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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 2811-2007 Safety helmet. The following main technical changes have been made with respect to GB 2811-2007:
—— application scope of this standard is modified (see Clause 1);
—— wording of some terms and definitions is modified and some terms are deleted (see Clause 3; Clause 3 in 2007 Edition);
—— classification of safety helmets is added (see Clause 4);
—— requirements for the quality of safety helmets are modified (see Sub-clause 5.2.6; Sub-clause 4.1.7 in 2007 Edition);
—— requirements for wearing height are modified (see Sub-clause 5.2.9; Sub-clause 4.1.11 in 2007 Edition);
—— requirements for vent hole are modified (see Sub-clause 5.2.13; Sub-clause 4.1.15 in 2007 Edition);
—— requirements for low-temperature resistance are modified (see Sub-clause 5.3.3; Sub-clause 4.3.5 in 2007 Edition);
—— requirements for ultra-high-temperature resistance are modified (see Sub-clause 5.3.4 are added (see Sub-clause 5.3.4);
—— requirements for electrical insulation property are modified (see Sub-clause 5.3.5; Sub-clause 4.3.2 in 2007 Edition);
—— requirements for anti-static property are modified (see Sub-clause 5.3.6; Sub-clause 4.3.1 in 2007 Edition);
—— requirements for resistance to small splashes of molten metal (see Sub-clause 5.3.7);
—— requirements for permanent identification of safety helmets are modified (see Sub-clause 7.2; Sub-clause 6.1 in 2007 Edition);
This standard was proposed by and is under the jurisdiction of the Ministry of Emergency Management of the People's Republic of China.
The previous editions of this standard are as follows:
—— GB 2811-1989 and GB 2811-2007.
Head protection - Safety helmets
1 Scope
This standard specifies the classification, marking, technical requirements, inspection and identification of safety helmets.
This standard is applicable to safety helmets used for head protection in workplaces.
This standard is inapplicable to head protection articles for firefighting, emergency rescue, sports and vehicles.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 2812 Test method of safety helmet
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
safety helmets
helmets that protect users' heads from injuries caused by other specific factors such as falling objects or small splash objects
Note: They are generally composed of shell, harness and accessories.
3.2
shell
the outer shell of a safety helmet
Note: It is generally composed of shell, visor, brim and top reinforcement.
3.3
top reinforcement
structure for increasing the strength of the top of the shell
3.4
harness
the general term for the internal components of safety helmet
Note: It is generally composed of headband, sweatband, liner strip, cushion, etc.
3.5
headband
an adjustable band that serves for fixation around the head
3.6
sweatband
sweat-absorbent material attached to headband
3.7
liner strip
liner tape in direct contact with the user's head
3.8
chin strap
an adjustable fitting attached to the chin to aid fixation
3.9
horizontal distance
the radial distance on the horizontal plane between the headband and the inside of the shell when the safety helmet is worn
3.10
vertical distance
the axial distance between the highest point of the head and the inner surface of the shell (excluding the space of the top reinforcement) when the safety helmet is worn
3.11
wearing height
the axial distance from the lowest point on the side bottom of the headband to the highest point on the top of the head when the safety helmet is worn
4 Classification and marking
4.1 Classification
4.1.1 Safety helmets are classified into ordinary type (P) and special type (T) according to their properties. Ordinary type safety helmet is a safety helmet product with basic protective properties and suitable for general workplaces while special safety helmet is a safety helmet product with one or more special properties in addition to basic protective properties and suitable for special workplaces corresponding to its properties.
4.1.2 Special type safety helmets with electrical insulation properties are classified into Grades G and E according to the withstand voltage. Electrical insulation test voltage for Grades G and E are 2,200 V and 20,000 V respectively.
4.2 Classification mark
4.2.1 The classification mark of safety helmet consists of product name and property mark.
4.2.2 See Table 1 for the classification marks of safety helmets, and select the corresponding properties from top to bottom in the table to mark.
Table 1 Classification marks of safety helmets
Product category Symbol Special property classification Property marks Remarks
Ordinary type P — — —
Special type T Flame retardant Z —
Lateral rigidity LD —
Low-temperature resistance -30℃ —
Ultra-high-temperature resistance +150℃ —
Electrical insulation J G Test voltage: 2,200V
E Test voltage: 20,000V
Anti-static property A —
Resistance to small splashes of molten metal MM —
Example 1: Ordinary type safety helmet is marked as safety helmet (P);
Example 2: Safety helmet with lateral rigidity and low-temperature resistance is marked as safety helmet (T LD-30℃);
Example 3: Safety helmet with lateral rigidity, ultra-high-temperature resistance and electrical insulation properties and with test voltage of 20,000V is marked as safety helmet (T LD+150℃JE);
5 Technical requirements
5.1 General requirements
5.1.1 No toxic, harmful or skin allergy-causing materials shall be used.
5.1.2 Recycled and reclaimed materials shall not be used as raw materials for the stressed components of safety helmet (e.g. shell, liner strip, headband, etc.).
5.1.3 The aging resistance of materials shall not be lower than the service life indicated in the product identification. The normally used safety helmet shall not fail in its protection function due to material reasons during the service life.
5.2 Requirements for basic properties
5.2.1 Headband
Headband shall be adjustable according to the applicable head circumference indicated in the safety helmet identification.
5.2.2 Sweatband
The area of the headband corresponding to the forehead shall be provided with sweat absorbent fabric or added with sweatband, and the width of the shall not be less than the width of the headband.
5.2.3 Dimension of chin strap
If a safety helmet is equipped with chin strap, webbing with a width of not less than 10 mm or rope with a diameter of not less than 5 mm shall be used.
5.2.4 Shell
The surface of the shell shall be free from bubbles, defects and other defects detrimental to properties.
5.2.5 Component installation
The components of safety helmets shall be installed firmly without loosening or slipping.
5.2.6 Quality (excluding accessories)
The weight of special type safety helmet shall not exceed 600g; that of the ordinary type safety helmet shall not exceed 430g; the relative error between the actual product mass and the marked mass shall not be greater than 5%.
5.2.7 Visor
Determined according to the methods in GB/T 2812, the length of visor shall be no greater than 70mm.
5.2.8 Brim
Determined according to the methods in GB/T 2812, the length of brim shall be no greater than 70mm.
5.2.9 Wearing height
Measured according to the methods in GB/T 2812, the wearing height shall be no less than 80mm.
5.2.10 Vertical distance
Measured according to the methods in GB/T 2812, the vertical distance shall be no greater than 50mm.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and marking
5 Technical requirements
6 Inspection
7 Identification
Annex A (Normative) Test on resistance to ultra-high temperature
Annex B (Normative) Test on resistance to small splashes of molten metal
Bibliography
