Cometech QC-551 Long Extensometer | High Elongation Rubber & Plastic | 0.025mm Resolution | 700mm / 1100mm Stroke | Gauge 10–50mm
- Long extensometer for measuring high-elongation materials (>20% elongation) including rubber, plastic, PE, fabric, and webbing — clamps directly onto a dumbbell-shaped specimen and auto-detects deformation in real time when linked to a Cometech testing machine; no need to remove during test.
- Two type options: S (standard) — 700mm test stroke; L (extended) — 1100mm test stroke; resolution: 0.025mm; gauge length: 10–50mm; specimen thickness: 0.2–6mm.
- Signal output: A/B phase signal; installation: fixed or revolving type — flexible for different test fixture configurations.
- Repairable and maintainable design — no need to repurchase when worn; compatible with Cometech universal testing machines as a primary elongation measurement accessory.
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Overview
The Cometech QC-551 Long Extensometer is specifically designed for high-elongation materials that exceed 20% elongation during tensile testing — including rubber, thermoplastic films, PE, fabric, and webbing — where a standard clip-on gauge would run out of travel before specimen break.
The extensometer clamps onto the dumbbell-shaped specimen and remains attached throughout the entire test, automatically detecting deformation when connected to a Cometech universal testing machine, eliminating the need for manual removal mid-test.
Two stroke variants are available — 700mm (standard) and 1100mm (extended) — both at 0.025mm resolution with a gauge length adjustable from 10 to 50mm to match different specimen geometries and test standards.
Key Features
- Designed for materials with >20% elongation — rubber, plastic, PE, fabric, webbing, and similar high-stretch specimens.
- Remains clamped during full test to specimen break — no mid-test removal required.
- Two stroke options: S (standard) = 700mm; L (extended) = 1100mm — covers light to extreme elongation scenarios.
- Resolution: 0.025mm — suitable for both slow creep and rapid elongation capture.
- Gauge length: 10–50mm adjustable — compatible with dumbbell-shaped specimens per ISO 37, ASTM D412, and similar standards.
- Specimen thickness range: 0.2–6mm — suitable for thin films through standard rubber sheets.
- A/B phase signal output — direct interface with Cometech testing machines.
- Fixed or revolving installation — adaptable to different test setups and gripping configurations.
- Repairable and maintainable design — cost-effective long-term ownership.
Full Specifications
| Model | QC-551 |
|---|---|
| Type | S: Standard | L: Extended |
| Resolution | 0.025 mm |
| Test stroke | S: 700 mm | L: 1100 mm |
| Gauge length | 10–50 mm |
| Specimen thickness | 0.2–6 mm |
| Signal output | A/B phase signal |
| Installation type | Fixed or revolving |
| Compatible machines | Cometech universal testing machines |
| Applicable materials | Rubber, plastic, PE, fabric, webbing — elongation >20% |
| Industries | Rubber, Polymer, Packaging, Textile |