ISO 3074-2014 pdf free download

ISO 3074-2014 pdf free download.Wool — Determination of dichioromethane-soluble matter in combed sliver
Laine — Méthode de determination de I’extrait dichiorométhanique dans un ruban de lame peignée.
4 Principle
Once the appropriate specimen has been selected, it is then extracted in a Soxhlet extraction apparatus, using dichioromethane 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 to 41 °C.
When 100 ml of the solvent is evaporated, the residue shall hot exceed I mg
WARNING — Dlchloromethane 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 Soxhiet 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).
9.2 In the standard atmosphere for testing, prepare two test specimens each of mass lOg ± 0,5 g [use large scale-pan ()]. For each duplicate test, introduce the test specimen into the Soxh let barrel in such a way that the extract will not carry wool fibres Into the siphon tube and that the level of the top of the test specimen is below that of the end of the siphon tube. A particle-free extract may be secured by one of the following methods:
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 Soxhiet thimble covering with a loose plug of dichloromethaneextracted cotton wool.
c) Enclose the test specimen in fat-free filter paper (6.).ISO 3074-2014 pdf free download.