ISO 3074-2014 pdf download.Wool- Determination of dichloromethane-soluble matter in com bed sliver.
ISO 3074 specifies a method for determining the dichloromethane-soluble matter in combed wool sliver. Its use can be extended to wool in other forms.
It should be recognized that extraction with dichloromethane under the prescribed conditions does not completely remove all the fatty material present in a sample of wool. A further amount, possibly material of similar character, will usually be extracted by the use of solvents that cause greater swelling of the wool fibres.
The method is applicable only to 100 % wool products. It can give misleading results if applied to products in which fibres other than wool are present.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 139, Textiles一Standard atmospheres for conditioning and testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 dichloromethane-soluble extract material extracted from wool by dichloromethane under prescribed conditions
4 Principle
Once the appropriate specimen has been selected, it is then extracted in a Soxhlet extraction apparatus,using dichloromethane as the extraction solvent. The solvent is evaporated and both the residue and the extracted wool sample are oven-dried and weighed after cooling. The extractable matter is calculated by expressing the oven-dry mass of the residue as a percentage of the oven-dry mass of the extracted test specimen.
5 Reagents
5.1 Dichloromethane (methylene chloride), boiling range 39°C to41 °C.When 100 ml of the solvent is evaporated, the residue shall not exceed 1 mg.
WARNING一Dichloromethane is toxic, the room in which extractions are made shall be adequately ventilated.
5.2 Acetone, analytical reagent quality.
6 Apparatus
6.1 Soxhlet extraction apparatus, assembled with ground glass joints and protected against the entry of moisture. The extractor (barrel) of the Soxhlet shall conveniently have a capacity of about 200 ml to 300 ml and the flask 250 ml.
6.2 Water-bath or other suitable means of low temperature heating.
6.3 Balance, with an accuracy of 0,01 g, preferably with large scale-pan.
6.4 Analytical balance, accurate to 0,000 1 g.
6.5 Desiccator.
6.6 Drying oven, capable of being controlled at a temperature of 105 °C+3。C.
6.7 Distillation unit.
6.8 Fat-free filter papers.
7 Conditioning and testing atmosphere
Pre-conditioning, conditioning, and testing shall be carried out in the standard atmosphere specified in
ISO 139.
8 Sampling
The laboratory sample shall be representative of the bulk of material and shall be sufficient to provide two test specimens each of mass approximately 10 g.Useful information on sampling is given in ISO 1130.
9 Procedure
9.1 Precondition the laboratory sample as specified in ISO 139, and then bring it to constant mass by exposing it for not less than 24 h in the standard atmosphere for testing (see Clause 7].
a) Insert a glass wool plug at the bottom of the Soxhlet barrel, effectively covering the exit tube.
b) Pack the test specimen into a Soxhlet thimble covering with a loose plug of dichloromethane-extracted cotton wool.
c) Enclose the test specimen in fat-free filter paper (6.8). ISO 3074 pdf download.
Tags: Wool
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