DRAFT UGANDA STANDARD  
  DUS 774  
Third Edition  
2022 -mm-dd 
 
 
 Reference number  
DUS 774: 2022  
© UNBS 2022   
  
Protective helmets for motorcycl e users  — Specification  
 DUS 774: 2022  
ii © UNBS 2022  – All rights reserv ed 
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necessary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 2022  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior wr itten 
permission from UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: +256 41 4 333 2 50/1/2/3  
Fax: +256 41 4 286 123  
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  WDUS 774:2022  
© UNBS 2022  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ .............................  v 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 General  requirements  ................................ ................................ ................................ ...........................  3 
4.1 Materials  ................................ ................................ ................................ ................................ .................  3 
4.2 The shell  ................................ ................................ ................................ ................................ .................  4 
4.3 Protective Padding  ................................ ................................ ................................ ................................  4 
4.4 Comfort Padding  ................................ ................................ ................................ ................................ ... 4 
4.5 Retention System (chin strap)  ................................ ................................ ................................ .............  4 
5 Construction requirements  ................................ ................................ ................................ ..................  4 
5.1 General  ................................ ................................ ................................ ................................ ...................  4 
5.2 Shell  ................................ ................................ ................................ ................................ ........................  4 
5.3 Retention system  ................................ ................................ ................................ ................................ ... 5 
5.4 Effectiveness of retention  system  ................................ ................................ ................................ ....... 5 
5.5 Strength of retention  system  ................................ ................................ ................................ ...............  6 
5.6 Peripheral vision  ................................ ................................ ................................ ................................ .... 6 
5.7 Penetration  resistance  ................................ ................................ ................................ ..........................  7 
5.8 Sound attenuation  ................................ ................................ ................................ ................................ . 7 
5.9 Rigidity  ................................ ................................ ................................ ................................ ...................  7 
5.10  Shock  absorption  ................................ ................................ ................................ ................................ .. 7 
5.11  Visors  ................................ ................................ ................................ ................................ ......................  7 
5.12  Helmet goggles  ................................ ................................ ................................ ................................ ...... 7 
5.12.1  Impact strength properties  ................................ ................................ ................................ ...................  7 
5.12.2  Visible light tran smittance  ................................ ................................ ................................ ....................  7 
5.12.3  Haze  ................................ ................................ ................................ ................................ ........................  7 
5.12.4  Wear resistance  ................................ ................................ ................................ ................................ ..... 7 
5.13  Mass  ................................ ................................ ................................ ................................ ........................  8 
5.14  Sizes ................................ ................................ ................................ ................................ ........................  8 
6 Packaging  ................................ ................................ ................................ ................................ ...............  8 
7 Labelling  ................................ ................................ ................................ ................................ .................  8 
Annex  A (normative)  Conditioning Environments  ................................ ................................ .........................  9 
A.1 General  ................................ ................................ ................................ ................................ ...................  9 
A.2 Ambient  conditionin g ................................ ................................ ................................ ............................  9 
A.3 Low temperature  conditioning  ................................ ................................ ................................ .............  9 
A.4 Elevated temperature  condition  ................................ ................................ ................................ ...........  9 
A.5 Water immersion  condition  ................................ ................................ ................................ ..................  9 
Annex  B (normative)  Peripheral vision test  ................................ ................................ ................................ .. 10 
B.1 Apparatus  ................................ ................................ ................................ ................................ .............  10 
B.2 Procedure  ................................ ................................ ................................ ................................ .............  10 
B.3 Results  ................................ ................................ ................................ ................................ ..................  10 
Annex  C (normative)  Penetration resistance test  ................................ ................................ ........................  11 
C.1 Apparatus  ................................ ................................ ................................ ................................ .............  11 
C.2 Procedure  ................................ ................................ ................................ ................................ .............  11 
Annex  D (normative)  Effec tiveness of retention system test  ................................ ................................ ..... 12 
D.1 Apparatus  ................................ ................................ ................................ ................................ .............  12 
D.2 Procedure  ................................ ................................ ................................ ................................ .............  12 DUS 774: 2022  
iv © UNBS 2022  – All rights reserv ed 
 Annex  E (normative)  Strength of retention system test  ................................ ................................ .............  13 
E.1 Apparatus  ................................ ................................ ................................ ................................ ............  13 
E.2 Procedure  ................................ ................................ ................................ ................................ ............  13 
Annex  F (normative)  Shock absorption test  ................................ ................................ ................................  15 
F.1 Apparatus  ................................ ................................ ................................ ................................ ............  15 
F.2 System verification  ................................ ................................ ................................ .............................  15 
F.3 Helmet impact test  locations  ................................ ................................ ................................ .............  16 
F.4 Method  ................................ ................................ ................................ ................................ .................  16 
Annex  G (normativ e)  Rigidity test  ................................ ................................ ................................ .................  17 
G.1 Procedure  ................................ ................................ ................................ ................................ ............  17 
Annex H (Normative)  Audibility test  ................................ ................................ ................................ .............  18 
H.1 Apparatus  ................................ ................................ ................................ ................................ ............  18 
H.1.1  Measuring apparatus  ................................ ................................ ................................ ..........................  18 
H.1.2  Sound source  ................................ ................................ ................................ ................................ ...... 18 
H.2 Procedure  ................................ ................................ ................................ ................................ ............  18 
Annex J (Normative)  Sound attenuation test  ................................ ................................ ...............................  19 
Bibliography  ................................ ................................ ................................ ................................ .....................  20 
 WDUS 774:2022  
© UNBS 2022  – All rights reserved  v 
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade , Industry and 
Cooperatives established under Cap 327 , of the Laws of Uganda , as amended .  UNBS is mandated to co -
ordinate the elaboration of standards and is   
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT  Agreement  of the World Trade Organisation (WTO).  
The work of pre paring Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of key stakeholders 
including government, academia, consumer groups, private sector a nd other interested parties.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending the draft standards 
for approval and d eclaration as Uganda Standards by the National Standards Council.  
The committee responsible for this document is Technical Committee UNBS /TC 308, Personal  protective gear  
 DRAFT UGANDA STANDARD  DUS 774: 2022  
 
© UNBS 2022 – All rights reserved  1 
 Protective  helmets for motorcycl e users  — Specification  
1 Scope  
This draft Uganda Standard specifies the requirements and test methods for protective helmets intended for 
the protection of the driver or of the rider and the passenger while riding motorcycles of any kind, including 
motorized bicycles/tricycles, mopeds, motorbikes, quad bi kes and scooters with or without side -car 
This standard excludes helmets worn by participants in the competitive events.  
2 Normative references  
There are no normative references in this document . 
3 Terms and definitions  
For the purposes of this document, t he following terms and definitions apply.  
ISO and IEC maintain terminological databases for use in standardization at the following addresses:  
— ISO Online browsing platform: available at http://www.iso.org/obp  
3.1 
acceleration  
rate of change of velocity  measured in m/s2 
3.2 
acceleration of a body due gravity  
rate of change of velocity of a free falling body  
3.3 
basic plane of a headform  
plane relative to the headform that corresponds to the basic plane of the human head  
3.4 
basic plane of the human head (Frankfort Horizontal Plane)  
plane that is located at the central point of the upper margin of the external auditory meatus (portion) and the 
inferior margins of the orbits of the eyes (orbitale)  
3.5 
central vertical axis  
line relative to the headform that  lies in the median plane of symmetry, and that is normal to the basic plane at 
a point equidistant from the front and back of the headform  
3.6 
crown  
point where the central vertical axis meets the top of the headform  DUS 774: 2022  
2 © UNBS 2022  – All rights reserved  
 3.7 
cushioning material  
soft material used to ensure a comfortable fit of the helmet on the head  
3.8 
drop height  
vertical distance between the lowest point (impact point) of the elevated helmet and the impact surface on a 
drop test apparatus  
3.9 
fastening system  
devices used to connect all co mponents of the helmet  
3.10 
frontal plane  
vertical plane that is perpendicular to the median and reference planes and passes through the crown (See 
Figure 2 ) 
3.11 
helmet  
protective gear to be worn on the head intended to reduce the risk of head injury whil e riding on a motorcycle 
and including  
 a shock attenuating  system,  
 the retention system,  and 
 manufacturer’s attachments (if  any) 
3.12 
helmet model  
category of helmets that do no differ in such essential respects as the materials, dimensions, construction o f 
the helmet, retention system or the protective padding  
3.13 
helmet positioning index (HPI)  
the vertical distance measured at the median plane, from the front edge of the helmet to the basic plane, when 
the helmet is placed on the reference headform  
3.14 
horizontal plane  
plane that passes across the body at right angles to both the frontal and median plane  
3.15 
maximum value of acceleration, amax  
highest point on the acceleration -time curve, encountered during impact, in units of g  
3.16 
median plane  
vertical plane that passes through the headform from front to back and divides the headform into right and left 
halves  
3.17 
permanent marking and warning  
information that remains legible and cannot be removed under conditions of normal u se 
3.18 
rear 
Point at the posterior intersection of the median and reference planes  DUS 774: 2022  
© UNBS 2022  – All rig hts reserved  3 
 3.19 
reference plane  
a construction plane parallel to the basic plane of the headform at a distance from it which is of the size of the 
headform  
3.20 
retention system  
syste m which secures the helmet firmly to the head by passing under the mandible in whole or in part when 
adjusted according to manufacturer’s instructions  
3.21 
support assembly  
the drop assembly in the monorail or twin wire drop system minus the weight of the headform, ball clamp 
bolts, and  accelerometer  
3.22 
test area  
the area on and above the test line where an impact site shall be located  
3.23 
test line  
the line that defines the boundaries of the test area  
3.24 
peak  
an attachment to the helmet intended to re duce sun glare  
3.25 
visor  
a transparent protective screen extending over the eyes and covering part or all of the face  
3.26 
Motorcycle users  
a rider or passenger of the motorcycle  
3.27 
shell  
This is the strong outer surface of the helmet that distributes t he impact over a large surface area, and 
therefore reduces the local forces applied to the skull and brain  
3.28 
Helmet goggles  
close -fitting glasses with side shields, for protecting the eyes from glare and any foreign objects such as dust, 
water  
4 General  requirements  
4.1 Materials  
4.1.1  All materials used shall be known not to be adversely affected by ordinary household soap and 
cleaners as recommended by the manufacturer. Paints, glues and finishes used in manufacturing shall be 
compatible with the  materials used in the construction of the helmet . 
4.1.2  Material coming in contact with wearer’s head shall not be of any type known to cause skin irritation or 
disease or undergo significant loss of strength, flexibility, or other physical changes as a r esult of contact with 
perspiration, oil or grease from the wearer’s head.  
4.1.3  Materials used shall not emit any toxic substances that are detrimental to human health  DUS 774: 2022  
4 © UNBS 2022  – All rights reserved  
 4.1.4 Adhesive material used to attach padding or straps to the helmet shall be of a for mulation that will not 
alter the chemical or physical properties of the materials to an extent as to reduce their protective  qualities.  
4.1.5 All materials used in the fabrication of helmets shall be known to be suitable for use in the design of 
protective  helmets. The materials shall not undergo appreciable alteration due to aging or normal use, such as 
exposure to sun, extremes of temperature, and rain. All materials used in the construction of the helmet shall 
be resistant to polymeric changes /  physical  changes when exposed to temperatures from -10 °C to 50 °C . 
4.2 The shell  
The shell  shall be  designed to deform during collision . It provides protection against direct penetration and it 
also protects the energy absorbing padding inside the helmet from abr asions and knocks during daily use   
4.3 Protective Padding  
It shall be of expanded polystyrene or any other material having similar properties  
4.4 Comfort Padding  
It shall be of expanded polyurethane foam, polyethylene or  any other suitable material having  similar 
properties  
4.5 Retention System  (chin strap)  
The criteria for selection of material for chin strap and headband shall be sweat -resistant, non - irritant and 
shall not be known to cause skin disease s 
5 Construction requirements  
5.1 General  
5.1.1  The protective helmet may be fitted with ear flaps and a neck curtain. It may also have a detachable 
peak, a visor and may also have a lower face cover  
5.1.2  Ventilation shall be provided for increasing the comfort of the user 
5.1.3  Where means for attaching a visor are not provided, the profile at the front edge shall not prevent the 
wearing of goggles  
5.1.4  The helmets goggles should be free of obvious damage, dents among other defects  
5.2 Shell  
5.2.1  The shell shall cover all areas above plane AA and shall  extend 'downwards at least as far as the 
lines CDEF on both sides on the headform (see Fig. 2A ).  
5.2.2  At the rear, the rigid parts and, in particular. the shell shall not be within a cylinder of diameter 100 
mm, with axis situated at the inter section of  the medium plane of symmetry of the headform and of a plane 
parallel to and 110 mm below the reference plane ( see Fig. 2B ).  
5.2.3  The helmet shall not  affect the wearer's ability  to hear. Ventilation may be provided for increasing  the 
comfort of the user. The outer surface shall be perfectly smooth. Above the reference plane, the shape shall 
be in the form of a continuous, convex curve. except where shaping is provided for functional purposes. Below 
the reference p lane, irregularities in the curv e shall  be smoothly faired. Th e shell shall not i ncorporate an 
Integral peak, but may incorporate in integral lower face cover. Where means for attaching a visor are not 
provided, the profile at the front edge shall not prevent the wearing of goggles.  DUS 774: 2022  
© UNBS 2022  – All rig hts reserved  5 
 5.2.4  There  shall be no external projections greater than 5 mm above the outer surface of the shell. Where 
a goggle fitting is provided at the rear of the helmet and is designed to be detachable, this requirement shall 
not apply to such a fitting  
5.2.5  Any external p rojections other than press -fasteners shall be smooth and adequately faired. Rivet 
heads shall be radiused and shall not project more than 2 mm above  the outer surface of the shell  
 
5.3 Retention system  
5.3.1  The helmet shal l be held in place on the wearer's head by means of a retention system which is 
secured under the lower jaw. All parts of the retention system shall be permanently attached to the system or 
to the helmet.  
5.3.2  The minimum width of the retention system str aps shall be 15 mm.  
5.3.3 If the retention system includes a chin -strap, the strap shall be not less than 20 mm wide under a  load 
of 150 ± 5 N.  The chin strap may not include a chin -cup since the latter is integral with the shell.  
5.3.4 Chin straps shall b e fitted with a device to adjust and maintain tension in the strap.  
5.3.5  If a retention system includes a quick -release mechanism, then the method of release of this 
mechanism shall be self -evident. Any levers, tabs, buttons or other components which need  to be operated to 
release the mechanism shall be coloured red , those parts of the rest of the system which are visible when 
closed shall not be similarly coloured, and the mode of operation shall be permanently indicated.  
5.3.6 The buckle of the retention  system shall be designed so as to preclude any possibility of incorrect  
manipulation. It shall not be possible for the buckle to be left in a partially closed position.  
5.4 Effectiveness of retention  system  
When tested in accordance with annex D  at ambien t temperature, the helmet shall remain on the test 
headform.  DUS 774: 2022  
6 © UNBS 2022  – All rights reserved  
 5.5 Strength of retention  system  
When tested in accordance with annex E , the retention system shall not detach and the maximum elongation 
of the retention system shall not exceed 25 mm  when measu red between preliminary and test load positions.  
5.6 Peripheral vision  
All helmets shall allow unobstructed vision through a minimum angle of 105° to the left and right sides of the 
median plane when measured in accordance with the procedure described in  Annex B . 
 
Fig 2-Orientational Planes  
Table 1: Head  form (Dimensions in millimetres)  
Headforms  Size X Y AC HD 
A 500 24 89.5 80 88 
C 520 25 93 82 90 
E 540 26 96 84 92 
G 560 27 99 86 94 
J 570 27.5 102.5  87 95 
K 580 28 104 88 96 
M 600 29 107 90 98 
O 620 30 110 92 100 
 DUS 774: 2022  
© UNBS 2022  – All rig hts reserved  7 
 5.7 Penet ration  resistance  
When tested in accordance with Annex C  at ambient temperature no contact with the headform by the test 
dowel shall be made within any aperture on the helmet  
5.8 Sound attenuation  
When measured in accordance with Annex J , the sound drop sh all not be more tha n 10 dB.  
5.9 Rigidity  
When tested in accordance with Annex G 
a) In the test along each axis, the deformation measured under the 630 N load shall not exceed that 
measured under the initial 30 N load by more than 40 mm.  
b) After restoration of t he 30 N load, the deformation measured shall not exceed that measured under 
the initial 30 N load by more than 15 mm.  
5.10 Shock  absorption  
When tested in accordance with Annex F , the peak headform acceleration (amax) shall not exceed 275 g.  
5.11 Visors  
5.11.1 The systems of attachment of a visor to a helmet shall be such that the visor is removable. It must be 
possible to manoeuvre the visor out of the field of vision with a simple movement of one hand.  
5.11.2 Visors shall be free from any significant defe cts likely to impair the vision, such as bubbles, scratches, 
inclusions, dull spots, holes, mould marks, scratches or other defects originating from the manufacturing 
process in the field of vision.  
5.11.3 Visors shall in addition be sufficiently transpare nt, shall not cause any noticeable distortion of object 
as seen through the visor, shall be resistant to abrasion, not easily broken and shall not give rise to any 
confusion between the colour used in road traffic sign and signals.  
5.12 Helmet goggles  
5.12.1 Impact strength properties  
The goggles shall not be broken or fragments with an edge angle of less than 60° appear after being broken.  
5.12.2 Visible light transmittance  
The visible light transmittance in the visual field of the goggles should be greate r than or equal to 85%.  
5.12.3 Haze  
The haze in the visual field of the goggles should be less than or equal t o 10%. 
5.12. 4 Wear resistance  
Carry out the sand falling test according to the method specified in (check for test method) , and the goggles 
should  be free of obvious damage, dents  among other defects , etc.;  DUS 774: 2022  
8 © UNBS 2022  – All rights reserved  
 5.13 Mass  
The mass  of the helmet shall not exceed 1500 g   
5.14 Sizes  
Helmets shall be of the sizes matching to the sizes of headform of 500, 510, 520, 530, 540, 550, 560, 570, 
580 590, 600, 610, 620, 630 and 640 mm   
6 Packaging  
Helmets shall be packaged in materials that  prevent them from damage  during transportation and storage  
7 Labelling  
Helmets shall be legibly and indelibly marked/labelled with the following information:  
a) manufacturer ’s name,  address and/or trademark;  
b) the model name or model number of the product;  
c) mass of helmet to the nearest 20 g;  
d) the size or size range of the circumference of the helmet, quoted as the circumference (in millimetres) 
of the head which the helmet is intended t o fit; 
e) the date of manufacture of the product ; 
f) country of origin ; 
g) warnings ; and  
h) instructions  DUS 774: 2022  
© UNBS 2022  – All rig hts reserved  9 
 Annex  A 
(normative)  
 
Conditioning Environments  
A.1 General  
A.1.1  Helmets shall be conditioned to one of the following environments prior to testing. All test helme ts 
shall be stabilized within the ambient condition for 4 h to 24 h prior to further conditioning and testing.  
A.1.2  After each conditioning , the helmet shall be visually inspected. There shall be no signs of cracking or 
appreciable distortion of the retro  reflective material  
A.2 Ambient  conditioning  
The sample shall be exposed to a temperature of 22 °C ± 5 °C and a relative humidity not exceeding 75 % for 
4 h to 24 h.  
A.3 Low temperature  conditioning  
The sample shall be exposed to a temperature of -10 °C ±  3 °C for 4 h to 24 h. Testing shall begin within 60 s 
of removal from the low temperature conditioning chamber and all helmet testing shall be completed within 5 
min after removal from the conditioning environment. Helmets may be returned to the condition ing 
environment in order to meet this requirement. Helmets shall remain in the conditioning environment for 15 
min for each 5 min that they are out of the conditioning  environment.  
A.4 Elevated temperature  condition  
The sample shall be exposed to a tempera ture of 50 °C ± 3 °C for 4 h to 24 h. Testing shall begin within 60 s 
of removal from the low temperature conditioning chamber and all helmet testing shall be completed within 5 
min after removal from the conditioning environment. Helmets may be returned t o the conditioning 
environment in order to meet this requirement. Helmets shall remain in the conditioning environment for 15 
minutes for each 5 min that they are out of the conditioning  environment.  
A.5 Water immersion  condition  
The sample shall be fully immersed , “crown” down in potable water at a te mperature of 23 °C ± 5 °C to a 
crown depth of 305 mm ± 25 mm for 4 h to 24 h.  
Testing shall begin within 60 s of r emoval from the low temperature -conditioning chamber and all helmet 
testing shall be completed  within 5 min after removal from the conditioning environment. Helmets may be 
returned to the conditioning environment in order to meet this requirement. Helmets shall remain in the 
conditioning environment for 15 min for each 5 min that they are out of th e conditioning  environment.  DUS 774: 2022  
10 © UNBS 2022  – All rights reserved  
 Annex  B 
(normative)  
 
Peripheral vision test  
B.1 Apparatus  
Measurement may be performed with a physical measuring device (that is, peripheral vision template or a test 
headform with point K clearly marked) or with laser measureme nt equipment.  
B.2 Procedure  
B.2.1 Position the helmet on a reference headform in accordance with the HPI and place a 50 N preload 
ballast on top of the helmet to set the comfort or fit padding.  
NOTE Peripheral vision clearance may be determined when the he lmet is positioned for marking the test lines.  
B.2.2 Peripheral vision is measured horizontally from each side of the median plane around the point K (see 
Figure 3)  
B.2.3 Point K is located on the front surface of the reference headform at the intersection  of the basic and 
median planes  
B.3 Results  
The vision shall not be obstructed within 1050 from the point K on  each side of the median plane.  
Figure 3 — Principal planes and reference points of a headform  
DUS 774: 2022  
© UNBS 2022  – All rig hts reserved  11 
 Annex  C 
(normative)  
 
Penetration resistance test  
C.1 Apparatus  
The apparatus for the penetration test shall include  a full size reference headform  
C.2 Procedure  
C.2.1  Position the helmet on a reference headform in accordance with the HPI and place a 50 N preload 
ballast on top of the helmet to set the com fort or fit padding.  
C.2.2  Using a metal test dowel with a diameter of 20 mm (see Figure 4) attempt to make contact with the 
headform by trying to enter any part of the metal dowel end through all of the openings of the helmet.  
C.2.3  Record the location of  any metal dowel to headform contact.  
Figure 4 — Metal dowel for Penetration resistance test  
  
DUS 774: 2022  
12 © UNBS 2022  – All rights reserved  
 Annex  D 
(normative)  
 
Effectiveness of retention system test  
D.1 Apparatus  
The apparatus for the retention system effectiveness test shall include a full size re ference headform  
D.2 Procedure  
D.2.1  Secure the reference headform to a fixture that will prevent headform movement when a tangential 
force is applied to the helmet.  
D.2.2  Position the helmet on a reference headform in accordance with the manufacturer’s i nstruction. A 
flexible strap and hook mechanism shall be attached to the front lower edge of the helmet such that it is in line 
with the mid -sagital plane (see Figure 2).  
D.2.3  The total mass of the falling weight guide apparatus  shall be 3 kg ± 0.1 kg dr op weight and shall be 
able to accommodate drop heights up to 1000 mm.  
D.2.4  A 10 kg ±  0.1 kg drop weight shall then be raised to a height of 500 mm ± 5 mm. and released (see 
Figure 5).  
D.2.5  This procedure shall be repeated with the headform rotated 1800 and the hook mechanism attached 
to the rear edge of the  helmet.  
Figure 5 — Typical retention system effectiveness test apparatus  
DUS 774: 2022  
© UNBS 2022  – All rig hts reserved  13 
 Annex  E 
(normative)  
 
Strength of retention system test  
E.1 Apparatus  
E.1.1  The retention system strength test device consists  of both an adjustable loading mechanism by which 
a static tensile load is applied to the helmet retention assembly and a means for holding the test headform and 
helmet stationary.  
E.1.2  The retention system test device shall allow the retention assembly to be fastened around two freely 
moving rollers, both of which have a 12.5 mm diameter on a 75 mm centre -to-centre separation, and which 
are mounted on the adjustable portion of the tensile loading device (see Figure  6). 
E.2 Procedure  
E.2.1  Place the subje ct helmet on the test headform such that the basic plane is normal to the force of 
gravity and adjust it in accordan ce with the manufacturer’s HPI.  
E.2.2  Securely fasten the retention system around the two freely moving rollers in a manner that avoids 
contact between t he rollers and helmet’s buckle.  
E.2.3  Apply a preliminary load of 45 N ± 3 N in the direction normal to the basic plane to the retention 
system and hold for a minimum of 30 s. Record the displacement measurement on the movable test  device.  
E.2.4 Increase the load to 500 N ± 5 N and maintain this for 120 s, +0 s, -10 s by adjusting the load applied 
to the  retention system as necessary.  
E.2.5  After 120 s +0 s, -10 s) at full test load, measure and record the displacement of the retention system. 
The maximum elongation shall be the difference between the initial measurement and the measurement taken 
after 120 s  
 
 DUS 774: 2022  
14 © UNBS 2022  – All rights reserved  
 
 Figure 6 — Typical retention 
system strength test apparatus  DUS 774: 2022  
© UNBS 2022  – All rig hts reserved  15 
 Annex  F 
(normative)  
 
Shock absorption test  
F.1 Apparatus  
The test apparatus  for the shock absorption test shall consist of the following:  
a) the test headform shall be mounted on a guided freefall system as shown in Figure 7 with an 
adjustable mounting for the helmeted headform to permit impacts to be delivered to any location on 
the helmet at or above the test line. A monorail guided freefall system shall also be acceptable. The 
total mass of this support assembly shall not exceed 25 % of the combined mass of the drop 
assembly (that is, supporting assembly plus headform). The centre  of gravity of the drop -assembly 
unit shall lie within a cone with the vertex and forming at most 10° included angle with the vertex as 
the point of impact.  
b) a linear accelerometer shall be placed at a centre of gravity of the test headform and its sensitiv e axis 
shall be aligned within 5° of the vertical when the helmet and headform are in the impact position. The 
accelerometer shall be capable of withstanding a maximum acceleration of 1 000 g without damage 
and shall have a frequency response of at least 5  Hz to 900 Hz. A triaxial accelerometer with identical 
performance specifications is also  acceptable.  
c) the flat anvil shall be made of steel or another similar rigid metal and shall be firmly attached to the 
base of the drop assembly. The impact face shall have a minimum diameter of 150  mm. 
d) the hemispherical anvil shall be made of steel or another similar rigid metal and shall be firmly 
attached to the base of the drop assembly. The hemispherical anvil shall have a hemispherical impact 
surface with a radius of 48 ± 1  mm. 
e) the rigid mount for the anvil shall consist of a solid mass of at least 135 kg, the upper surface of which 
shall consist  of a steel  plate  with a minimum  thickness  of 12 mm and minimum  surface  area of 0.1 m2. 
f) the data acquisition system shall be capable of collecting impact data at a rate of no t less than 10 kHz 
per channel.  
F.2 System verification  
F.2.1  The shock absorption test instrumentation shall be verified before and after each series of tests (at 
least at the beginning and end of each t est day) by dropping a spherical impactor onto a Modular Elastomer 
Programmer (MEP) test surface.  
F.2.2  The spherical impactor shall be a device made of low resonance material, for example, magnesium, 
aluminium alloy, or stainless steel that couples mechan ically with the ball arm connector of the drop assembly 
in place of the impact test headform. When mounted, the device presents a spherically machined impact face 
with a radius of 73 mm on its bottom surface. All radii from the centre of the curvature of t he impact face to its 
outer edge shall form angles of no less than 400 with the downward vertical axis. The centre of curvature shall 
be within 5 mm of the vertical axis drawn through the centre of the ball arm. The total mass of the spherical 
impactor dro p assembly shall be 5.0 kg ± 0.1  kg. 
F.2.3  The MEP shall be 152 mm in diameter and 25 mm thick, and shall have a durometer of 60 ± 2 shore 
A. The MEP shall be affixed to the top surface of a flat 6.35 mm thick aluminium plate. The geometric centre 
of the M EP pad shall be aligned with the centre vertical axis of the accelerometer.  DUS 774: 2022  
16 © UNBS 2022  – All rights reserved  
 F.2.4  The impactor shall be dropped onto the MEP at an impact velocity of 5.44 m/s ± 2 % as measured 
within the last 40 mm of free fall of the impactor. Typically, this requires a minimum drop height of 1.50 metres 
plus a height adjustment to account for friction losses. Six (6) impacts, at intervals of 75 s ± 15 s, shall be 
performed at the beginning and end of the test series. The first 3 of 6 impacts shall be considered warm -up 
drops, and their impact values shall be discarded from the series. The second 3 impacts shall be recorded. All 
recorded impacts shall fall within the range of 380 g to 425 g. The mean of the 3 post -test results shall not 
differ by more than 5% from the mean  of the pre -test results. Otherwise, the results shall be discarded and the 
tests repeated with new samples after the source of this difference has been  rectified.  
F.2.5  The components of the data acquisition system, including all transducers shall be cali brated to 
traceable national reference standards at an interval of not greater than five years.  
F.3 Helmet impact test  locations  
Each helmet shall be tested at four impact locations on or above the test line described in 6.3. Each impact 
location shall be a distance of at least one -fifth of the circumference of the test headform from any prior impact 
location on the helmet.  
F.4 Method  
F.4.1  The helmet shall be placed on the appropriate headform according to the manufacturer’s helmet 
positioning index (HPI).  The helmet shall be dropped onto the flat anvil with an impact velocity of 6.0 m/s ± 3 
%. Typically, this requires a minimum drop height of 1.83 m, plus a height adjustment to account for friction 
losses. The helmet shall be dropped onto the hemispherical  anvil with an impact velocity of 5.2 m/s ± 3 %. 
Typically, this requires a minimum drop height of 1.38 m, plus a height adjustment to account for friction 
losses.  
F.4.2  The impact velocity shall be measured during the last 25 mm free -fall for each test. F ollowing impact, 
the drop assembly shall be raised and the headform shall be oriented to another impact site.  
F.4.3  The first impact shall be made not more than 60 s after the helmet has been removed from the 
conditioning environment. Following testing, th e helmet shall be immediately returned to its conditioning 
environment for a minimum of 15 min before another impact test is conducted.  
 
 
 
 
 
 DUS 774: 2022  
© UNBS 2022  – All rig hts reserved  17 
 Annex  G 
(normative)  
 
Rigidity test  
G.1 Procedure  
G.1.1  The helmet, after undergoing ambient -temperature and hygrom etry conditioning, shall be placed 
between  two parallel plates by means of which a known load can be applied along the longitudinal axis 6/ (line 
LL in  the Figure 10) or the transverse axis (line TT in the figure).  
G.1.2  The surface of the plates shall be large enough to  contain a circle of at least 65 mm in diameter. An 
initial load of 30 N shall be applied, at a minimum plates  speed of 20 mm/min, and after two minutes the 
distance between the two plates shall be measured.  
G.1.3  The load shall then be incr eased by 100 N, at a minimum plates speed of 20 mm/min, and then wait 
for two  minutes. This procedure shall be repeated until the application of a load of 630 N  
G.1.4  The load applied to the plates shall be reduced to 30 N, at a minimum plates speed of 20 mm/min; the  
distance between the plates shall then be measured.  
G.1.5  The helmet used for the test along the longitudinal axis shall be a new helmet, and another new  
helmet shall be used for the test along the transverse axis  
 
Fig-Rigidity test axes
  DUS 774: 2022  
18 © UNBS 2022  – All rights reserved  
 Annex  H 
(Normative ) 
 
Audibility test  
H.1 Apparatus  
H.1.1  Measuring apparatus  
Measuring apparatus shall consist of a headfor m and sound level meter. The microph one of sound level meter 
shall be fitted at a place corresponding to the right or left human ear's location.  
NOTE - For this test weighing network Curve A shall be used  
H.1.2  Sound source  
The sound surface shall be a  horn (which has sound pressure level range of 90 to 115 dB(A). The sound 
source shall be lo cated so that sound is incident from back of the headform.  
H.2 Procedure  
This test shall be carried out under the prevailing atmosp heric conditions and the background  noise level shall 
be such that the reading indicated  on the s ound level meter by the nois e is at least 10 dB of below that of the 
horn sound level.  
This test shall be carried out in an open space in which there is no obstacle within a radius of 12 m and no 
acoustical focussing a ffects or nearby parallel walls.  The horn shall be mounted 1. 2 m above th e ground and 
shall be fixed in a  rigid manner on a base whose mass shall be  at least 10 times that of the h orn and not le ss 
than 1 5 kg and sha ll be adjustable side ways and up and down.  
The sound waves are emitted from th e horn by using suitable 1 2 V dc  power supply and are directed towards 
the rear of the headform at the distance of 2 m .  
The two  readings are taken with and without helmet. The difference sha ll be recorded to the nearest dB  
 DUS 774: 2022  
© UNBS 2022  – All rig hts reserved  19 
 Annex J 
(Normative)  
 
Sound attenuation test  
J.1 The sound test is done with a meter mounted inside a helmeted headform at the left or the right ear 
location.  
J.2 The location should be uninterrupted for 12 m radius without any acousti c materials, as in open groun d. 
J.3 A horn is sounded (90 -115 dB, ambient sound should be 10 dB or less) 2 metres from the helmet, 
mounted rigidly 1 .2 m off the ground on a stand.  
J.4 The sound level is measured at the sound meter location with and without the helmet covering it  
 DUS 774: 2022  
20 © UNBS 2022  – All rights reserved  
 Bibliography  
[1] US 774:2011 , Protective helmets for motorcyclists - Specification  
[2] DKS 77:2012 , Protective helmets for motorcyclists – Specification  
[3] IS 4151 :1993 , Protective helmets for motorcycle riders  – Specification  
[4] Nepal standard, Protective h elmets for motorcycle riders – Specification  
 DUS 774: 2022  
© UNBS 2022 – All rights reserved  21 
 Certification marking  
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the UNBS Certification Ma rk is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conjunction with the relevant Uganda Stand ard. The 
presence of this mark on a product or in relation to a product is an assurance that the goods comply with the 
requirements of that standard under a system of supervision, control and testing in accordance with the 
certification mark scheme of the Uganda National Bureau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.   
 
 DUS 774: 2022    
 
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© UNBS 2022 – All rights reserved