DRAFT TANZANIA STANDARD  
      MEDC2 (5001) P3  – INDUSTRIAL WIRE CLOTH FOR GENERAL PURPOSES  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
©TBS 2017                                                                                                                        First  Edition  
 
 SPECIFICATION FOR WIRE CLOTH FOR GENERAL PURPOSES  
 
1. SCOPE  
1.1This  standard  lays down  the minimum  requirements  of material, dimensions  and 
construction  of woven  wire cloth  used for general  purposes.  
1.2 This standard  does not cover wire  cloth  used for  test sieves  
 
2. TERMINOLOGY  
2.0 For the  purpose  of this  standard, the  following  definitions  shall  apply . 
2.1 Woven  Wire  Cloth   
 A cloth  produced  by weaving  wires to form  uniform  square  apertures  (see Note  under  
4.1) 
2.2 Aperture  Size-The width  of the clear space  between  successive  wires  measured  at 
the centre  line of the aperture.  
 
3. WIRE  
3.1 The wire used in  the manufacture  of the cloth  shall  be well and cleanly  drawn  free 
from  scale,  inequalities , splits,  etc, of circular  cross -section  and of uniform  ductility  
throughout  to avoid  hard lumps  or soft spots in  the finished  cloth . 
 
3.2 Material of wire  – The wire used in the manufacture  of the cloth  shall be of brass,  
bronze,  mild  steel,  aluminium  alloy  or plastics.  Specifica tions for the material  and protective  
covering  on the wire,  if any, will be agreed  upon  between  the purchaser  and the 
manufacturer . 
3.3 Diameter  of Wire  –The recommended  diameters  of wire for each aperture size is  
given  in TableI  
 
NOTE –Deviations  in the diameter  of wire may be permitted  by mutu al agreement  between the 
purchaser  and the manufacturer  provided  the diameter so selected Call in the R40 series  of preferred  
numbers in IS: l016.1967t . 
 
 
 
 
 
 
 
 
 
 
TABLE 1 DIMENSIONS OF WIRE CLOTH FOR GENERAL PURPOSES (Claus es 3.3, 5. 1, 5.2, 
2.1, 5.2 .2.2, A-1.2and A-2.1) 
AVERAGE WIDTH 
OF APARTURE  MAXIMUM 
PERMISSIBLE 
VARIATION IN MAXIMUM 
PERMISSIBLE 
VARIATION IN NOMINAL 
DIAMETER OF 
WIRE SIZE   
 AVERAGE 
APERTURE S IZE INDIVIDUAL 
APERTURE S IZE 
1.70mm  
1.40mm  
1.18mm  
1.00mm  Percent  
 
±10 Percent  
 
+20 mm 
0.32,0.4,0. 56,0·8  
0.25,0.32,0.45,0.63,0. 71 
0.25,0. 32. 0.41, 
0.45,0.56,0. 63, 
0.22, 0.28, 0.36,0.5 
,0.56 
 
850 microns  
710 microns  
600 microns  
500 microns  
425 microns  ±10 +30 0.2, 0. 25, 0.32, 0.45, 
0.50, 0· 56 , 0.18, 0.25, 
0.32,0·45 , 0.16, 
0.22,0.28,0. 4 
0.14,0.2,0.25,0.32,0. 36 
0.14,0. 2, 0.25 ,0·28  
 
355 microns  
300 microns  
250 microns  
212 microns  
180 microns  
150 microns  ±15 +40 0.125, 0·18, 0·22,  0.25 
0.112,0. 16, 0.1 
0.14, 0. 16, 0.2, 0.1,  
0.125, 0.14,0. 16, 0.18 
0.08,0. 112, 0.125, 0·14,  
0.071,0.1,0. 112,0.125  
 
 
4. CONSTRUCTION  
 
4. The cloth  hall be regularly  woven  with a number  of equally  spaced  parallel  wires  in both 
warp  and weft directions  to produce  uniform  square  meshes  or openings  (see Note).  The wire 
cloth  shall  be properly  salvaged  by one or more  wires  in each edge.  
 
NOTE -Rectangular  apertures  may also be used for which the  user win separately  specify the 
dimensions  and tolerances . 
 
4.2 Crimping  of wires  may be done, where  necessary, to  facilitate  construc tion and to 
minimize  distortion  of apertures . 
 
5. DIMENSIONS A.ND  TOLERANCES  
5.1 Dimensions  – The dimensions  of wire cloth  shall  be in accordance  with Table1  
 
5.1.1The  length  of the wire cloth  shall  be 15m or 30m and the width  300mm,  
450mm,  600mm,  900mm  or 1200mm.The  length  and the width  shall be specified  by the 
purchaser . 
 
5.2 Toleran ce. 
5.2.1 Tolerance  on Width  of the Cloth -A tolerance  o: I:5 mm shall  be allowed on  the 
width  of the  cloth  as specified  in 5.1. 
 
5.2.2  Tolera nce on Width of Aperture  
  
 5.2.2.1 Tolerance on average  aperture -The average  of the width of all measured  
apertures  (see Appendix  A) shall not depart  from the  nominal  aperture  by more  than 
appropriate  tolerances  specified in  Table1.  
 
5.2.2.2 Maximum tolerance -No individual  aperture  shall  exceed  the nominal  aperture  by 
more  than the appropriate  tolerances  specified in  Table 1. 
 
 
6. DESIGNATION  
6.1The  wire cloth  shall  be designated  by its nominal  aperture  width  and diameter  of the 
wire in  rnillimetres  or microns  as the case  may be followed  by the material  of the wire  
and the inscription    (wire cloth ) 
 
Example:  
a) 1·40 X 0.710 mm mild steel wire cloth  
b) 600 X400 microns  phosphor  bronze  wire cloth  
 
 
7. SAMPLING AND INSPECTION  
7.1 One roll from  every  five rolls of  wire cloth  delivered  shall be  taken  at random  and a 
sample  with a minimum  length  of 600mm  shall  be cut from  the entire  width  of the roll for  
inspection  and test. 
 
7.2 The wire cloth  selected  in accordance  with 7.1 shall  be inspected  and tested for  the 
requirements  laid down  in this  standard.  
 
8. REJECTION  
8.1 If any sample  fails to  comply  with the test the  whole  lot represented  by such a sample  
shall be rejected.  
 
9. PACKING  
9.1The wire cloth shall  be wrapped  in kraft paper  and thereafter  packed  as desired  by the 
purchaser.  
 
10. MARKING  
10.1 Each package  shall be clearly  marked  with the following  information:  
a) Wire  cloth  designation  (see 6), 
b) Width  and length,  and 
c) Manufacturer's  name  or trade -mark.  
 
10.2 The product  may also be marked with  Standard  Mark . 
 
 
10.2.1  Ihe use of the Standar d Mark  is governed  by the  provisions  of the Bureau of  
Indian Standar ds Act.1986 and  the Rules  and Regulations  made  there  under  .The detail of 
conditions  under which the licence  for the use of Standard Mar k may be  granted to  
manufactures  or producers  may be obtained  from the bureau of I ndian  Standards   
  
 
APPENDIX A (Clause  5.2.2.1)  
METHOD OF EXAMINATION OF CLOTH  
 
A-I. APERTURE WIDTH  
 
A-1.1 Average  Aperture  Width  – To determine  whether  the wire cloth  complies  with the 
requirement  specified  in Table  1, the total number  of apertures  measured  in each direction  
shall be not less than those  given  in Table  2. The measurements  shall  be made  in ten  or 
fifteen fields  (see Table 2) as the case may be, so  chosen  that no two fields  are crossed  by the 
same  wire.  Diagrams  of masks  suitable  for defining  the fields  of measurement  are illustrated  
in Fig. 1.  
 
 
 
FIG 1 MASKS FOR DEFINING THE FIELDS OF MEASUREMENTS  
A-l.2 Measurement  for Determination  or Maximum  Variation  in Individual  Aperture  – To 
determine  whether  the wire  cloth  complies  with the requirements  specified in  Table  1, it 
shall  be examined  across  two diameters,  one across the  warp  and the other  across  the 
weft.  
 
 
 
 
 
 
 A-2.WIRE  DIAMETER  
A-2.1To  determine  whether  the wire diameter  complies  with the require ment  specified in  
Table1  ten, consecutive  wires  shall  be measured  in each direction  in each field. 
 
TABLE 2 NUMBER OF APERTURES TO BE MEASURED (Clause -1.1) 
 
NOMINAL 
APETURE OF 
WIRE CLOTH  No. OF FIELDS  MAXIMUM NUMBER OF CONSECUTIVE 
APERTURE TO BE MEASURED IN EACH 
DIRECTION  
In each Field               In all fields  
1.70 mm  10 5 50 
1.40 mm  10 6 60 
1.18 mm  10 8 80 
1.00 mm  10 9 90 
850 microns  10 10 100 
710 microns  10 12 120 
600 microns  10 15 150 
500 microns  10 15 150 
425 microns  10 20 200 
355 microns  10 25 250 
300 microns  10 30 300 
250 microns  10 30 300 
212 microns  15 20 300 
180 microns  15 20 300 
150 microns  15 25 375