ISO 1628-4:1999 PDF

Name: ISO 1628-4:1999 — Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers — Part 4: Polycarbonate (PC) moulding and extrusion materials
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Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers — Part 4: Polycarbonate (PC) moulding and extrusion materials

Название (английский):

ISO 1628-4:1999

Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers — Part 4: Polycarbonate (PC) moulding and extrusion materials

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 11 марта 1999 г.
Издание:: ISO IS 1628 edition 2 version 1
ICS:: 83.080.20

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Описание (английский):

This part of ISO 1628 describes the conditions necessary for the determination of the viscosity number (also known as the reduced viscosity) and the relative viscosity of polycarbonates in dilute solution. It can be used for pure polycarbonates and blends with other polymers, as well as mixtures of both, with or without fillers, as defined in ISO 7391-1.

Abstract

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Стандарты, упомянутые в описании

Overview

ISO 1628-4:1999 specifies a standardized method for determining the viscosity number (VN) and relative viscosity of polycarbonate (PC) moulding and extrusion materials in dilute solution using capillary viscometers. The procedure covers pure polycarbonates, blends with other polymers and mixtures, with or without fillers, and defines required test conditions, sample preparation, measurement and calculation methods. Key outcome units include viscosity number expressed in ml·g⁻¹ and dimensionless relative viscosity.

Key topics and technical requirements

Test concentration and solvent: Polycarbonate solutions are prepared at 5 g·l⁻¹ using dichloromethane (analytical grade) or equivalent.

Measurement temperature: All measurements are made at 25 °C ± 0.1 °C in a thermostatic bath.

Viscometer specification: Preferred apparatus is an Ubbelohde capillary viscometer (size 0C, 0.36 mm capillary, 2 ml receiver) per ISO 3105; other validated viscometers or automatic devices may be used if equivalent results are obtained.

Timing and accuracy: Timing devices must meet specified resolution and accuracy (e.g., read to 0.1 s and accurate to –0.1 %; higher precision for automatic systems). Solvent efflux times must be repeatable within 0.2 %.

Kinetic-energy correction: The standard requires consideration of the Dt kinetic-energy correction for efflux time; inclusion is necessary for accurate VN with specified capillaries.

Sample handling: Procedures for non-reinforced, pigmented, or glass-fibre‑reinforced materials are given - including filtration, use of filter aid or centrifugation, evaporation and re-dissolution of the polymer film; drying oven set at 110 °C.

Calibration and validation: Annex A details instrument calibration and verification using reference liquids and certified polycarbonate standards; acceptable deviation vs. reference is specified (≤ 0.4 %).

Practical applications

Quality control and specification of PC resins for injection moulding and extrusion.

Raw‑material verification for polymer producers, compounders and converters.

Supporting product compliance, batch-to-batch consistency checks and formulation development where molecular weight proxies (via VN) are used.

Research labs assessing effects of additives, blending or recycling on polymer chain length/viscosity.

Related standards

ISO 1628-1:1998 - General principles for dilute-solution viscometry

ISO 1628 (other parts) - Methods for PVC, PE/PP, polyesters, PMMA

ISO 3105 - Glass capillary viscometer specifications

ISO 7391-1 / -2 - Polycarbonate designation and test specimen preparation

Keywords: ISO 1628-4, viscosity number, VN, polycarbonate viscosity, capillary viscometer, Ubbelohde, dichloromethane, relative viscosity, polymer testing.

ISO 1628-4:1999 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications

Who should use this standard

Related standards

Технические детали

ISO 1628-1:1998

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SIST ISO 3105:1995

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ISO 7391-1:1996

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