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Description of BS 7393:1990 19901.1 This International Standard specifies a semi-micro colour indicator titration method for the determination of acidic constituents in new or used petroleum products and lubricants soluble in mixtures of toluene and isopropyl alcohol, or capable of existing as suspensions in such mixtures. The method is especially intended for applications in which the amount of sample available to be analyzed is too small to allow accurate analysis by ISO 6619 or ISO 6618. It is applicable to the determination of acids having dissociation constants in water larger than 10-9. Extremely weak acids having dissociation constants smaller than 10-9 do not interfere. Salts titrate if their hydrolysis constants are larger than 10-9. 1.2 This method may be used to indicate relative changes in total acid number that occur in an oil during use under oxidizing conditions. Although the titration is made under definite equilibrium conditions, the method does not measure an absolute acidic property that can be used to predict performance of an oil under service conditions. No general relationship between bearing corrosion and acid number is known. 1.3 Since this test method requires substantially less sample than ISO 6618 or ISO 6619, it provides an advantageous means of monitoring an oxidation test by changes in total acid number by
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$u-9.
About BSIBSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses. |
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