GB 5725-2025Fall protection - Safety nets (English PDF)

4.1 Classification

4.1.1 Classification by usage Safety nets are divided into the following categories according to different usages. -- Horizontal safety nets; -- Vertical safety nets.

4.1.2 Classification by manufacturing process Safety nets are divided into the following categories according to different manufacturing processes. -- Twisted woven safety net; -- Brushed warp knitted safety net; -- Dip coated safety net. Note

1.Twisted woven safety nets are made of natural fibers (such as cotton and linen) or synthetic fibers (such as nylon, vinylon, polyester, aramid, etc.) as raw materials using a multi-strand twisted rope making process combined with manual or mechanical weaving technology. Note

2.Brushed warp knitted safety nets are made of synthetic materials [such as high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), polypropylene (PP), polyamide (PA), etc.] as raw materials. It is made into high-strength monofilament through processes such as melt extrusion and stretching, and then processed into shape through multiple processes such as weaving, cutting, sewing and riveting on a warp knitting machine. Note

3.Dip coated safety nets are made of synthetic fiber cloth (such as polyester, nylon, aramid) or metal wire mesh as the raw materials. Through an impregnation process, functional coatings such as resin, flame retardant, and antistatic agent are penetrated into the interior of the net body fibers. After high-temperature curing, a dense coating is formed. The nets are then processed and shaped through cutting, sewing, and riveting.

4.2 Protection level Safety nets are divided into the following protection levels according to the hanging method and protection function. -- Grade SI safety net. adopting horizontal hanging method to form a buffer barrier after the personnel or object falls, so that the personnel or object is suspended inside the net body to avoid collision with the work platform or the ground; -- Grade SII safety net. using horizontal hanging method to prevent THE personnel or object from falling; -- Grade CI safety net. adopting vertical hanging method to limit the working area of personnel or prevent object from exceeding the preset use range, with the function of restraining the boundaries of dangerous areas and the movement trajectory of objects. -- Grade CII safety net. adopting vertical hanging method to block dust and other particles and vision, with the function of blocking dust and other particles and visual shielding. Note

1.Grade SI safety nets are usually used in high-rise building construction, bridge construction protection, industrial equipment maintenance platform and other work scenarios where personnels or objects may fall from heights. Note

2.Grade SII safety nets are usually used in work scenarios where there is a risk of personnels or objects falling, such as facade protection, pipe shafts, elevator shafts, and edge protection of aerial work platforms. Note

3.Grade CI safety nets are usually used to isolate dangerous work areas, fence amusement facilities, restrict unauthorized entry, and prevent personnels or objects from exceeding the safe operating range. Note

4.Grade CII safety nets are usually used in work scenarios such as dust control in construction sites, mine blasting operations, blocking the spread of high- temperature metal dust, and preventing strong light from interfering with the operator's vision.

4.3 Marking

4.3.1 Marking of usage The usage of the safety nets is marked as. -- Horizontal safety nets are represented by the letter P; -- Vertical safety nets are represented by the letter L.

4.3.2 Marking of manufacturing process The manufacturing process of the safety nets is marked as. -- Twisted woven safety nets are represented by the letters BZ; -- Brushed warp knitted safety nets are represented by the letter JB; -- Dip coated safety nets are represented by the letters TF.

4.3.3 Marking method The marking of safety net products consists of four parts. usage, manufacturing process, product specifications and dimensions, and grade. Example

1.Flame retardant safety net, horizontal hanging, twisted woven, 3 m wide, 6 m long, for preventing personnels or objects from sustained falling, P-BZ-3×6 SI, flame retardant. Example

2.Non-flame retardant safety net, horizontal hanging, twisted woven, 4 m wide, 8 m long, for preventing personnels or objects from sustained falling, P-BZ-4×8 SI. Example

3.Safety net, horizontal hanging, twisted woven, 2 m wide, 2 m long, for preventing personnels or objects from falling, P-BZ-2×2 SII. Example

4.Safety net, vertical hanging, dip coated, 2 m wide and 6 m long, for preventing personnels or objects from exceeding a preset range, L-TF-2×6 CI. Example

5.Safety net, vertical hanging, brushed warp knitted,

1.8 m wide, 6 m long, for preventing particulate matter and vision, L-JB-1.8×6 CII.

Note. Twisted woven safety nets are divided into flame retardant and non-flame retardant types. Flame retardant products have the word "flame retardant" clearly indicated in the classification mark. Brushed warp knitted and dip coated safety nets are all flame retardant products, so the word "flame retardant" is no longer marked.

5.1.1 Twisted woven safety net

5.1.1.1 The rope ends shall be braided, scorched, etc. and shall not come undone.

5.1.1.2 All nodes on the net body shall be fixed.

5.1.1.3 The mesh size shall not be greater than 8 cm.

5.1.1.4 If there are tie ropes, they shall be firmly connected to the net body and shall be evenly distributed along the edge of the net body. The distance between two adjacent tie ropes shall not be greater than 75 cm, and the length of the tie ropes shall not be less than 80 cm.

5.1.1.5 If there are tendon ropes, the distance between two adjacent tendon ropes shall not be less than 30 cm.

5.1.1.6 When the tendon rope and the tie rope are integrated, the tie rope part shall be lengthened and, after being fastened with the border rope, folded back and fastened with the border rope to form at least two ropes.

5.1.1.7 The allowable deviation between the length and width of the net body and the corresponding directions of its nominal specifications shall be ±4%.

5.1.2 Brushed warp knitted safety net

5.1.2.1 There shall be no skipped stitches or missed seams, and the seam edges shall be even.

5.1.2.2 There shall be no yarn breakage, holes, deformation or other warp knitting defects that would hinder use.

5.1.2.3 The round button with hole on each edge shall be firm and reliable.

5.1.2.4 The width shall not be less than

1.0 m, with an allowable deviation of ±4%.

5.1.2.5 The round button with hole shall not be less than 8 mm.

5.1.2.6 The mesh shall not be larger than phi2 mm.

5.1.3 Dip coated safety net

5.1.3.1 There shall be no skipped stitches or missed seams, and the seam edges shall be even.

5.1.3.2 The surface coating shall evenly cover the net body fibers without any missing coating, sagging, orange peel or local accumulation.

5.1.3.3 The round button with hole on each edge shall be firm and reliable.

5.1.3.4 The width shall not be less than

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