Determination in new or used products or lubricants soluble or suspendable in mixtures of toluene or isopropanol. Determination on a sample too small to be accurately analysed by other methods when the acidity has a dissociation constant in water larger than 10^-^9.Cross References:BS 6376:Part 2BS 2000:Part 139ISO 4263ISO 6619Health and Safety at Work etc. Act 1974