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How to distinguish the quality of steel strip and aluminum strip in optical cable
2024-09-30
The steel strip and aluminum strip in the optical cable are mainly used to protect the optical fiber from mechanical side pressure, moisture-proof and other effects. The better optical cable generally uses chrome-plated steel strip. Low-quality optical cables replace chrome-plated steel strips with ordinary iron sheets or black sheets (uncoated steel strips) with only one side of anti-rust treatment. Over time, corrosion will occur in the optical cables and hydrogen loss of the optical fibers will increase. Moreover, due to their easy separation from the sheath, they cannot form a comprehensive adhesive sheath and their moisture-retaining performance is very poor. Some use tinned steel strips instead of chrome-plated steel strips, tinned steel strip surface, bubbles, etc. are inevitable.
Therefore, corrosion is prone to occur in humid atmosphere and surface condensation or immersion conditions, especially faster corrosion under acidic conditions. The tin-plated layer has poor heat resistance and the melting point is only 232 degrees Celsius. Due to the high temperature of the extruded sheath in the application, the peeling strength is uncertain, which affects the moisture resistance of the optical cable.
The melting point of chromium up to 1900 degrees Celsius, chemical properties are very stable, at room temperature in the air or immersed in water will not rust, corrosion resistance is very good, because the surface is easy to form a passivation layer so the environmental resistance is very good. Aluminum strip will generally appear to be unqualified hot paste method coated aluminum strip instead of casting method qualified coated aluminum strip, which will also affect the performance of optical cable.
