Test Method: SATRA TM349

Acidity - pH value and pH difference figure - of an aqueous extract

January 1996

SCOPE

This method is intended to determine the acidity of an aqueous extract of a material. The method is applicable to all types of leather, leatherboards, fibreboards and textiles.

PRINCIPLE

Part 1 – pH value: A milled test specimen of known mass is extracted with water for a predetermined time and the pH of the unfiltered extract is measured.

Part 2 – pH difference figure (if required): The extract (Part 1) is filtered, diluted by a factor of 10 and the change in pH from (Part 1) measured.

REFERENCES

This Test Method does not reference any additional Standards or Test Methods.

HISTORY

First issued January 1996.

AVAILABILITY

This test method is available to members and non-members.

PRICE (ex. VAT)

This price is for a printed copy of the Test Method.

• Members: £75
• Non-members: £215

TYPE

• Composition

USAGES

• Leather - general
• Textiles and coated textiles, including synthetic uppers and linings