Creep Tests for Polymer Materials



Increase of deformation to result in fracture of a plastic product is sometimes observed when a stress is applied to a plastic product for a log time even if the stress is less than the yield stress. Such deformation proceeding under a constant stress with time is called Creep. Creep property of polymer materials can be evaluated by loading a less constant stress than a yield stress to a polymer specimen for a certain period.

Test methods

Test method Tensile creep Flexural creep Compressive creep
Apparatus CP6-L-250 CP6-L-250 CP6-L-500S
Load range 1~2500N 1~500N 1~4900N
Temperature range RT~250℃ RT~250℃ RT~150℃
Humidity range 30~96%RH 30~96%RH none
Maximum stroke 50mm 50mm 50mm
specimen Specimen for tensile test Specimen for flexural test
80×10×4 (mm)
Plane specimen
(Thickness ≧ 3mm)
Test standard JIS K7115 ASTM D2990 JIS K7116 ASTM 2990


Thermoplastic resins :PE, PP, NY, PBT, ABS, PC, PPE, etc.
Thermosetting resins : Epoxy resin, Unsaturated polyester resin, etc.
Composite materials : GFRP, etc.

Example:The Tensile Creep Test of A Glass Fiber Reinforced PP

Fig.1 Creep strain versus time curves Fig.2 Time-to-Failure curves

Search Number 6I007

Download The Technical Note of This Exapmle.

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