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How to recoginze the butyl rubber inner tube?

How to recoginze the butyl rubber inner tube?
Update Time:2019-07-28

The methods to recognize the butyl rubber inner tube : 


The inner tube body has color line with width no less than 2mm .


1. Butyl rubber inner tube, there should be blue line on its circumference.


2. Butyl rubber and halogenated butyl rubber inner tube there should be green line on 

its circumference.


3. Butyl rubber and EPDM rubber inner tube, there should be red line on its circumference.