EN ISO 75-2:2013

• Abstract:

  ISO 75-2:2013 specifies three methods, using different values of constant flexural stress, which can be used for the determination of the temperature of deflection under load of plastics (including filled plastics and fibre-reinforced plastics in which the fibre length, prior to processing, is up to 7,5 mm) and ebonite:; method A, using a flexural stress of 1,80 MPa;; method B, using a flexural stress of 0,45 MPa;; method C, using a flexural stress of 8,00 MPa.

• Status: Published
• Publication Date: 16-Apr-2013
• Withdrawal Date: 30-Oct-2013
• ICS: 83.060 - Rubber
• ICS: 83.080.01 - Plastics in general
• ICS: 83.080.10 - Thermosetting materials
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249 - Plastics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 17-Apr-2013
• Completion Date: 17-Apr-2013
• Ref Project: SIST EN ISO 75-2:2013 - Plastics - Determination of temperature of deflection under load - Part 2: Plastics and ebonite (ISO 75-2:2013)

• Replaces: EN ISO 75-2:2004 - Plastics - Determination of temperature of deflection under load - Part 2: Plastics, ebonite and long-fibre-reinforced composites (ISO 75-2:2004)
• Effective Date: 24-Apr-2013
• Replaces: EN ISO 75-2:2004/AC:2006 - Plastics - Determination of temperature of deflection under load - Part 2: Plastics and ebonite (ISO 75-2:2004)
• Effective Date: 24-Apr-2013
• Refers: ISO 10724-1:1998 - Plastics — Injection moulding of test specimens of thermosetting powder moulding compounds (PMCs) — Part 1: General principles and moulding of multipurpose test specimens
• Effective Date: 25-Aug-2026
• Refers: ISO 2818:1994 - Plastics — Preparation of test specimens by machining
• Effective Date: 25-Aug-2026
• Refers: ISO 294-1:1996 - Plastics — Injection moulding of test specimens of thermoplastic materials — Part 1: General principles, and moulding of multipurpose and bar test specimens
• Effective Date: 25-Aug-2026
• Refers: ISO 20753:2008 - Plastics — Test specimens
• Effective Date: 25-Aug-2026
• Refers: ISO 293:2004 - Plastics — Compression moulding of test specimens of thermoplastic materials
• Effective Date: 25-Aug-2026
• Refers: ISO 75-1:2013 - Plastics — Determination of temperature of deflection under load — Part 1: General test method
• Effective Date: 09-Feb-2026
• Refers: EN 12248:1999 - Sawn timber used in industrial packaging - Permitted deviations and preferential sizes
• Effective Date: 28-Jan-2026
• Refers: prEN ISO 20876 - Footwear - Test methods for insoles - Resistance to stitch tear
• Effective Date: 28-Jan-2026
• Referred By: EN 62052-31:2016 - Electricity metering equipment (AC) - General requirements, tests and test conditions - Part 31: Product safety requirements and tests
• Effective Date: 09-Feb-2026
• Referred By: EN IEC 60455-2:2023 - Resin based reactive compounds used for electrical insulation - Part 2: Methods of test
• Effective Date: 09-Feb-2026
• Referred By: EN IEC 62052-31:2024 - Electricity metering equipment - General requirements, tests and test conditions - Part 31: Product safety requirements and tests
• Effective Date: 09-Feb-2026
• Referred By: EN 13677-2:2003 - Reinforced thermoplastic moulding compounds - Specification for GMT - Part 2: Methods of test and general requirements
• Effective Date: 28-Jan-2026
• Referred By: EN 16245-2:2013 - Fibre-reinforced plastic composites - Declaration of raw material characteristics - Part 2: Specific requirements for resin, curing systems, additives and modifiers
• Effective Date: 28-Jan-2026

Overview

EN ISO 75-2:2013 - "Plastics - Determination of temperature of deflection under load - Part 2: Plastics and ebonite" is the CEN-adopted version of ISO 75-2:2013. It specifies laboratory methods to determine the temperature of deflection under load (commonly called heat deflection temperature or HDT) for plastics (including filled and short-fibre reinforced plastics with fibre length ≤ 7.5 mm) and ebonite. The standard defines test conditions, specimen requirements and measurement procedures for three constant flexural stress levels.

Key topics and technical requirements

• Three test methods (constant flexural stress):
  • Method A: 1.80 MPa
  • Method B: 0.45 MPa
  • Method C: 8.00 MPa
• Test geometry and span: The recommended support span is 64 ± 1 mm. Common specimen format used in the standard is 80 mm × 10 mm (thickness as specified in the table within the standard).
• Heating and equipment: Heating methods follow ISO 75‑1 (general methods). Modern accepted heat-transfer techniques include oil baths, air ovens and fluidized‑bed systems - fluidized-bed/air ovens are noted for high-temperature stability.
• Measurement principle: A constant flexural stress is applied and the temperature at which the specimen’s deflection reaches a specified (standard) deflection is recorded as the temperature of deflection under load.
• Material considerations: Better reproducibility is typically achieved with amorphous plastics than semi-crystalline ones. Annealing of specimens may be required to reduce variability caused by moulding conditions.
• Quality control: The standard defines repeat-testing rules when individual results exceed the reproducibility limits given in the document.

Practical applications

• Material selection and specification: compare temperature performance of candidate plastics and ebonite under load.
• Quality assurance and batch validation: verify that production materials meet specified thermal-mechanical performance.
• Design verification: assess suitability of housings, structural components, and load-bearing parts exposed to elevated temperatures.
• Supplier compliance and procurement: include EN ISO 75-2:2013 test data in technical datasheets and procurement specifications.

Who uses this standard

• Materials and polymer engineers
• Test laboratories and QA departments
• Product designers and R&D teams
• Plastics compounders, moulders and manufacturers of ebonite products
• Regulatory and compliance teams specifying thermal performance

Related standards

• ISO 75-1 - General test method for determination of temperature of deflection under load (heating methods and general principles)
• ISO standards for specimen preparation and moulding (referenced within EN ISO 75-2)

Keywords: EN ISO 75-2:2013, temperature of deflection under load, heat deflection temperature, plastics and ebonite, flexural stress, HDT, material testing, ISO 75-1.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kunststoffe - Bestimmung der Wärmeformbeständigkeitstemperatur - Teil 2: Kunststoffe und Hartgummi (ISO 75-2:2013)Plastiques - Détermination de la température de fléchissement sous charge - Partie 2: Plastiques et ébonite (ISO 75-2:2013)Plastics - Determination of temperature of deflection under load - Part 2: Plastics and ebonite (ISO 75-2:2013)83.080.01Polimerni materiali na splošnoPlastics in generalICS:Ta slovenski standard je istoveten z:EN ISO 75-2:2013SIST EN ISO 75-2:2013en,fr,de01-december-2013SIST EN ISO 75-2:2013SLOVENSKI
STANDARDSIST EN ISO 75-2:2004/AC:2006SIST EN ISO 75-2:20041DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN ISO 75-2
April 2013 ICS 83.080.10 Supersedes EN ISO 75-2:2004English Version
Plastics - Determination of temperature of deflection under load - Part 2: Plastics and ebonite (ISO 75-2:2013)
Plastiques - Détermination de la température de fléchissement sous charge - Partie 2: Plastiques et ébonite (ISO 75-2:2013)
Kunststoffe - Bestimmung der Wärmeformbeständigkeitstemperatur - Teil 2: Kunststoffe und Hartgummi (ISO 75-2:2013) This European Standard was approved by CEN on 21 March 2013.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
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B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 75-2:2013: ESIST EN ISO 75-2:2013

Ôléchissement sous cPartie 2: Plastiques et éboniteINTERNATIONAL STANDARDISO75-2Third edition2013-04-15Reference numberISO 75-2:2013(E)SIST EN ISO 75-2:2013

ISO 75-2:2013(E) ii © ISO 2013 – All rights reservedCOPYRIGHT PROTECTED DOCUMENT©
ISO 2013All rights reservedä Unless otherwise speci Ðiedá no part of this publication may be reproduced or utilized otherwise in any form or by any meansá electronic or mechanicalá including photocopyingá or posting on the internet or an intranetá without prior written permissionä Permission can be requested from either ISO at the address below or ISOïs member body in the country of the requester.ISO copyright of ÐiceTel. + 41 22 749 01 11Fax + 41 22 749 09 47Eæmail copyright 7isoäorgWeb www.iso.orgPublished in SwitzerlandSIST EN ISO 75-2:2013

ISO 75-2:2013(E) © ISO 2013 – All rights reserved iiiContents PageForeword .ivIntroduction .v1 Scope .12 Normative references .1 u Terms and de Ðinitions .24 Principle .25 Apparatus .2 wä s Means of producing a
Ðlexural stress .2 wä t Heating equipment .25.3 Weights .25.4 Temperature-measuring instrument .2 wä w De Ðlectionæmeasuring instrument .26 Test specimens.2 xä s General .26.2 Shape and dimensions .26.3 Specimen inspection .36.4 Number of test specimens .36.5 Test-specimen preparation .36.6 Annealing .37 Conditioning .38 Procedure.38.1 Calculation of force to be applied.38.2 Initial temperature of the heating equipment .38.3 Measurement .39 Expression of results .410 Precision .411 Test report .4Annex A (informative) Precision .5Bibliography .9SIST EN ISO 75-2:2013

ISO 75-2:2013(E)Forewordthrough ISO technical committeesä 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 organizationsá governmental and nonægovernmentalá in liaison with ISOá also take part in the workä electrotechnical standardizationäirectivesá Part
täThe main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for votingä Publication as an International Standard requires approval by at least
y w
¨ of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rightsä ISO shall not be held responsible for identifying any or all such patent rightsäISO 75-2 was prepared by Technical Committee ISO/TC
x sá Plasticsá Subcommittee SC
tá Mechanical properties.revisedä In particulará Clause 5 and Annex A have been updated.ISO
y w consists of the following partsá under the general title
Determination of temperature of de Ôlection under load:— Part
wã General test method— Part
xã Plastics and ebonite— Part
yã Highæstrength thermosetting laminates and longæ Ôibreæreinforced plastics iv © ISO 2013 – All rights reservedSIST EN ISO 75-2:2013

ISO 75-2:2013(E)IntroductionThe
Ðirst editions of ISO
y wæ s and this part of ISOtest loads and two specimen positionsá edgewise and
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