However, due to limitations of the Bent Strip ESCR method, several alternative ESCR tests have been developed for use in the United States and Europe including Pennsylvania Notch Test
(PENT), Full Notch Creep Test (FNCT), cone test and notch pipe test (NPT) .
Its resistance to slow crack growth is demonstrated by results of the FNCT (>8,760 h) and pipe notch test
(>8,760 h, DIN and ISO 13479).
It boasts excellent resistance to slow crack growth, a critical property for long-term service life, with failure times in excess of 15,000 hr in the Pennsylvania Notch Test
Pennsylvania Notch Test
(PENT test) comparison: The team raised the minimum requirement "bar" for material crack growth resistance by requiring a minimum of 500 PENT hours, compared to 100-hour PENT minimum specified by ASTM.
Because of such constraints, numerous studies have conceived the idea of using notched specimens, such as full notch creep tests (FNCT) [5, 6], double edge notch tests
(DENT) , the Pennsylvania edge notch test
(PENT)  and the circumferentially notch tensile test (CNT)  to accelerate the fracture while still providing an accurate assessment of the material resistance.
Its superior resistance to slow crack growth is demonstrated by results of the FNCT (>8760 h) and pipe notch test
(>8760 h, DIN and ISO 13479).
This is illustrated in Table 4, in which for series B the results of the blunt notch test
ISO/TC138-SC4 Notch Test
Group tests which have been carried out on this pipe show no measurable loss of performance," he said.
A number of different test methods such as the Pennsylvania Notch Test
, Full Notch Creep Test  and Double Edge Notch Test
 have been invoked by different workers in an attempt to characterize the long term slow crack growth properties of polyethylene.
Using traditional notch tests
, it would take many months to prove that a new material meets, for example, the highly-demanding requirements of PAS 1075.
Measurement of fracture toughness or the J-integral was also carried out for single or double edge notch tests