ISO 1388-6-1981 rus PDF

Full title and description

Ст ISO 1388-6-1981 — Ethanol for industrial use — Methods of test — Part 6: Test for miscibility with water. Russian-language designation often shown as "Ст ISO 1388-6-1981" for cataloguing; the standard specifies a visual test procedure to determine whether industrial ethanol is miscible with water under defined conditions.

Abstract

This part of ISO 1388 describes a simple visual test for miscibility of industrial ethanol with water. The method consists of adding measured amounts of water to a test portion of ethanol under specified conditions and examining the resulting mixture for opalescence (turbidity) against a black background with side illumination. A second Nessler cylinder containing water is used as the visual standard. The procedure is intended to detect impurities or components that cause lack of miscibility.

General information

• Status: Published (confirmed by ISO review).
• Publication date: 1 November 1981.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.080.60 (Ethanol and related industrial alcohols).
• Edition / version: Edition 1 (1981).
• Number of pages: 2.

Scope

This document applies to ethanol intended for industrial use and specifies a qualitative visual test to determine whether the sample is miscible with water. It covers the principle of the test, basic apparatus and reference (Nessler) cylinder usage, the observation conditions (black background and side illumination) and the interpretation of opalescence as an indicator of poor miscibility. It is one part of the ISO 1388 series of test methods for industrial ethanol.

Key topics and requirements

• Principle of the test: progressive addition of water to a defined test portion and visual observation for opalescence.
• Reference and apparatus: use of a Nessler cylinder containing water as the visual standard and specification of observation conditions (black background, side illumination).
• Sample preparation and procedural controls to ensure comparable observations between laboratories.
• Interpretation: presence of opalescence/turbidity under the specified conditions indicates lack of full miscibility and may signify contamination or unsuitable product quality for applications requiring miscible ethanol.
• Limited scope: qualitative/visual method suitable for routine quality-control screening rather than quantitative impurity analysis.

Typical use and users

Used by quality-control laboratories in chemical and industrial alcohol production facilities, packaging and supply companies, testing laboratories, inspection and certification bodies, and regulators. The method is applied where a quick, low-cost check of miscibility with water is required prior to further testing or use in processes that assume miscible ethanol.

Related standards

Part of the ISO 1388 series (other parts cover additional test methods for industrial ethanol). Examples include adjacent parts of the series that address specific tests such as methanol determination and other quality indicators. ISO Recommendation R 1388:1970 was the predecessor document; ISO 1388-6:1981 and the other parts constitute a technical revision and replacement of that recommendation.

Keywords

ethanol; industrial ethanol; miscibility; water; opalescence; Nessler cylinder; visual test; methods of test; quality control; ISO 1388; Ст ISO 1388-6-1981; Russian translation.

FAQ

Q: What is this standard?

A: ISO 1388-6:1981 is Part 6 of the ISO 1388 series, titled "Ethanol for industrial use — Methods of test — Part 6: Test for miscibility with water." It specifies a visual procedure to check whether a sample of industrial ethanol mixes with water without producing opalescence.

Q: What does it cover?

A: It covers the test principle, basic apparatus (including the use of a Nessler cylinder as a visual reference), observation conditions (black background, side illumination), sample handling and the interpretation of opalescence as an indicator of non‑miscibility or contamination.

Q: Who typically uses it?

A: Quality-control analysts in ethanol manufacturing, industrial users who require miscible ethanol, testing laboratories, inspection bodies and regulators performing routine checks on supplied ethanol batches.

Q: Is it current or superseded?

A: The standard was published on 1 November 1981. It has been periodically reviewed by ISO and was confirmed following review; it remains the published method for this specific test within the ISO 1388 series. Users should check with the official standards body for any national adoptions or later amendments.

Q: Is it part of a series?

A: Yes — it is one part of the ISO 1388 series, which contains multiple parts describing different test methods for ethanol for industrial use. The series replaced the earlier ISO/R 1388:1970 recommendation.

Q: What are the key keywords?

A: Ethanol, miscibility, water, opalescence, Nessler cylinder, visual test, industrial ethanol, quality control, ISO 1388.