GB 811-2022_English: PDF (GB811-2022)
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Helmets for motorcycle and electric bicycle users
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Helmets for motorcyclists
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| Standard ID | GB 811-2022 (GB811-2022) | | Description (Translated English) | Helmets for motorcycle and electric bicycle users | | Sector / Industry | National Standard | | Classification of Chinese Standard | C73 | | Classification of International Standard | 13.340.20 | | Word Count Estimation | 42,424 | | Date of Issue | 2022-12-01 | | Date of Implementation | 2023-07-01 | | Older Standard (superseded by this standard) | GB 811-2010 | | Administrative Organization | Ministry of Public Security of the People's Republic of China, Ministry of Industry and Information Technology of the People's Republic of China | | Proposing organization | Ministry of Public Security of the People's Republic of China, Ministry of Industry and Information Technology of the People's Republic of China | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Management Committee | | Standard ID | GB 811-2010 (GB811-2010) | | Description (Translated English) | Helmets for motorcyclists | | Sector / Industry | National Standard | | Classification of Chinese Standard | C73 | | Classification of International Standard | 13.340.20 | | Word Count Estimation | 21,292 | | Date of Issue | 2010-11-10 | | Date of Implementation | 2011-05-01 | | Older Standard (superseded by this standard) | GB 811-1998 | | Adopted Standard | ECE 22-2002, reference; JIS T8133-1994, reference; CNS 3902-1992, reference; | | Drafting Organization | Ministry of Public Security Traffic Management Research Institute | | Administrative Organization | Ministry of Public Security | | Regulation (derived from) | Announcement of Newly Approved National Standards 2010 No. 8 (No. 163 overall) | | Proposing organization | People's Republic of China Ministry of Public Security | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This Chinese standard specifies the basic structure motorcycle helmet crew, types and specifications, technical requirements, test methods, inspection rules and labels, this standard applies to motorcycle occupants (including the driver and the passenger) wear a helmet. | | Standard ID | GB 811-1998 (GB811-1998) | | Description (Translated English) | Helmets for motorcycle users | | Sector / Industry | National Standard | | Classification of Chinese Standard | C13 | | Classification of International Standard | 13.340.10 | | Word Count Estimation | 12,184 | | Date of Issue | 1998/7/2 | | Date of Implementation | 1999/6/1 | | Older Standard (superseded by this standard) | GB 811-1989 | | Quoted Standard | GB 10000-1988 | | Regulation (derived from) | Announcement of Newly Approved National Standards 2010 No. 8 (No. 163 overall) | | Proposing organization | Ministry of Public Security of the People Republic of China | | Issuing agency(ies) | State Quality and Technical Supervision | | Summary | This Standard specifies the basic structure of motorcycle helmets, types and specifications, technical requirements, test methods and inspection rules; This Standard is applicable to motorcycle riders to wear a helmet and ride; |
GB 811-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.340.20
CCS C 73
Replacing GB 811-2010
Helmets for Motorcycle and Electric Bicycle Users
ISSUED ON: DECEMBER 1, 2022
IMPLEMENTED ON: JULY 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Product Classification ... 8
5 Requirements ... 10
6 Test Methods ... 18
7 Inspection Rules ... 39
8 Marking, Identification, Product Instruction Manual, Packaging, Transportation and
Storage ... 40
9 Requirements for Implementation Transition Period ... 42
Appendix A (normative) Shape and Size of Testing Headform above the Reference
Plane ... 43
Appendix B (normative) Shape and Size of Testing Headform below the Reference
Plane ... 49
Appendix C (normative) Requirements and Test Methods for Helmet Type
Identification ... 56
Bibliography ... 59
Helmets for Motorcycle and Electric Bicycle Users
1 Scope
This document specifies the product classification, requirements, inspection rules and marking,
identification, product instruction manual, packaging, transportation and storage of helmets for
motorcycle and electric bicycle users, and describes the test methods.
This document is applicable to the helmets worn by drivers and passengers of motorcycles and
electric bicycles.
This document does not apply to the helmets worn by bikers, skateboarders and roller skating
athletes, nor does it apply to occupational safety helmets.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in this text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 2410-2008 Determination of the Luminous Transmittance and Haze of Transparent
Plastics
GB/T 18833 Retroreflective Sheeting for Traffic Control
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Helmet for Motorcycle and Electric Bicycle Users
Helmet for motorcycle and electric bicycle users refers to a device of reducing head injuries of
motorcycle and electric bicycle occupants in accidents.
3.2 Shell
Shell refers to the outer structure of the helmet for motorcycle and electric bicycle users, which
presents the basic shape of the helmet.
3.3 Protective Padding
Protective padding refers to a form-fitting padding that absorbs collision energy.
3.4 Comfort Padding
Comfort padding refers to a padding that guarantees comfortable fit on the head.
3.5 Retention System
Retention system refers to a component that ensures the helmet for motorcycle and electric
bicycle users is securely worn on the head.
3.6 Goggles
Goggles refers to a component for eye and face protection that covers the eyes and face without
affecting the observation.
3.7 Luminous Transmittance
Luminous transmittance refers to the ratio of the luminous flux of visible light through the
goggles to the incident luminous flux.
3.8 Haze
Haze refers to the ratio of the scattered luminous flux that deviates from the direction of the
incident light through the goggles to the transmitted luminous flux.
NOTE: it is expressed as a percentage, and only the scattered luminous flux deviated from the
incident light direction by more than 2.5 is used for the calculation of the haze.
[source: GB/T 2410-2008, 3.1, modified]
3.9 Testing Headform
Testing headform refers to a head model that simulates the geometric shape and mechanical
properties of human head during the inspection of the helmet for motorcycle and electric bicycle
users.
3.10 Basic Plane
Basic plane refers to a plane passing through the centers of the left and right external ear holes
and the infraorbital rim of the testing headform.
NOTE: see O-O plane in Figure 1.
x---the vertical distance from the basic plane to the reference plane;
y---the vertical distance from the reference plane to the top of the testing headform.
A-A is the lower edge plane of the protect section of Type A3 and Type B3 helmets, and also an auxiliary
plane for other types of helmets to set the protect section.
Figure 2 -- Reference Plane
3.12 Vertical Median Plane
Vertical median plane refers to a longitudinal plane passing through the apex of the testing
headform, perpendicular to the basic plane and dividing the testing headform into two
symmetrical parts.
3.13 Protect Section
Protect section refers to the range of head protected by the helmet for motorcycle and electric
bicycle users.
3.14 Testing Section
Testing section refers to an inspection area for the collision energy absorption performance and
penetration resistance performance of the helmet for motorcycle and electric bicycle users.
4 Product Classification
4.1 Type
4.1.1 In accordance with the applicable objects, the helmets for motorcycle and electric bicycle
users (hereinafter referred to as “helmets”) are divided into Type A and Type B. Type A is
helmets for motorcycle riders, which is applicable to motorcycle riders and electric bicycle
riders; Type B is helmets for electric bicycle riders, which is merely applicable to electric
bicycle riders.
4.1.2 In accordance with the shape, the helmets are divided into Shape 1, Shape 2 and Shape 3.
Shape 1 is full-helmet, Shape 2 is 3/4 half-helmet, and Shape 3 is 1/2 half-helmet, as it is shown
in Figure 3. The type, shape and applicable objects of the helmets shall comply with the
stipulations of Table 1.
5.1.2.2 The outer surface shall be a streamlined curved surface design and comply with the
following requirements:
a) The surface shall be solid and smooth, with blunt edges;
b) In addition to the device for fixing the goggles, when there is a hard attached
protrusion exceeding 5 mm, it shall pass the shear force test of the surface convex
structure;
c) The helmet rivets shall be radial, and the protruding part shall not exceed 2 mm from
the outer surface of the helmet;
d) The outer surface shall have reflective materials with a total area of not less than 3,200
mm2 and a retro-reflection coefficient of not less than 70 cd/(lx m2), which are
visible in the left, right and rear directions, and the vertical projected area of the
reflective materials visible in each direction shall be not less than 640 mm2.
5.1.2.3 The inner surface shall comply with the following requirements:
a) There shall be no sharp objects with a length exceeding 2 mm and a radius less than
1 mm;
b) When there are protrusions with a height exceeding 2 mm, the protrusions shall be
covered with a protective padding;
c) There shall be no sharp edges.
5.1.3 Protective padding
The protective padding shall use materials with buffer performance, collision energy absorption
performance, and non-toxic and harmless to the human body, and comply with the following
requirements:
a) The shape, specifications and size shall be suitable for the head circumference, and
not easy to shift after wearing;
b) The testing section specified in 5.2.1 shall be covered.
5.1.4 Comfort padding
The comfort padding shall use durable materials that feel comfortable, breathable, non-toxic
and harmless to the skin, and comply with the following requirements:
a) The wearing comfort of the helmet shall be ensured;
b) For those configured with an adjustment device to adapt to the size of the head
circumference, adopt the maximum adjustable head circumference size to determine
the specifications of the helmet.
5.1.5 Retention system
The parts of the retention system shall be permanently attached to the retention system or the
helmet, and comply with the following requirements:
a) If the retention system includes a chin strap, the width of the strap shall be not less
than 20 mm;
b) If the retention system has fastening devices, such as: double D rings and sliding rods,
when adjusting the retention system, a sufficient adjustment margin shall be reserved;
c) If quick-release devices, for example, wearing buckles, are used, the method of
opening shall be simple and easy, and shall be able to prevent possible mis-operations.
The push rod, button or other parts used for the opening mechanism shall be red or
orange, and can only be opened when consciously operated;
d) If the locking device of the fixing strap is designed to be opened through the mode of
applying pressure to a certain part, then, when tested in accordance with the method
of 6.2.2, the locking device cannot be opened;
e) After all the locking devices are tested in accordance with 6.10, without using any
tools, they shall be opened within 30 s.
5.1.6 Goggles
The goggles shall be made of materials that comply with the light transmission performance
and impact strength performance, and satisfy the following requirements:
a) Open the lens to the highest position, in accordance with Figure 4, the angle between
the MN line at the opening position of the goggles and the horizontal line shall be not
less than 5;
b) During the opening and closing of the goggles, the positioning function under the
action of non-artificial external force can be maintained.
penetrate the helmet and come into contact with the testing headform.
6 Test Methods
6.1 Environmental Conditions of the Laboratory
Temperature: 21 C 5 C; relative humidity: 40% ~ 80%.
6.2 Specifications, Structure and Test of Protect Section
6.2.1 Test tools
Length measuring instrument with an accuracy of not greater than 0.1 mm and a measuring
range of 0 mm ~ 150 mm; angle measuring instrument with an accuracy of not greater than 0.1
and a measuring range of 0 ~ 180; spirit level and the testing headform specified in Table 2.
6.2.2 Test procedures
Visually inspect the appearance and structural composition of the helmet.
Use the length measuring instrument to detect the protrusions on the inner and outer surfaces
of the shell.
Take the reflective material with the same texture as that applied on the surface of the shell,
through the mode of collage or cutting, make 3 specimens with a size of not less than 50 mm
50 mm. In accordance with the method of GB/T 18833, under the conditions of an observation
angle of 0.2 and an incident angle of 4, test its retro-reflection coefficient; take the arithmetic
mean of 3 test results as the final test result. In accordance with the vertical projection diagram
of the reflective material in the left, right and rear directions of the helmet provided by the
manufacturer, measure and calculate the vertical projected area of the reflective material in each
direction.
Under the condition that 150 N 5 N tension is applied to tighten the strap, use a length
measuring instrument to measure the width of the chin strap.
For the strap locking device that is opened by pressing, use a hard ball with a diameter of 100
mm 5 mm and a force of 100 N 5 N to press the part, check whether the locking device can
be opened. If due to the structural limitations of the retention system, the hard ball cannot touch
the pressing part of the buckle, it shall be deemed as cannot be opened.
Use the angle measuring instrument to detect the highest open position of the lens.
Put the helmet on the testing headform of the corresponding specification, add a 5 kg 0.2 kg
sandbag on the top of the helmet, adjust the helmet, so that the symmetrical plane of the helmet
is consistent with the symmetrical plane of the testing headform, and the forehead edge satisfies
the requirements of the upper field of view; measure the protect section of the helmet, mark the
testing section, and check the shape, size and specification.
6.6 Shear Force Test of Surface Convex Structure
6.6.1 Test equipment
6.6.1.1 Equipment composition
The equipment is composed of carrier, horizontal guiding device, pulley, drop hammer,
headform support, lever structure with a hinge, and loading device, etc., as it is shown in Figure
11.
6.6.1.2 Carrier
The carrier is installed on the horizontal guiding device, with fixtures for replaceable mounting
cutters and sandpapers.
During the shear force test, a steel cutter with a height of 6 mm and a width of 25 mm is fixedly
installed on the carrier. The edge chamfering radius of the cutter is 1 mm 0.1 mm, and the
surface of the cutter is carburized and hardened with a depth of 0.5 mm.
During the friction force test, a piece of Grade 80 aluminum oxide-coated sandpaper with a
length of 3003.00 mm is fixed on the carrier. There is a smooth area with a length of 80 mm
1 mm not covered with the sandpaper on the surface of the carrier near the end of the drop
hammer in front of the sandpaper, and the surface of this area is 0.5 mm 0.1 mm higher than
the surface of the carrier covered with the sandpaper.
The total mass of the carrier and its attachments is 5.0 0െ0.2 kg.
6.6.1.3 Horizontal guiding device
The horizontal guiding device, which is used to guide and support the loading platform, is
composed of two parallel guide rails. The carrier can freely slide on the guide rails.
6.6.1.4 Pulley with wire rope or belt
The radius of the pulley is at least 60 mm, and its function is to convert the wire rope or belt
from the horizontal direction to the vertical direction. The horizontal end of the wire rope or
belt is fixed on the carrier, and the vertical end is fixed on the drop hammer.
6.6.1.5 Drop hammer
The mass of the drop hammer is 150.50 kg, the height of free drop is 5000.50 mm, and there is
a margin of at least 400 mm stroke.
6.6.1.6 Support of testing headform
The position and angle of the testing headform can be adjusted, so that any point on the outer
surface of the helmet can be in contact with the upper surface of the carrier, and a force can be
6---hinged lever structure;
7---pulley;
8---wire rope or belt;
9---release device;
10---drop hammer.
Figure 11 -- Shear Force and Surface Friction Force Test Equipment of Surface Convex
Structure of Helmet
6.6.2 Test procedures
6.6.2.1 Helmet installation
After putting the helmet on the corresponding testing headform in accordance with the method
of 6.2.2, adjust the helmet backward, so that the front edge of the helmet moves 25 mm on the
symmetrical plane; if the helmet has an adjustable strap, tighten the strap as much as possible.
Adjust the testing headform support, so that the selected test point on the helmet is in contact
with the upper surface of the horizontal carrier.
For the helmets equipped with accessories, the test shall be carried out with and without
accessories installed. The helmets equipped with goggles shall be tested with the goggles in a
closed state.
6.6.2.2 Selection of test point
All convex structures on the outer surface of the shell that exceed the height of the outer surface
by more than 5 mm, except for the device for fixing the goggles, shall be tested.
Each test point shall be tested once.
NOTE: in this test, helmet rims and the top and bottom edges of the goggles are not considered as
convex structures.
6.6.2.3 Shear force test
On the carrier, install a cutter. Adjust the position of the helmet, so that the selected convex
structure is located 50 mm in front of the edge of the cutter on the carrier. After applying a force
of 40010.00 N, release the drop hammer from a height of 5000.50 mm, check the shearing of the
convex structure by the cutter edge.
6.7 Surface Friction Force Test
6.7.1 Test equipment
Same as 6.6.1.
6.7.2 Test procedures
6.7.2.1 Helmet installation
Same as 6.6.2.1.
6.7.2.2 Selection of test point
Select an area on the outer surface of the helmet that is relatively rough and has a high frictional
resistance.
Each test point shall be tested once.
6.7.2.3 Friction force test
Install a sandpaper on the carrier. Adjust the position of the helmet, so that the selected test
point is in contact with the carrier. The contact point is located at the center of the smooth area
of the carrier in front of the sandpaper. After applying a force of 40010.00 N perpendicular to the surface of the carrier to the helmet, release the drop hammer from a height of 5000.50 mm
and check the sliding of the carrier. After each test, the sandpaper shall be replaced.
6.8 Rigidity Performance Test
6.8.1 Place the helmet between two parallel plates and apply the load on the longitudinal axis
(L-L in Figure 12) or the transverse axis (T-T in Figure 12). The initial load is 30 N, after
maintaining for 2 min, measure the distance between the two parallel plates. Then, at a moving
speed of not less than 20 mm/min, increase the load by 100 N, wait for 2 min. Repeat this
process, until the applied load is 630 N. After maintaining for 2 min, measure the distance
between the two parallel plates. Finally, at a moving speed of not less than 20 mm/min, reduce
the load acting on the two parallel plates to 30 N, and measure the distance between the two
parallel plates.
6.8.2 When the longitudinal axis and transverse axis are tested, two different helmets shall be
used.
Figure 12 -- Rigidity Test
Each helmet shall be accompanied by a product instruction manual in Chinese, which shall at
least explain the following contents:
a) Remind the buyers to choose a qualified helmet that fits their own head size;
b) During use, the strap must be fastened;
c) Description of the applicable conditions of use for the helmet (such as: Type B
helmets are limited to electric bicycle users, and children under the age of 12 should
choose light-weight helmets, etc.);
d) Stop using the helmet if there is a major collision accident;
e) Properly store it and do not use corrosive solvents to scrub the outer surface of the
helmet;
f) Recommend the service life.
8.3 Packaging, Transportation and Storage
8.3.1 The content of marking specified in 8.1.1 shall be displayed on the product packaging
box.
8.3.2 The product packaging box shall indicate the requirements of preventing collisions, direct
exposure to sunlight, moisture and corrosion of organic chemicals during transportation and
storage.
9 Requirements for Implementation Transition Period
For Type A helmets produced or imported before the date of implementation of this document,
the requirements of this document shall be satisfied from the 7th month since the date of
implementation of this document.
......
GB 811-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.340.20
C 73
Replacing GB 811-1998
Helmets for motorcyclists
ISSUED ON. NOVEMBER 10, 2010
IMPLEMENTED ON. MAY 1, 2011
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Terms and definitions ... 5
3 Categories, shapes and specifications ... 7
4 Requirements ... 9
5 Test methods ... 14
6 Inspection rules ... 26
7 Marks ... 28
References ... 30
Foreword
4.1.2 (except item d), 4.1.5, 4.1.6, 4.2 of Clause 4 and 7.1 of Clause 7 in this
Standard are mandatory, and the rest are recommendatory.
Class-A helmet’s indicators such as stiffness performance and stability of
helmet fixture refer to ECE 22-2002 “Motorcycle protective helmets”; Class-B
helmet’s indicator collision energy absorption refer to Japanese standard - JIS
T8133-1994 “Protective helmets for motorcycle and moped riders and
passengers” and Chinese Taiwan standard CNS 3902-92 “Riding motorcycle
helmets”.
This Standard replaces GB 811-1998 “Helmets for motorcyclists”.
Main changes between this Standard and GB 811-1998 are as follows.
- Added and modified some of the terms and definitions (Clause 2 of this
Edition);
- Classified helmets by helmet performance (Clause 3 of this Edition);
- Added the requirements for helmet stiffness performance, requirements for
helmet fixture stability; modified helmet projection, wearing device, goggle,
protection area, vision, collision energy absorption, and penetrating
performance (Clause 4 of this Edition);
- Specified test requirements for added items (Clause 5 of this Edition);
- Rewrote the inspection rules, and specified exit-factory inspection and type
inspection (Clause 7 of 1998 Edition and Clause 6 of this Edition);
- Added marks of helmet classification (Clause 7 of this Edition).
This Standard was proposed by The Ministry of Public Security of the People’s
Republic of China.
The drafting organizations of this Standard. National Road Traffic Safety
Product Quality Supervision and Inspection Center, Hebei Provincial Product
Quality Supervision and Inspection Institute AND Shanghai Hehui Safety
Products Manufacture Co., Ltd.
Main drafters of this Standard. Yu Chunjun, Qin Dongwei, Yang Youtao, Zheng
Genchao and Xu Xiangrong.
This Standard replaces the following previous standards.
- GB 811-1989, GB 811-1998.
Helmets for motorcyclists
1 Scope
This Standard specifies the basic structure, categories and specifications,
technical requirements, test methods, inspection rules and marks of helmets for
motorcyclists (hereinafter referred to as the “Helmets”).
This Standard is applicable to the helmets for motorcyclists (including riders
and passengers).
2 Terms and definitions
The following terms and definitions apply to this Standard.
2.1 Helmet
Device that is to reduce motorcyclist’s head injuries in a motorcycle accident.
2.2 Shell
Helmet’s outer layer structure, presenting the basic shape of the helmet.
2.3 Protective padding
Aptamer cushion that is to absorb impact energy.
2.4 Comfort padding
Padding that is to ensure comfort of wearing on the head.
2.5 Retention system
The part that is to ensure helmet firmly worn on the head.
2.6 Goggles
Eyes and face protection part that is to shelter the eyes and face without
affecting observation.
2.7 Luminous transmittance
The ratio of luminous flux of visible light through goggles and incident flux.
- There shall be no external projection of which the length is 5 mm on the
outer surface of helmet. However, parts that are easy to fall off shall not
be included, not including the following ones. device of fixed glasses
and device of fixed lens.
Note. The parts, which are easy to fall off refer to those parts that are easy to fall off
when they are impacted, not including the parts that are easy to be dismounted by
screwdrivers.
4.1.3 Protective padding
Protective padding shall meet the following technical requirements.
a) Use material that has cushioning performance, is able to absorb more
collision energy, and is non-toxic and harmless to human body;
b) The shape and specifications are body-fitted; shall not shift during wearing;
c) It shall cover testing area with even thickness.
4.1.4 Comfort padding
Comfort padding shall meet the following technical requirements.
a) Use durable material that feels comfortable, is absorbent, breathable, non-
toxic to the skin and harmless;
b) It shall ensure the comfort of helmet wearing.
4.1.5 Retention system
Parts of retention system shall be permanently connected to retention system
or helmet, and comply with the following technical requirements.
a) If retention system contains chin strap of which the width shall not be less
than 20 mm;
b) If retention system has fastening device, e.g., double D ring and sliding
stick, it shall remain enough allowance for adjustment during retention
system adjustment, so as to prevent strap loosing;
c) Quick release device like retention button shall be easy to open.
Meanwhile, it must prevent possible false operation. Putter, button or other
components used for opening mechanism shall be red or orange, and
shall be opened only during conscious operation. If retention system is
designed to open by applying pressure on some parts, retention buttons
Note. a refers to horizontal distance from central axis of headform to front part direction of
headform; b refers to horizontal distance from central axis of headform to back part
direction of headform; AC refers to horizontal distance from headform front part
backward on AA plane; HD refers to horizontal distance from headform back part
forward.
4.2.2 Helmet mass (including accessories)
Examine according to the methods specified in 5.3. Class-A shall not be greater
than 1.6 kg; Class-B shall not be greater than 1.0 kg.
4.2.3 Visual field of helmet
Conduct the test according to the method specified in 5.4. Left and right
horizontal visual field is not less than 105°, the upper-visual field is not less than
7° and the lower-visual field is not less than 45°.
4.2.4 Helmet goggles
Conduct the test according to the method specified in 5.5.1. If goggles were
broken, there must be no fragments that are less than 60°.
Conduct the test according to the method specified in 5.5.2. Visible light
transmittance of goggles is not less than 85%.
4.2.5 Stiffness (this test is only applicable to Class-A helmet)
Conduct the test according to the method specified in 5.6 and the following
requirements.
a) Under 630N force, the difference between deformation along with testing
axis and deformation of 30N, the initial load, is not greater than 40 mm;
b) When gradually unloading and recovering to 30N, the initial load, the
difference between the measured deformation and deformation of 30N,
the initial load, it not greater than 15 mm.
4.2.6 Fixture stability
Conduct the test according to the method specified in 5.7. The helmet cannot
be separated from the headform.
4.2.7 Strength properties of helmet wearing
Conduct the test according to the method specified in 5.8. There must be no
elongation of more than 25 mm, torn lace, connector falling off or buckle loosing.
4.2.8 Collision energy absorption of helmet
It shall be measured by acceleration transferred to the headform and its acting
time. Conduct the test in the method specified in 5.9 and.
a) Class-A helmet shall meet the following technical requirements.
1) Acceleration peak value is not greater than 300 g;
2) The acting time of which the acceleration peak value exceeds 150 g
should be less than 4 ms.
b) Class-B helmet shall meet the following technical requirements.
1) Acceleration peak value is not greater than 400 g;
2) The acting time of which the acceleration peak value exceeds 200 g
should be less than 2 ms (except the situation when he acceleration
peak value does not exceed 300 g);
3) The acting time of which the acceleration peak value exceeds 150 g
should be less than 4 ms.
Note. g=9.80665 m/s2.
4.2.9 Penetration resistance performance of helmet
Conduct the test in the method specified in 5.10. Steel pricker cannot penetrate
the helmet to touch the headform.
5 Test methods
5.1 Ambient conditions for laboratory
Temperature. 21°C ± 5°C; relative humidity. 40% ~ 80%.
5.2 Helmet structure, specifications, protect range test
5.2.1 Test tools
Length measuring instrument of which the division value is 0.5 mm; leveler;
protractor of which the division value is not greater than 0.1°; and testing
headforms of small, medium and large sizes.
5.2.2 Test procedures
Use measuring instrument to detect the connector of shell’s inner and outer
surfaces, chin strap, and the highest open position of lens. Measure helmet’s
specifications and protect range. put the helmet on the testing headform of
corresponding...
......
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