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How to distinguish the material of flange loose sleeve expansion joint

Flange loose sleeve Expansion joint As the flexible connection of the pipeline, its purpose is to better solve the first problem of the pipeline. For example, when it is cold in winter and hot in summer, the thermal expansion and cooling of the pipeline is obvious, the distance between the pipeline and the pipeline changes, and the more important is the increase of the force between the pipeline and the pipeline. The big difference of the loose sleeve expansion joint is not in the appearance but in the inside, because the internal quality has a very important relationship with the life of the loose sleeve expansion joint. So today, let the technical personnel of Huanjing introduce several common and simple physical and chemical methods to identify the material of loose sleeve expansion joint.

1. Medium weight gain resistance test: after the finished product is sampled and soaked in the selected medium, the main body quality of the loose sleeve expansion joint is determined by observation after the time change is limited. In 100 ℃ oil for 24 hours, the change rate of mass hardness of NBR, fluororubber? Eco and Cr is not obvious, but NR, EPDM, SBR will have weight gain and hardness change, and volume will expand

2. Combustion identification method: a small number of samples are tested. Normally put in the air to burn, and then observe the phenomenon. Generally, fluorine rubber, Cr and CSM will not continue to burn after leaving the flame, and the combustion flame is extremely small, and the flame of NR and epdn are larger. Of course, in professional stores, the smell is related to the color and the state of burning

3. Air aging test: take samples from finished products and put them into the aging chamber for one degree. It is observed and judged that Cr, NR and SBR will break at 150 degrees, NBR will have elasticity, ordinary NBR at 180 degrees will have brittle fracture, EPDM will have brittle fracture at 230 degrees.

4. Measurement of specific gravity: use electronic scale and high-precision balance to calculate their specific gravity. For example, the specific gravity of fluorocarbon will reach more than 1.8. The proportion of Cr and eco is more than 1.3

5. Low temperature determination method: sample the finished products, dry ice and alcohol are used to make low temperature environment, and the soft and hardness of different rubber can be felt after low temperature environment treatment.

Based on the above, you have a certain understanding of how to distinguish the material of Songtao expansion joint. If you want to know more about the loose sleeve expansion joint, you can consult us.

Shanghai Huanjing mainly produces expansion joint, loose sleeve expansion joint, flange loose sleeve expansion joint, etc. For example, it is more important to increase the distance between the pipe and the pipe when the pipe is hot and cold, for example, when the pipe is connected with the cold expansion joint, it is more important to increase the flexible joint between the pipe and the pipe. The big difference of the loose sleeve expansion joint is not in the appearance but in the inside, because the internal quality has a very important relationship with the life of the loose sleeve expansion joint.

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