How to distinguish the quality of non-metallic expansion joints

There are two kinds of materials for non-metallic expansion joints, one is fabric expansion joint and the other is rubber expansion joint. Here, we will learn how to distinguish the quality of non-metallic expansion joints.
 
If distinguished from the material, the rubber expansion joint depends on the material of rubber, which is smooth and delicate, with good elasticity in hand. Non-metallic fabric expansion joints, mainly according to the use of the working environment to determine the fabric skin material needs to be selected in accordance with the working environment.
 
First of all, the factors that determine the quality of rubber expansion joint is the material, good rubber to make a good rubber expansion joint, some rubber expansion joint damping performance is not good, some of the first cracks after a period of time, aging is more serious, these are because of the use of poor rubber, the method of distinguishing the rubber compensator material is placed in the sun or light, look at its color, poor rubber in order to imitate the good rubber The effect will be after the oil treatment, the color is black, bright, while the good rubber will show a natural rubber color.
 
Second, it depends on the production process, a good rubber expansion joint using the elasticity of rubber, high airtightness, media resistance, weather resistance and radiation resistance and other advantages, the use of hot and cold stability of polyester cord fabric and the composite, after high pressure, high temperature mold vulcanization. In addition, the rubber expansion joint is also added to the rubber layer at both ends of the steel wire ring, which further improves the performance of rubber and increases the service life.