F12: Ph Of Aqueous Extract

AWTA TEST CODE

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F12

OTHER NAMES

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TEST METHODS

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AS 2001.3.1
AS 1301
AATCC 81
ASTM D2165
DEF 5037.B2
ISO 3071

IMAGE

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pH Meter

APPLICATION

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The three extraction methods available are applicable to textiles in all forms. Selection of the appropriate procedure will depend on such factors as whether the fibres and finishes are impervious to cold (but not hot) water and whether steam volatile extractable material is lost under reflux (although it may be retained using cold water).

PRINCIPLE

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A tared test specimen is either:

(i) shaken in deionised water,

(ii) boiled in deionised water, or

(iii) boiled in deionised water under reflux for a given time and the pH of the aqueous extract measured by a potentiometric method using a glass electrode at room temperature.

SAMPLES REQUIRED FOR TESTING

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The laboratory sample should be representative of the bulk of the material and sufficient to provide a number of test specimens each of 2.0 ± 0.1g. Minimum total sample weight required 10g.

INTERPRETATION

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The pH of an aqueous extract of a textile material affords a useful index of its processing history. Treatments carried out under acid or alkaline conditions give rise to aqueous extracts having pH values in the range 2 to 11 units. A pH of 7.0 indicates a neutral conditions, whilst values of 2.0 to 7.0 indicate an acid condition and values of 7.0 to 11.0 an alkaline one. Ideally, pH values near neutral are desirable for aqueous extracts from finished textiles.

SERVICE TARGET

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3 days

COST

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See current fees list