Leather Vamp flex Tester
The Leather Vamp Flex Tester is designed to evaluate the propensity of footwear upper materials—especially vamps—to crack, crease, or produce salt spue under repeated flexing. The instrument simulates the conditions experienced in the vamp area of shoes during walking. Both wet and dry specimens can be tested at room temperature. The tester is suitable for flexible materials such as leathers, coated fabrics, and textiles used in footwear uppers and linings.
Application
The Leather Vamp Flex Tester is suitable for:
Assessing the flexural resistance and durability of leather, coated fabrics, and textiles used in shoe vamps.
Testing for cracking, creasing, or salt spue in shoe upper materials.
Simulating forces experienced during walking, including stretching, bending, and squeezing.
Quality control and material selection in footwear R&D and manufacturing.
Ensuring durability of shoe uppers for sports shoes, casual shoes, protective footwear, and fashion footwear.
Standards
The tester complies with:
(1) EN ISO 20344-2004, Section 6.5.2 — Footwear: Test Methods
(2) EN ISO 22288 — Flexing Resistance of Leather
(3) ISO 5423, Section 5.2 — Shoe Upper Leather Stretching and Bending Testing
(4) SATRA TM25 — Leather Flexing Test
(5) GB/T 20991, Section 6.5.2 — Leather: Cold and Flexing Resistance
(6) AS/NZS 2210.2, Section 6.5.2 — Footwear Test Methods
Parameters
| Item | Specification |
|---|---|
| Stretching Distance | 19 ± 0.5 mm |
| Scaling Speed | 300 ± 30 CPM |
| Specimen Size | 64 × 64 mm |
| Number of Samples | 12 pcs |
| Fixture | 40° V-shape, 6.4 mm (R) |
| Counter | 6-digit LCD digital display |
| Power Supply | AC 220V, 1Φ, 2A |
| External Dimensions (L×W×H) | 55 × 35 × 30 cm |
| Weight | Approx. 60 kg |
Features
Simulates real walking flexing conditions for shoe vamps.
Tests both wet and dry specimens to assess cracking, creasing, or salt spue formation.
Square specimens are flexed repeatedly over inverted V-shaped clamps.
Oscillating clamps produce a downward crease surrounded by four upward creases for consistent stress.
Automatic counter and preset cycles for reproducible results.
Power-off memory function preserves test progress during interruptions.
Accessories
(1) Standard V-shaped fixture
(2) Specimen clamps for 12 samples
(3) Digital LCD counter
(4) User manual and calibration certificate
(5) Power cable
Test Procedures
(1) Prepare square specimens (64 × 64 mm) and mount them on the V-shaped clamps.
(2) Set the stretching distance, scaling speed, and number of cycles on the control panel.
(3) Start the test; the clamps oscillate to flex the specimens repeatedly.
(4) The machine automatically stops after the preset number of cycles.
(5) Inspect specimens for cracking, creases, or salt spue.
(6) Record results for quality control or material evaluation.
Maintenance Information
Clean the V-shaped clamps and specimen holders regularly to prevent residue buildup.
Inspect moving parts and lubricate if needed for smooth operation.
Verify digital counter functionality and recalibrate periodically.
Keep the tester in a dry environment, away from moisture or corrosive materials.
Check power supply and wiring for safety before each use.
FAQ
1. What is this product?
It is the Leather Vamp Flex Tester, used to evaluate flexing resistance and cracking of shoe vamp materials.
2. What is this product used for?
It simulates walking conditions to determine whether shoe upper materials will crack, crease, or produce salt spue under repeated flexing.
3. Why is this product important?
It ensures durability and quality of shoe upper materials, helping prevent early material failure and improving footwear performance.
4. What industries is this product suitable for?
Footwear manufacturing, leather processing, protective footwear R&D, and laboratory quality control.
5. What types of this product are available?
Standard room-temperature model for wet or dry specimens; suitable for leather, coated fabrics, and textile uppers.
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