ISO 1041:1973 PDF

Name: ISO 1041:1973 — Essential oils — Determination of freezing point
SKU: ISO 1041:1973
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Essential oils — Determination of freezing point

Название (английский):

ISO 1041:1973

Essential oils — Determination of freezing point

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 2
Дата публикации:: 1 декабря 1973 г.
Издание:: ISO IS 1041 edition 1 version 1
ICS:: 71.100.60

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Описание (английский):

The determination consists in slow and progressive cooling of the essential oil and observation of the variations in temperature as the oil passes from the liquid to the solid state. The apparatur for determination of freezing point consists of a wide-mouthed container of about 500 ml capacity, provided with a bored cork or rubber stopper into which a stout-walled test tube is inserted. Another smaller test tube is fitted into the stout-walled test tube by means of another bored cork or rubber stopper. Into the smaller test tube a thermometer is inserted.

Abstract

Похожие стандарты

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Overview

ISO 1041:1973 defines a laboratory method for the determination of the freezing point of essential oils by slow, progressive cooling and observation of temperature changes as the oil passes from liquid to solid. The method is intended for routine physical testing and quality control of essential oils, with a specified apparatus and repeatable procedure. Note: the standard does not apply to rose essential oil.

Key Topics

Principle: Controlled cooling of a small oil sample while recording temperature; identification of a maximum or a plateau in the temperature–time curve during latent heat release marks the freezing point.

Apparatus: A wide-mouthed container (~500 ml) with a bored cork or rubber stopper holds a stout-walled test tube. A smaller test tube is fitted inside the stout-walled tube; the thermometer is placed in the inner tube. A schematic device is provided in the standard.

Thermometer requirements: The thermometer must be calibrated and suitable to measure in the range from about –20 °C to +50 °C. Recommended reservoir dimensions are:

reservoir length: 10–20 mm
reservoir diameter: 5–6 mm
graduation: 0.1 °C (Thermometers should conform to the related ISO thermometer guidance.)

Test tube dimensions:

inner test tube (sample): ~20 mm diameter × 100 mm length
stout-walled outer tube: ~30 mm diameter × 125 mm length

Procedure summary:

Prepare a preliminary test: liquefy the oil if necessary, cool a few millilitres in a small tube and agitate until solidification to create a seed crystal and to record an initial temperature.
Fill the apparatus bath with ice and water or a suitable refrigerant to about 5 °C below the preliminary temperature.
Introduce 10 ml of the oil into the inner test tube with the thermometer centered in the liquid. Cool to the preliminary temperature, then insert the inner tube into the outer tube and wait for an additional 2 °C drop.
Initiate solidification with the seed crystal and agitate with the thermometer to avoid wall-adhering particles. Observe temperature closely until a maximum or a plateau lasting more than 1 minute is seen.
Repeat until two successive determinations differ by no more than 0.2 °C. The mean of the last two determinations is reported to 0.1 °C.

Expression of results: Final freezing point reported in °C to one decimal place.

Applications

Quality control and batch verification of essential oils

Specification compliance and physical property profiling

Laboratory testing where a reproducible freezing point measurement is required

Practical benefits include a standardized, repeatable approach to detect freezing/solidification behaviour and to support product specification limits.

Related Standards

ISO 212 - Essential oils - Sampling (reference for sampling practice)

ISO/R 356 - Essential oils - Test methods - Sample preparation

ISO/R 653 - Thermometer selection and requirements (referenced for thermometer performance)

For test reporting, ISO 1041:1973 requires inclusion of method reference, numeric results and their expression, details of any deviations or special operations, and any particular observations recorded during the test.

ISO 1041:1973 PDF

Abstract

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Overview

Key Topics

Applications

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