How to repair a broken rubber hose
Many finished PU steel wire hoses differ in transparency. Some are as clear as glass. Others, though, look yellowed or whitish.
So why do PU steel wire hoses turn yellow?
First, antioxidants play a role. Today, many PU steel wire hoses use TDI or MDI as main raw materials. These substances undergo complex chemical reactions when exposed to light, heat, oxygen—especially UV rays. This creates chromophores, making the hose turn yellow. It can’t stay highly transparent for long.
Second, UV rays themselves cause yellowing. After production, finished PU steel wire hoses often need to be stored for a while. They should be kept in a dry, low-light area. Direct sunlight must be avoided.
Solutions:
Reduce oxygen levels in areas where PU steel wire hoses are produced and stored—you can fill these spaces with inert gas. Adding antioxidants and UV absorbers also works. These methods effectively delay yellowing. Of course, yellowing doesn’t harm the PU hose’s performance. It only affects how it looks.
Orientflex uses top-quality raw materials to make PU duct hoses. This pushes back the yellowing date significantly. What’s more, our hoses last much longer. If you need high-performance flexible hoses, contact us now.
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