ISO 18488:2025 pdf download,Polyethylene (PE) materials for piping systems — Determination of strain hardening modulus in relation to slow crack growth — Test method.
ISO 18488:2025 defines a procedure for determining the strain hardening modulus, which serves as an indicator of polyethylene’s resistance to slow crack growth.
It outlines how to derive a strain hardening modulus measurement from the “true stress versus draw ratio” curves obtained from compression-molded samples. Detailed information regarding the required equipment, precision standards, and sample preparation for data generation is provided.
This method is applicable to all varieties of polyethylene, regardless of the manufacturing technology, comonomer, or catalyst type employed in the production of pipes and fittings.