Elmendorf Tear Strength Tester
Elmendorf pendulum determination of tear resistance for films, paper and textiles, with electronic readout of tear force that avoids mechanical pointer reading errors.
Purpose | What it does for you
Determines the tear resistance (tear force) of plastic films, laminates, paper, paperboard and textiles by the Elmendorf method. Once a pack has been nicked, whether the tear propagates easily depends on tear propagation resistance — making tear strength a key metric for easy-tear notch design, child-resistant packaging and heavy-duty sacks.
Key Features
- Elmendorf pendulum method complying with GB/T 16578 and ASTM D1922
- Electronic readout showing tear force digitally, avoiding pointer reading errors
- Multiple pendulum ranges covering everything from films to paperboard
- Pneumatic or manual clamping for consistent specimen mounting
- Automatic statistics over repeated tests, outputting mean and standard deviation
Operating Principle
Elmendorf method: a specimen with a pre-cut notch is clamped between the pendulum and a fixed jaw. The pendulum is released with a defined potential energy; as it swings it tears the specimen, and the lost potential energy equals the work done in tearing. Tear force (mN) is derived from the work and the tear length. Electronic models capture the swing angle with an encoder and display tear force digitally.
Technical Specifications
| Range | by pendulum range (multiple) |
|---|---|
| Accuracy | ±1% of reading |
| Specimen | standard size, thickness per method |
| Pre-cut Notch | pre-cut notch 20 mm |
| Power Supply | AC 220/110 V ±10%,50/60 Hz |
Note: Due to continuous product iteration and varying application conditions, the technical parameters on this page are typical reference values and are not to be used as acceptance criteria. For tender and customized projects, the product model, configuration and specifications are subject to the mutually confirmed technical agreement and the actual delivered product. For parameter matching tailored to your specific project, please contact us.
Standard Configuration
Main unit, pendulum (selected by range), specimen cutter, manual and factory calibration certificate. Final scope per the configuration list.
Application Scenarios
- Tear resistance of plastic films and laminates (GB/T 16578.2)
- Tear resistance of paper and paperboard (GB/T 455)
- Opening performance verification of easy-tear notches and laser-scored packaging
- Tear resistance of nonwovens, textiles and medical packaging materials
Compliance Standards
Industries Served
- Packaging & Printing
- Plastics & Rubber
- Textile & Leather
- Medical Devices
- Third-Party & Government Testing Institutes
- Material R&D, Universities & Institutes
Frequently Asked Questions
Should I test single plies or several together?
Follow the standard: films are commonly tested as a single ply or as stacked plies with the number reported; paper usually specifies stacked plies. What matters is consistency with your standard or customer specification, and recording the ply count in the report — otherwise data cannot be compared.
Does LabStone support OEM/ODM and customised instruments?
Yes. Standard models ship as-is, while chamber count, specimen size, fixtures, temperature range and software modules (including the GMP Computerized System module) can be tailored to your SOP and URS. IQ/OQ/PQ validation documentation packages are available.
What is the typical lead time, and how is shipping handled?
Standard models usually ship in 4–8 weeks; customised builds depend on the agreed scope. Instruments are packed in export wooden cases and can move by sea, air or rail. We supply proforma invoice, packing list and certificate of origin (CO / Form E), and work under EXW, FOB, CIF or DAP terms.
How are installation, training and calibration handled after delivery?
We provide remote installation guidance, bilingual (Chinese/English) manuals and video training; on-site commissioning by our engineers is available. Users can self-calibrate with standard weights, reference films or calibrated leak standards, and third-party calibration certificates can be supplied.
What is the warranty, and how are spare parts supplied?
The instrument carries a 12-month warranty from acceptance plus lifetime maintenance support. Consumables (molecular sieve, desiccant, sealing grease, printer paper) are kept in long-term stock, and key components are international brands available worldwide. We respond to technical enquiries within 24 hours.
Do the instruments comply with ASTM, ISO and pharmacopoeia standards?
Yes. Every instrument lists its applicable standards on the specification page (ASTM, ISO, GB, YBB, Chinese Pharmacopoeia, USP, EP, JIS, DIN, TAPPI and more). The software outputs raw records and reports suitable for audit trails, with an optional GMP / FDA 21 CFR Part 11 compliance module.
Which languages does the software support, and can it integrate with a LIMS?
The software ships with Chinese and English interfaces; other languages can be added on request. Data export is available over RS232, USB, Ethernet or Wi-Fi, and reports can be exported to Excel, PDF or structured files for LIMS integration.