Comparison of FNCT vs. PENT as commonly Used Test Methods for ESCR Performenc of HDPE [PE]

# 2010 Vancouver

Companies of LyondellBasell FNCT (Full Notched Creep Test, ISO DIS 16770-3) and PENT (Pennsylvania Notch Test, ASTM F-1473) are commonly used test methods to measure the stress-crack resistance of polyethylene resins used in pressure pipe applications. FNCT test is primarily used in Europe whereas the PENT test is used in North America. The advent of high-performing bimodal and multimodal polyethylene resins has resulted in a step-change increase in FNCT and PENT failure times. End-use applications have also begun to incorporate requirements that represent a higher level of performance. For instance, in Europe the DVGW requirement for sandless bedding of water pipes requires FNCT > 2700 hours, and proposed regulations for PE pipe in nuclear plant secondary cooling-water applications in North America require PENT > 2000 hours. Accelerated versions of the FNCT test have been developed to reduce failure times by an order of magnitude. An increase in stress and or temperature in the PENT test provide a smaller degree of acceleration. An investigation into the potential correlation of PENT failure times with accelerated FNCT test failure times is conducted in this paper, in order to determine whether the FNCT test can be used as a QC tool for high-performance polyethylene pipe resins.

Please note that the whole article content is available on PPCA website onlySource : 2010 Vancouver

Related papers


Author(s) : Kim Endsley, Joseph Poniatowski 2016 Berlin

In order to free itself from the rising costs of water supplied by the Detroit Water and Sewerage Department, the Karegnondi Water Authority proposed a new water intake and delivery system from Lake Huron to Flint, Michigan. Because of the recent introduction of the zebra mussel into North America’s Great Lakes, a...

Development of an enhanced chlorine resistant antioxidant package for potential use in polyethylene using a rapid LC-MS technique

Author(s) : Joseph Sebastian 2012 Barcelona

The development of an antioxidant package for chlorine resistance of polyethylene pipe is a time-intensive exercise. The usual testing protocol consists of compounding a number of different additive packages into polyethylene, preparing molded samples and then aging these samples in a sodium hypochlorite bleach...

Taking Slow Crack Growth - Rapid Crack Propagation Balance of Biomodal PE100 Resins to the Next Level

Author(s) : Reinking, Mehta, Garrison, Joseph, Schwab 2006 Washington DC

Bimodal polyethylene (PE) pipe resins have demonstrated a step change in slow crack growth (SCG) and rapid crack propagation (RCP) resistance over conventional unimodal polyethylene resins. Literature shows that homopolymer polyethylene has higher RCP resistance than PE copolymers, which suggests a trade-off...

Pressure Fatigue Testing of Plastics Pipes

Author(s) : Joseph 1979 Brigthon

The construction of apparatus for cyclic pressure fatigue testing of 60 mm and 168 mm diameter plastic pipes is described. The results of tests at 1 Hz at 20°C and at 10°C at various stress amplitudes and mean stress levels are given for 60 mm diameter uPVC pipe. A comparison is made between specimen lifetime and...

Members of the Association

BOREALISBOROUGEINEOS O&PIRPCKorea Petrochemical IND. Co., LTDLyondellBasellPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE