DRAFT UGANDA STANDARD  
  DUS  1671  
First Edition  
2016 -12-30 
 
 
 Reference number  
DUS  1671 : 2016 
© UNBS 2016   
  
Plastic cling wrap film for food contact use  
 DUS  1671 : 2016  
ii © UNBS 2016  – All rights reserved  
 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 
responsibl e for its correct application  
© UNBS 2017   
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  written 
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: +256 414 333 250/1/2/3  
Fax: +256 414 286 123  
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  DUS  1671 :2016  
© UNBS yyyy – All rights reserved  iii 
 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 T BT Agreement of the World Trade Organisation (WTO).  
The work of preparing 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 stakeholder s 
including government, academia, consumer groups, private sector and 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 declaration as Uganda Standards by the National Standards Council.  
The committee responsible for this document is Technical Committee UNBS/TC 19 , [Packaging and 
Packaging products ]. 
 WORKI NG DRAFT UGANDA STANDARD  DUS  1671 : 2016  
 
© UNBS 2016  – All rights reserved  1 
 Plasti c cling wrap fil m for food contact use  — General 
requirements  
1 Scope  
This Standard specifies the definitions and terms, product classifications, marking, requirements, test 
methods, inspection rules, labels, packaging, transport and storage o f plastic cling wrap film for food contact 
use. 
This Standard applies to plastic cling wrap film for keeping food fresh (hereinafter referred to as cling wrap 
film) which is made of resin such as polyethylene, polyvinylchloride, polyvinyl  dichloride, processed by the 
method of monolayer or multilayer extrusion . 
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 date d references, only the edition cited applies. For undated 
references, the latest edition of the referenced document (including any amendments) applies  
DUS 1659  
ISO 2528:1995 Sheet materials – Determination of water  vapour  transmission rate – Gravimetric me thod 
ISO 15105 – 1:2007 Plastics – Film and sheeting – Determination of gas transmission rate – part 1: 
Differential pressure method  
ISO 527 – 3:1995 Plastics – Determination of tensile properties – Part 3: Test conditions for films and sheets  
ISO 14782:19 99 Plastics – Determination of haze for transparent materials.  
ISO 2859 – 5:2005 Sampling procedures for inspection by attributes – Part 5: System of sequential sampling 
plans indexed by acceptance quality limit (AQL) for lot -to-lot inspection  
ISO 291:2008  Plastics – Standard atmosphere for conditioning and testing  
ISO 4593:1993 Plastics – Film and sheeting – Determination of thickness by mechanical scanning  
ISO 6383 – 1:2015 Plastics – Film and sheeting – Determination of tear resistance – Part 1: Trouser tear 
method  
3 Terms and definitions  
For the purposes of this standard , the follo wing terms and definitions  apply.  
3.1  
cling wrap film  
film used to pack food. Has the function of self – cling and keeping food fresh or hygienic   
2 © UNBS 2016  – All rights reserved  
 3.2  
self-cling  
property of the cling wrap film itself, also called shear and peel strength   
 
3.3  
polyethylene cling wrap film  
a type of food -use cling wrap film which is made of polyethylene (PE).  
3.4  
Polyvinylchloride cling wrap film   
a type of food -use cling wrap film which is made of polyvinylchloride (PVC).  
3.5  
Polyvinyl dichloride  cling wrap film  
a type of food -use cling wrap film which is made of polyvinyl dichloride (PVDC).  
3.6  
multilayer  extrusion cling wrap film  
type of food-use cling wrap film which is processed by the method of multilayer extrusion.  
3.7  
open -wrapping  
the degrees of difficulty  of removing the film from the paper core during use.  
3.8  
anti-fogging  
property of preventing a cling wrap film from forming any water drops or water fogging on the film surface  
3.9 
Resin  
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  
4 Classification  
On the basis of the materials and the process techniques, cling wrap film can be divided i nto polyethylene 
cling wrap film, polyvinylchloride cling wrap film, polyvinyl dichloride cling wrap film, and multilayer extrusion 
cling wrap film.  
5 Requirements  
5.1 Materials  
5.1.1 Plastic  
The plastic selected shall be a food grade material.  
5.1.2 Additive  
The additives selected and their dosages shall meet the provisions set out in DUS 1659 . DUS  1671: 2016  
© UNBS 2016  – All rights reserved  3 
 5.2 Colour  
Cling wrap film shall be a transparent, normal natural colour.  
5.3 Dimensional deviation  
5.3.1 Thickness deviation  
Table 1 — Requirements for thickness deviation  
Item Index  
Thickness limit deviation  
mm 
Nominal thickness  
t 
mm ≤0.010  ±0.002  
>0.010  ±0.003  
5.3.2 Width deviation  
Table 2 — Requirements for width deviation  
Item Index  
Width  limit deviation  
mm 
Nominal width  
w 
mm ≤200 ±4 
200<W≤400  ±5 
>400  ±6 
5.3.3 Roll net weight (mass) deviation  
Table 3 — Requirements for roll net weight (mass) deviation  
Item  Index  
Roll net weight (mass)  deviation  
% -1 
5.4 Appearance  
The appearance of a cling wrap film should  meet the specifications prescribed in Table 4.  
Table 4 — Requirements for the appearance of cling wrap film  
Item Requirement  
Air bubbles, perforations and ruptures  Not permitted  
Impurities, number/m2 
>0.6 mm  
≥0.3 mm and ≤0.6 mm  
Dispersions, number/10 cm ×10 cm   
Not permitted  
Not permitted to be more than 8  
Not permitted to be more than 5  
Fish eyes and lump blocks, number/m2   
4 © UNBS 2016  – All rights reserved  
 >2 mm  
≥2mm and ≤2 mm  
Dispersions, number/10 cm ×10 cm  Not permitted  
Not permitted to be more than 20  
Not p ermitted to be more than 5  
Degree of evenness  The surface of the film is generally even, few pleats are 
permissible, a small amount of film edge exceeding the 
paper core is permissible, but this must not affect the 
pulling of the film roll out of its box.  
 
5.5 Physical — mechanical properties  
The physical -mechanical properties of a cling wrap film should meet the specifications prescribed in Table 5.  DUS  1671: 2016  
© UNBS 2016  – All rights reserved  5 
 Table 5 — Requirements for physical - mechanical properties  
Item Index  
PE PVC PVDC  Multilayer extrusion  
Tensile strength 
(longitudinal, 
transverse), MPa  ≥10 ≥15 ≥60 ≥10 
Nominal tensile 
strain at break 
(longitudinal, 
transverse), %  ≥120  ≥150  ≥50 ≥120  
Light transmissivity  ≥90 ≥92 ≥90 ≥90 
Haze, %  ≤3 ≤2 ≤3 ≤3 
Light angle tear 
stren gth 
(longitudinal, 
transverse), N/cm  ≥40 
Deviation of gas 
transmission rate – 
oxygen, %  ±20 
Deviation of gas 
transmission rate, 
carbon dioxide, %  ±20 
Deviation of water 
vapour permeance, 
% ±20 
Self – cling (shear 
and peel strength), 
N/cm2 ≥0.5 
Open - wrapping  The sample should be able to be completely peeled off within 5 seconds  
Anti- fogging  Under test conditions, no water drops should adhere to the film surface, or only small localised 
water drops. No water drops should adhere to large areas of the  cling wrap film surface.  
 
5.6 Hygienic property  
The hygienic prop erties for polyvinyl dichloride,  polyvinylchloride  and polyethylene  cling film should meet the 
provisions on hygienic properties set out in US 1659 . 
The hygienic properties for multilayer extrusion cling film should meet the provisions set out in hygienic 
standards for corresponding items of the material in direct contact with food When testing, use the plastic film 
layer which comes into contact with food to carry out hygienic property tes ts 
Cling wrap film made of other materials should meet the hygienic property provisions for specific materials set 
out in the corresponding standards.   
6 © UNBS 2016  – All rights reserved  
 6 Test methods  
6.1 Sample conditioning and testing environment  
The conditioning of any sample shall be conducted with the standard environment temperature of 23 0C ± 2  0C 
specified in ISO 291 , and the test shall be conducted under these conditions. The conditioning time shall be 
longer than 4 h.  
6.2 Dimensional deviation  
6.2.1 Thickness  
The measureme nts of the thickness shall be conducted in accordance with the provisions set out in ISO 4593  
in order to determine uniform measurements for 10 spots along the width direction of the plastic cling wrap 
film. The thickness limit deviation shall be det ermined by formula (1).  
0 m inorm ax t t tΔ 
 1) 
in which,  
tmin or max  – the actual measured maximum or minimum value in millimetres (mm)  
t0 – the nominal thickness, in millimetres (mm)  
t
 - the thickness limi t deviation, in millimetres (mm)  
6.2.2 Determination of the width  
The measurements of the width shall be conducted in accordance with the provisions set out in ISO 4592  in 
order to determine 10 isometric width measurements. The width limit deviation  shall be determined by formula 
(2). 
0 m axW WMinor W  
                                                                2) 
Wmin or max  – the actual measured maximum or minimum width, in millimetres (mm)  
W0 – the nominal width, in millimetres (mm)  
w
 - the width limit deviation, in millimetres (mm)  
6.2.3 Roll weight (mass) deviation  
Remove the outer packaging of the cling wrap film and place the cling wrap film onto a pair of scales to weigh 
it. The roll net weight (mass) deviation shall be determined by formula (3):  
100
00GGG
G
                           3) 
in which,  
G – the actual determined net weight of the roll, in grams (g)  
G0 – the nominal net weight of the roll, in grams (g)  DUS  1671: 2016  
© UNBS 2016  – All rights reserved  7 
 ΔG – the roll net weight (mass) deviatio n, percentage (%)  
6.3 Appearance test  
The appearance indexes for air bubbles, perforations, ruptures and unevenness shall be determined by 
performing a visual inspection under natural light.  
The sizes of the impurities, fish eyes and lump blocks shall be determined with a tenfold magnifier, using the 
maximum length to calculate. The dispersion shall be determined with a frame -board of 10 cm x 10 cm.  
6.4 Physical and mechanical properties  
6.4.1 Tensile strength and nominal tensile strain at break  
The dete rmination shall be conducted in accordance with ISO 527 -3. Two samples with a width of 10 mm and 
a gauge length of 50 mm shall be used. The test speed (no -load) is 500 mm/min  ± 50 mm/min  
6.4.2 Right angle tear strength  
The determination of right angl e tear strength shall be conducted in accordance with the provisions set out in 
ISO 6383 -1.  
6.5 Deviation of gas transmission rate  
The determin ation of gas transmission rate shall be conducted in accordance with the provisions set out in 
ISO 15105 -1:2007 . The deviation of the gas transmission rate shall be determined by formula (4):  
100
00YYY
Y
                                        4) 
in which,  
Y – the actual measured oxygen transmission rate, in cubic centimetres /(m2 24h atmospheric pressure) 
(cm3/(m2 24 h atm))   
Y0 – the nominal oxygen transmission rate, in cubic centimetres /(m2 24h atmospheric pressure) (cm3/(m2 24 h 
atm))  
ΔY – the deviation of the oxygen transmission rate, percentage (%)  
The deviation of the carbon dioxide transmission rate shall be determined by formula (5):  
100
00RRR
R
                                             5) 
in which,  
R – The actual mea sured carbon dioxide transmission rate, in cubic centimetres/(m2·24 hours atmospheric 
pressure) (cm3/(m2·24h·atm))  
R0 – The nominal carbon dioxide transmission rate, in cubic centimetres/(m2·24 hours atmospheric pressure) 
(cm3/(m2·24h·atm))  
ΔR– The deviati on of the carbon dioxide transmission rate, percentage (%)   
8 © UNBS 2016  – All rights reserved  
 6.6 Deviation of water vapour permeance  
The determination of the water vapour permeance shall be conducted in accordance with the provisions set 
out in ISO 2528:1995 , the deviation of the water va pour permeance shall be determined by formula (6):  
100
00HHH
H
                                     6) 
in which,  
H – The actual measured water vapour permeance, in grams/ (m2·24 hours) (g/(m2·24h))  
H0 – The nominal water vapour permeance in gra ms/ (m2·24 hours) (g/ (m2·24h))  
ΔH– The deviation of the water vapour permeance, percentage (%)  
6.7 Light transmissivity and haze  
The determination of light transmissivity and haze shall be conducted in accordance with the provisions set 
out in ISO 14782 . 
6.8 Self-cling (shear and peel strength)  
6.8.1 Sample preparation  
Cut 10 sheets of sample 50 mm long and 25 mm wide, with every two sheets forming a set. Place the 
adhesive sides of each set of samples face to face in a lap joint, the length of the  lap joint being 15 mm and 
the width of the lap joint being 25 mm. Lay the samples on a smooth surface, use a rubber roller (diameter of 
40 mm, length of 100 mm, mass of 300 g) and carry out reciprocation rolling and press on the lap joint three 
times, unt il there is no air left between the lap -jointed layers of cling wrap film. Leave the prepared samples in 
an environment under test conditions for 20 minutes and then conduct the test.  
6.8.2 Test method  
Stretch out each set of the samples on a tension mach ine and determine the force needed to separate the two 
sheets of sample. The arithmetic mean value of the five sets shall be regarded as the result. The test 
instrument shall meet the provisions set out in ISO 527 -3:1995 and the stretching velocity is 250 ± 50 mm/min. 
The self -cling (shear and peel strength) shall be determined by formula (7):  
baPT
                                            7) 
in which,  
T – The self -cling (shear and peel strength), in Newton/ square centimetre s (N/cm2) 
P – The force needed to separate the sample, in Newtons (N)  
b – The width of the lap joint, in centimetres (cm)  
a – The length of the lap joint, in centimetres (cm)  DUS  1671: 2016  
© UNBS 2016  – All rights reserved  9 
 6.9 Determination of the open - wrapping  
6.9.1 Sample preparation  
Cut 6 sheets of sample 150  mm long and 50 mm wide, with every two sheets forming a set. Place the 
adhesive sides of each set of samples face to face in a lap joint, the length of the lap joint being 100 mm. The 
processing and treatment methods are the same as specified in Section 6 .9.1 [sic] of this Standard.  
6.9.2 Test method  
Fix one end of the sample and at the other end of the sample fix a 4 g weight using the self -cling of the cling 
wrap film or a piece of adhesive paper. Let the weight down slowly and allow the sample to peel naturally. See 
Diagram 1 for the test schematic. All three sample sets should meet the property requirements.  
 
Figure 1 — Test schematic  
7.10 Determination of the anti - fogging  
Add 200 ml of water at a temperature of 23 oC± 2 oC into each of three beakers with a volume of 1000 ml. Use 
three equal -sized pieces of cling wrap film, with the adhesive side facing down, to completely cover each of 
the beaker mouths. Ensure the film surfaces are flat, and put the three beakers into a low  temperature tank at 
3oC to maintain a constant temperature. After 10 minutes, check the adhesive state of the water drops on the 
surface of the cling wrap film. All three samples should meet the property requirements.  
7 Inspection rules  
7.1 Group lot  
The acceptance check for the products shall use the lot as the unit. Products which are made of the same 
grade material have the same specifications, the same formula and have been continuously produced. One lot 
shall not exceed 10,000 rolls .  
10 © UNBS 2016  – All rights reserved  
 7.2 Inspection  classification  
7.2.1 Factory inspection  
The factory inspection items are appearance, dimensional specification, tensile strength, nominal tensile strain 
at break and self -cling.  
7.2.2 Type inspection  
The type inspection items are all the items specified  in the technical requirements. Type inspections must be 
conducted at least once a year.  
7.3 Sampling plan  
7.3.1 Dimensional deviation, appearance  
Adopt the normal double sampling plan specified in ISO 2859 -5. The Inspection Level (IL) shall be the general 
inspection level II, the Acceptance Quality Limit (AQL) shall be 7.5, see Table 6 for detailed samples and 
decision arrays. Each roll is regarded as one sample unit.  DUS  1671: 2016  
© UNBS 2016  – All rights reserved  11 
 Table 6 — Sampling number and decision method  
Lot size  Sample  Sample size  Cumulative 
sample size  Acceptance 
number (Ac)  Rejection 
number (Re)  
26-50 First sample  
Second sample  5 
5 5 
10 0 
1 2 
2 
51-90 First sample  
Second sample  8 
8 8 
16 0 
3 3 
4 
91-150 First sample  
Second sample  13 
13 13 
26 1 
4 3 
5 
151-280 First sample  
Second sample  20 
20 20 
40 2 
6 5 
7 
281-500 First sample  
Second sample  32 
32 32 
64 3 
9 6 
10 
501-1200  First sample  
Second sample  50 
50 50 
100 5 
12 9 
13 
1201 -3200  First sample  
Second sample  80 
80 80 
160 7 
18 11 
19 
≥3201  First sample  
Second sample  125 
125 125 
250 11 
26 16 
27 
 
8.3.2  Physical and mechanical properties  
Take any roll from the extracted samples to carry out the inspection.  
8.3.3  Hygienic properties  
Take any roll from the extracted samples to carry out the inspection.  
8.4 Determination r ules 
8.4.1  Determination for conforming items  
The determination of the appearance and dimensional deviation for the sample unit shall be conducted in 
accordance with Section 5.3, 5.4 respectively. If the inspection results of the sample unit meet the 
speci fications prescribed in Table 1, then the appearance and the dimensional deviation shall be determined 
as conforming items.  
The determination of the appearance and dimensional deviation for the sample unit shall be conducted in 
accordance with Section 5.3,  5.4 respectively. If the inspection results of the sample unit meet the 
specifications prescribed in Table 1, then the appearance and the dimensional deviation shall be determined 
as conforming items.  
When there is any nonconforming item existing in the h ygienic properties, then the hygienic properties shall be 
determined as nonconforming.   
12 © UNBS 2016  – All rights reserved  
 7.4.2 Determination for conforming lots  
When all of the inspection results for appearance, dimensional deviation, physical and mechanical properties 
and hygienic proper ties conform, then the lot can be regarded as a conforming lot.  
8 Packaging labels, packaging, transport and storage  
Marking  
Cling wrap film shall be permanently marked with the following  product material markings : 
a) indication of the source of man ufacture and trade -mark, if any;  
b) recycling symbol ; 
c) packing slip in each package shall be marked with the following:  
1) nominal capacity and  
2) batch number or code number  
d) the containers may also be marked with the standard mark.  
 
For the mass content of any additive whic h exceeds 1%, the specific name or the chemical structural of the 
additive must be indicated.  
The nominal values of the oxygen transmission rate (unit is cm3/ (m2·24h·atm)), the carbon dioxide 
transmission rate (unit is cm3/ (m2·24h·atm)) and the water vap our permeance (unit is g/(m2·24h)) of a cling 
wrap film should be indicated.  
The nominal value of the roll net weight of a cling wrap film should be indicated.  
Cling wrap film should be marked with the words “for food use”.  
Polyvinylchloride cling wrap fil m should be marked with warnings such as “Must not come into contact with 
food containing fats”, “Not suitable for microwave heating”, or “Must not be used at high temperatures”  
For cling wrap film that can be microwave -heated, the cling wrap film should b e marked with the words 
“Microwave oven safe”, the heating methods and the maximum safe temperature.  
Marking methods can be printing, etc. The mark can be made on the outer packaging of the product or on the 
product itself.  
 
8.1 Packaging labels  
The packa ging box (bag) shall be marked with the following information:  
a) product name;  
b) product quantity  and dimensions ; 
c) name  and physical address  of the manufacturer;  DUS  1671: 2016  
© UNBS 2016  – All rights reserved  13 
 d) production date and expiry date;  
e) product material  type; 
f) the specific name and chemical structure of each additive;  
g) the nominal values of the oxygen transmission rate, carbon dioxide transmission rate and water 
vapour transmission rate;  
h) the nominal value of the roll net weight;  
i) the words “for food use”;  
j) warnings or  other explanations ; 
8.2 Packaging  
8.2.1 Inner packaging  
Use film bags or racked boxes as sealed packaging.  
8.2.2 0ther packaging  
Cardboard boxes or other suitable packaging shall be selected for the outer packaging of the products.  
8.3 Transport  
During the transportation of the product, attention must be paid to damp -proofing and protection from sunlight. 
During handling, the product must be carefully lifted up and put down and have no heavy loads placed on  top 
of it. 
8.4 Storage  
The product must  be stored in clean, dry warehouses, must not come into contact with any corrosive chemical 
substances and other harmful substances, the distance from any heat source shall be at least one metre and 
the reasonable storage duration shall be determined on th e basis of the properties of the plastic cling wrap 
film. The storage duration must not exceed two years from the production date  
  
14 © UNBS 2016  – All rights reserved  
 Bibliography  
[1] GB 10457 -2008 , Plastic Cling Wrap film for keeping food fresh  
 DUS  1671: 2016  
© UNBS 2016  – All rights reserved  15 
 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 Mark 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 Standard. The 
presence of this mark on a product or in relation to a product is an assurance tha t 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 f or 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  1671 : 2016    
 
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