SIST EN ISO 1599:2000

Plastics - Cellulose acetate - Determination of viscosity loss on moulding (ISO 1599:1990)

This method is suitable for cellulose acetate which does not contain additives, fillers, etc. which may interfere with the determination of viscosity. It is suitable for cellulose acetate having an acetic acid yield above 50 %. Cellulose acetate plasticized with dimethyl phthalate is moulded under specified conditions of temperature, pressure and time. After cooling, the moulding is ground up. The viscosity ratio of the ground material from the moulding and also that of the original cellulose acetate material are determined in accordance with ISO 1157. The percentage viscosity loss is calculated from the values of viscosity before and after moulding. This second edition cancels and replaces the first edition ISO 1599:1975.

Kunststoffe - Celluloseacetat - Bestimmung des Viskositätsverlustes beim Formen (ISO 1599:1990)

Diese Internationale Norm legt ein Verfahren zur Bestimmung des Viskositäts- verlustes fest, der bei der Verformung von Celluloseacetat auftritt. Der Viskositätsverlust beim Formen hängt mit der Depolymerisation des Celluloseacetats zusammen, die im allgemeinen die Sprödigkeit des verformten Produktes erhöht. Dieses Verfahren ist für Celluloseacetat geeignet, das keineZusatzstoffe, Füllstoffe usw. enthält, die die Bestimmung der Viskosität beeinträchtigen können. Es ist für Celluloseacetat mit einem Essigsäuregehalt von mindestens 50% geeignet.

Plastiques - Acétate de cellulose - Détermination de la perte de viscosité au moulage (ISO 1599:1990)

La présente Norme internationale prescrit une méthode pour la détermination de la diminution de viscosité qui se produit lors du moulage de l'acétate de cellulose. Cette perte de viscosité au moulage est due à une dépolymérisation de l'acétate de cellulose, et augmente généralement la fragilité de l'objet moulé.  La méthode est applicable aux acétates de cellulose qui ne contiennent pas d'additifs, charges, etc., susceptibles de perturber la détermination de la viscosité.  Elle convient aux acétates de cellulose ayant un titre en acide acétique supérieur à 50 %.

Polimerni materiali - Acetat celuloze - Določanje znižanja viskoznosti pri oblikovanju s stiskanjem (ISO 1599:1990)

General Information

• Status: Published
• Publication Date: 30-Apr-2000
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-2000
• Due Date: 01-May-2000
• Completion Date: 01-May-2000
• Ref Project: EN ISO 1599:1999 - Plastics - Cellulose acetate - Determination of viscosity loss on moulding (ISO 1599:1990)

Relations

• Replaces: SIST ISO 1599:1996 - Plastics -- Cellulose acetate -- Determination of viscosity loss on moulding
• Effective Date: 01-May-2000

Overview

EN ISO 1599:1999 (ISO 1599:1990) defines a laboratory method for measuring viscosity loss on moulding of cellulose acetate plastics. The procedure quantifies polymer depolymerization that can occur during thermal moulding - a change that commonly increases brittleness in finished parts. The test is applicable only to cellulose acetate that is essentially free of additives or fillers and has an acetic acid yield > 50%. The material is plasticized with dimethyl phthalate, moulded under defined temperature, pressure and time, then ground and analysed. Viscosity ratios before and after moulding are determined according to ISO 1157 and used to calculate percentage viscosity loss.

Key topics and technical requirements

• Scope limits: Suitable only for cellulose acetate without interfering additives/fillers and with acetic acid yield above 50%.
• Plasticizer: Dimethyl phthalate is used in the moulding formulation.
• Moulding conditions: Specified preheat and mould temperatures, contact and full pressure stages; full pressure ≥ 8 MN/m² on the moulding surface; moulding time varies with thickness.
• Sample preparation: Two accepted methods for incorporating plasticizer; sample moisture must be low (≤ 0.5%) to avoid defects. For some methods the powder must pass a 710 µm sieve.
• Post-mould processing: Cool under controlled conditions, grind moulded specimens to < 0.9 mm, and dry (typically 70 °C for 2 h).
• Viscosity measurement: Use solvents and procedures of ISO 1157 (viscosity number and ratio). Solutions of original and moulded material are prepared and flow times measured.
• Result expression: Percentage viscosity loss = 100 × (Yr,a – Yr,b) / Yr,a, where Yr,a is the original viscosity ratio and Yr,b after moulding. Report is the mean of two valid determinations; if they differ by >10% of the mean, perform two additional determinations.
• Limits: Precision (inter-laboratory) not established - caution advised for contractual/specification use.
• Safety: Procedure uses flammable solvents (propan-2-ol, dichloromethane) and requires appropriate safety controls.

Practical applications

• Quality control of cellulose acetate resins and moulded parts to detect thermal degradation.
• Process optimization and troubleshooting for injection or compression moulding of cellulose acetate formulations.
• R&D for formulation screening (e.g., evaluating processing stability or selecting suitable plasticizers).
• Acceptance testing when ensuring batch-to-batch consistency for medical, consumer or optical cellulose acetate components.

Who uses this standard

• Materials testing laboratories and QC departments in plastics manufacturing.
• Compounders and formulators working with cellulose acetate.
• R&D teams evaluating thermal stability and processing windows.
• Certification bodies and technical experts performing product assessments.

Related standards

• ISO 1157 - Plastics: Cellulose acetate in dilute solution - determination of viscosity number and viscosity ratio (used for viscosity measurements).
• ISO 585 - Determination of moisture content.
• ISO 565 - Test sieves (mesh size references).

Keywords: EN ISO 1599:1999, ISO 1599:1990, cellulose acetate, viscosity loss on moulding, dimethyl phthalate, viscosity ratio, ISO 1157, plastics testing.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2000
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REOLNRYDQMXVVWLVNDQMHP,62
Plastics - Cellulose acetate - Determination of viscosity loss on moulding (ISO
1599:1990)
Kunststoffe - Celluloseacetat - Bestimmung des Viskositätsverlustes beim Formen (ISO
1599:1990)
Plastiques - Acétate de cellulose - Détermination de la perte de viscosité au moulage
(ISO 1599:1990)
Ta slovenski standard je istoveten z: EN ISO 1599:1999
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

ISO
INTERNATIONAL
STANDARD 1599
Second edition
1990- 12-0 1
Plastics - Cellulose acetate - Determination
of viscosity loss on moulding
Plastiques - Acetate de cellulose - Determination de la perte de
viscosite au moulage
Reference number
ISO 1599:1990(E)
ISO 1599:1990(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national Standards bodies (ISO member bodies). The work
of preparing International Standards is normally carried out through ISO
technical committees. Esch member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations, govern-
mental and non-governmental, in liaison with ISO, also take part in the
work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an Inter-
national Standard requires approval by at least 75 % of the member
bodies casting a vote.
International Standard ISO 1599 was prepared by Technical Committee
ISO/TC 61, Plastics.
This second edition cancels and replaces the first edition
(ISO 1599:1975), of which it constitutes a minor revision.
0 ISO 1990
All rights reserved. No part of this publication may be reproduced or utilized in any form
or by any means, electronie or mechanical, including photocopying and microfilm, without
Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ii
ISO 1599:1990(E)
INTERNATIONAL STANDARD
Plastics - Cellulose acetate - Determination of viscosity loss
on moulding
WARNING - The use of this International Standard may involve hazardous materials, operations and
equipment. This Standard does not purport to address all of the safety Problems associated with its use.
lt is the responsibility of the user of this Standard to establish appropriate safety and health practices
and determine the applicability of regulatory limitations Prior to use.
ISO 1157: 1990, Plastics - Cellulose acefate in dilute
1 Scope
solution - Determination of viscosity number and
viscosity ratio-
This International Standard specifies a method for
the determination of the reduction in viscosity which
occurs when cellulose acetate is moulded. The vis-
3 Principle
cosity loss on moulding is related to the
depolymerization of cellulose acetate, which gener-
Cellulose acetate plasticized with dimethyl phthalate
ally increases brittleness in the moulded product.
is moulded under specifred conditions of tempera-
This method is suitable for cellulose acetate which ture, pressure and time. After cooling, the moulding
does not contain additives, fillers, etc., which may is ground up. The viscosity ratio of the ground ma-
interfere with the determination of viscosity.
terial from the moulding and also that of the original
cellulose acetate are determined in accordance with
lt is suitable for cellulose acetate having an acetic
ISO 1157. The percentage viscosity loss is calcu-
acid yield above 50 %.
lated from the values of viscosity before and after
moulding.
NOTE 1 Since the moulded cellulose acetate contains
2 Normative references
dimethyl phthalate, this is also present in the Solution for
viscosity measurement; the Solution of original cellulose
acetate does not contain dimethyl phthalate. However, the
The following Standards contain provisions which,
concentration of dimethyl phthalate in the Solution for
through reference in this text, constitute provisions
viscosity measurement is too small to have any significant
of this International Standard. At the time of publi-
effect on viscosity.
cation, the editions indicated were valid. All stan-
dards are subject to revision, and Parties to
agreements based on this International Standard
4 Reagents
are encouraged to investigate the possibility of ap-
plying the most recent editions of the Standards in-
During the determination, use only reagents of rec-
dicated below. Members of IEC and ISO maintain
ognized analytical grade.
registers of currently valid International Standards.
ISO 565:1990, Test sieves - Metal wire cloth, perfo-
4.1 Dimethyl phthalate, analytical grade, &i 1,191
rated metal plate and electroformed sheet - Nominal
to 1,195, purity more than 99 % (m/m).
sizes of openings.
ISO 585:l 9901), Plastics - Unplasticized cellulose 4.2 Solvents for viscosity ratio determination, as
specified in ISO 1157.
acetate - Determination of moisture content.
1) To be published.
ISO 1599:1990(E)
at least 5 min after all the dimethyl phthalate has
4.3 Propan-2-01.
been added. Proceed in accordance with 7.2 to 7.8.
SAFETY PRECAUTIONS - Propan-2-01 is highly
flammable. Keep the Container tightly closed and
7.1.2 Second method
away from sources of ignition. DO not smoke.
Place 200 g, weighed to the nearest 1 g, of the
cellulose acetate in a 2 Iitre v
...