ASTM D575-91
Standard Test Methods for Rubber Properties in Compression
ASTM D575 is a testing standard used to determine the stiffness of rubber materials in compression. It allows rubber suppliers to characterize the stiffness of the material they produce, helping downstream manufacturers source the correct material for their components. Data collected from ASTM D575 testing is important for applications involving elastomeric materials subjected to compressive stresses. One wide-ranging application is the sealant industry — due to its ease of extrusion and flexible nature, rubber is a commonly used material for sealants.
Method A applies a predetermined deflection to the cylindrical specimen, at which the resulting force is recorded. Alternatively, Method B applies predetermined minor and major forces to the specimen, and deflection is measured.
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Materials Testing System | Optional Accessories | Tips and Tricks
Materials Testing System
Standard At A Glance
Materials
- Elastomers
Test Types
- Compression
Standard
- ASTM D575
Depending on maximum expected forces, ASTM D575 is performed on a single-column or dual-column universal testing system, such as Instron's 3400 and 6800 Series systems. This system setup requires a matching load cell and upper and lower platens with diameters larger than that of the specimen. Platens should have rigid connections to the frame and load cell, and must be rated to a load capacity that exceeds the forces generated during the test.
Optional Accessories
Though not required by the standard, parallelism can be ensured by including an integral spherical seat on the upper platen. Crosshead displacement measurements are adequate for ASTM D575, but those interested in the most accurate deflection measurement should consider using a 2601-04x Series linear variable displacement transducer (LVDT).
| ASTM D575 Accessories | |
|---|---|
| Self-Aligning Spherical Seat | |
| 2601-04x Series LVDT | |
Tips and Tricks
- For the most accurate deflection measurements, we recommend a 2601 Series LVDT attached to the platen itself, rather than using crosshead displacement measurement. If crosshead position is used, it's important to use Corrected Displacement in Bluehill Universal to prevent error from machine compliance.
- Is platen-to-platen parallelism important to your lab? If so, compression platens with integral spherical seats are ideal for ensuring parallelism.
- If performing ASTM D575 Method B with an Instron machine, be aware that a force hold is a requirement of the test. Similar to longer creep or stress-relaxation tests, holding force requires the load cell's transducer settings to be tuned to the effective stiffness of the test setup, which includes the specimen itself and any fixturing.
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