GB 5725-2025 Fall protection—Safety nets English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing thorugh draft translation, self-check, revision and varification) will be delivered upon being ordered.
1 Scope
This document specifies the classification, marking, technical requirements, identification, and information to be supplied by the manufacturer for safety nets. It also describes the corresponding test methods.
This document applies to safety nets used in industries such as construction, water conservancy, highways, electric power, shipbuilding, chemicals, mining, ports, and amusement places. These nets are intended to prevent the falling of persons or objects, restrict the range of personnel movement, and obstruct particulate matter and lines of sight during construction, equipment, and facility operation.
This document is not applicable to safety nets used for emergency rescue and firefighting operations.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute indispensable provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
· GB/T 5455-2014 Textiles - Burning behaviour - Determination of damaged length, smouldering and afterflame time for vertically oriented specimens
· GB/T 8834 Fibre ropes - Determination of certain physical and mechanical properties
· GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
· GB/T 12903-2008 Terminology for personal protective equipment
· GB/T 14522 Plastics, coatings, and rubber materials for mechanical industrial products - Methods for artificial weathering exposure to fluorescent UV lamps
· GB/T 14645 Textiles - Burning behaviour - Determination of damaged area and flame application times for 45° oriented specimens
· GB/T 21292 Fishing nets - Determination of breaking force of mesh
3 Terms and Definitions
For the purpose of this document, the terms and definitions given in GB/T 12903-2008 and the following apply.
3.1
safety nets
Nets used to prevent the falling of persons (or objects), mitigate fall injuries, restrict the movement trajectory of persons (or objects), or to obstruct dust and other particulate matter and lines of sight.
3.2
horizontal safety nets
Safety nets installed with their plane not perpendicular to the horizontal plane.
3.3
vertical safety nets
Safety nets installed with their plane perpendicular to the horizontal plane.
3.4
knot
A structure formed by the intertwining of net ropes, which, under tension, press against each other to fix the relative position of the ropes and the shape of the mesh.
3.5
round button with hole
A ring-shaped fastener made of metal or other hard material with a hole in the center, attached to the safety net.
3.6
border ropes
Ropes connected to the net body along its edges.
3.7
tie ropes
Ropes used to secure the safety net to the supporting structure.
3.8
tendon ropes
Ropes interlaced regularly within the net body to increase the strength of the safety net.
3.9
mesh
The basic geometric shape of the net body formed by knots or nodes.
3.10
mesh size
The distance between two adjacent knots or nodes of the net ropes on the safety net.
3.11
initial sag
The sag distance of a horizontally hung safety net due to its own weight.
3.12
pre-tension
The load applied to remove unnatural wrinkles from the test specimen before testing.
3.13
breaking stress
The maximum tensile force recorded when a net specimen is stretched to break.
Note: The unit for breaking stress is Newton (N) or kilonewton (kN).
3.14
extension at break
The elongation of the specimen when the breaking stress is reached.
Note: The unit for extension at break is millimeter (mm).
3.15
trapezoidal method tearing stress
The maximum tensile force recorded when a trapezoidal specimen tears under tension.
Note: The unit for trapezoidal method tearing stress is Newton (N).
4 Classification, Protection Levels, and Marking
4.1 Classification
4.1.1 Classification by Use Mode
Based on the mode of use, safety nets are classified into the following categories:
— Horizontal safety nets (P);
— Vertical safety nets (L).
4.1.2 Classification by Manufacturing Process
Based on the manufacturing process, safety nets are classified into the following categories:
— Braided safety nets (BZ);
— Warp-knitted safety nets from drawn monofilaments (JB);
— Impregnated/coated safety nets (JZ).
Note 1: Braided safety nets are formed using natural fibers (e.g., cotton, hemp) or synthetic fibers (e.g., nylon, polyvinyl alcohol, polyester, aramid) as raw materials, employing a multi-strand twisting rope-making process combined with manual or mechanical braiding techniques.
Note 2: Warp-knitted safety nets from drawn monofilaments use synthetic materials [e.g., HDPE, LLDPE, PP, PA] as raw materials. High-strength monofilaments are produced through processes like melt extrusion and drawing, then the net is formed through warping, knitting, cutting, sewing, and riveting.
Note 3: Impregnated/coated safety nets use synthetic fiber fabric (e.g., polyester, nylon, aramid) or metal wire mesh as a base material. Functional coatings such as resins, flame retardants, and anti-static agents are penetrated into the fiber matrix through an impregnation process, forming a dense coating after high-temperature curing. The net is then finished by cutting, sewing, and riveting.
4.2 Protection Levels
Based on the attachment method and protective function, safety nets are divided into the following protection levels:
— S I Grade Safety Nets: Installed horizontally. Used to form a cushioning barrier after a person or object falls, suspending them within the net body to prevent impact with the work platform or ground.
— S II Grade Safety Nets: Installed horizontally. Used to prevent the falling of persons or objects.
— C I Grade Safety Nets: Installed vertically. Used to restrict the work area of personnel or prevent objects from exceeding predefined limits, providing containment for hazardous area boundaries and object trajectories.
— C II Grade Safety Nets: Installed vertically. Used to obstruct dust and other particulate matter and lines of sight, providing functions of particulate barrier and visual shielding.
Note 1: S I grade safety nets are typically used in work scenarios involving falls from height, such as high-rise building construction, bridge construction protection, and industrial equipment maintenance platforms.
Note 2: S II grade safety nets are typically used in work scenarios with a risk of falling persons or objects, such as facade protection, pipe shafts, elevator shaft openings, and edges of elevated work platforms.
Note 3: C I grade safety nets are typically used for isolating hazardous work areas, amusement facility fencing, restricting unauthorized access, and preventing personnel or objects from exceeding safe operating limits.
Note 4: C II grade safety nets are typically used for dust control at construction sites, blasting areas in mines, containing hot metal dust, and preventing visual interference from strong light for operators.
4.3 Marking
4.3.1 Use Mode Marking
The use mode of safety nets is marked as follows:
— Horizontal safety nets are marked with the letter P.
— Vertical safety nets are marked with the letter L.
4.3.2 Manufacturing Process Marking
The manufacturing process of safety nets is marked as follows:
— Braided safety nets are marked with the letters BZ.
— Warp-knitted safety nets from drawn monofilaments are marked with the letters JB.
— Impregnated/coated safety nets are marked with the letters JZ.
Standard
GB 5725-2025 Fall protection—Safety nets (English Version)
GB 5725-2025 Fall protection—Safety nets English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing thorugh draft translation, self-check, revision and varification) will be delivered upon being ordered.
1 Scope
This document specifies the classification, marking, technical requirements, identification, and information to be supplied by the manufacturer for safety nets. It also describes the corresponding test methods.
This document applies to safety nets used in industries such as construction, water conservancy, highways, electric power, shipbuilding, chemicals, mining, ports, and amusement places. These nets are intended to prevent the falling of persons or objects, restrict the range of personnel movement, and obstruct particulate matter and lines of sight during construction, equipment, and facility operation.
This document is not applicable to safety nets used for emergency rescue and firefighting operations.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute indispensable provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
· GB/T 5455-2014 Textiles - Burning behaviour - Determination of damaged length, smouldering and afterflame time for vertically oriented specimens
· GB/T 8834 Fibre ropes - Determination of certain physical and mechanical properties
· GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
· GB/T 12903-2008 Terminology for personal protective equipment
· GB/T 14522 Plastics, coatings, and rubber materials for mechanical industrial products - Methods for artificial weathering exposure to fluorescent UV lamps
· GB/T 14645 Textiles - Burning behaviour - Determination of damaged area and flame application times for 45° oriented specimens
· GB/T 21292 Fishing nets - Determination of breaking force of mesh
3 Terms and Definitions
For the purpose of this document, the terms and definitions given in GB/T 12903-2008 and the following apply.
3.1
safety nets
Nets used to prevent the falling of persons (or objects), mitigate fall injuries, restrict the movement trajectory of persons (or objects), or to obstruct dust and other particulate matter and lines of sight.
3.2
horizontal safety nets
Safety nets installed with their plane not perpendicular to the horizontal plane.
3.3
vertical safety nets
Safety nets installed with their plane perpendicular to the horizontal plane.
3.4
knot
A structure formed by the intertwining of net ropes, which, under tension, press against each other to fix the relative position of the ropes and the shape of the mesh.
3.5
round button with hole
A ring-shaped fastener made of metal or other hard material with a hole in the center, attached to the safety net.
3.6
border ropes
Ropes connected to the net body along its edges.
3.7
tie ropes
Ropes used to secure the safety net to the supporting structure.
3.8
tendon ropes
Ropes interlaced regularly within the net body to increase the strength of the safety net.
3.9
mesh
The basic geometric shape of the net body formed by knots or nodes.
3.10
mesh size
The distance between two adjacent knots or nodes of the net ropes on the safety net.
3.11
initial sag
The sag distance of a horizontally hung safety net due to its own weight.
3.12
pre-tension
The load applied to remove unnatural wrinkles from the test specimen before testing.
3.13
breaking stress
The maximum tensile force recorded when a net specimen is stretched to break.
Note: The unit for breaking stress is Newton (N) or kilonewton (kN).
3.14
extension at break
The elongation of the specimen when the breaking stress is reached.
Note: The unit for extension at break is millimeter (mm).
3.15
trapezoidal method tearing stress
The maximum tensile force recorded when a trapezoidal specimen tears under tension.
Note: The unit for trapezoidal method tearing stress is Newton (N).
4 Classification, Protection Levels, and Marking
4.1 Classification
4.1.1 Classification by Use Mode
Based on the mode of use, safety nets are classified into the following categories:
— Horizontal safety nets (P);
— Vertical safety nets (L).
4.1.2 Classification by Manufacturing Process
Based on the manufacturing process, safety nets are classified into the following categories:
— Braided safety nets (BZ);
— Warp-knitted safety nets from drawn monofilaments (JB);
— Impregnated/coated safety nets (JZ).
Note 1: Braided safety nets are formed using natural fibers (e.g., cotton, hemp) or synthetic fibers (e.g., nylon, polyvinyl alcohol, polyester, aramid) as raw materials, employing a multi-strand twisting rope-making process combined with manual or mechanical braiding techniques.
Note 2: Warp-knitted safety nets from drawn monofilaments use synthetic materials [e.g., HDPE, LLDPE, PP, PA] as raw materials. High-strength monofilaments are produced through processes like melt extrusion and drawing, then the net is formed through warping, knitting, cutting, sewing, and riveting.
Note 3: Impregnated/coated safety nets use synthetic fiber fabric (e.g., polyester, nylon, aramid) or metal wire mesh as a base material. Functional coatings such as resins, flame retardants, and anti-static agents are penetrated into the fiber matrix through an impregnation process, forming a dense coating after high-temperature curing. The net is then finished by cutting, sewing, and riveting.
4.2 Protection Levels
Based on the attachment method and protective function, safety nets are divided into the following protection levels:
— S I Grade Safety Nets: Installed horizontally. Used to form a cushioning barrier after a person or object falls, suspending them within the net body to prevent impact with the work platform or ground.
— S II Grade Safety Nets: Installed horizontally. Used to prevent the falling of persons or objects.
— C I Grade Safety Nets: Installed vertically. Used to restrict the work area of personnel or prevent objects from exceeding predefined limits, providing containment for hazardous area boundaries and object trajectories.
— C II Grade Safety Nets: Installed vertically. Used to obstruct dust and other particulate matter and lines of sight, providing functions of particulate barrier and visual shielding.
Note 1: S I grade safety nets are typically used in work scenarios involving falls from height, such as high-rise building construction, bridge construction protection, and industrial equipment maintenance platforms.
Note 2: S II grade safety nets are typically used in work scenarios with a risk of falling persons or objects, such as facade protection, pipe shafts, elevator shaft openings, and edges of elevated work platforms.
Note 3: C I grade safety nets are typically used for isolating hazardous work areas, amusement facility fencing, restricting unauthorized access, and preventing personnel or objects from exceeding safe operating limits.
Note 4: C II grade safety nets are typically used for dust control at construction sites, blasting areas in mines, containing hot metal dust, and preventing visual interference from strong light for operators.
4.3 Marking
4.3.1 Use Mode Marking
The use mode of safety nets is marked as follows:
— Horizontal safety nets are marked with the letter P.
— Vertical safety nets are marked with the letter L.
4.3.2 Manufacturing Process Marking
The manufacturing process of safety nets is marked as follows:
— Braided safety nets are marked with the letters BZ.
— Warp-knitted safety nets from drawn monofilaments are marked with the letters JB.
— Impregnated/coated safety nets are marked with the letters JZ.
