DRAFT TANZANIA STANDARD              TDC 11  CD 2 (1947) 
                                                                                                                  First Edition                                           
©TBS 2018 All right reserved                                                                      First edition 2023 
  
Leather  – Lining  - Specification  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TANZANIA BUREAU OF STANDARDS  
  
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©TBS 2018 All right reserved                                                                      First  edition 2023 
              TDC 11 CD 2 (1947)  
Foreword  
This Draft Tanzania Standard is being developed by the Leather and Leather Products  Technical 
Committee under supervision of the Textile and Leather Division Standards Committee and it is in 
accordance with the procedures of the Bureau.  
 This Tanzania Stan dard has been prepared with assistance drawn from:  
 . 
     IS 4191 , Lining Leather Specification.  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
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©TBS 2018 All right reserved                                                                      First  edition 202 2 
 1 Scope  
This Draft Tanzania standard prescribes requirements , test methods,  and methods of 
sampling for lining  leather.  
2 Normative references  
The following referenced documents are indispensable for the application of this standard. For dated 
references, only the edition cited applies. For undated references, the latest edition of the referenced 
document (including any amendments) applies.  
The following referenced documents are indispensable for the application of this document.  
 
 TZS 4 Rounding off numerical values.  
 TZS 188 Hides, skins and leather — glossary of terms.  
 TZS 195, Leather - Chemical tests – Determination of matter soluble in Dichloromethane and 
 free fatty acid content.  
 TZS 197, Leather - Determination of sulphated total ash and sulphated water -insoluble ash.  
 TZS 196, Leather – Determination of total wate r – soluble matter, water – soluble inorganic 
 matter and water soluble – organic matter.  
 TZS 199 Leather, Determination of pH and difference figure of an aqueous extract.  
 TZS 200, Leather – Determination of nitrogen content and “Hide substance” – Titrim etric 
 method.  
 TZS 205 Leather — Physical testing — Measurement of thickness  
 TZS 211, Leather – Test for colour fastness – Colour fastness to cycles of to and fro rubbing.  
 TZS 3574, Leather — Chemical determination of chromium(VI) content in leather.  
ISO 3376, Leather — Physical and mechanical tests — Determination of tensile 
strength and  percentage elongation  
 ISO 10195, Leather — Chemical determination of chromium(VI) content in 
 leather —  Thermal pre -ageing of leather and determination of hexavale nt 
 chromium.  
 ISO 11641, Leather — Tests for colour fastness — Colour fastness to perspiration.  
 ISO 14268, Leather — Physical and mechanical tests — Determination of water 
 vapour permeability.  
 ISO 17070, Leather — Chemical tests — Determination of tetrachlorophenol -, 
 trichlorophenol  , dichlorophenol -, monochlorophenol -isomers and pentachlorophenol 
 content.  
 ISO 17076, Leather — Determination of abrasion resistance.  
 ISO 17234, Leather — Chemical tests for the determination of certain azo colorants 
 in dyed leathers.  
 ISO 17226, Leather — Chemical determination of formaldehyde content.  
 ISO 23910, Leather — Physical and mechanical tests — Measurement of stitch tear 
 resistance.   
 
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©TBS 2018 All right reserved                                                                      First  edition 202 2 
  
3 Terms and definitions  
For the purpose of this  Draft Tanzania Standard, the f  terms and definitions are given in TZS 188 
(Hides, skins and leather glossary of terms.  
4 TYPES  
Lining leather shall be of the three types:  adopt the format of CD2 – (1945)  
a) Type 1  — Combination tanned lining leather (combination of vegetable and chrome  
tanning),  
b) Type 2  — Vegetable tanned lining leather, and  
c) Type 3  — Full chrome tanned lining leather.  
 
5 REQUIREMENTS  
5.1 Raw Material  
The material shall be either light weight hides or skins . 
5.2 Tanning  
The lining leather shall be prepared by either  of the three types  of leather lining . 
5.2.1  Preservatives containing pentachlorophenol (PCP) shall not be used and the manufacturer shall 
give a declaration to this effect along with the consignment.  
5.3 Finishing  
The leather shall be finished with the flesh side smooth and buffed well. It shall be free from open 
grub holes, cuts, and open surface blemishes and shall be mellow and yet tight grained.  
The leather shall be dyed uniformly and/or finished with pigment subject to agreement between the 
buyer  and the seller . 
 
5.4 Physical and chemical requirements  
The material shall comply with the physical requirements and chemical requirements given in Table 1  
and Table 2 respectively . 
5.5 Hazardous Chemicals  
The leather shall conform to the requirements given in Table 3, when tested in accordance with the 
methods prescribed in col umn 4 of Table 3.  
 
5.6 Sizes and Shape  
The material shall be supplied in the form of trimmed full pieces and free from toggle, punch and nail 
marks.  
 NOTE — Care shall be taken in trimming to ensure a minimum wastage and to obtain a reasonable 
 cutting value out of each piece.  
 
  
 
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©TBS 2018 All right reserved                                                                      First  edition 202 2 
 Table 1 – Physical requirements for leather lining  
SN Parameter  Requirements  Test Method  
1 Thickness, min  As agreed between buyer and 
seller  with a tolerance of ±2 % TZS 205  
2 Tensile strength, MN/m2 
(kgf/cm2), Min  15 (150)  ISO 3376  
3 Stitch tear strength/m 
(kgf/cm) thickness, Min 44 ISO 23910   
4 Colour fastness test for 
finished leather,  (contrast 
grading after 1 024 
revolutions), min  
a) Dry rubbing  
b) Wet rubbing  
  
 
 
 
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3 TZS 211  
5 Colour fastness to 
perspiration, min  3 ISO 11641  
6 Water vapour permeability, 
mg/cm2/h, Min 2 ISO 14268  TZS  
7 Abrasion resistance, Not 
worse than:  
a) 25,600 cycles of dry 
rubs 
b) 6,400 cycles of wet 
rubs  
 
Moderate abrasion   ISO 17076   
 
 
Table 2 – Chemical requirements for leather lining  
S/N Parameter  Requirements  Test Method  
Type 1  Type 2  Type 3  
1 Solvent extractable 
substances, percent by mass, 
min 3.0  3.0  3.0 TZS 195  
2 Chromium (as Cr 2O3), percent 
by mass, Max 0.75 - 0.25 TZS 3574  
3 Water soluble matter, percent 
by mass, Max 3.0 10.0 2.0 TZS 196  
4 Water insoluble ash, percent by mass, Max:  TZS 197  
a) Pigment finished leather  6.0 5.0 7.0 
b) Aniline or unfinished leather  2.0 2.0 2.0 
5 pH of water solubles, Min 3.5 4.0 3.5 TZS 199  
6 Hide substance, percent by  
mass, Min 55 40 55 TZS 200  
 
 
 
 
  
 
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©TBS 2018 All right reserved                                                                      First  edition 202 2 
 Table 3 -  Restriction on Hazardous Chemicals  
SN Parameter  Requirements  Test Method  
1 Formaldehyde, mg/kg, Max 150 ISO 17226  
2 Pentachlorophenate, mg/kg, Max 5 ISO 17070  
3 Coupled amines released from azo -
dyes (sum  the parameters), mg/kg, 
Max 30 ISO 17234  
4 Hexavalent chromium, mg/kg, Max 3 ISO 10195  
 
6 PACKING AND MARKING  
6.1 Packing  
The leather shall be packed as agreed to between the buyer  and the seller . 
6.2 Marking  
Each leather at the tail end of the flesh side shall be marked with its area, in dm, and the type. The 
packages shall be marked with the following information:  
a) Name of the manufacturer , address  and/ or trade -mark, if any;  
b) Name and type of leather ; 
 c) Quantity (n umber of pieces of leather ); 
 d) Thickness, mm 
 e) Total area and mass; and  
 f) Month and year of manufacture.