pH Determination

 pH meter

Scope and Field of Application

We can determine the pH of water borne coatings and their components. In many cases the stability of paints is pH dependent and measurement of this parameter is an important quality control check.

This work is not carried out to any international standard, we use our own in-house method.

Summary of Method

Although indicator papers are widely used for determining the pH of aqueous solutions, we find they are less than ideal when measuring coloured paint samples. We use a pH meter fitted with a flat tip electrode. This type of electrode has the advantages that it is easy to clean and can be used with highly structured paints. Calibration is carried out using commercially available buffer solutions in a temperature controlled environment.

Sample Requirements

We require no more than 100 g of sample.

Accreditation

Although PRA is accredited to ISO 17025 by the United Kingdom Accreditation Service (UKAS), we are not accredited to carry out this particular test.

 

Please contact Peter Collins for further details.

 

Back to Paint Testing Laboratory Page

Back to Testing Paints Prior to Application Page

Back to top of page