Falling Dart Impact Tester
The falling dart impact tester determines the impact resistance of thin flexible materials, such as plastic films, plasticised papers and composite sheets by the free falling dart method.
The apparatus establishes the energy required to tear film specimens under specified conditions of impact of the free falling dart. The energy is expressed in terms of the weight of the dart when 50% of the film specimens fail under the conditions specified.
The sample is held down by a pneumatically operated clamp. A range of weights is provided to enable tests to be performed on various film thicknesses. The working range of the weights is established by finding the weight that will just break the sample film.
Three model options are available:
Model A: Complies with BS 2782 Part 3: Method 352E and ASTM D1709 Method A. Single dart drop of 660 mm and drop weights from 1 g up to a total of 1640 g. The sample is held down by a vacuum and clamping ring. A 20 g dart is supplied suitable for testing thin film and the edge of tubular film of low impact strength.
Model B: Identical to Model A except that the sample is held down by a pneumatically operated clamp suitable for film thicknesses greater than 250 microns. For safety reasons, the full clamping pressure can only be applied when both the operators hands are completely clear of the clamping system.
Model C: Complies with BS 2782 Part 3: Method 352E and ASTM D1709 Methods A and B. Two dart drop height, 660 mm and 1525 mm. Additional darts and weights up to 1210 g.
Features
• Simple set up, operation and maintenance
• Complies with international standards
• Pneumatic clamping for stronger films
• Automatic release of dart at correct angle
• Dual height option
• Floor mounted system
• Heavy-duty, robust construction