RILSAN® Polyamide 11 in Oil & Gas Off - HCL Fasteners Ltd

18
DATA AT 70°C
Time (days) Stress at rupture (MPa) Elongation at rupture (%)
0 53 ± 0.86 438 ± 13
1 31.9 ± 2.58 419 ± 25.1
2 32.8 ± 3.43 419 ± 32.8
8 33.7 ± 2.48 432 ± 19.6
42 34.9 ± 3.02 440 ± 22.7
120 33.8 ± 4.3 460 ± 44
160 33.1 ± 3.8 442 ± 30
2000 (5 1/2 years) 32 ± 5 320 ± 40
The plasticizer is extracted after 2 hours at 70°C. The strong plastification effect of
methanol more than compensates for the plasticizer loss. The material becomes more
flexible. At 70°C, Rilsan ® PA11 is not significantly degraded.
All these factors lead to the following picture for a service life – temperature relationship:
LIFETIME (DAYS)
100000
10000
1000
100
10
1
Fig. 12 Polyamide 11, BESNO P40 grades – lifetime in methanol contact
■■■ 20 YEARS ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
120 110 100 90 80 70 60 50
TEMPERATURE ( °C)
water, pH=7
methanol