracy.

Intelligent Weight Prompt: The system automatically judges whether the specimen exceeds the current range and prompts the operator to increase or decrease weight - preventing mis‑testing.

Dual‑Mode Control: Operate via the instrument microcomputer for standalone QC, or connect to a PC for graphical analysis, database storage, and customizable report printing.

Statistical Analysis: Automatic calculation of Max, Min, Average, and Standard Deviation across multiple specimens.

Technical Specifications

Parameter	Specification
Pendulum Capacities	400 gf, 800 gf, 1600 gf, 3200 gf, 6400 gf
Force Resolution	0.001 N
Tearing Arm Length	104 mm
Initial Angle	27.5°
Tearing Distance	43 mm
Clamping Mode	Pneumatic
Pendulum Release	Pneumatic
Gas Pressure	0.6 MPa (user‑supplied)
Gas Connector	Φ4 mm Polyurethane tube
Overall Dimensions	630 × 345 × 570 mm (L×B×H)
Net Weight	60 kg
Power Supply	AC 220/110V, 50/60 Hz

Standard Configuration

Main testing machine (host unit)

Basic pendulum assembly (capacity per order)

Calibration weight set

Professional PC software

Additional pendulum weights: 400 gf, 800 gf, 3200 gf, 6400 gf

Operation manual and calibration certificate

Application Industries & Scenarios

Flexible Packaging & Converting

BOPP / BOPET Films: Measure Elmendorf tear strength for snack food wrappers and lamination base films.

LDPE / LLDPE Bags: Evaluate tear propagation resistance of shopping bags and freezer bags.

Multi‑Layer Laminates: Test tear behavior of PET/PE, OPP/CPP, and aluminum‑foil laminates.

Paper & Printing

Corrugated Liners: Assess tearing resistance of kraft linerboard for box manufacturing.

Magazine & Catalog Paper: Evaluate tear strength for binding and trimming quality.

Label Stock: Test face‑stock tear characteristics for easy dispensing.

Textiles & Non‑Wovens

Woven Fabrics: Determine tear strength of apparel, upholstery, and industrial textiles per ASTM D1424.

Non‑Woven Hygiene Products: Measure tear resistance of diaper back‑sheets and medical gowns.

Geotextiles: Evaluate tear propagation in civil engineering fabrics.

Pharmaceutical & Medical Packaging

Blister Foil: Test tear‑open characteristics of push‑through packaging.

Sterile Pouches: Assess tear initiation and propagation for easy‑open medical packs.

Transdermal Patch Liners: Evaluate controlled‑tear release papers.

Research & Third‑Party Testing

CNAS/CMA‑Compliant Testing: Issue Elmendorf tear test reports referencing ISO 6383 or ASTM D1922.

New Material Development: Compare tear modifiers (e.g., titanium dioxide, calcium carbonate) in polyolefin films.

Failure Analysis: Investigate field complaints of unexpected tearing during filling or conversion.

Frequently Asked Questions (FAQ)

Q1: What is the Elmendorf tear test method?

A: The Elmendorf method measures the force required to propagate a tear from a pre‑cut slit in a specimen. A pendulum with a fixed tearing distance (typically 43 mm) swings down and tears the sample. The energy lost by the pendulum is converted to tear force. It is the most widely used method for films, papers, and fabrics globally.

Q2: Which standard should I use - ISO 6383 or ASTM D1922?

A: Both are equivalent for plastic films. ASTM D1922 is preferred in North America; ISO 6383‑2 is the international standard. Choose based on your customer's location or contractual requirement. The instrument supports both simultaneously.

Q3: How do I select the correct pendulum capacity?

A: The specimen should tear within 20 % to 80 % of the selected pendulum's full scale. For thin LDPE films (~25 µm), start with 400 gf or 800 gf. For thicker laminates or paperboard, use 1600 gf to 6400 gf. The instrument's intelligent prompt will alert you if the range is incorrect.

Q4: Can this instrument test both films and paper?

A: Yes. With the appropriate pendulum weight and specimen dimensions, the same instrument performs tear tests on plastic films (ISO 6383 / ASTM D1922), paper (ISO 1974 / ASTM D689 / TAPPI T414), and fabrics (ASTM D1424).

Q5: What is the purpose of the pneumatic clamp?

A: Pneumatic clamping ensures uniform, repeatable gripping pressure without operator fatigue or variability. This is critical because inconsistent clamping can artificially raise or lower tear values.

Q6: How is the tear force calculated?

A: The photoelectric encoder measures the pendulum's swing angle before and after tearing. The difference in potential energy (calculated from the angle change and pendulum mass) equals the energy absorbed during tearing. The instrument's microprocessor converts this to tear force in grams‑force (gf) or Newtons (N).

Q7: What gas supply is required?

A: The pneumatic clamp and release require a clean, dry compressed air source at 0.6 MPa. Connection is made via a Φ4 mm polyurethane tube. An in‑line filter‑regulator is recommended.

Function:
Used to test the tear resistance of films, sheets and fabrics.
Principle:
Lift the pendulum to a certain height to make it have a certain potential energy; when the pendulum swings freely, it uses its own stored energy to tear the sample; the computer control system calculates the energy consumed when tearing the sample, so as to obtain the force required for tearing the sample.
Standards:
ISO 6383-1, ISO 6383-2, ISO 1974, GB/T16578.2, GB/T 455, ASTM D1922, ASTM D1424, ASTM D689, TAPPI T414.
Characteristics:
- High resolution photoelectric encoder, precise measurement of swing arm rotation angle.
- Pneumatic sample clamping, automatic release of swing arm, automatic angle measurement and automatic calculation of tear resistance.
- Pendulum center of mass adjustment, horizontal adjustment, rotation friction compensation, reduce system error.
- Automatically judge and prompt to increase or decrease weight.
- Equipped with multiple sets of pendulum capacity to meet different test requirements of users.
- Automatic statistics of test data and graphic display of test results.
- Computer software and instrument microcomputer dual control, easy to operate, with database storage and query function.
Specification:
- pendulum capacity： 400gf, 800gf, 1600gf, 3200gf, 6400gf.
- force resolution： 0.001 N.
- Clamping mode： Pneumatic.
- Swing release： Pneumatic.
- Tearing arm： 104 mm.
- Initial angle： 27.5°.
- Tearing distance： 43 mm.
- Gas pressure： 0.6 MPa （Self supply of gas source）.
- Gas connector： Ф4 mm Polyurethane pipe.
- Size： 630Ⅹ345Ⅹ570 (mm).
- Power supply： AC220/110V 50/60Hz.
- Net weight： 60 Kg.
Configuration：
Principle machine, basic swing, calibration weight, professional computer software, other weight（400gf,800gf,3200gf,6400gf）.

Keywords:

Bottle Drop Tester for Plastic Bottles & Containers

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