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Tunnel segment gasket has two types of materials: EPDM and hydrophilic rubber. The general shape of porous can reduce the compression assembly stress, has good resistance to compression stress relaxation performance, can prolong the service life of the rubber sealing pad. It has double performance of water swelling : elastic sealing and water expansive.
Items | Hydrophilic rubber | ||||
PZ-150 | PZ-250 | PZ-400 | PZ-600 | ||
Hardness Shore A | 42±7 | 42±7 | 45±7 | 48±7 | |
Tensile strength Mpa ≥ | 3.5 | 3.5 | 3 | 3 | |
Elongation %≥ | 450 | 450 | 350 | 350 | |
Expansion rate % | 150 | 250 | 400 | 600 | |
Repeated immersion test | Tensile strength Mpa≥ | 3 | 3 | 2 | 2 |
Expansionary % | 350 | 350 | 250 | 250 | |
Expansion rate % ≥ | 150 | 250 | 300 | 500 | |
Low temperature brittleness (-20℃x2h) | No crack |
Items | EPDM | |
Hardness Shore A | 60±5 | |
Tensile strength Mpa ≥ | 15 | |
Elongation %≥ | 450 | |
Compression set (-70℃x24h) %≤ | 25 | |
Low temperature brittleness ℃≤ | -50 | |
Hot air aging (-70℃x96h) | Tensile strength Mpa≥ | 12 |
Elongation % ≥ | 350 | |
Hardness change ≤ | ±10 |
1) Co-extruded rubber
2) Excellent flexibility and good resistance to aging, chemical medium and ozone
3) Play a good waterproof performance and weather resistant property in a big temperature range
4) Profiles could be designed according to concrete segment structure
5) Hydrophilic EPDM sealing gasket gives a “double-insurance” sealing to the concrete segment. Once EPDM gasket is leaked, hydrophilic rubber strip will slowly expand by swelling water to prevent water in, playing a second waterproof role.