1. the safety net can be made of nylon, vinylon, nylon or other weathering materials which are not less than the above varieties.

2. the height of the flat net shall not be less than 3m, the width of the vertical net shall not be less than 1.2m, and the mesh width of the mesh type safety net shall not be less than 1.2m. Product specification deviation: allowed less than 2%. The weight of each safety net should not exceed 15kg in general.

3. diamond mesh or square mesh safety net with a mesh length of not more than 8cm.

The connection between the 4. side rope and the net body must be firm. The breaking strength of the side rope of the flat net should not be less than 7000N; the breaking tension of the side line of the vertical net should not be less than 3000N.

5. the tether is evenly distributed along the side of the net, and the distance between the adjacent two tether should comply with the regulation of Table 1. The length is not less than 0.8m. When the tendon is strong and the tether is used together, the tether part must be lengthened and fastened with the length of the side, then it will be fastened back to the side rope to form a double root.

6. the distribution of tendons should be reasonable. The distance between two adjacent reinforcing bars on the flat net is not less than 30cm, and the breaking strength of the tendons is not greater than 3000N.

The fracture strength of the 7. nets should conform to the corresponding product standards.

8. all nodes of the safety net must be fixed.

9. carry out the test according to the safety net impact test mode.

10. the safety net of flame retardants must have flame retardancy, and its afterburning smouldering time should not exceed 4S.