ASTM D664 PDF

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Active view current version of standard. Other Historical Standards. More D It is applicable for the determination of acids whose dissociation constants in water are larger than 10 -9 ; extremely weak acids whose dissociation constants are smaller than 10 -9 do not interfere. Salts react if their hydrolysis constants are larger than 10 The range of acid numbers included in the precision statement is 0.

In new and used oils, the constituents that may be considered to have acidic characteristics 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. Although the titration 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 relationship between bearing corrosion and acid number is known. The acid number obtained by this standard may or may not be numerically the same as that obtained in accordance with Test Methods D and D There has not been any attempt to correlate this method with other non-titration methods. A few laboratories have made the observation that there is a difference in Test Method D results when aqueous versus nonaqueous buffers are used.

No other units of measurement are included in this standard. This 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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Scope 1. Note 1 In new and used oils, the constituents that may be considered to have acidic characteristics 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.

Note 2 The acid number obtained by this standard may or may not be numerically the same as that obtained in accordance with Test Methods D and D Note 3 A few laboratories have made the observation that there is a difference in Test Method D results when aqueous versus nonaqueous buffers are used. Link to Active This link will always route to the current Active version of the standard.

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Acid Number of Petroleum Products According to ASTM D664

Active view current version of standard. Other Historical Standards. More D It is applicable for the determination of acids whose dissociation constants in water are larger than 10 -9 ; extremely weak acids whose dissociation constants are smaller than 10 -9 do not interfere. Salts react if their hydrolysis constants are larger than 10 The range of acid numbers included in the precision statement is 0. In new and used oils, the constituents that may be considered to have acidic characteristics 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.

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Brochure: ASTM D664 – Acid number

Our website uses cookies to offer you the best possible browsing experience. By continuing to use the website, you agree to the use of cookies. Find upgrades, patches, documents, and language versions for your software here. Find out what Metrohm has to offer for environmental analysis in air, soil, and water. Find out what Metrohm has to offer for the analysis fossil or biogenic products in accordance with international standards. Find out what Metrohm has to offer for quality control and drug manufacturing monitoring and improving in accordance with international standards. Find out what Metrohm has to offer for food and beverage analysis in accordance with international standards.

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ASTM D664 - 18e2

It is applicable for the determination of acids whose dissociation constants in water are larger than 10 —9 ; extremely weak acids whose dissociation constants are smaller than 10 —9 do not interfere. Salts react if their hydrolysis constants are larger than 10 —9. The range of acid numbers included in the precision statement is 0. This test method requires the use of an automatic titrator with automatic endpoint-seeking capability. Although the titration 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.

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Historical Version s - view previous versions of standard. More D The relative amount of these materials can be determined by titrating with bases. The acid number is a measure of this amount of acidic substance in the oil, always under the conditions of the test. The acid number is used as a guide in the quality control of lubricating oil formulations.

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