KENYA STANDARD  DKS 2944 :2021 
 ICS 59.080  
First   Edition  
  
 © KEBS 2021  
 Disposable helmet  liner  Specification  
 
 
 
 
DKS 2944 :2021 
ii © KEBS 2021 – All rights reserved  
 TECHNICAL COMMITTEE REPRESENTATION  
The following organizations were represented on the Technical Committee:  
 
Kenya Bureau of Standards — Secretariat  
 
REVISION  OF KENYA STANDARDS  
In order to keep abreast of progress in industry, Kenya Standards shall be regularly reviewed.  Su ggestions for 
improvements to published standards, addressed to the Managing Director, Kenya Bureau of Standards, are 
welcome.  
© Kenya Bureau of Standards, 2021 
Copyright. Users are reminded that by virtue of Section 25 of the Copyright Act, Cap. 130 of 2001 of  the Laws of Kenya, copyright subsists 
in all Kenya Standards and except as provided under Section 25 of this Act, no Kenya Standard produced by Kenya Bureau of Sta ndards 
may be reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writing from the 
Managing Director.   KENYA STANDARD  DKS 2944 :2021 
ICS 59.080 
First   Edition  
 
© KEBS 2021  – All rights reserved  iii 
  Disposable helmet liner Specification  
 
 
  
Kenya Bureau of Standards, Popo Road, Off Mombasa Road,  
P.O. Box 54974 - 00200,  Nairobi, Kenya  
 +254 020 6948000, + 254 722202137, + 254 734600471  
 info@kebs.org  
 @KEBS_ke  
 kenya bureau of standards (kebs)  
  
DKS 2944 :2021 
iv © KEBS 2021 – All rights reserved  
 Foreword  
This Kenya Standard was prepared by the Technical Committee on Readymade Garments under the guidance 
of the Standards Project Committee, and it is in accordance with the procedures of the Kenya Bureau of 
Standards.  
Helmet liners protects helmet from sweat, stains  and odour.  This standard  will protect  the users from  
substandard  disposable helmet  liners.  
In the preparation of this standard reference was made to the  following documents:  
KS 2933 surgical cap  – Specification  
Acknowledgement is made for the assistance received from these sources.  DKS 2944 :2021   
 
© KEBS 2021– All rights reserved   
 1.          SCOPE  
 
 This Kenya Standard  prescribes the minimum requirements for disposable helmet liners.   
 
2. Normative references  
 
The following referenced documents referred to in the text in such a way that some or all of their content 
constitutes requirements of this document. For dated refer ences, only the edition cited applies. For undated 
references, the latest edition of the referenced document (including any amendments) applies . 
 
KS 816 -Methods for determination of absorbency of absorbent textile materials  
 
KS ISO 1833 Textiles — Quantita tive chemical analysis (relevant parts)  
 
KS ISO 9073 -1, Textiles — Test methods for nonwovens Part 1: Determination of mass per unit area  
 
KS ISO 9073 -4, Textiles — Test methods for nonwovens — Part 4: Determination of tear resistance  
 
 KS ISO 9073 -15, Tex tiles - Test methods for nonwovens part 15: Determination of air permeability  
 
KS ISO 9073 -18, Textiles — Test methods for nonwovens Part 18: Determination of breaking strength and 
elongation of nonwoven materials using the grab tensile test  
 
 
3. TERMS AND  DEFINITIONS  
 
 For the purpose of this standard, the following definition apply  
3.1 Air Permeability  
 
Velocity of an air flow passing perpendicularly through a test specimen under a prescribed air pressure 
differential over a certain time period  
 
Note: Air  permeability is expressed in litres per square centimeter per second (l/cm2.s), or any other 
equivalent unit  
 
3.2 Absorption capacity  
 
Mass of liquid that is absorbed per unit mass of test piece  
 
 
4. REQUIREMENT  
 
4.1 Materials  
 
4.1.1 General  
 
All materials, dyes and chemicals used in the manufacture of disposable helmet liners  shall not cause any 
undesirable effects to the skin.  
 
 
 
  
© KEBS 2021  – All rights reserved  iii 
  4.1.2 Securing mechanism  
 
The disposable helmet liners shall be fitted with an approximate securing mechanism th at fits comfortably 
around the head of the wearer.  
 
4.2 Workmanship  
 
The disposable helmet liners shall be made with first class workmanship throughout and shall be free from 
defects that affect their appearance and/or serviceability, and free from marks s pots or stains incurred in their 
manufacture.  
 
4.3 Performance requirements  
 
Disposable helmet liner s shall comply with the performance requirements given in Table 1 when tested in 
accordance with the test methods prescribed therein.  
 
 
Table 1 — Performance requirements for disposable helmet liners  
S/N Characteristic  
 Requirement  Test method  
i.  Absorption capacity, seconds  Above 60  KS 816 Method 2  
ii.  Air Permeability, l/cm2.s, min  0.015  KS ISO 9073 -15* 
iii.  Breaking Strength, N, 
min Cross direction  15 KS ISO 9073 -18 
Machine 
direction  35  
iv.  Mass per unit area, g/m2 ,min  13 KS ISO 9073 -1 
v.  Fiber composition  100% Polyolefin  KS ISO 1833  
vi.  Tearing strength, N, 
min Cross direction  6 KS ISO 9073 -4 
Machine 
direction  17 take the lower 
value  
*use differential pressure of 100 Pa across the specimen (ISO 9327)  
 
 
 
4.3 Restricted colorants  
If helmet liners are dyed, it shall be free from colorants listed in KS ISO 14632 parts 1 & 3 and KS ISO 16373 -
2 & 3. Dyestuffs shall be identified in accordance with KS ISO 16373 -1. 
 
5. PACKAGING  
5.1 All di sposable helmet liners shall be packaged in a suitable acceptable packaging material.  
 
 
 
  
iv © KEBS 2021 – All rights reserved  
  6. LABELLING   
6.1 The following information in English shall be legibly and indelibly marked on  the secondary 
packaging in which the disposable helmet liners is supplied  
a) manufacturers name and address  
b) country of manufacture   
c) Number of units  
d) The colour  of the product  
e) Instructions for use and disposal