ISO 7781:2017 PDF

Name: ISO 7781:2017 — Styrene-butadiene rubber, raw — Determination of soap and organic-acid content
SKU: ISO 7781:2017
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Styrene-butadiene rubber, raw — Determination of soap and organic-acid content

Название (английский):

ISO 7781:2017

Styrene-butadiene rubber, raw — Determination of soap and organic-acid content

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 12
Дата публикации:: 16 ноября 2017 г.
Издание:: ISO IS 7781 edition 5 version 1
ICS:: 83.040.10

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Описание (английский):

ISO 7781:2017 specifies three methods for the determination of the soap and organic-acid content of raw styrene-butadiene rubber (SBR). - Method A is the titration method using indicator reagent. - Method B is the titration method using an automatic potentiometric titrator. - Method C is the back titration method using an automatic potentiometric titrator. Since the soaps and organic acids present in the rubber are not single chemical compounds, the method gives only an approximate value for the soap and organic-acid content.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 7781:2017 specifies standardized analytical methods for determining soap and organic‑acid content in raw styrene‑butadiene rubber (SBR). The document defines three extraction/titration procedures - two direct titration methods and one back‑titration - together with sampling, reagents and apparatus. It is intended for quality control and material characterization where the presence of residual soaps or organic acids affects rubber processing and product performance. Note: because soaps and organic acids in SBR are mixtures rather than single compounds, results are approximate.

Key Topics

Scope and principle

Measurement of soap and organic‑acid content after solvent extraction and acid–base titration.
Approximate quantitation only, due to mixed chemical nature of analytes.

Three methods

Method A: Manual titration using an indicator (thymol blue) - titrate aliquot with standardized HCl for soap and with standardized NaOH for organic acids.
Method B: Direct titration using an automatic potentiometric titrator - equivalence points determined by inflection of the titration curve.
Method C: Back titration with potentiometric end‑point detection (added acid, then back‑titrate with alkali). Annex B provides precision data for Method C.

Sample preparation

Test portion typically ~2 g (sheeted, cut to small strips); extracted with ethanol‑toluene azeotrope (ETA) or ethanol‑toluene‑water for alum‑coagulated SBR. Typical extraction volumes and aliquots are specified (e.g., two 100 cm3 reflux extractions combined to 250 cm3 final volume; 100 cm3 aliquots used for titration).

Reagents & apparatus

ETA (ethanol‑toluene azeotrope), NaOH (0.1 mol·dm−3), HCl (0.05 mol·dm−3), thymol blue, balance, reflux/Soxhlet, burette/pipettes, and a potentiometric titrator with suitable electrode.

Precision and reporting

Precision data are available only for Method C; Methods A and B have no precision data in the standard.
Clause 9 and Clause 11 outline expression of results and required test report content.

Applications

Quality control in SBR production to monitor residual soaps and organic acids that can affect vulcanization, compounding, and product stability.

Incoming raw‑material inspection for rubber processors and tyre, conveyor belt, hose and sealing‑product manufacturers.

Material testing laboratories and R&D groups validating compounding performance or investigating processing defects.

Useful when troubleshooting processing issues linked to surface active contaminants or acidity.

Related standards

ISO 1795 - Sampling and preparative procedures for raw rubber

ISO 385, ISO 648, ISO 1042, ISO 4799 - Laboratory glassware specifications referenced by ISO 7781:2017

Keywords: ISO 7781:2017, styrene‑butadiene rubber, SBR, soap content, organic‑acid content, titration, potentiometric titrator, back titration, ethanol‑toluene azeotrope, SBR testing.

ISO 7781:2017 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related standards

Технические детали

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