MEDC 02 (353) CD1  
Rev. TZS 684:2002   
1 
           
 
 
 
DRAFT TANZANIA STANDARD  
Wrought aluminium and aluminium alloys for manufacture of 
cookware  – Sheets, strips and plates – Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
©TBS 2020                                                                                                                                      2nd Edition  
MEDC 02 (353) CD1  
 
(Rev. TZS 684:2002 ) 
2 
 This Draft Tanzania Standard  will be  published under the authority of the Board of Directors  of Tanzania 
Bureau of Standards .  
 
 
The Tanzania Bureau of Standards (TBS) is the statutory nat ional standards body for Tanzania 
established under the Standards Act No. 3 of 1975, amended by Act No. 1 of 1977 and revised by 
Standards Act No. 02 of 2009.  
 
 
The Mechanical Engineering Divisional Standards Committee (MEDC) under whose supervision, this  
Tanzania Standard was prepared, consists of representatives from the following organizations:  
 
 
*University of Dar es Salaam, College of Engineering and Technology  
*National Development Corporation (NDC)  
Weights and Measures Agency (WMA)  
Tanzania Indus trial Research Development Organization (TIRDO)  
*Aluminium Africa  
National Institute of Transport (NIT)  
Ministry of Works  
 
 
The organizations marked with an asterisk (*) in the above list, together with the following, were directly 
represented on the Te chnical Committee entrusted with the preparation of this Tanzania Standard:  
 
 
Tanzania Automotive Technology Centre (TATC)   
National Development Corporation (NDC)  
M.M. Investiment Steel Mills Limited  
Trans Auto Parts Company Limited ( TAPCO )  
Dar Es Sal aam Institute of Technology (DIT)  
 
 
 
 
Tanzania Bureau of Standards  
P O Box 9524  
Dar es Salaam  
Phone: 022 2450206/2450949/2450298  
Fax: 022 2450959  
Email: info@tbs.go.tz   
 
 
 
 
ISBN 9976 -64-663-1 
 
 
 
 
 MEDC 02 (353) CD1  
 
(Rev. TZS 684:2002 ) 
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 0 Foreword  
This Tanzania Standard has been prepared by Metals and Structures Technical Committee (MEDC 02) 
under the supervision of Mechanical Engineering Standards Divisional Committee (MEDC).  
The main objective of this Tanzania Standard is to protect the consumer with regards to health  and safety 
of household cooking utensils.  
In the preparation of this Tanzania Standard, assistance was drawn from the following publications:   
BS EN 573 -3:2019 , Aluminium and aluminium alloys – Chemical composition and form of wrought 
products – Part 3: Chemical composition . 
BS EN 602: 2004 , Aluminium and aluminium alloys  - Wrought products - Chemica l composition of semi 
products used for the fabrication of articles for use in contact with food .  
BS EN 485 -2:2016+A1:2018 , Aluminium and alumi nium alloys. Sheet, strip and plate  -Part 2:  Mechanical 
properties . 
DIN EN 515: 2017 , Aluminium and aluminium alloys  – Wrought products – Temper designations .  
IS 737: 2008 (Reaffirmed 2018) , Wrought Aluminium and Aluminium Alloy Sheet and Strip for General  
Engineering Purposes - Specification  
IS 21:1992 (Reaffirmed 2017) , Wrought Aluminium and Aluminium Alloys for Manufacture of Utensils – 
Specification  
IS 50 52:1993  (Reaffirmed 2003) , Aluminium and its alloys - Temper designations  
 
 
This second edition canc els and repla ces the first edition TZS 684 :2002  which is technically revised.  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 MEDC 02 (353) CD1  
 
(Rev. TZS 684:2002 ) 
4 
 Wrought Aluminium and Aluminium Alloys for Manufacture of 
Utensils – Sheets, Strips and Plates – Specification  
 
1 Scope  
This Tanzania Standard spec ifies requirements for wrought aluminium and aluminium alloys sheets, strips 
and plates for the manufacture of cooking utensils used for catering and domestic purposes.  
 
 
2 References  
For the purpose of the Tanzania Standard, the following references sha ll apply:  
 
TZS 4: 1979, Rounding off numerical values.  
 
TZS 642: 2000, Metallic materials – Tensile strength test.  
 
 
3 Terminology  
For the purpose of this Tanzania Standard the following definitions shall apply:  
 
3.1 P late  
A rolled product rectangular  in cross section and form, over 6 mm in thickness with either sheared or 
sawed edges, supplied flat and with less control of surface finish than applies to sheet. The plate may be 
hot-rolled or cold -rolled.  
 
3.2 Sheet  
A rolled product rectangular in cros s section and form, over 0.2 mm in thickness but not exceeding 6 mm 
thickness and supplied flat. The sheet may be hot – rolled or cold – rolled.  
 
3.3 Strip  
A cold -rolled product of rectangular cross section and form over 0.2 mm in thickness but not exceed ing 3 
mm thickness and supplied in coil. The strip shall be cold – rolled.  
 
 
4 Material requirements  
4.1 Wrought aluminium or aluminium alloys  used for the manufacture of utens ils shall comply  with the 
requirements of one of the following  aluminium grades : 19000, 19 500, 19600, 31000, 31500, 40800,  
51000 -A, 51000 -B and 64430  specified in Table  1 and Table 2 . 
 
4.2 The chemical composition and mechanical properties of the grades referred in 4.1 shall comply with 
the requirements  in Tables 1  and Table 2 respec tively.  In addition, the lead content of the material  shall 
not exceed 0.05 percent.   
 
4.3 Condition   
4.3.1  The material shall be supplied in the condition as specified by the purchaser. W hile specifying the 
condition, the temper designation as laid down i n Annex C  shall be followed .  
 
4.3.2  The temper designations are  based on the sequence of basic treatments used to produce the 
tempers. Basic temper designations consist  of letters. If subdivisions of basic tempers are required, they 
are indicated by a dig it, following the letter of the basic temper. Only those treatments or operations which 
significantly influence the product characteristics are recognized  
 
 
 
 
 MEDC 02 (353) CD1  
 
(Rev. TZS 684:2002 ) 
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 Table 1: Chemical Composition of Wrought Aluminium and Aluminium Alloys for Manufacture of  Uten sils 
(Composition limits are in percent maximum unless shown otherwise)  
 
 
 
 
 
 
 
 Designation  Aluminium  Copper  Magnesi
um  Silicon  Iron Mangan
ese Zinc Titanium  
and/or 
Other  
Grain 
Refining  
Elements  Cromium  Remarks  
19000  99.0, Min  0.1 0.2 0.5 0.7 0.1 0.1 — — Cu+Mg+S i+Fe+Mn+
Zn = 1.0  
19500  99.5, Min  0.05  — 0.3 0.4 0.05  0.05  — — Cu+Si+Fe+Mn+Zn = 
0.5 
19600  99.6, Min  0.05  — 0.25  0.35  0.03  0.06  — — Cu+Si+Fe+Mn+Zn =  
0.4 
31000  Remainder  0.1 0.1 0.6 0.7 0.8 - 1.5 0.2 0.2 0.2 — 
31500  Remainder  0.2 0.6 - 1.3 0.4 0.7 1.0 - 1.5 0.2 0.2 — — 
40800  98.0, Min  0.2 0.1 0.6 - 0.95  0.6 - 0.95  0.1 0.2 0.2 — — 
51000 -A Remainder  0.2 0.5 - 1.1 0.6 0.7 0.2 0.25  — 0.1 — 
51000 -B Remainder  0.2 1.1 - 1.8 0.6 0.7 0.2 0.25  — 0.1 — 
64430  Remainder  0.1 0.4 - 1.2 0.6 - 1.3 0.6 0.4 - 1.0 0.1 0.2 0.25  — 
 
NOTES  
1. The lead content of the material shall not exceed 0.05%.  
2. Other elements not specified in the chemical composition, the maximum content for each  shall not exceed 0.05% because of insufficient 
knowledge about behavior in contact with food. H igher limits may be introduced when more information is available.  
3. It is the responsibility of the supplier to ensure that any element not specifically limited, is not present in any amount such as is generally 
accepted as having an adverse effect on the p roduct. If a  purchaser's requirements necessitate limits for any element not specified, it 
should be agreed between the purchaser and the supplier.  
 MEDC 02 (353) CD1  
 
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6 
 Table 2: Mechanical Properties of Wrought Aluminium and Aluminium Alloy Sheet a nd Strip for Manu facture of Utensils  
 
 
 
 
Designation  Condition  0.2 Proof 
stress MPa Tensile 
Strength, MPa Elongation on 50 mm Gauge Length , Percent , 
 
For Thickness in mm  Bend 
Test, 
Radius of  
Bend  Min Min Max 0.5 ≤ t ≤ 0.8  0.8 < t ≤ 1.3  1.3 < t ≤ 2.6  2.6 < t ≤ 6.3  
1900 0 O 
Hx2 
Hx4 
Hx6 
Hx8 — 
— 
— 
— 
— 70 
90 
105 
125 
140 110 
130 
140 
150 
— 20 
5 
3 
2 
2 25 
6 
4 
3 
2 29 
8 
5 
4 
3 30 
8 
5 
4 
3 Close  
Close  
1/2t 
1/2t 
1t 
19500  O 
Hx4 
Hx8 — 
— 
— 55 
100 
125 95 
135 
— 22 
4 
3 25 
5 
3 29 
6 
4 30 
6 
4 Close  
1/2t 
1t 
19600  O 
Hx4 
Hx8 — 
— 
— — 
95 
125 95 
125 
— 25 
4 
3 25 
5 
3 29 
6 
4 32 
6 
4 Close  
1/2t 
1t 
31000  O 
Hx2 
Hx4 
Hx6 
Hx8 — 
— 
— 
— 
— 90 
115 
130 
150 
170 130 
150 
180 
195 
— 20 
5 
3 
2 
2 23 
6 
4 
3 
2 24 
7 
5 
4 
3 24 
8 
5                  
4                      
3 Close  
Close  
1/2t 
1t 
3t 
31500  O 
Hx2 
Hx4 
Hx6 
Hx8 — 
— 
— 
— 
— 125 
150 
190 
215 
245 165 
210 
245 
275 
— 16 
5 
3 
2 
1 16 
5 
4                       
2 
1 18 
6 
5 
3 
1 20 
8 
5 
4 
2 Close  
Close           
1/2t               
1/2t 
1t 
40800  O 
Hx2 
Hx4 
Hx6 
Hx8 — 
— 
— 
— 
— 85 
105 
125 
150 
175 120 
140 
160 
180 
— 20 
5 
3 
2 
2 23 
6 
4 
3 
2 25 
7 
5 
4 
3 30 
8 
5 
4 
3 Close  
Close  
1/2t 
 1t                
3t 
51000 -A O 
Hx2 
Hx4 
Hx6 
Hx8 — 
85 
105 
125 
— 105 
120 
140 
160 
185 150 
160 
180 
200 
— 18 
3 
2 
1 
1 18 
4 
3 
2 
2 18 
5 
4 
2 
2 22 
6 
4 
2 
2 Close  
Close  
1/2t               
1t                
3t MEDC 02 (353) CD1  
 
(Rev. TZS 684:2002 ) 
7 
 51000 -B O 
Hx2 
Hx4 
Hx6 
Hx8 — 
110 
140 
155 
— 125 
155 
175 
190 
200 170 
195 
 215 
 225 
 — 18 
3 
2 
1 
1 18 
4 
3 
2 
2 18 
5 
4 
2 
2 19 
6 
4 
2 
2 Close              
1/2t                
1t                
3t 
— 
64430  O 
T4 
T6 — 
115 
250 — 
200 
295 175 
— 
— 14 
12 
5 16 
15 
5 16 
15 
5 17 
15 
6 Close  
2t 
3t 
 
NOTES 
1. 1MPa = 1 N/mm2 = 1 MN/m2 = 0.102 kgf/mm2 = 144.4 psi.  
2. t is the thickness of the test piece.  
3. For thickness 2.6 mm and less, elongation values are for guidance only and not guaranteed. For this purpose bend test as spec ified in 7.2 
may be carried out.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 MEDC 02 (353) CD1  
 
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 5 Freedom from defects  
The manufacturing process shall leave the material smooth, free from tool marks or splits and flow lines.  
 
6 Dimensions  
6.1 Thickness tolerances  for hot -rolled plate and sheet  shall not vary by more than t he respective 
permissible tolerances prescribed in table 3 .  
 
6.2 Thickness tolerances for cold -rolled plate, sheet and strip shall not vary by more than the respective 
permissible tolerances prescribed in table 4 . 
 
Table 3 : Thickness tolerances for hot - rolled plate and sheet  
 
Thickness, 
mm Width w, mm  
≤1250  1250<w≤1 750 
 1750 <w≤
2000 
 2000<w≤3000  
 2500<w≤3 000 
 3000<w≤3500  
Tolerance  in ± mm  
3 - 4 0.23  0.30  0.35  0.45  0.55  - 
5 0.25  0.38  0.40  0.50  0.63  - 
6 0.28  0.38  0.43  0.50  0.63  0.78  
 
 
Table 4 : Thick ness tolerances for cold - rolled plate and sheet  
 
Thickness, 
mm Width w, mm  
≤500  500<w≤
1000 
 1000 <w≤
1250 
 1250 <w≤
1500  
 1500 <w≤1750 
 1750 <w≤ 
2000  2000 <w≤25 00 
Tolerance  in ± mm  
1.6 0.08  0.09  0.10  0.15  0.18  0.21  - 
1.8 0.09  0.10  0.12  0.16  0.20  0.23  - 
2.0 0.10  0.11  0.13  0.16  0.20  0.24  - 
2.5 0.11  0.12  0.14  0.17  0.22  0.26  - 
3.0 0.11  0.13  0.15  0.18  0.24  0.28  - 
4.0 0.13  0.15  0.18  0.21  0.25  0.30  0.38  
5.0 0.14  0.17  0.20  0.23  0.27  0.40  0.47  
6.0 0.15  0.19  0.23  0.25  0.29  0.44  0.46  
 
 
7 Tests  
7.1 Tensile tes t:  
The tensile test shall be done in accordance with TZS 642 . The test piece shall be taken in the long 
transverse direction for material of 300 mm wide and over and in longitudinal direction for material under 
300 mm wide.  
 
The results obtained shall co mply with the requirements spec ified in tables 2 .  
 
7.2 Bend test  
Unless otherwise stated, the bend test piece shall be  not less than 15 mm wide, of convenient length. and  
cut with its longer axis transverse to the direction of rolling. The longer edges sh all be carefully rounded 
and smoothened longitudinally so that the cross -section of the test piece has approximately semi -circular 
ends.  MEDC 02 (353) CD1  
 
(Rev. TZS 684:2002 ) 
9 
 7.2.1  The test piece may be bent by hand to a U -form, and the piece thus obtained shall subsequently be 
closed in a vic e until the inner surfaces of the test piece are twice the specified radius apart ( in Table 2 ). 
7.2.2  When tested in accordance with 7.2.1 , the outer surface of the bend shall not show any visible 
crack . 
 
 
8 Re-Tests  
8.1 If a t est does not give the specifi ed results, two additional samples from the same batch shall be 
selected for testing, one of which shall be from the sheet or strip from which the original test sample was 
taken, unless that sheet or strip has been withdrawn by the supplier. Both retests s hall conform to the 
requirements of this standard; otherwise, the lot shall be rejected.  
 
8.2 Unless otherwise agreed, the supplier shall have the discretion to re -heat treat the material (heat -
treatable alloys), not exceeding 2 re -heat treatments, before the two further samples are selected.  
8.2.1 If a test does not give the specified results, two additional samples from the same batch shall be 
selected for testing. Both retests shall conform to the requirements of this standard, otherwise, the lot 
shall b e rejected.  
 
 
9 Selection o f Test Samples  
9.1 Sheet and Strip of Aluminium or Non -Heat Treatable Aluminium Alloy  
Material of the same thickness, produced in the same way, and of the same nominal composition shall be 
grouped into batches of not more than 4 000 kg. However, if a sheet or strip in a single coil exceeds  4000 
kg in weight, it shall be  deemed to represent one batch.  
9.1.1 Mechanical tests shall be carried on to each batch for determining conformity of  the material to this 
standard.  
9.1.2 Before th e test samples are cut off, they shall be marked to identify them with the batch they 
represent. The test sample shall be taken from the material as supplied and shall not be further annealed 
or mechanically worked. The test samples may be cut and prepared  from the margins of the material 
before cutting it to size.  
 
9.2 Sheet and Strip of Heat -Treatable Aluminium Alloys  
One test sample shall be cut from a sheet or strip selected from each heat treatment batch. Before the 
test samples arc cut off, they shall  be marked to identify with the heat treatment batch they represent.  
9.2.1 Unless otherwise agreed, the test samples shall be tested in the O, T4 or T6 conditions (that is in 
the same condition in which the material is to be supplied). The test sample, aft er heat treatment, shall 
not be mechanically worked before being tested.  
9.2.2 Material in the ' O' condition, when heat -treated, may have properties of the order of 15 MPa less 
than the specified properties for the T4 or T6 conditions as appropriate.  
9.2.2.1 Unless otherwise agreed, the tests shall be carried out either in T4 or in T6 condition. The test 
samples shall not be further heat -trealed or mechanically worked (except for making the test piece) 
before being tested. The test samples may be cut from t he margins of the material before cutting it to 
size. 
 
10 Marking  
Each package/coil of sheet(s) and strip(s) may be suitably marked for identification, with the following 
particulars:  
a) name of the manufacturer  and/or trade mark,  
b) grade /designation ,  
c) condit ion of the material and  
d) batch number.  
 
 
 
 
 MEDC 02 (353) CD1  
 
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 ANNEX A  
 
 
COMPARISON OF ISO AND IS DESIGNATIONS  
 
ISO Designation  IS Designation  
1200  19000  
1050  19500  
1060  19600  
3103  31000  
3004  31500  
8011  40800  
5005  51000A  
5050  51000B  
6531  64430  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 MEDC 02 (353) CD1  
 
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 ANNEX B  
 
CHARACTERISTICS AND TYPICAL USES OF  ALUMINIUM AND ALUMINIUM  ALLOYS  
 
Designation  Characteristics  Available Forms  Typical Uses  
19000  Commercially pure 
aluminium. Very ductile  in 
annealed or extruded 
condition. Excellent 
resistant  to corrosion . 
  Sheet, plate, 
extrusion, tube, 
wire and forgings  Paneling and moulding; 
refrigeration tubing equipment 
for chemical, food  and brewing 
industries; packaging; cooking  
utensils. Sheet metal  work, 
architectural and builder's 
hardware, spun/pre ssed 
hollowware, deep drawn parts,   
cladding  welding  wire and 
electrical appliances.  
19600 and 19500  High  purity resistant to 
other grades  Sheet,  plate, 
extrusion, wire, 
rolled and forging  Corrosion resistant cladding on 
stronger alloys, impact extruded  
container; food, chemical 
brewing and processing 
equipment , tanks  and pipes, 
marine fittings, reflectors, 
pressed  and  anodized utility  
items, jewelry , cable    
sheathing, pre-sensitized plates 
and cable wrap   
31000  Stronger and harder than 
19000 but has good 
workability, weldability and 
corrosion resistance  
   Sheet,  plate, 
extrusion, wire, 
tube and forgings  General  purpose alloy for 
moderate strength applications, 
pressure vessels, irrigation 
tubing, heat exchangers, 
utensils  and presser cookers,  
roofing sheets, p ilfer proof and 
detonator caps, air-cond itioning 
ducting fan blades and vehicle 
paneling . 
   
31500 Strength between 31000 
and 52000. It has good 
formability, weldability 
corrosion resistance  Sheet and strip  General  purpo se sheet, roofing 
and siding,  utensil s, sheet metal  
work, vehicle paneling. 
Pressure vessels and lamp 
caps . 
  
40800  Strength comparable to 
alloy 31000 and ductililty 
comparable to alloy 19000.  
This alloy is fine grained 
and has excellent 
drawability  Sheet, strip and 
plate    Vehicle paneling, fan blades 
and other applica tions same as 
of alloys  19000 and 31000 
except those for  bright 
anodizing purposes, utensils 
hollowware containers, closures 
and cable wrap . 
 
51000A  Stronger than alloy 31000, 
and has excellent finishing 
charact eristics.  It can be 
readily   shaped  by pressing  
and forming  
   Sheet, strip and 
plate  Applian ces and utensils, 
architectural trims, consumer  
durables with attractive 
anodized finishes . MEDC 02 (353) CD1  
 
(Rev. TZS 684:2002 ) 
12 
 51000B  Strength greater than 
51000 A Sheet, strip and 
plate    Architect ural appli cations; high 
anodizing  quality 
kitchenware  and cooking  
utensils, consumer durables; 
bathroom fittings, auto rim, air 
conditioner and TV housing; 
chemical equipment, marine 
applications and refrigerator 
item. 
64430  A medium strength alloy 
with good mechanical 
properties,  Corrosion 
resistance and weldability.
  Sheet, plate, 
extrusion, tube,  
wire and forgings  Structura l application of all  
kinds, su ch   as   road   and   
rail transport vehicles,  bridges, 
cranes, roof trusses, rivets,  etc.  
Cargo containers, milk 
containers and flooring . 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 MEDC 02 (353) CD1  
 
(Rev. TZS 684:2002 ) 
13 
 ANNEX C  
 
TEMPERS DESIGNATION  
 
COMPARISON  OF IS TEMPERS WITH  ISO TEMPERS   
 
OLD IS TEMPERS  NEW IS TEMPERS  ISO TEMPERS  
— M M 
M F F 
O O O 
H H H 
H1 H X 2 H X B  
H2 H X 4  H X D 
H3 H X 6  H X F 
H4 H X 8  H X H 
— T1 TA 
— T2 TC 
WD T3 TD 
W T4 TB 
P T5 TE 
WP T6 TF 
WS T7 TM 
WDP  T8 TH 
WPD  T9 TL 
— T10 TG 
PD — — 
WR — — 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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