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.

QQ图片20170510172853.png

Property

Items		Hydrophilic rubber
Items		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

Features

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.

HONGRUI

Property

Features