Analyze the Impact Resistance of Low-Density Plastic Films with Free-Falling Dart

Free-falling dart impact test is a traditional way used to measure the impact resistance strength or actual density of the plastic or polyethylene films. This test uses a single dart configuration which is dropped from a determined standardized height, whereas the weights of the dart can be varied as per the specification of the sample. The free-falling dart test is performed on the samples for quality evaluation and quality control and also for end use comparisons in research centers. The test can be performed with the highly standardized testing instrument i.e. Dart Impact tester. 

The testing devices help to determine the actual energy that causes Polyethylene films to fail under some determined condition due to the effect of the free-falling dart. The energy is expressed in terms of mass of the dart which is dropped from a specific height and results in more than or equivalent to 50% of sample failure. The Dart Impact Tester comprises of a hemispherical dart with a diameter of 38mm and 51mm and can be dropped from two standardized heights i.e. 660mm and 1550mm respectively (as suggested in Test method A & Test Method B according to ASTM D1709).

Presto Stantest one of the renowned manufacturers in the world of testing instruments. To test the sample using Dart Impact Tester, the sample is clamped pneumatically on the base plate on the provided sample placement area. The samples are then impacted after determining the starting point and weight of the dart. After the dart is released, the sample is examined visually for Pass/Fail test. The instrument is designed as per standards IS 2508:1984(R2003) and ASTM D1709-16A.

Technical Specifications of Dart Impact Tester

• Inside diameter of clamp: 127mm
• Release Mechanism: Electro Magnetic
• Diameter of dart head for Method A – 38 mm
• Diameter of dart head for  Method B – 50 mm
• Height of fall :660 mm and 1524 mm(Adjustable)
• Maximum weight holding capacity : 2Kg
• Least Count:  1 mm
• Type of test: Free-Falling
• Clamping Unit: Circular annular clamping
• Dart Releasing Mechanism: Electromagnetic dart mechanism for hold/release
• Counter: Digital
• Electrical Requirement: Single Phase 220 V AC
• Built on a rigid metallic base.
• Strong Electromagnetic dart holder.
• Dart released at the press of a button.
• Reliable, the fast and accurate measurement of variable heights.
• Electromagnetic Hold and release mechanism for dart
• Vacuum Pump: As an optional accessory

For more information on Presto’s Dart Impact tester, contact our experts.