ISO 3585:1998

Borosilicate glass 3.3 - Properties

Verre borosilicaté 3.3 — Propriétés

General Information

• Status: Published
• Publication Date: 24-Jun-1998
• ICS: 81.040.01 - Glass in general
• Technical Committee: ISO/TC 48 - Laboratory equipment
• Drafting Committee: ISO/TC 48 - Laboratory equipment
• Current Stage: 9060 - Close of review
• Completion Date: 04-Jun-2030

Relations

• Consolidated By: ISO/TS 15877-7:2009 - Plastics piping systems for hot and cold water installations - Chlorinated poly(vinyl chloride) (PVC-C) - Part 7: Guidance for the assessment of conformity
• Effective Date: 06-Jun-2022
• Revises: ISO 3585:1991 - Borosilicate glass 3.3 - Properties
• Effective Date: 15-Apr-2008

Overview

ISO 3585:1998 defines the properties of borosilicate glass 3.3, a specialized glass type widely used in laboratory glassware, industrial glass plant components, pipelines, and fittings. This international standard specifies the chemical resistance, physical, and mechanical properties that borosilicate glass 3.3 must fulfill to ensure reliability and safety in various practical applications. Recognized globally, ISO 3585 supports uniform quality and facilitates the identification of borosilicate glass types with consistent performance characteristics.

Key Topics

• Chemical Resistance:
  Borosilicate glass 3.3 demonstrates excellent resistance to chemical attack, assessed through standardized test methods including:

  • Hydrolytic resistance at 98 °C and 121 °C (ISO 719 and ISO 720).
  • Acid resistance measured by sodium oxide mass loss (referencing ISO 1776).
  • Resistance to mixed alkali attack (ISO 695).

• Thermal Properties:
  Thermal performance is critical for applications involving temperature variations. Key parameters include:

  • Coefficient of mean linear thermal expansion: (3.3 ± 0.1) × 10⁻⁶ K⁻¹ between 20 °C and 300 °C (ISO 7991).
  • Transformation temperature (annealing point) approximately 525 °C.
  • Viscosity-temperature relationship crucial for glass forming and shaping, determined through rotation, fibre elongation, and beam bending viscometers.

• Mechanical Properties:
  Borosilicate glass 3.3's mechanical strength ensures durability and reliability in laboratory and industrial settings. Notable properties include:

  • Modulus of elasticity: 64 kN/mm² (64 GPa).
  • Poisson's ratio: 0.20.
  • Ultimate tensile strength ranges from 35 MPa to 100 MPa, acknowledging variability due to surface conditions and manufacturing processes.

• Physical Characteristics:
  Physical properties guide proper material selection:

  • Density around 2.23 g/cm³ at 20 °C.
  • Specific heat capacity approximates 0.8 kJ/kg·K (20 °C to 100 °C).
  • Mean thermal conductivity is approximately 1.2 W/(m·K) (20 °C to 200 °C).

Applications

ISO 3585 borosilicate glass 3.3 is designed primarily for:

• Laboratory Glassware: Beakers, flasks, tubes, and other devices requiring thermal and chemical durability.
• Glass Plant Components: Including pipeline segments and fittings that must withstand corrosive chemicals and thermal stress.
• Industrial Equipment: Used in chemical processing, pharmaceutical, and food industries where inert materials with excellent heat resistance are required.

The standard assists manufacturers, engineers, and quality assurance professionals in selecting appropriate glass materials for products exposed to harsh thermal and chemical environments.

Related Standards

ISO 3585 references and should be considered together with these related International Standards to ensure comprehensive quality and compatibility:

• ISO 719: Hydrolytic resistance of glass grains at 98 °C.
• ISO 720: Hydrolytic resistance at 121 °C.
• ISO 695: Resistance to boiling aqueous solutions of mixed alkali.
• ISO 1776: Acid resistance testing of glass materials.
• ISO 7991: Measurement of the coefficient of mean linear thermal expansion.
• ISO 7884 series: Viscosity and viscometric fixed points, including methods of viscosity determination.
• ISO 3586 & ISO 3587: Related to glass plant pipeline testing and compatibility.
• ISO 3819, 4797, and 4803: Standards covering laboratory glassware specifications and components.

Summary

ISO 3585:1998 is essential for defining the stringent chemical, thermal, and mechanical performance requirements of borosilicate glass 3.3. Its adoption ensures that borosilicate glass used in laboratory and industrial applications meets internationally recognized criteria for durability, safety, and functionality. By adhering to this standard, manufacturers can provide products with predictable performance in challenging environments involving thermal cycling and chemical exposure. This standard therefore underpins the quality assurance of critical glass materials in scientific and industrial fields.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 3585
Third edition
1998-07-01
Borosilicate glass 3.3 — Properties
Verre borosilicaté 3.3 — Propriétés
A
Reference number
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. Each 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, governmental 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 International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 3585 was prepared by Technical Committee
ISO/TC 48, Laboratory glassware and related apparatus, Subcommittee 5,
Quality of glassware.
This third edition cancels and replaces the second edition (ISO 3585:1991),
which has been technically revised.
Annex A of this International Standard is for information only.
©  ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii
©
ISO ISO 3585:1998(E)
Introduction
It is the purpose of this International Standard to define and facilitate the
identification of a type of glass appropriate for laboratory glassware, glass
plant, pipeline and fittings.
The design of glass components is dependent on the coefficient of mean
linear thermal expansion and the ultimate tensile strength. Utilization
requires not only a product design which is satisfactory within temperature
and pressure limitations, but one which will also satisfy certain criteria for
chemical resistance.
Therefore, the glass, as distinct from the components made from it, shall
satisfy certain specified requirements. However, it is accepted that
methods of working the glass to achieve the various forms required in
practice can affect the properties of the glass.
The glass used for this application, referred to as “borosilicate glass 3.3”, is
resistant to both heat and chemicals. Its heat resistance characteristics are
defined by the nominal values given for physical properties. Its chemical
resistance characteristics are specified within stated limits, using standard
test methods to which reference is made in this International Standard.
The glass is deemed to be satisfactory for the construction of laboratory
glassware, glass plant, pipeline and fittings, while for the glass components
themselves, other relevant International Standards should be consulted.
Where nominal properties are given, they relate, unless otherwise
specified, to the range of temperatures of 20 �C to 300 �C. However, this
does not imply that products manufactured from this glass can necessarily
be used freely within this range, nor that they cannot be used outside this
range.
iii
©
INTERNATIONAL STANDARD  ISO ISO 3585:1998(E)
Borosilicate glass 3.3 — Properties
1  Scope
This International Standard specifies the characteristics of a type of glass designated “borosilicate glass 3.3” used
for the construction of laboratory glassware, glass plant, pipeline and fittings.
NOTE —  Annex A lists related International Standards.
2  Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
ISO 695:1991, Glass — Resistance to attack by a boiling aqueous solution of mixed alkali — Method of test and
classification.
ISO 719:1985, Glass — Hydrolytic resistance of glass grains at 98 �C — Method of test and classification.
ISO 720:1985, Glass — Hydrolytic resistance of glass grains at 121 �C — Method of test and classification.
ISO 1776:1985, Glass — Resistance to attack by hydrochloric acid at 100 �C — Flame emission or flame atomic
absorption spectrometric method.
ISO 7884-2:1987, Glass — Viscosity and viscometri
...