Name: ASTM D 7946 : 2014
Brand: ASTM
Price: 75.00 USD

ASTM D 7946 : 2014

Superseded

View Superseded by

Standard Test Method for Initial pH (i-pH)-Value of Petroleum Products

Available format(s)

Hardcopy , PDF

Superseded date

01-29-2020

Language(s)

English

Published date

07-01-2014

Publisher

American Society for Testing and Materials

CONTAINED IN VOL. 05.04, 2017 Defines procedures for the determination of initial pH (i-pH) in new and in-service lubricants.

1.1This test method covers procedures for the determination of initial pH (i-pH) in new and in-service lubricants.

Note 1:In new and used oils, the constituents that may be considered to have characteristics influencing the i-pH value include organic and inorganic acids, esters, phenolic compounds, lactones, resins, salts of heavy metals, salts of ammonia and other weak bases, acid salts of polybasic acids, and addition agents such as inhibitors and detergents. “Initial” is used to differentiate from aqueous systems. The analysis is terminated after a defined time interval whenever equilibrium conditions, as known for pH measurements in aqueous systems, are not reached (see 3.1.1.2)

1.2This test method is used to indicate relative changes that occur in oil during use under oxidizing conditions or due to contamination by blow-by gases of combustion processes of biogases regardless of the color or other properties of the in-service lubricants. Although the initial pH is made under definite equilibrium conditions, the test method is not intended to measure an absolute acidic property that can be used to predict performance of oil under service conditions. No general correlation between corrosion of non-ferrous bearing metals and initial pH value is known.

1.3The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Committee	D 02
DocumentType	Test Method
Pages	5
PublisherName	American Society for Testing and Materials
Status	Superseded
SupersededBy	ASTM D 7946 : 2019

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ASTM D 1193 : 1970	Standard Specification For Reagent Water
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ASTM D 1193 : 2006	Standard Specification for Reagent Water
ASTM D 1193 : 1999	Standard Specification for Reagent Water
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ASTM D 1193 : 2006 : R2018	Standard Specification for Reagent Water
ASTM D 4177 : 2015 : REV A	Standard Practice for Automatic Sampling of Petroleum and Petroleum Products
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