Determination of Fiber Blend Composition of Wool-Cotton

 
Fiber Blend Composition of Wool-Cotton

Fiber Blend Composition of Wool-Cotton/Polyester/Nylon

Scope

This SOPS prescribes a method for quantitative chemical analysis of binary mixtures: in any textile form, such as fibres, yarn or fabric, of one protein fibres with certain non-protein fibres as follows:

Protein Fibres
  • Wool
  • Silk
  • Mohair
  • Cashmer   
Non-Protein Fibres
  • Cotton,
  • Nylon (Polymide)
  • Polyester
  • Polypropylene
  • Chloro Fibres 
  • Glass

Apparatus

  • Drying Oven - For drying Sample (105 ± 3°C )
  • Desiccator
  • Analytical Balance - Capable of weighing an accuracy of 0.0002 g
  • Conical Flask - 250 ml
  • Sieve

Reagent

  • 5 % Sodium Hydroxide (Naoh) or 5 % Potassium Hydroxide (KOH)
  • 5 % Acetic Acid (m/m) 

Procedure

  • Sample weighing about 2.0 to 3.0 g. Cut the yarn into pieces and dissect the cloth into yarn pieces of about 10 mm length.
  • Dry the sample in oven at 105 ± 3°C for 30 min.
  • Cool in a Desiccator and weight them 1 gm sample (W)
  • To the sample contained in the conical flask, add 100 ml of 5 % Naoh or 5 % KOH solution.
  • Boil for 10 minutes
  • After cool the solution, filter the content of the flask through a sieve
  • wash the residue on the filter sieve with hot water, dilute Acetic (5 %) solution and finally cold distilled water.
  • Dry the residue in the drying oven at 105 ± 3°C to constant weight,
  • Cool in a desiccator and weight them (W1)


Calculation

Wool fibre (%) = 100 - W1*100 / W

Where
  • W1 - Dry weight of residue
  • W   - Dry weight of sample

References - IS 2006 : Method for quantitative chemical analysis of binary mixtures of protein fibres with certain other non-protein fibres

 





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