Adhesive plastic
ADHESIVE PLASTIC FOR THREE-LAYER COVERING SYSTEM OF PIPES (3PE) provides durable adhesion between epoxy primer and outer PE protective layer. It is applied to pipes covered by epoxy primer according to the extrusion method. It has strong adhesion both to epoxy primer already solidified and to that being in the process of solidification, for instance Scotchkote 226N Slow 11G, Primer L4098, InfralitEP 8024-07, OXTEK-3 primer.
Adhesive plastic characteristics:
Typical properties |
Value |
Test methods |
Density, g/cm³ |
0.94 |
GOST 15139 |
Melt flow index (190º C, 2.16 kg), g/10 min. |
1.8-2.5 |
GOST 11645 |
Tensile strength, MPa, min. |
12 |
GOST 11262 |
Relative elongation, %, min. |
450 |
GOST 11262 |
Softening temperature, Vicat, ºC, min. |
90 |
GOST 15088 |
Adhesion to epoxy primer, N/cm of length, min. at test temperatures: |
|
GOST 411 Method A |
+ (20±5)ºC |
180 |
|
+ (60±3)ºC |
110 |
|
+ (80±3)ºC |
70 |
Examples of plastic adhesive characteristics* on steel:
Typical properties |
Norm for three-layer covering |
Adhesion to steel, N/cm of length at test temperatures: |
|
+ (20±5)º C |
170 |
+ (60±3)º C |
100 |
+ (80±3)º |
70 |
Adhesion lowering to steel, % of initial value, max. after 1000 hrs exposure in water at temperatures: |
|
+ (20±5)º |
25 |
+ (60±3)º C |
30 |
Area of layer cathodic delamination, max. cm² after 30 days of tests in 3 % NaCl solution at the following temperatures: |
|
+ (20±5)º C |
3,5 |
+ (60±3)º C |
8,5 |
*As Epoxy primer Scotchkote 226N Slow 11 G (0.1 mm), adhesive plastic (0.2 mm) was used. As outer protective layer: HDPE 273-79 (2 mm).