Measures shoe upper leather flexing endurance per SATRA TM25 standard.
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The Upper Leather Flexing Tester evaluates the flexing endurance and resistance to cracking of shoe upper materials (vamp leather) by applying repeated zigzag flexing. It simulates the bending and stretching stresses experienced during walking and provides an objective assessment of material durability, wrinkle formation, and crack development.
(1) Men’s and women’s leather uppers: High-quality dress shoes, casual shoes, and sports shoes.
(2) Synthetic leather and PU uppers: Footwear used in casual, sports, and work shoes.
(3) Shoe vamp materials: Leather, PU, and other upper materials before assembly into finished shoes.
(4) Footwear R&D: Assessing new upper materials or surface treatments for resistance to flexing.
(5) Quality control in production: Evaluating consistency and durability of upper materials before assembly.
(6) Laboratory testing: Material research for wear, wrinkle formation, and cracking resistance.
(1) GB/T 20991-2007 — Test Methods for Personal Protective Equipment Shoes
(2) EN ISO 20344-2012 — Personal Protective Equipment — Footwear — Test Methods
(3) SATRA TM25 — Upper Flexing Resistance Test
(4) ISO 4643 — Leather — Determination of Flexing Endurance
(5) ASTM D1052 — Standard Test Method for Flexing Endurance of Leather
(6) BS 5131 — Footwear Testing — Upper Flexing
(1) Measures upper leather or synthetic materials’ resistance to flexing, wrinkles, and cracking.
(2) Simulates real-world stresses experienced by the shoe vamp during walking.
(3) Provides visual assessment criteria to quantify material durability.
(4) Supports multiple testing stations (4 or 12 samples) for higher throughput.
(5) Adjustable flexing speed, stroke, and clamping angle for precise control.
| Item | Specification |
|---|---|
| Expansion Speed | 300 ± 30 r/min |
| Expansion Stroke | 19 ± 1.5 mm |
| Sample Size | 64 ± 1 mm × 64 ± 1 mm |
| Number of Test Pieces | 4 or 12 samples |
| Clamping Angle | 40 ± 1° |
| Volume | 70 × 36 × 37 cm |
| Power Source | AC 220V, 10A |
(1) Clamping jaws for 4 or 12 samples
(2) Sample fixture plates
(3) Wrench set for assembly and adjustments
(4) Power cable
(5) User manual and calibration certificate
(1) Prepare upper material samples of the specified size (64 × 64 mm).
(2) Mount the samples securely in the clamping jaws.
(3) Adjust the clamping angle to 40° ± 1°.
(4) Set expansion speed (300 ± 30 r/min) and stroke (19 ± 1.5 mm).
(5) Start the test machine and allow the samples to undergo repeated zigzag flexing.
(6) Observe and record the occurrence of wrinkles or cracks at intervals according to the standard.
(7) Continue the test until the specified number of cycles is reached or until a defined damage level is observed.
(1) Keep the machine clean and free from dust and moisture.
(2) Lubricate moving parts, pivots, and bearings monthly or after 1000 hours of operation.
(3) Inspect clamping jaws and fixtures for wear or deformation and replace if necessary.
(4) Verify expansion speed and stroke calibration periodically.
(5) Ensure the power supply and control system are functioning correctly.
(6) Store the machine in a dry, stable environment to prevent corrosion and damage.
Qinsun Instruments Co., LTD is a professional laboratory testing instrument manufacturer in China,Have been focusing on laboratory instrument R&D more than 30 years and have rich industry experience,Based on international testing standards,We are also the instrument supplier for BV SGS laboratory,We provide one-stop solutions for lab instruments,Free Training and Turn-Key Service,Products exported all over the world,Offer 36 month warranty and are a trustworthy partner.
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