BS 4060:2006 pdf download
BS 4060:2006 pdf download.Pressed wool felts – Specification.
C. 1.3.4 Procedure
Take about 5 g of the sample, l)rePare(1 as (lescribc(l in C. 1.2, and weigh to the nearest 0.1 mg. Bring 150 ml of sodium hydroxide solution to the boil in a 500 ml conical flask fitted with a reflux condenser. Transfer the specimen to the flask and boil gently for 20 mm. Remove from the heat and add 150 ml of cold water.
Filter through the sintered glass crucible, washing well with water.
Wash the residue consecutively with dilute acetic acid, dilute ammonia and, finally, water.
Dry under suction and then in an oven at (105 ± 3) °C. Transfer the
fibrous residue from the filter to a weighing bottle. Allow to condition in the standard atmosphere as specified in 7.3 for 4 h and determine the mass.
C.1.3.5 Calculation of results
The wool fibre content, W, expressed as a percentage of the clean, conditioned sample, is given by the equation:
(lOOmx 1.05)
ns is the conditioned mass of the specimen (g); ;n is the conditioned man of the residue (g);
1.05 is the correction factor for loss in mass of the insoluble components.
C.1.3.6 Test report
The test report shall include the following:
a) all information necessary for identification of the sample tested;
I,) reference to this British Standard, i.e. BS 4060:2006;
c) the method used;
(1) any deviations from the procedure specified;
e) the observations/measurements made;
f) any unusual features (anomalies) observed during the test
g) the date of the test.
C.1.4 Wool content of mixtures of wool and regenerated protein fibre
C.1.4.1 Principle
The phosphorus content is determined colorimetncally following wet ashing, and from this the percentage of regenerated protein content is calculated.
For blends of wool and regenerated protein only, the wool content is then directly derived. For blends containing both protein and
non-protein fibres, additional analysis as described in C.1.4 orBS 4407 is necessary.
Apply heat gradually and digest with further addition of nitric acid as necessary until the solution is clear and colourless. Remove excess nitric avid by evaporating down to fuming, cool and carefully add 25 ml of water. Boil vigorously for 5 mm to ensure quantitative conversion of phosphoric acids to orthophosphoric acid, cool and dilute to 250 ml in a volumetric flask to give solution A.
Transfer a suitable aliquot (usually 5 ml or 10 ml) of solution A to a
100 ml beaker. Neutralize with dilute ammonia, and dilute to 40 ml. Add
4 ml of the ammonium molybdate solution, mix well and (hen add 0.1 g
of L-ascorbic acid.
Boil for 1 mm, cool, transfer to a 50 ml volumetric flask and dilute to volume.
Prepare a reagent blank in a similar manner and read the absorbance of the solution against the reagent. blank on the spectrophotonwter at a wavelengt.h of 820 nm, using an appropriate cell.
Determine the phosPhorus content, in micrograms, by reference to the calibration curve outlined in C.1.4.4.1.
C.1.4.5 Calculation of results
C.l.4.5.1 The phosphorus content, P, expressed as a percentage of the clean, dry conditioned specimen, is given by the equation:
– 0.025B mA
where:
B is the phosphorus content of the test solution (j.Lg);
A is the volume of solution A used (ml) (see C. 1.5.4.2):
an is the mass of specimen taken (g).
C.l.4.5.2 Using the values of 0.65 for the phosphorus content of regenerated protein and 0.007 for the phosphorus content of wool, the regenerated fibre content, R, expressed as a percentage of the clean, dry conditioned specimen, is given by the equation:
where:
P is the percentage phosphorus content of the clean, dry conditioned specimen.
Where no other fibres are present. the wool content. W, expressed as a percentage of the clean, dry conditioned specimen, is given by the equation:
If fibres other than protein fbres are present, perform an additional analysis in accordance with the method described in C.1.3 or BS 4407, as appropriate.
