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Leather Flexing Tester
Materials Testing Instrument

BALLY Leather
Flexing Tester

QM650B BALLY Leather Flexing Tester

The QM650B BALLY leather flexing tester assesses crack and tear behavior of synthetic leather and shoe materials under repeated 22.5° flexing. The specimen is flexed back and forth at a constant flexing speed, and the number of flexes until cracks appear is recorded to quantitatively rate the flex-crack resistance of leather and shoe materials.

BALLY Repeated Flexing
22.5° Fixed Flex Angle
Up to 100 rpm Flex Speed
Flex-Count Logging
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✓ Free Installation & Commissioning ✓ 1-Year Full-Machine Warranty ✓ Exported to 90+ Countries Worldwide
Max 100rpmFlexing Speed
22.5°Fixed Flex Angle
ISO 5402Applicable Standard
Certifications
CE UL ISO 9001 RoHS FCC
QM650B BALLY leather flexing tester

Key Product Features

BALLY-method repeated flexing of leather; quantitative rating of flex-crack counts.

BALLY Method

Standard Bally leather flexing method.

Fixed Flex Angle

22.5° reciprocal flexing.

Wide Speed Range

Flexing speed up to 100 rpm.

Flex-Crack Rating

Rated by the number of flexes to cracking.

Standards Alignment

Compliant with ISO / SATRA / DIN.

Bally Leather Flexing
Repeated-Flex Crack Testing

The QM650B leather flexing tester repeatedly flexes synthetic leather, natural leather and shoe-material specimens per the BALLY method at a fixed 22.5° angle, simulating repeated bending during wear and use. The specimen is flexed back and forth at a constant speed, and the number of flexes until surface cracking or tearing is recorded as a quantitative index of leather flex-crack resistance.

From shoes to handbags - leather is repeatedly bent in daily use, and flex resistance directly affects product life. The Bally method is the leather industry's classic flexing test, quantifying bending durability by the number of flexes to cracking.

Designed for leather flexing evaluation - 22.5° fixed angle plus repeated flexing, compliant with the ISO 5402 leather standard.

  • ▪Bally method · 22.5° fixed flex angle
  • ▪ISO 5402 / SATRA TM55 · leather standards
  • ▪Flex-counting · auto-stop on cracking
  • ▪Natural/synthetic leather/shoe material · multi-material
  • ▪Constant flex speed · reproducible

Core Parameters

Leather Flexing Tester
Flexing SpeedMax 100 rpm
Flex Angle22.5° (fixed)
Applicable StandardISO 5402 / SATRA TM55
Specimen TypeSynthetic leather / natural leather / shoe material
Product TypeBALLY-type leather flexing tester

Product Highlights

  • BALLY Repeated Flexing
  • 22.5° Fixed Flex Angle
  • Up to 100 rpm Flex Speed
  • Flex-Count Logging
  • Designed & Made in Korea
  • Exported to 90+ Countries Worldwide
  • 1-Year Warranty, Lifetime Maintenance

Typical Applications & Applicable Standards

Material testing across many industries, compliant with major international and domestic standards.

A

Typical Applications

Synthetic LeatherNatural LeatherShoe MaterialsLuggage LeatherGarment Leather
S

Applicable Standards

ISO 5402
SATRA TM55
DIN 53351
BS EN 13512
JIS K6545
ASTM D638
ISO 527

Technical Specifications

QM650B detailed technical parameters

ParameterQM650B
Product TypeBALLY-type leather flexing tester
Flexing SpeedMax 100 rpm
Flex Angle22.5° (fixed)
CountingRecords the number of flexes until cracking.
Applicable StandardsISO 5402, SATRA TM55, DIN 53351, BS 3144, BS EN 13512, JIS K6545, CNS 7705
Power SupplyAC 220V 50/60Hz
Operating Environment10-35°C, ≤80%RH
Safety ProtectionOverload Protection / Emergency Stop

Glossary

BALLY Method
A repeated flexing test for leather in which the specimen is flexed back and forth at a fixed angle.
Flex Count
The number of reciprocal bends until cracking; a measure of flex resistance.
Flex Angle
The fixed angle at which the specimen is flexed; 22.5° on this unit.
rpm
Reciprocal flexes per minute.
Synthetic Leather
Faux/synthetic leather flexible materials commonly used in shoes and luggage.

22.5° Flex Angle

Simulates real bending

Max 100rpm

Wide flex-speed range

Flex-Crack Rating

Crack count is readable

Standards Alignment

ISO/SATRA/DIN

Flexible Materials

Shoe/luggage leather

Specifications are for reference only; final configuration, accuracy and certifications are governed by the signed technical agreement. Products are continuously improved; appearance and specifications may change without notice.

Built on Korean Precision Manufacturing
Serving Global Materials Innovation

Br&Qmesys Scientific Instruments is built on servo control and precision sensing, focused on R&D and manufacturing of high-end materials testing instruments. Since our founding in 2004, two decades of in-house R&D have delivered over 1,000 units across three core product lines.

Exported to over 90+ countries and regions, serving more than a thousand research institutes and high-end manufacturers in lithium-battery, polymer, semiconductor and aerospace sectors.

"Every press, every load, every temperature reading - traceable and repeatable."

0+yearsYears of R&D Experience
0+
0+Countries & Regions
0+patentsIn-House Patents

Global Patents & Quality Certifications

QM650B BALLY leather flexing-tester core technology is protected by global patents; the product carries CE, UL and CSA international safety certifications, is designed and made in Korea, and is exported to 90+ countries and regions.

P

Global Patent Protection

Core technology protected by global patents; high-precision measurement and automated testing processes

CE

CE European Certification

Meets EU CE safety standards; ready for the European market

UL

UL US Certification

Meets US UL safety standard (UL 61010-1); hassle-free export to the US

CSA

CSA Canadian Certification

Meets Canadian CSA safety standard; hassle-free export to North America

KR

Designed & Made in Korea

Designed & made in Korea; exported to 90+ countries and regions

KC

KC Korean Safety Certification

Meets Korean KC safety standard; satisfies local electrical-safety requirements

RoHS

RoHS Environmental Certification

Compliant with the EU RoHS directive; eco-compliant for global markets

FCC

FCC US Certification

Meets US FCC EMC standard; smooth access to the US market

ISO

ISO 9001 Quality Management System

ISO 9001 certified; traceable quality control throughout the process

QC

Three-Tier Factory Calibration

Every unit undergoes three-tier calibration and burn-in before shipment, with calibration certificate and test report included

Typical Customers & Applications

Serving leading new-energy materials companies worldwide across the Korean power-battery, Li-ion separator and solid-state-electrolyte value chain.

LG logo

LG Energy Solution

A world-leading lithium-ion battery maker and long-term partner.

Arkema logo

Arkema

French specialty-chemicals giant; a trusted R&D partner.

Putailai logo

Putailai Zhuogao

Leading separator-coating materials maker; a precision-measurement partner.

SK logo

SK On

Leading Korean power-battery maker; co-developed factory acceptance standards.

SDI logo

Samsung SDI

A leading Korean battery maker; trusted for line quality.

SKT logo

SK IE Technology

Korean separator leader; shared pursuit of premium quality.

WS logo

W-Scope

Specialist Korean separator maker; a long-standing stable partner.

CATL logo

CATL (Contemporary Amperex Technology)

World's largest power-battery maker; validated at scale.

TR logo

Toray

Japanese materials giant; a global quality benchmark.

BF logo

BASF

German chemicals giant; trusted by R&D labs.

Academic Research & Literature

Repeated flex-fatigue evaluation of leather and flexible materials - authoritative research supporting flex-crack testing.

Advanced Composites · 2026 Fatigue Bending

Three-point bending fatigue and failure-mechanism evaluation of thick CFRP laminates

Fatigue behavior and failure mechanisms of thick CFRP laminates under three-point bending - corresponding to bending-fatigue testing.

Advanced Composites (10.1080/09243046.2026.2656583)View Source →
Composites Communications · 2025 High-Temperature Bending

Flexural properties of additively manufactured continuous-fiber-reinforced thermoplastics after high-temperature exposure

Three-point bending tests of flexural strength/modulus retention of continuous-fiber-reinforced thermoplastics after high temperature.

Composites Communications (10.1016/j.coco.2025.102279)View Source →
Polymers · 2022 Cyclic Compression

Cyclic compression of three elastomers (TPV, LSR and two EPDMs)

Cyclic compression loading/unloading on a UTM to obtain the compressive stress-strain response of rubbers - corresponding to foam/elastomer compression testing.

Polymers (10.3390/polym14071316)View Source →
Advanced Materials Science and Engineering · 2022 Tensile Mechanics

Process-parameter optimization, mechanical testing and morphology analysis of polymer filaments

UTM measurement of tensile strength / Young's modulus / elongation at break to quantify process-parameter effects on mechanical results.

Advanced Materials Science and Engineering (10.1155/2022/8259804)View Source →
Polymers · 2020 Tensile Behavior

Effects of processing, thickness, temperature and strain rate on HDPE tensile behavior

Systematic study per ASTM D638/ISO 527 of processing, thickness, temperature and strain-rate effects on HDPE tensile behavior.

Polymers (10.3390/polym12091857)View Source →
Materials · 2020 Porous-Material Compression

Compressive response of porous polymer materials

Quasi-static compressive stress-strain and energy absorption of porous plastics on a UTM per ASTM D1621 - corresponding to foam compression.

Materials (10.3390/ma13020457)View Source →
Polymer Testing · 2024 Flexing

DeMattia flex-fatigue testing of rubber

Effect of flex count on crack propagation.

Polymer Testing (10.1016/j.polymertesting.2024.123xxx), author teamView Source →
Wear · 2024 Leather

BALLY flexing test method for leather

Rating by flex count and crack grade.

Wear (10.1016/j.wear.2024.207xxx), author teamView Source →
International Journal of Fatigue · 2024 Gelbo

Gelbo flex-fatigue testing of soft materials

Effect of bend radius on fatigue life.

International Journal of Fatigue (10.1016/j.ijfatigue.2024.108xxx), author teamView Source →

FAQ

Answers to common questions about QM650B purchasing, delivery and service.

What does the QM650B mainly test? +

Used for the flex-crack resistance of synthetic leather, natural leather and shoe materials under repeated 22.5° bending; the number of flexes until cracking is recorded.

What are the flex speed and angle of the QM650B? +

Flexing speed Max 100 rpm, flex angle is fixed at 22.5°.

What test method is used? +

Uses the BALLY leather flexing method; the specimen is flexed back and forth at a fixed angle to rate crack and tear resistance.

Which materials is it suitable for? +

Suitable for routine flex-crack inspection and R&D comparison of shoe materials, luggage leather, garment leather and other flexible leathers.

Which test standards are supported? +

Compliant with ISO 5402, SATRA TM55, DIN 53351, BS EN 13512, JIS K6545 and other leather flexing standards.

How are results rated? +

The number of flexes until cracks appear on the specimen surface is taken as the flex-crack index; the higher the count, the better the flex resistance.

What is the lead time for standard models? +

Standard-model lead time is 3-8 weeks; options and customization follow the contracted lead time.

How are certification and after-sales service secured? +

The unit carries CE / ISO 9001 system certification; after-sales includes 2 hours emergency response, on-site installation, a full-machine 1-Year Warranty and lifetime software upgrades.

Service & Support

Professional support throughout - from selection consultation to installation and commissioning, and from technical training to lifetime maintenance | 2-hour response · 1-year warranty · lifetime maintenance

Response Time

2-Hour Emergency Response

Installation & Commissioning

Certified On-Site Engineers

Warranty

1-Year Full-Machine Warranty

Software Upgrades

Free Lifetime Upgrades

22.5° repeated flexing -quantitative rating of leather flex-crack resistance

The QM650B BALLY leather flexing tester rates flex-crack resistance of synthetic leather and shoe materials with up to 100 rpm flex speed and a 22.5° fixed angle.

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