Throughout the lifespan of the fiber optical cable（25 to 30 years）

it is inevitable to be in wet or water environments.However

moisture has an important impact on lifespan of fiber and fiber optical cable material.Therefore

the test results of water penetration is an important indicator of quality evaluation of fiber optical cable

also is an important aspect of the assessment of environmental performance

This paper described the impact of moisture on the fiber optical cable lifespan.Analyzed the causes of water penetration from product design

water blocking material select

process control and production environmental condition monitor.Introduced the location and cause of water penetration of stranded loose tube fiber optical cable.Analyzed the influence of producrion environmental conditions of fiber optical cable water penetration.Indicated the importance of environmental conditions for water penetration.