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GB 24429-2009 English PDF (GB24429-2009)

GB 24429-2009 English PDF (GB24429-2009)

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GB 24429-2009: Sports helmets -- Safety requirements and testing methods for sports helmets for cyclists and users of skateboards and roller skates

This standard specifies the terms and definitions, specifications, requirements, test methods, signs, packaging, transportation and storage, and product specifications for sports helmets for cyclists and users of skateboards and roller skates. This standard is mainly applicable to helmets for cyclists and users of skateboards and roller skates.
GB 24429-2009
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 97.220.40
Y 55
Sports helmets - Safety requirements and testing
methods for sports helmets for cyclists and users of
skateboards and roller skates
ISSUED ON: SEPTEMBER 30, 2009
IMPLEMENTED ON: JULY 01, 2010
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Specifications ... 7
5 Requirements ... 8
5.1 Structure ... 8
5.2 Performance ... 9
6 Test methods ... 10
6.1 Laboratory environmental conditions ... 10
6.2 Inspection of helmet structure, size, protection range, marking content ... 10 6.3 Inspection of helmet mass ... 10
6.4 Inspection of helmet vision ... 11
6.5 Test of stability of helmet retention system ... 13
6.6 Strength test of helmet retention system ... 14
6.7 Test of energy absorption of helmet ... 16
7 Marking, packaging, transportation, storage ... 20
7.1 Marking ... 20
7.2 Packaging, transportation, storage ... 21
8 Product manual ... 21
Sports helmets - Safety requirements and testing
methods for sports helmets for cyclists and users of
skateboards and roller skates
1 Scope
This standard specifies the terms and definitions, specifications, requirements, test methods, signs, packaging, transportation and storage, and product specifications for sports helmets for cyclists and users of skateboards and roller skates.
This standard is mainly applicable to helmets for cyclists and users of skateboards and roller skates.
2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 10000 Human dimensions of Chinese adults
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Sports helmet (hereinafter referred to as helmet)
A device used to absorb impact energy and reduce accidental injury to the wearer's head during exercise.
3.2
Shell
5 Requirements
5.1 Structure
The helmet is composed of a shell, a cushion coat, a comfort pad, a retention system, and the like.
5.1.1 Shell
It shall meet the following requirements:
a) Made of tough, water-resistant, heat-resistant and cold-resistant materials; b) The surface shall be firm and smooth; the edges shall be rounded to
prevent direct injury to the head;
c) During the test of this standard, the shell shall not rupture which will jeopardize the wearer
d) The height of the protrusion on the outer surface of the shell shall be not more than 7 mm (the easy-to-fall parts are not subject to this
requirements);
e) It may have ventilation holes.
5.1.2 Cushion coat
It shall meet the following requirements:
a) Made of materials that absorb more impact energy and are not subject to variability in sweat and cosmetics;
b) The adaptive cushion of appropriate shape and size to avoid displacement; c) The inner surface shall not have projections and sharp objects with a length greater than 2 mm;
d) It shall cover the minimum protection range of the head as specified in 3.9 and Figure 3;
e) It may have ventilation holes.
5.1.3 Comfort pad
It shall meet the following requirements:
a) Made of comfortable, sweat-absorbent, breathable, durable materials that 6 Test methods
6.1 Laboratory environmental conditions
The temperature is 20 ??C ?? 3 ??C; the relative humidity is 25% ~ 75%.
6.2 Inspection of helmet structure, size, protection range,
marking content
6.2.1 Inspection tools
The length measuring instruments which have a divisional value of not more than 0.5 mm as well as the large, medium, small, extra-small standard head model.
6.2.2 Inspection steps
a) Visually inspect the structure, appearance, marking of the helmet;
b) Use the measuring instrument to inspect the inner and outer surfaces of the helmet and the strap, etc.;
c) Measure the size and protection area of the helmet. Wear the helmet to the standard head model of the corresponding specification. It may adjust the adjustment device of the retention system and apply a 5 kg load on
the top of the helmet. Measure the protection area of the helmet. Mark the test area;
d) The results shall be in accordance with the provisions of Chapters 4, 5.1 and 7.1.
6.3 Inspection of helmet mass
6.3.1 Inspection tools
Weighing instruments which have a division value of not more than 5 g.
6.3.2 Inspection steps
a) Weigh and record the mass of the helmet (including accessories), in g; b) The results shall comply with the provisions of 5.2.1.
It consists of a single-axis accelerometer, amplifier, data processing, display and recording portion. Its main performance requirements are as follows: a) Frequency response range Hz ~ 1000 Hz, band cut-off point
dB, attenuation slope -9 dB/oct ~ -24 dB/oct;
b) Meet the acceleration value testing requirements set forth in 5.2.5; c) Measurement uncertainty U = 5% (k = 2).
6.7.2 Pre-test processing of helmet sample
The helmet samples must be processed in accordance with Table 4 before
testing. Choose one item for each helmet sample for processing.
The helmet samples after high temperature or low temperature treatment shall be tested within 3 minutes. If it exceeds 3 minutes, the helmet samples shall be returned to the incubator for more than 5 minutes before testing. The helmet samples after the water immersion shall be tested after being dried for 20 minutes.
Table 4 -- Pre-test processing conditions of helmet
Item Temperature / ??C Time / h
High temperature 50 ?? 3 4 ~ 24
Low temperature - 15 ?? 2 4 ~ 24
Water immersion 15 ~ 23 4 ~ 24
6.7.3 Test area and impact point
6.7.3.1 Test area
The test area is the portion above the ABCDEF line in Figure 3 (see Figure 3 and Table 1).
6.7.3.2 Impact point
Select any four weakest parts in the test area as the impact point. Make one impact for each impact point, wherein two impact points use flat anvil and the other two impact points use curbstone anvil (once for each along the length and width direction of the ventilation hole). The spacing between the two impact points is not less than 120 mm. The impact speed and the number of impacts are as shown in Table 5.

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