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BS EN ISO 489:1999

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Plastics. Determination of refractive index
Available format(s)

Hardcopy , PDF

Superseded date

10-05-2022

Language(s)

English

Published date

15-10-1999

1 Scope
2 Normative references
3 Apparatus and materials
      3.1 Method A
      3.2 Method B
4 Preparation of test specimens
      4.1 Method A
      4.2 Method B
      4.3 Required number of specimens or measurements
5 Conditioning
6 Procedure
      6.1 Method A
      6.2 Method B
7 Precision
8 Test report

Defines two test methods for determining the refractive index of plastics, namely: - Method A: a refractometric method for measuring the refractive index of moulded parts, cast or extruded sheet or film, by means of a refractometer. - Method B: an immersion method (making use of the Becke line phenomenon) for determining the refractive index of powdered or granulated transparent materials by means of a microscope.

This International Standard specifies two test methods for determining the refractive index of plastics, namely:

  • Method A: a refractometric method for measuring the refractive index of moulded parts, cast or extruded sheet or film, by means of a refractometer. It is applicable not only to isotropic transparent, translucent, coloured or opaque materials but also to anisotropic materials. The method is recommended when great accuracy is required. It is not applicable to powdered or granulated material.

  • Method B: an immersion method (making use of the Becke line phenomenon) for determining the refractive index of powdered or granulated transparent materials by means of a microscope. Monochromatic light should, in general, be used to avoid dispersion effects. The accuracy of this method is about the same as that of method A. It is applicable to isotropic translucent, coloured materials but is not applicable to opaque materials nor to anisotropic materials.

NOTE 1 The refractive index is a fundamental property which can be used for checking purity and composition, for the identification of materials and for the design of optical parts. The change in refractive index with temperature may give an indication of transition points of materials.

NOTE 2 The accuracy of method B is approximately the same as that of method A when an experienced operator uses the method with extreme care (see clause 7).

Committee
PRI/21
DevelopmentNote
Also numbered as BS 2782-5.531A(1999) (09/1999) Supersedes BS 2782-5.531A(1992) and 97/123621 DC. (10/2005)
DocumentType
Standard
Pages
20
PublisherName
British Standards Institution
Status
Superseded
SupersededBy
Supersedes

Standards Relationship
ISO 489:1999 Identical
I.S. EN ISO 489:1999 Identical
UNI EN ISO 489 : 2001 Identical
NF EN ISO 489 : 1999 Identical
SN EN ISO 489 : 1999 Identical
EN ISO 489:1999 Identical
NS EN ISO 489 : 1ED 1999 Identical
NEN EN ISO 489 : 1999 Identical
UNE-EN ISO 489:2000 Identical
NBN EN ISO 489 : 1ED 99 Identical

ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO 5725-3:1994 Accuracy (trueness and precision) of measurement methods and results — Part 3: Intermediate measures of the precision of a standard measurement method
ISO 291:2008 Plastics Standard atmospheres for conditioning and testing
ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
EN ISO 291:2008 Plastics - Standard atmospheres for conditioning and testing (ISO 291:2008)

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