Visco-elastic sealing for valve chest protection is a new type of high-performance visco-elastic polyolefin material. It preserves the dual characteristics of the solid adhesive material and liquid adhesive material. In normal conditions, its visco-elastic property will remain above 30 years. This product has excellent visco-elastic, sound water-proof, and easy-used characters.
Features:
— Permanent inflow behavior to steel, even at freezing temperatures
— Thermally stable-45℃ to 70℃ atmospheric
— Physically, mechanically, chemically stable
— Excellent adhesion on metal and materials like PE, PP, FBE
— Water and gas-tight
— Non-crystalline
— Self-repairing
— No stress generation
Application procedure
Visco-elastic sealing can be used to protect the valve from corrosion. Normally viscoelastic anticorrosive tape and viscoelastic anticorrosive paste are used together. The specific operation process is as follows: fill the valve with viscoelastic anticorrosive paste. The grooves and bolts of flange parts are filled by hand press. Then wrap the valve surface with viscoelastic anticorrosive tape. It is also necessary to wrap cold-applied PE or PP tape on the outer surface as the outer protective tape if the valve needs to be buried.
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 |
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