Volume-II - GAIL

Sl. No. Properties Units Requirement Test Method
(iii) Specific Gravity @+25°C - 0.926 min. (MDPE)
0.941 min. (HDPE)
ASTM D 792
(iv) Hardness @+25°C Shore D 50 min. ASTM D 2240
(v) Water Absorption, 24 hours,
@+25°C
% 0.05 max ASTM D 570
(vi) Volume Resistivity @+25°C Ohm-cm 10 15 min ASTM D 257
(vii) Dielectric withstand,1000
Volt/sec rise @+25°C
Volts/ mm 30,000 min ASTM D 149
(viii) Vicat Softening Point °C 110 min. ASTM D 1525
(ix) Elongation % 600 min. ASTM D 638
(x) Oxidative Induction Time in
Oxygen at 220°C, Aluminium
pan, no screen
(xi) Environmental Stress Crack
Resistance
(ESCR) (for F50)
Medium Density, Condition
“C”
High Density, Condition “B”
Min 10 ASTM D3895
Hours
300
300
ASTM D1693
(xii) Carbon Black Content % 2 min. ASTM D1603
5.3.3 Properties of Coating System
Sl. No. Properties Unit Requirement Test Method
(i) Bond Strength (using Type 2
Test Assembly i.e.
Dynamometer)
@ 20±5°C
@ 60±5°C
(ii) Impact Strength (min. of 30
impacts on body along the
length. No breakdown allowed
when tested at 25 kV)
(iii) Indentation Hardness
@ 23±2°C
@ 70±2°C
GAIL (INDIA) LIMITED
Kg/cm
Joules per
mm of
coating
thickness
mm
3 – LAYER POLYETHYLENE
COATING OF LINEPIPES
8.0 min
5.0 min.
7 min
0.2 max
0.3 max
DIN 30670
DIN 30670
DIN 30670
(iv) Elongation at Failure % 300 min. DIN 30670
(v) Coating Resistivity (*) Ohm-m 2
10 8 min. DIN 30670
GAIL-TS-COATING-3LPE
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