Introduction to ISO 178
ISO 178 is an important test method that determines the compressive and flexural properties of plastics and specifies their behavior. The strength of materials and flexural modulus is determined. The performance evaluation is done and modifications are suggested. It provides data for research and aids in development and quality control along with specifying the applications of these materials. In this way, the ISO 178 test method defines the standard for the preparation and testing of plastic products along with observing the stress/strain relationship. MatestLab is one of the best testing service providers with the best network of testing laboratories in the USA to conduct ISO 178 tests for our clients.
ISO 178 Test Method
The method proceeds as follows:
| Load Application | ISO 178 involves setting up the apparatus consisting of a loading system, compressive platens, flexural test system, and micrometers. A specimen is measured and placed in a compressive fixture of a flexural rack. The deformation measuring devices are attached to the specimen and load is applied. |
| Data Analysis | The compressive strength and flexural modulus are determined based on the applied load and the change in specimen dimensions. |
ISO 178 Specimens
| Specimen Details | The ISO 178 specimens used are fiber-reinforced plastic compounds. |
| Specimen dimensions | The standard applies to compounds with fiber lengths ≤7,5 mm before processing. |
| Specimen Preparation | The ISO 178 specimens are cleaned and prepared as per requirements. |
ISO 178 Results
The results obtained from the ISO 178 test method facilitate the quality assurance and durability check of plastics by providing valuable insights into parameters such as flexural stress, flexural strain, and flexural modulus. They determine the strength and deformation behavior of semi-finished or finished products such as moldings, laminates, or extruded sheets.
Tests Related to ISO 178
ISO 178 is similar to other standard methods, such as ASTM D638 and ISO 604 used for determining the tensile and compressive properties of plastics respectively.
