ISO 4650:2012 PDF

Rubber — Identification — Infrared spectrometric methods

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Title (English):

ISO 4650:2012

Rubber — Identification — Infrared spectrometric methods

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 88
Publication date:: December 6, 2012
Edition:: ISO IS 4650 edition 3 version 1
ICS:: 83.060

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Description (English):

ISO 4650:2012 specifies two methods for the identification of rubbers, including thermoplastic elastomers, either in the raw state or in the form of vulcanized or unvulcanized mixes. The first method is based on infrared spectrometric examination using the transmission technique. The second method makes use of analysis by reflectance. A comparison of the spectra resulting from reflectance (attenuated total reflectance, ATR) and transmission (film) is given. Both methods comprise examination of polymers by their pyrolysis products (pyrolysates), or by films cast from solution or obtained by moulding (for raw rubbers only). Typical spectra are given. The methods specified are qualitative methods only.

Technical details

Technical committee: ISO/TC 45/SC 2 - Testing and analysis
SKU: ISO 4650:2012

Abstract

Overview

ISO 4650:2012 - Rubber - Identification - Infrared spectrometric methods specifies two qualitative infrared (IR) techniques for identifying rubbers and thermoplastic elastomers in raw, vulcanized or unvulcanized forms. The standard covers transmission (film) spectroscopy and reflectance (ATR - attenuated total reflectance) analysis, including examination of polymers via pyrolysis products (pyrolysates) or films cast/moulded from solution. Typical reference spectra and diagnostic absorption tables are provided to support interpretation.

Key topics and technical requirements

Two approved methods: transmission technique (films or pyrolysates) and ATR reflectance (surface analysis).
Sample types: raw polymers, vulcanizates, unvulcanized mixes, thermoplastic elastomers.
Pyrolysis option: temperature-controlled pyrolysis in N2 with recommended temperature range (525 °C ± 50 °C; 475 °C advised for some rubbers) to collect pyrolysates for IR analysis.
Spectral scope and instrumentation: IR spectrometer (FTIR or dispersive) covering 4000–600 cm⁻¹ with spectral resolution of 4 cm⁻¹ or better; ATR crystals (diamond, ZnSe, Ge) and polished KBr plates for transmission.
Sample preparation: extraction of soluble components (per ISO 1407), dissolution in solvents (chloroform or 1,2-dichlorobenzene) and film casting; common extraction solvents include methanol and acetone.
Interpretation: comparison with reference spectra (Annex B); methods are qualitative only.
Limitations and exceptions: difficulty resolving minor blend components (typically

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Two approved methods: transmission technique (films or pyrolysates) and ATR reflectance (surface analysis).
Sample types: raw polymers, vulcanizates, unvulcanized mixes, thermoplastic elastomers.
Pyrolysis option: temperature-controlled pyrolysis in N2 with recommended temperature range (525 °C ± 50 °C; 475 °C advised for some rubbers) to collect pyrolysates for IR analysis.
Spectral scope and instrumentation: IR spectrometer (FTIR or dispersive) covering 4000–600 cm⁻¹ with spectral resolution of 4 cm⁻¹ or better; ATR crystals (diamond, ZnSe, Ge) and polished KBr plates for transmission.
Sample preparation: extraction of soluble components (per ISO 1407), dissolution in solvents (chloroform or 1,2-dichlorobenzene) and film casting; common extraction solvents include methanol and acetone.
Interpretation: comparison with reference spectra (Annex B); methods are qualitative only.
Limitations and exceptions: difficulty resolving minor blend components (typically

ISO 4650:2012 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

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