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Viscoelastic Wrapping Band products are designed to prevent corrosion by adhering effectively to steel and both factory and field-applied pipeline coatings. These non-toxic, cold-applied wrap coatings are prefabricated and based on pure homopolymer. This low-viscosity, non-crystalline, non-crosslinked (fully amorphous) compound provides excellent protection for pipelines.
Features:
• Controlled cold flow providing permanent inflow into the finest pores of the substrate
• Resistant to low temperatures without getting brittle
• Conforms to irregular shapes
• Low surface tension; adheres on many types of dry substrates at a molecular level
• Self-healing of small dents, voids and cracks
• Inert to aging and weathering
• Resistant to many chemicals like water, salts, acids, alkalis, and polar solvents.
Application:
Visco-elastic materials can be used in valves, pipes, vessels, field joints, fittings, and pipe repair and rehabilitation for sealing and corrosion protection.
Performance:
Item | Test method | Performance |
color | Visual estimation | green |
thickness | ISO21809-3 | ≥1.8mm |
Glass transition temperature | ISO11357-2 | -20℃min |
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 23℃ | ISO21809-3 | 0.027 N/mm2 |
Lap shear strength at 70℃ | ISO21809-3 | 0.005N/mm2 |
Impact resistance | EN12068 | 15 J |
Indentation resistance | EN12068 | 0.6mm remaining |
Self healing | ISO 21809-3 | <24 hours@23℃ |
Cathodic disbondment resistance at 23℃ | ISO21809-3 | 0mm self healing <24 hours |
Cathodic disbondment resistance at 70℃ | ISO21809-3 | 0mm self healing <24 hours |
Electrical resistance | EN12068 | >10^15 ohm/cm |
Low temp. Flexibility @-30℃ | EN12068 | No separation, tears or cracks |