?u= Wed, 06 Nov 2024 02:31:45 +0000 en-US hourly 1 https://wordpress.org/?v=6.7.1 ?u=/wp-content/uploads/2024/11/cropped-icon-150x150.png ?u= 32 32 ?u=/product/publishers/jis/jis-k-24362007/ Wed, 06 Nov 2024 02:31:45 +0000 Naphthalene for industrial use

Published By	Publication Date	Number of Pages
JIS	2007-11-20	31

]]> Naphthalene for industrial use

Published By	Publication Date	Number of Pages
JIS	2007-11-20	31

]]> ?u=/product/publishers/jis/jis-k-15211982-r1988/ Wed, 06 Nov 2024 02:30:40 +0000 Perchloroethylene

Published By	Publication Date	Number of Pages
JIS	1982-11-01	18

]]> Perchloroethylene

Published By	Publication Date	Number of Pages
JIS	1982-11-01	18

]]> ?u=/product/publishers/iso/iso-52821982/ Tue, 05 Nov 2024 23:28:40 +0000 Aromatic hydrocarbons — Determination of sulphur content — Pitt-Ruprecht reduction and spectrophotometric method

Published By	Publication Date	Number of Pages
ISO	1982-01	8

]]> Relates to products boiling below 200 °C. Directly applicable to contents of 0.1 mg/kg to 30 mg/kg. Higher contents may be determined by a suitable dilution of the sample. Alkylsulphones, arylsulphonic acids and arylsulphonates give incomplete recovery of sulphur. Reduction of the sulphur compounds to nickel sulphide with Raney nickel. Stripping of the hydrogen sulphide in hydrochloric acid medium and absorption in an alkaline zinc acetate solution. Formation of methylene blue with N,N-dimethyl-p-phenylenediamine sulphate and iron(III) ammonium sulphate. Determination of the absorbance of the blue coloured solution at a wavelength of 667 nm.

]]> ?u=/product/publishers/iso/iso-52811980/ Tue, 05 Nov 2024 23:28:40 +0000 Aromatic hydrocarbons — Benzene, xylene and toluene — Determination of density at 20 degrees C

Published By	Publication Date	Number of Pages
ISO	1980-02	11

]]> Specifies pyknometer and hydrometer methods. The principle of the pyknometer method bases on weighing an empty pyknometer, then filled with water and, finally, filled with the product under test at known temperatures. Calculation of the density from the values obtained applying certain corrections given in tables. The hydrometer method bases on the immersion of a hydrometer in the product under test and recording the hydrometer scale reading and the temperature. Calculation of the density from the values obtained after applying a correction to be obtained from the calibration certificate.

]]> ?u=/product/publishers/iso/iso-52771981/ Tue, 05 Nov 2024 23:28:39 +0000 Aromatic hydrocarbons — Determination of residue on evaporation of products having boiling points up to 150 degrees C

Published By	Publication Date	Number of Pages
ISO	1981-11	4

]]> Applicable to products having boiling points lower than or equal to 150 0C. The lower limit of detection is 1 mg/100 ml. Based on evaporation of a test portion in a weighed dish, and determination of the increase in mass of the dish, which represents the residue.

]]> ?u=/product/publishers/iso/iso-52801979/ Tue, 05 Nov 2024 23:28:39 +0000 Xylene for industrial use — Specification

Published By	Publication Date	Number of Pages
ISO	1979-07	4

]]> Applicable to products which consist essentially of xylene isomers ÄC6H4 -(CH3 )2 Ü and ethylbenzene (C6H5 -C2 H5). Specifies the requirements and test methods. The required characteristics are shown in a table.

]]> ?u=/product/publishers/iso/iso-52761979/ Tue, 05 Nov 2024 23:28:37 +0000 Aromatic hydrocarbons — Test for neutrality

Published By	Publication Date	Number of Pages
ISO	1979-07	3

]]> Mixing a test portion to which a mixed indicator (bromocresol green/alizarin red S) has been added with water by shaking. Comparison of the colour of the aqueous layer with that of a neutral solution of the indicator.

]]> ?u=/product/publishers/iso/iso-52752003/ Tue, 05 Nov 2024 23:28:36 +0000 Petroleum products and hydrocarbon solvents - Detection of thiols and other sulfur species — Doctor test

Published By	Publication Date	Number of Pages
ISO	2003-06	10

]]> ISO 5275: 2003 specifies a procedure (Doctor test) for the detection of thiols (mercaptans), hydrogen sulfide and elemental sulfur in hydrocarbon solvents and distillate petroleum feedstocks and products.

]]> ?u=/product/publishers/iso/iso-52741979/ Tue, 05 Nov 2024 23:28:36 +0000 Aromatic hydrocarbons — Acid-wash test

Published By	Publication Date	Number of Pages
ISO	1979-07	4

]]> Specifies an acid washing test. Gives some indication of the degree of refining but does not give a precise measure of the amount of unsaturated compounds present as different unsaturated compounds produce different colourations with sulphuric acid. Shaking together of equal volumes of the sample and 95 % (m/m) sulphuric acid. Comparison of the colour of the acid layer with that of standard matching solutions.

]]> ?u=/product/publishers/iso/iso-52721979/ Tue, 05 Nov 2024 23:28:36 +0000 Toluène à usage industriel — Spécifications

Published By	Publication Date	Number of Pages
ISO	1979-02	4

]]> Specifies requirements for two grades. Grade 1 (synthesis grade) is a high quality grade normally required only for the use as a chemical feedstock. Grade 2 (ordinary grade) is suitable for most normal commercial uses. The requirements are given in a table.

]]>