Polyurethane
Polyurethane is a highly versatile, robust material that is superb for pipeline pigging wear parts
Propipe Limited uses PolyPro-3 MDQ (PP-3) to produce all polyurethane components. This material is a polyester based three-component polyurethane elastomer system that has an excellent level of physical properties. It has a high tensile and tear strength, outstanding abrasion resistance plus a high level of resistance to oils, fuels and weathering.
For most pipelines, wet and dry: coated or uncoated, PP-3 provides long pig life with excellent performance for up to 800km. It is the system that is used in most pipeline pre-commissioning and commissioning operations.
65° Shore A applies to Bi-Di Sealing Discs, these discs require good flexibility and low abrasion loss
75° Shore A is a mid-range hardness, this is generally used for standard and conical cups, as well as combined sealing/guide discs.
85° Shore A is used for Bi-Di Guide Discs, giving a more rigid and tough component which aid support throughout the pipeline
95° Shore A hardness is generally used for the manufacture
of circular and triangular brushes, as well as specialist
guiding noses.
Material Characteristics
- Mercury free quasi MDI technology
- Ester formulated polyol
- Exceptional abrasion and tear resistance
- Very good resistance to hydrolysis
- Good resistance to chemicals (hydrocarbons, oils, solvents)
- Good mechanical properties at low temperature
The table below gives typical physical properties.
|
HARDNESS |
DIN |
Unit |
65 |
75 |
85 |
95 |
|---|---|---|---|---|---|---|
|
SHORE |
||||||
|
10% Modulus |
DIN 53504 |
MPa |
0.6 |
0.9 |
2.1 |
6.0 |
|
100% Modulus |
DIN 53504 |
MPa |
2.6 |
3.9 |
7.0 |
13.8 |
|
200% Modulus |
DIN 53504 |
MPa |
3.9 |
6.2 |
10.7 |
17.7 |
|
300% Modulus |
DIN 53504 |
MPa |
5.6 |
9.1 |
14.8 |
21.5 |
|
Tensile strength |
DIN 53504 |
MPa |
41 |
51 |
47 |
37 |
|
Elongation at break |
DIN 53504 |
% |
560 |
535 |
530 |
510 |
|
Tear strength : without nick |
ISO 34-1 |
kN/m |
56 |
74 |
106 |
142 |
|
Tear strength : with nick |
ISO 34-1 |
kN/m |
22 |
27 |
38 |
72 |
|
Resilience |
DIN 53512 |
% |
42 |
38 |
30 |
36 |
|
Abrasion loss |
ISO 4649 |
mm³ |
30 |
30 |
40 |
40 |
|
Compression set (deflection |
ISO 815-1 |
% |
17 |
18 |
20 |
31 |
|
Hardness at -5°C |
DIN 53505 |
Shore |
68 |
78 |
90 |
99 |
|
Hardness at 80°C |
DIN 53505 |
Shore |
61 |
70 |
83 |
95 |
|
Specific gravity |
- |
- |
1.21 |
1.21 |
1.22 |
1.24 |
