BS 4407:1988

Foreword
Committees responsible
Methods
Section one. General
1 Scope
2 Definitions
Section two. Information common to the methods given
               for the quantitative analysis of fibre
               mixtures
3 Apparatus
4 Reagents
5 Conditioning and testing atmosphere
6 Sample
7 Pretreatment of sample
8 Test procedure
9 Calculation and expression of results
10 Report
Section three. Method of quantitative analysis by
               manual separation
11 General
12 Principle
13 Apparatus and reagents
14 Test procedure
15 Calculation and expression of results
Section four. Methods of quantitative analysis by
               chemical procedures
16 Precision of the methods
17 Method 1. Binary mixtures of acetate and certain
    other fibres (method using acetone)
18 Method 2. Binary mixtures of certain protein fibres
    (wool, animal hair, silk or protein) and certain
    other fibres (method using hypochlorite)
19 Method 3. Binary mixtures of viscose, cupro or
    certain types of modal and cotton (method using
    formic acid and zinc chloride)
20 Method 4. Binary mixtures of polyamide 6 or
    polyamide 6.6 and certain other fibres (method using
    formic acid 80 % m/m)
21 Method 5. Binary mixtures of acetate and triacetate
    (method using benzyl alcohol)
22 Method 6. Binary mixtures of triacetate and certain
    other fibres (method using dichloromethane)
23 Method 7. Binary mixtures of certain cellulose
    fibres and polyester (method using sulphuric acid
    75 % m/m)
24 Method 8. Binary mixtures of acrylics, certain
    modacrylics or certain chlorofibres and certain
    other fibres (method using dimethylformamide)
25 Method 9. Binary mixtures of certain chlorofibres
    and certain other fibres (method using carbon
    disulphide/acetone 55.5/44.5)
26 Method 10. Binary mixtures of acetate and certain
    chlorofibres (method using glacial acetic acid)
27 Method 11. Binary mixtures of silk and wool or hair
    (method using sulphuric acid 75 % m/m)
28 Method 12. Deleted
29 Method 13. Binary mixtures of jute and certain
    animal fibres (method of determining the nitrogen
    content)
30 Method 14. Binary mixtures of flax and viscose
    (method using sulphuric acid)
31 Method 15. Binary mixtures of polypropylene and
    certain other fibres (method using xylene)
32 Method 16. Binary mixtures of chlorofibres
    (homopolymers of vinyl chloride) and certain other
    fibres (method using concentrated sulphuric acid)
33 Method 17. Binary mixtures of asbestos and certain
    fibres (method based on heating to 450 deg C)
34 Method 18. Binary mixtures of chlorofibres, certain
    modacrylics, certain elastanes, acetates,
    triacetates and certain other fibres (method using
    cyclohexanone)
Appendices
A Procedures to be adopted for ternary fibre mixtures
B Agreed allowances for moisture and other matter to
    be used in connection with the analysis of fibre
    mixtures as given in Annex II of the EEC Directive
    on textile descriptions, 71/307/EEC, as amended by
    Directive 83/623/EEC
Tables
1 Precision of methods for ternary mixtures
2 Procedures to be used for quantitative chemical
    analysis of ternary fibre mixtures
Figure
1 Hot extraction apparatus

Methods of analysis after identification of the fibre components of the mixtures.

This British Standard describes methods for the quantitative analysis of textile fibre mixtures after identification of the fibre components of the mixture, including the composition of the individual yarns. Any non-fibrous matter is removed by a suitable pretreatment. If the fibre components do not form an intimate mixture and can be readily separated by hand, the analysis is carried out by the procedure given in section 3.

If part or the whole of the textile consists of an intimate mixture of two fibre types (binary mixture) one of the components is removed using a suitable method²) following the appropriate procedure given in section 4, and the proportion of this component is calculated from the loss in mass. Wherever possible it is preferable to remove the fibre present in greater proportion, thus obtaining the fibre present in the smaller proportion as residue.

If part or the whole of the textile consists of an intimate mixture of three fibre types (ternary mixture) the above process is repeated using a second reagent. Suitable methods for the analysis of specific ternary mixtures are given in Appendix A.

NOTE 1 To obtain a reliable result, at least two determination should be made, either by manual separation or by chemical separation, if the results of duplicate tests differ by more than 2 %, two repeat determinations should be made.

NOTE 2 The titles of the publications referred to in this stand are listed on the inside back cover.