ISO 1183-2:2019 PDF
Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient column method
Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient column method
- Статус документа:
- Отменён
- Формат:
- Электронный (PDF)
- Количество страниц:
- 11
- Дата публикации:
- 28 февраля 2019 г.
- Издание:
- ISO IS 1183 edition 2 version 1
- ICS:
- 83.080.01
This document specifies a gradient column method for the determination of the density of non-cellular moulded or extruded plastics or pellets in void-free form. Density gradient columns are columns containing a mixture of two liquids, the density in the column increasing uniformly from top to bottom. NOTE Density is frequently used to follow variations in physical structure or composition of plastic materials. Density can also be useful in assessing the uniformity of samples or specimens. The density of plastic materials can depend upon the choice of specimen preparation method. When this is the case, precise details of the specimen preparation method are intended to be included in the appropriate material specification.
Abstract
Overview
ISO 1183-2:2019 specifies the density gradient column method for determining the density of non-cellular, void‑free moulded or extruded plastics and pellets. The standard describes use of a vertical column filled with a continuous density gradient (mixture of two miscible liquids) in which test specimens settle to the level matching their density. Density is an important tracer of composition, physical structure and uniformity in polymer materials.
Key topics and requirements
- Scope: Applicable to non‑cellular plastics (moulded, extruded or pellet forms) in void‑free condition.
- Apparatus:
- Density gradient column (typical diameter ≥ 40 mm) with a readable scale (1 mm graduation is normal).
- Thermostatically controlled liquid bath (temperature control to ±0.1 °C or ±0.5 °C depending on required sensitivity).
- Calibrated glass floats (approximately spherical, ≤ 5 mm diameter) spanning the measurement range.
- High‑precision balance (≈ ±0.1 mg) and filling devices (siphon/pipette).
- Immersion liquids: Two miscible liquids of different densities are mixed to form the gradient. Annex A lists example systems (e.g., methanol/benzyl alcohol, isopropanol/water, water/sodium bromide, ethanol/zinc chloride). Some liquids can be hazardous - observe safety precautions.
- Specimen preparation: Pieces should be smooth, free from cavities and sized to allow accurate location of the specimen centre. Thin films (
Технические детали
- Технический комитет
- ISO/TC 61/SC 5 - Physical-chemical properties
- SKU
- ISO 1183-2:2019
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