The box must have good corrosion resistance, aging resistance, and damage resistance.
The top surface of the box must be able to withstand a vertical pressure of no less than 500N. After the box door is opened, the outermost end of the door must be able to withstand a vertical pressure of no less than 100N. After unloading the load, the box must have no signs of damage or permanent deformation.
When optical cables are introduced, ordinary optical cables must be able to withstand an axial tensile force of not less than 500N after being fixed; After fixing the self-supporting butterfly optical cable, it must be able to withstand an axial tensile force of no less than 200N. After conducting tensile and torsional tests, check the fixing position of the optical cable and ensure that there is no looseness or damage to the cable.