Determining Textile Aqueous Extract Ph Values Using ISO 3071 Methods
ISO 3071 specifies 0.1 mol/L KCl extraction at a 20:1 ratio to measure textile surface ion exchange and prevent false compliance readings.
Liquor Ratio 20 to 1
Extraction Proportion
A volumetric proportion of extraction liquid to textile sample weight in chemical analysis represents a standardized testing condition for soluble substance measurement. Employing a liquor ratio 20 to 1 ensures that the concentration of extracted chemicals lies within the calibration range of laboratory instruments. This proportion prevents the dilution of trace elements while providing sufficient fluid for complete sample submersion.
Standard Method
International testing protocols for determining fabric pH rely on this specific water volume to fabric weight. When applying a liquor ratio 20 to 1, a hundred grams of textile requires exactly two litres of purified water. This relationship is maintained across all test repetitions to ensure statistical consistency between different laboratories.
If the ratio is altered, the measured pH of the extract changes due to varying concentration effects.
Process Impact
Inconsistent water volumes during testing lead to conflicting quality reports between the mill and the brand. This variance causes delays in shipment approval.
Commercial Verification
Brand inspectors verify that the laboratory has adhered to this extraction ratio before accepting test results. They check the laboratory worksheets for the dry weight of the sample and the volume of water added. Incorrect ratios invalidate the certification and require a full re-test of the batch.
Precise volume control is a prerequisite for reliable restricted substance reporting.