| Main Raw Material: | Polyurethane |
|---|---|
| Appearance: | Liquid |
| Method: | Spray |
| Tensile Strength: | 26MPa |
| Transport Package: | Drum |
| Specification: | 210L |
| Samples: |
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| Customization: |
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The gas & oil pipelines usually go through complex geological structures and changeable climate zones. The geological structure changes caused by different climate, soil corrosion as well as the displacement and deformation which will greatly damage the buried pipelines. STWD9517 gas & oil pipeline special spray polyurethane coating has excellent comprehensive physical and stable anticorrosion properties which has gained great comment from the designers and applicators and then promoted it into more projects of gas & oil pipelines. STWD Urethane Co., USA developed gas & oil pipeline special rigid polyurethane coating early in the 1970s and has been successfully applied in many areas of the USA.
Characteristics It is high reactive and rapid curing and able to be sprayed forming on any bent surfaces of slopes and vertical side without sagging or falling down problems. The coating film is dense tough, flexible and not sensitive to humidity and temperature, high adhesive strength with substrate and cathodic disbondment resistant. It has excellent properties of anticorrosion, impact resistance and wearable, stable chemical resistance with acid, alkali and salt and effective resistance erosion of microorganism and plant roots without crack or peel off after long-term application.
Technical parameter
Specific gravity of part A 1.20
Specific gravity of part A 1.05
Viscosity of part A (23ºC) 800-1000 mPa.S
Viscosity of part B (23ºC) 700-800 mPa.S
Solid content ≥98%
Temperature heated of part A 60-65ºC
Temperature heated of part B 60-65ºC
Temperature heated of hoses 60-65ºC
Static pressure of part A 2200-2500PSI
Static pressure of part B 2200-2500PSI
Allowed pressure difference of A & B ≤300 PSI
Gel time 35S
Surface dry time 70S
Re-spray time ≤20 minutes (roughen the surface if exceed 20 minutes)
Physical properties
| Hardness (GB/T 2411) | Shore D68-72 |
| Tensile strength (GB/T 528-1998) | ≥26MPa |
| Elongation rate (GB/T 528-1998) | ≥10% |
Adhesive strength (ASTM D4541)
Sand-blasted surface with primer 13-15 MPa
Sand-blasted surface without primer 10-12MPa
Abrasion resistance(ASTM D4060) ≤10mg
Cathodic disbonding resistance (ASTM G95) ≤8mm
Impact resistance (ASTM D2794) ≥10J
Salt spray test (ASTM B117) 2000h
Water absorption rate ASTM D570) ≤2%
Spark resistance test (GB7993) 15000v/1mm
Temperature variation resistance (GB/T 9278) +150---- -50ºC
Chemical resistance (ASTM D714)
Acid resistance: 30% H2SO4, 30d no rust, no bubbles, no peel off
Alkali resistance: 30% NaOH, 30d no rust, no bubbles, no peel off
Salt resistance: 50 g/L NaCL, 30d no rust, no bubbles, no peel off
Oil resistance
0# diesel oil, oil, 30d Salt resistance: 50 g/L NaCL, 30d
Application scopes
Anticorrosion protection of buried pipelines of gas & petrochemical industry and anticorrosion protection of bridge pier.
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