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After a period of use, silicone tubes will become hard and have no ductility. In more serious cases, they will crack. This is caused by the aging of silicone tubes. What are the reasons for the aging of silicone tubes?
The effect of ozone
The chemical oxygen radicals of oxygen are high and more destructive. It also causes the molecular chain to break. However, the effect of ozone on silicone tubes varies depending on whether the silicone tube is deformed. When the silicone tube that acts on the deformation is mainly unsaturated fatty rubber, cracks in the direction of stress will occur. That is, “ozone cracking”. When it acts on the deformed silicone tube, only the surface is converted into an oxide film without cracking.
The effect of moisture
Silicone tubes are easily damaged when exposed to humid air or soaked in water. This is because the water-soluble substances and water clusters in the silicone tube are extracted and dissolved by water. Hydrolysis or absorption and other reasons. Especially under the alternation of water immersion and air exposure, the damage of silicone tubes will be accelerated. But under certain conditions, moisture has no destructive effect on silicone tubes, and even has the effect of slowing down aging.
Oxidation
Oxygen in rubber produces a chain reaction through rubber molecules. The molecular chains are broken or excessively cross-linked, resulting in changes in rubber properties. Oxidation is one of the main reasons for rubber aging.
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