ISO 2002-1975 rus PDF

Full title and description

ISO 2002:1975 — Raw styrene-butadiene rubber (SBR) — Determination of organic acid content. (This entry corresponds to the ISO 1975 edition; a Russian-language catalog entry exists for this standard.)

Abstract

Specifies a laboratory method for estimating the organic-acid content of raw styrene-butadiene rubber (SBR). The procedure is based on solvent extraction of organic acids from a measured sample of SBR followed by a titrimetric determination of the extracted acids. The method yields an approximate value for organic-acid content and may require minor adjustments for oil-extended rubbers.

General information

• Status: Withdrawn (replaced).
• Publication date: February 1975 (1975-02).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 83.040.10 (Latex and raw rubber).
• Edition / version: Edition 1 (1975).
• Number of pages: 2 (original ISO publication).

Scope

Applies to the determination of organic-acid content in raw styrene-butadiene rubber (SBR) intended for laboratory quality control and materials specification. The method covers extraction of acids from the polymer matrix using an appropriate solvent system and quantification by titration; it is intended for routine analysis and provides approximate rather than absolute values because the acids and soaps present are not single defined compounds.

Key topics and requirements

• Sampling and sample preparation for raw SBR (thin strips or representative portions).
• Solvent extraction of organic acids from rubber (practical use of an ethanol–toluene azeotrope or equivalent solvent system).
• Separation of extract and preparation of aliquots for titration.
• Titrimetric determination of organic acids using an appropriate standard titrant and indicator; results expressed as mass fraction or concentration.
• Considerations for oil-extended or modified SBR grades (method adjustments may be required).
• Statement that the method gives approximate results because soaps and organic acids in SBR are mixtures rather than single chemical entities.

Typical use and users

Used by rubber raw-material suppliers, rubber compounding and manufacturing quality-control laboratories, independent testing laboratories, and standardization bodies for batch acceptance, incoming inspection and basic formulation control of SBR. Also of interest to researchers assessing raw-material purity and contamination.

Related standards

ISO 7781:1986 (replacement — determination of soap and organic-acid content in raw SBR) and related ISO test methods for raw rubber (for example companion ISO procedures for soap determination and other SBR test methods originally in the ISO 2000–2010 series). National/adopted versions and technical committee publications from ISO/TC 45 may also be relevant.

Keywords

ISO 2002:1975; styrene-butadiene rubber; SBR; organic acid; titration; solvent extraction; ethanol–toluene; raw rubber testing; ISO/TC 45; withdrawn.

FAQ

Q: What is this standard?

A: ISO 2002:1975 is an ISO test method titled "Raw styrene-butadiene rubber (SBR) — Determination of organic acid content" that specifies a solvent-extraction and titrimetric procedure for estimating organic acids in raw SBR. The original publication date is February 1975.

Q: What does it cover?

A: It covers sampling, solvent extraction of organic acids from SBR and titrimetric determination of the extracted acids to provide an approximate measure of organic-acid content; it notes adjustments may be needed for oil-extended rubbers.

Q: Who typically uses it?

A: Rubber manufacturers, raw-material suppliers, QC/testing laboratories and standards bodies use this type of method for incoming material checks, formulation control and basic quality assurance.

Q: Is it current or superseded?

A: The standard has been withdrawn; it was superseded by ISO 7781:1986 (which covers soap and organic-acid content for raw SBR).

Q: Is it part of a series?

A: It is part of the set of ISO test methods addressing raw rubber and SBR (numbers in the ISO 2000–2010 range) developed by ISO/TC 45 (Rubber and rubber products). Companion standards include methods for soap content and other raw-rubber properties.

Q: What are the key keywords?

A: Styrene-butadiene rubber, SBR, organic acid, solvent extraction, titration, raw rubber, ISO 2002:1975, withdrawn, ISO 7781.