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The viscoelastic anticorrosion coating series includes viscoelastic anticorrosion tape, viscoelastic anticorrosion paste, and polymeric outer protective tape. They are suitable for the anticorrosion of irregular components such as pipeline valves, flanges and tees; the joint coating of pipelines in water networks and tunnels; the repair of anticorrosion coatings and joint coatings for in-service pipelines; and other special fields.
Viscoelastic coating is used to safeguard valves against corrosion. Typically, viscoelastic anticorrosive tape and viscoelastic anticorrosive paste are used together. The specific operation procedure is as follows:
Fill the valve with viscoelastic paste.
Manually fill the grooves and bolts of flange parts with the visco-elastic paste.
Wrap the valve surface with viscoelastic anticorrosive tape.
If the valve is to be buried, it is also suggest to wrap cold-applied PE/PP/PVC tape on the outer surface as an additional protective layer.
| Item | Test method | Performance |
|---|---|---|
| color | Visual estimation | green |
| thickness | ISO21809-3 | β₯1.8mm |
| Glass transition temperature | ISO11357-2 | -20βmin |
| Crystallization temperature | ISO11357-3 | No evidence of crystallization |
| Holiday detection at 5KV/mm, max. 25KV | ISO21809-3 | No holiday |
| Drip resistance | ISO21809-3 | No dripping |
| Lap shear strength at 23β | ISO21809-3 | 0.027 N/mm2 |
| Lap shear strength at 70β | ISO21809-3 | 0.005N/mm2 |
| Impact resistance | EN12068 | 15 J |
| Indentation resistance | EN12068 | 0.6mm remaining |
| Self healing | ISO 21809-3 | οΌ24 hours@23β |
| Cathodic disbondment resistance at 23β | ISO21809-3 | 0mm self healing <24 hours |
| Cathodic disbondment resistance at 70β | ISO21809-3 | 0mm self healing <24 hours |
| Electrical resistance | EN12068 | >10^15 ohm/cm |
| Low temp. Flexibility @-30β | EN12068 | No separation, tears or cracks |
