300*8 300*10 350*10......
Centrally placed expansion/ Centrally placed construction/
Externally placed construction joint

Material: caoutchouc or synthetic rubber with high quality.
Characteristic: with high elasticity, compression deformation performance of rubber, water-stop and shockproof,resist-aging,resist-heat and cold.also used for long time and much area.
Used:  enginery, tunnel ahead, deformation gap.
To prevent the avulsions of the rubber joints or hole from rupturing,