MaTestLab > ASTM Methods > Polymers and Plastics > ASTM D5420 Standard Test Method for Impact Resistance of Flat, Rigid Plastic Specimen using a Striker Impacted by a Falling Weight (Gardner Impact)
ASTM D5420 Standard Test Method for Impact Resistance of Flat, Rigid Plastic Specimen using a Striker Impacted by a Falling Weight (Gardner Impact)
ASTM D5420 measures the impact resistance of rigid plastic and flat samples with a falling weight (Gardner impact) device. The technique can be used to determine how strong a material is likely to fail under high-velocity impacts, explaining both durability and toughness in plastic materials in real-life situations. The test replicates forced drops, impacts, or hits that plastics can be subjected to when handled, transported, or in use. It is widely used in quality control, material development, and comparative performance benchmarking within the plastic formulation industry. The findings help manufacturers make informed choices of materials where high impact strength is required, such as in automobile panels, appliance housing, and packaging parts.
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ASTM D5420 Introduction
ASTM D5420 has applications in various industries where plastics are expected to withstand loads or be prone to impacts, such as the automotive, construction, packaging, and electronics industries. This method is commonly used to determine the impact resistance of rigid plastics by modeling a force of high and sudden concentration triggered by a striker that falls. The Gardner impact test simulates the conditions that could occur when an item is dropped or struck during transportation or operation.
ASTM D5420 Test Method
Apparatus
Falling weight impact tester with guided drop tube and interchangeable strikers
Specimen Support
Flat anvil or support ring, depending on test configuration
Test Procedure
Drop a striker of known weight from a defined height onto a horizontal specimen
Measured Outcomes
Cracking, indentation, puncture, or complete breakage
Data Output
Pass/fail results, energy to failure (Joules or in-lb), or critical height
ASTM D5420 Equipment and Sample Preparation
Specimen Details
Flat, rigid plastic specimens, often molded or machined to the required size
Specimen Preparation
Ensure uniform thickness and smooth surface; condition per ASTM D618
Specimen Dimensions
Standard size: 127 mm × 127 mm with a thickness between 1.3 mm and 13 mm
ASTM D5420 Results and Interpretation
The result values are typically presented as the energy (in inch-pounds or joules) required to induce failure. The bigger the impact energy, the more rigid the material. The failure mode (e.g., puncture, cracking, or complete fracture) can also be a result. Several specimens are used, and their average impact resistance is ascertained to be statistically relevant.
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ASTM D5420 Related Test Methods
ASTM D256 (Izod Impact Tests) is the most used method of testing the impact strength of notched specimens, and ASTM D4812 is used to measure the unnotched impact resistance of the cantilever beam, which is used to determine the overall toughness of a material.
ASTM D5420 Applications in Industry
This method is used to control the quality and development of materials in automotive panels, building boards, appliance housing, and rigid material packaging. The manufacturers use it to ensure that the materials can withstand unintentional impacts during their service life without affecting performance or safety.
ASTM D5420 Materials Commonly Tested
Types of material commonly tested with this method are rigid PVC sheets, widely used in the construction and sign industries due to their durability. Polycarbonate panels, with high impact and clarity resistance, as well as ABS and acrylic plastics, are commonly used in the automotive, appliance, and consumer products industries. The technique can also be applied to filled polypropylene boards, which offer a combination of enhanced stiffness and impact resistance, as well as fiber-reinforced thermoplastics that provide a blend of strength, toughness, and weight suitable for targeting applications where structural use is required.
ASTM D5420 Common Challenges and Troubleshooting
The difficulties are the irregular perception of failure, differentiation in the calibration of drop height, and marginal effects on the specimens. The controls for flatness and proper mounting, along with tests run in a controlled environment, also increase reliability.
ASTM D5420 Safety and Best Practices
Do not use a falling-weight gadget without a guard, as injuries may occur. Protect your eyes and avoid touching the drop zone during the test. The striker height and mass must be regularly calibrated to give reproducible and reliable measurements.
Importance of ASTM D5420 Test Standard
This test procedure provides the necessary information to determine the expected behavior of a plastic under the impact of mechanical shocks, which are typically abrupt and may originate from collisions, drops, or strikes. Examples of this can be found in real-life applications. It is particularly useful within the automotive, packaging, construction, and consumer goods sectors, as the durability and safety of the product are critical.
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Where can I get the astm d5420 tested?
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