Geomembrane Tear Strength Tester

Compliance Standard

ASTM D 5397 - 93

Instrument Description

- Test 20 specimens at a time - Stainless - steel bath - Solid - state temperature controller - Circulating pump - Automatic low - liquid - level trip - Bath cover to reduce evaporation - Movable weight container - Digital timer and micro - switch - Bath motor drive device

Product Advantages:

The Geomembrane Tear Strength Tester (NCTL Tester) offers several key advantages for evaluating the stress crack resistance of geomembranes:

Accelerated Testing: The elevated temperature, surfactant solution, and sustained tensile load significantly accelerate the slow crack growth failure process compared to ambient conditions.

Quantitative Results: Provides objective, quantitative data in the form of time-to-failure for each specimen.

Standard Compliant: Designed specifically to perform the ASTM D 5397 NCTL test, ensuring results are comparable and accepted within the industry.

Multiple Specimen Testing: Allows for simultaneous testing of multiple specimens (20 in this case), improving testing efficiency.

Controlled Environment: Provides a stable and controlled test environment (temperature, surfactant solution) crucial for reproducible results.

Simulates In-Service Stress: Applies a constant tensile load that simulates the sustained stresses geomembranes experience in containment applications.

Technical Parameters:

Number of Test Stations: 20 (as indicated)

Bath Temperature: 50°C (as indicated)

Bath Temperature Control Accuracy: (Typically ± 1°C or better as required by ASTM D 5397)

Test Specimen Type: Dumbbell-shaped with a precision-scribed notch (as indicated and specified by ASTM D 5397)

Test Specimen Dimensions: (As specified by ASTM D 5397. including length, width, and notch depth)

Applied Load: Constant tensile load applied via weights and lever (load level is calculated based on material properties and cross-sectional area, as per ASTM D 5397)

Capacity for Lead Weights: (Sufficient to achieve the required stress levels for testing a range of geomembranes)

Bath Volume: (Sufficient to immerse all 20 specimens and the gripping devices)

Timer Range: (Capable of recording time up to several thousand hours, as NCTL tests can be very long)

Timer Accuracy: (e.g., ± 0.1 hour or better for long-term tests)

Test Solution: Surfactant solution (as specified by ASTM D 5397)

Power Supply: (e.g., AC 110V or 220V, 50/60 Hz)