SIST ISO 2049:1996 PDF

Name: SIST ISO 2049:1996 — Petroleum products -- Determination of colour (ASTM scale)
SKU: SIST ISO 2049:1996
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Petroleum products -- Determination of colour (ASTM scale)

Название (английский):

SIST ISO 2049:1996

Petroleum products -- Determination of colour (ASTM scale)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 1 декабря 1996 г.
ICS:: 75.080
Технический комитет:: NAD - Petroleum products, lubricants and related products

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Описание (английский):

La présente Norme internationale prescrit une méthode de détermination visuelle de la couleur de certains produits pétroliers, tels que les huiles lubrifiantes, les combustibles de chauffage, les combustibles pour moteurs diesels et les cires de pétrole. Elle est limitée aux produits qui ne contiennent pas de colorants artificiels.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 2049:1996 specifies a visual method for the determination of colour of petroleum products using the ASTM colour scale (glass standard comparators). It applies to clear petroleum liquids and waxes that do not contain artificial colourants - for example, lubricating oils, heating fuels, diesel fuels and petroleum waxes. The standard defines sample preparation, instrument and lighting requirements, comparison procedure, result expression and quality (fidelity) criteria.

Key topics and requirements

Scope limitation: applies only to products without added dyes; waxes and petroleum products that can be examined visually when clear.

Principle: visually compare a test sample against glass colour standards under controlled daylight-type artificial illumination; select the matching standard (or the nearest darker one) on the ASTM scale.

Sample preparation:

Use clear, neutral glass test cells; fill to specified depth (≥50 mm).
If cloudy, heat until turbidity disappears and assess at elevated temperature.
For samples darker than colour 8, dilute 15 volumes sample + 85 volumes specified petroleum solvent (kerosene-type) and test the mixture.

Apparatus and lighting:

Use a colorimeter with two- or three-way viewing compartments and glass colour standards (see Annex A).
Artificial daylight source: lamp temperature specified (2 750 K or 3 300 K for halogen), with a daylight filter and frosted diffuser; illuminance on diffuser of 900 lx ± 100 lx.
Filter and source must meet spectral/transmittance criteria to emulate diffuse daylight.

Result expression:

Report the ASTM colour number, e.g. “colour 7.5”.
If intermediate, prefix darker glass number with “L”, e.g. “colour L 7.5”.
Darker than 8 reported as “colour D 8”; diluted results annotated with “Dil”.

Fidelity (quality):

Repeatability limit: 0.5 colour units (95% confidence).
Reproducibility limit: 1.0 colour unit (95% confidence).

Applications and users

ISO 2049 is used for:

Quality control in refineries, lubricant and fuel manufacturing.

Incoming/outgoing inspection by fuel and oil suppliers.

Independent analytical laboratories performing routine colour specification testing.

Regulatory and specification compliance where colour is a defined property.

Keywords: ISO 2049, petroleum products, colour determination, ASTM scale, colorimeter, laboratory testing, fuel quality, lubricant testing.

Related standards

Standards referenced in ISO 2049 include:

ISO 3015 / ISO 3016 (test cell dimensions, pour/trouble points)

ISO 3696 (laboratory water)

ISO 6271 (Platinum–cobalt colour scale)

ISO 6353-2 (reagent specifications)

This method provides a practical, standardized visual procedure for consistent colour reporting of petroleum products in QC and compliance workflows.

SIST ISO 2049:1996 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

Технические детали

ISO 2049:1996

Petroleum products — Determination of colour (ASTM scale)

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SIST EN ISO 3016:2019

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SIST EN ISO 3696:1998

Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)

SIST EN ISO 6271:2016

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ISO 6353-2:1983/Add 2:1986

Reagents for chemical analysis — Part 2: Specifications — First series — Addendum 2