ISO 585:1990

Name: ISO 585:1990 — Plastics — Unplasticized cellulose acetate — Determination of moisture content
SKU: ISO 585:1990
Price: 25 EUR
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Plastics — Unplasticized cellulose acetate — Determination of moisture content

Название (английский):

ISO 585:1990

Plastics — Unplasticized cellulose acetate — Determination of moisture content

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 1
Дата публикации:: 13 декабря 1990 г.
Издание:: ISO IS 585 edition 2 version 1
ICS:: 83.080.20

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Описание (английский):

This determination may be required for the calculation of the dry mass used in analytical methods. Applies only to products with a moisture content of not more than 10 %. The principle consists in drying a test portion at 105 ° centigrade in a thermostatic oven, then weighing. The moisture content is calculated from the loss of mass of the test portion. Cancels and replaces the first edition ISO 585:1982, of which it constitutes a minor revision.

Abstract

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Overview

ISO 585:1990 defines a gravimetric method for the determination of moisture content in unplasticized cellulose acetate. The method is intended for materials with moisture content not exceeding 10% and is commonly used to obtain the dry mass required for analytical methods and quality control.

The principle is simple and robust: a test portion is dried in a thermostatic oven at 105 °C, then weighed. The moisture content is calculated from the loss of mass.

Key Topics

Scope: Applies only to unplasticized cellulose acetate having moisture ≤ 10%.

Principle: Drying at 105 °C and mass loss measurement to determine moisture content.

Apparatus: glass weighing bottle with ground-glass lid, desiccator with anhydrous calcium chloride, oven capable of 105 °C ± 2 °C, balance accurate to 1 mg.

Sample size and handling: approximately 5 g test portion weighed to 1 mg precision in a pre-dried weighing bottle.

Drying conditions: test portion (lid removed) placed in oven at 105 °C ± 2 °C for 3 hours, then cooled in a desiccator and reweighed to nearest 1 mg.

Repeatability: Carry out two determinations. If difference between the two moisture percentages > 0.1%, repeat the test. Take the mean of two acceptable determinations.

Calculation: Moisture content (%) = (m1 - m2) / m1 × 100, where m1 is mass before drying and m2 after drying.

Precision: Interlaboratory precision data are not available; the method's precision is therefore not established for disputed results or formal specifications.

Applications

This standard is primarily applied where accurate knowledge of dry mass is required, including:

Preparation and interpretation of analytical test results that depend on dry-mass basis.

Quality control of unplasticized cellulose acetate raw materials and intermediate products.

Routine laboratory moisture checks to verify storage and handling conditions.

Practical benefits include a straightforward procedure requiring standard laboratory equipment and clear acceptance criteria for repeatability between determinations.

Related Standards

Look for other ISO methods describing moisture determination for different plastics or for plasticized grades; applicability and drying conditions can differ.

Consult laboratory and safety standards for handling heated ovens, desiccants, and combustible fines; the standard includes a general safety warning.

Note: Follow the test report requirements specified by ISO 585:1990 - include reference to the standard, full product identification (physical form), and the percentage moisture content determined. The method is a minor revision of the original 1982 edition and cancels that edition.

ISO 585:1990

Abstract

Похожие стандарты

Overview

Key Topics

Applications

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