SIS SS-ISO 6618-1991
石油產品和潤滑油．中和值．顏色指示劑滴定方法

Petroleum products and lubricants — Neutralisation number — Colour-indicator titration method

SIS SS-ISO 6618-1991 發布歷史

1 This International Standard specifies a colour-indicator titration method for the determination of acidic or basic con-stituents in petroleum products and lubricants soluble in mixtures of toluene and isopropyl alcohol. It is applicable for the determination of acids or bases whose dissociation constants in water are greater than 10 ~9; extremely weak acids or bases whose dissociation constants are less than 10 ~9 do not interfere. Salts react if their hydrolysis constants are greater than 10 "9. NOTES 2 In new and used oils, the constituents considered to have acidic characteristics include organic and inorganic acids, esters, phenolic compounds, lactones, resins, salts of heavy metals, and addition agents such as inhibitors and detergents. Similarly, constituents considered to have basic properties include organic and inorganic bases, amino compounds, salts of weak acids (soaps), basic salts or polyacidic bases, salts of heavy metals, and addition agents such as inhibitors and detergents. 3 This method is not suitable for measuring the basic constituents of many basic additive-type lubricating oils. ISO 6619 can be applied for this purpose. 4 This method may be used to indicate relative changes 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 or basic property that can be used to predict performance of an oil under service conditions. No general relationship between bearing corrosion and acid or base numbers is known. NOTE — Oils, such as many cutting oils, rustproofing oils, and similar compounded oils, or excessively dark-coloured oils, that cannot be analysed by this method owing to obscurity of the colour-indicator end-point, can be analysed in accordance with ISO 6619. The acid or base numbers obtained by this colour-indicator method may or may not be numerically the same as those obtained by ISO 6619, but they are generally of the same order of magnitude.

SIS SS-ISO 6618-1991由SE-SIS 發布于 1991-06-05。

SIS SS-ISO 6618-1991的歷代版本如下：

• 1991年06月05日 SIS SS-ISO 6618-1991 石油產品和潤滑油．中和值．顏色指示劑滴定方法

非常抱歉，我們暫時無法提供預覽，您可以試試： 免費下載 SIS SS-ISO 6618-1991 前三頁，或者稍后再訪問。

注意： 點擊下載后，生成下載文件時間比較長，請耐心等待......

標準號

SIS SS-ISO 6618-1991

發布日期

1991年06月05日

實施日期

廢止日期

無

發布單位

SE-SIS

適用范圍

1 This International Standard specifies a colour-indicator titration method for the determination of acidic or basic con-stituents in petroleum products and lubricants soluble in mixtures of toluene and isopropyl alcohol. It is applicable for the determination of acids or bases whose dissociation constants in water are greater than 10 ~9; extremely weak acids or bases whose dissociation constants are less than 10 ~9 do not interfere. Salts react if their hydrolysis constants are greater than 10 "9. NOTES 2 In new and used oils, the constituents considered to have acidic characteristics include organic and inorganic acids, esters, phenolic compounds, lactones, resins, salts of heavy metals, and addition agents such as inhibitors and detergents. Similarly, constituents considered to have basic properties include organic and inorganic bases, amino compounds, salts of weak acids (soaps), basic salts or polyacidic bases, salts of heavy metals, and addition agents such as inhibitors and detergents. 3 This method is not suitable for measuring the basic constituents of many basic additive-type lubricating oils. ISO 6619 can be applied for this purpose. 4 This method may be used to indicate relative changes 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 or basic property that can be used to predict performance of an oil under service conditions. No general relationship between bearing corrosion and acid or base numbers is known. NOTE — Oils, such as many cutting oils, rustproofing oils, and similar compounded oils, or excessively dark-coloured oils, that cannot be analysed by this method owing to obscurity of the colour-indicator end-point, can be analysed in accordance with ISO 6619. The acid or base numbers obtained by this colour-indicator method may or may not be numerically the same as those obtained by ISO 6619, but they are generally of the same order of magnitude.