ASTM D256 - Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics

ASTM D256 specifies standard test methods for measuring the impact resistance of plastics using the Izod pendulum test. This method evaluates the energy absorbed by a plastic specimen when fractured by a pendulum under specific conditions. It provides data on material toughness and brittleness, critical for applications where plastics are exposed to sudden impacts.

Scope:

1. Utilizes a pendulum-type impact testing machine with notched or unnotched specimens.
2. Measures the energy required to fracture the specimen, reported as energy absorbed per unit width of the specimen.
3. Specifies detailed procedures for specimen preparation, testing conditions, and result interpretation.
4. Includes provisions for evaluating the effects of temperature and other environmental conditions on impact resistance.

Applications:

1. Quality Control: Assesses the impact resistance of plastics in manufacturing processes.
2. Material Selection: Helps in choosing suitable materials for applications requiring specific impact properties.
3. Product Development: Supports research and development for enhancing polymer performance under impact.
4. Standardization: Ensures consistent testing and evaluation of plastic materials across industries.