ISO 24698-1:2018 PDF

Name: ISO 24698-1:2018 — Rubber, raw — Determination of bound acrylonitrile content in acrylonitrile-butadiene rubber (NBR) — Part 1: Combustion (Dumas) method
SKU: ISO 24698-1:2018
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Rubber, raw — Determination of bound acrylonitrile content in acrylonitrile-butadiene rubber (NBR) — Part 1: Combustion (Dumas) method

Название (английский):

ISO 24698-1:2018

Rubber, raw — Determination of bound acrylonitrile content in acrylonitrile-butadiene rubber (NBR) — Part 1: Combustion (Dumas) method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 28 сентября 2018 г.
Издание:: ISO IS 24698 edition 2 version 1
ICS:: 83.040.10

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Описание (английский):

This document specifies a method for the determination of the bound acrylonitrile content in NBR by an automatic analyser which uses a combustion process. The method is also applicable to XNBR (carboxylic acrylonitrile-butadiene rubber) and NBIR (acrylonitrile- butadiene-isoprene rubber) as well as NBR latex. NOTE This document and ISO 24698‑2 can give different results on the same rubber sample.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 24698-1:2018 specifies a standardized laboratory method for determining the bound acrylonitrile content in acrylonitrile‑butadiene rubber (NBR) using an automatic analyser based on the Dumas combustion (combustion) method. The method is also applicable to XNBR (carboxylic NBR), NBIR (acrylonitrile‑butadiene‑isoprene rubber) and NBR latex. Note: ISO 24698‑1 and ISO 24698‑2 can produce different results on the same sample because they use different analytical principles.

Key topics and technical requirements

Principle: Sample nitrogen is converted to oxides of nitrogen during high‑purity oxygen combustion, reduced to elemental nitrogen, separated from CO2 and H2O, then measured by a thermal conductivity detector (TCD). The measured nitrogen content is converted to bound acrylonitrile content by a factor (ISO provides the conversion formula: bound acrylonitrile = 37.9 × nitrogen mass %).

Apparatus components:

Combustion unit and high‑purity oxygen feeder
Reduction unit and absorber/separator for CO2/H2O
Carrier gas feed and TCD
Microprocessor for calibration and result calculation

Performance checks: Calibration and accuracy demonstrated using reference materials (e.g., L‑aspartic acid, L‑glutamic acid, EDTA). Ten successive determinations should have a mean within ±0.2 percentage points of the theoretical value and a relative standard deviation ≤ 0.5 % (by mass % nitrogen).

Reagents & gases: Oxygen (≥99.99 %), carrier gases such as helium, carbon dioxide or argon (≥99.995 %), ethanol, methanol.

Sampling & preparation:

Raw rubber: milling (nip ~0.2 mm, roll surface ~100 °C), solvent extraction with ethanol per ISO 1407 (method C), drying until mass change ≤ 2.0 mg over 10 min.
Latex: coagulation in ethanol/methanol, washing, milling and drying as above.

Procedure: Weigh test portion (50–500 mg) targeting 5–15 mg total nitrogen per test, combust, reduce and detect nitrogen, then calculate bound acrylonitrile.

Precision: Interlaboratory test programme (2006) assessed method precision (see Annex B).

Applications and who uses it

Quality control labs in rubber manufacturing to verify monomer incorporation in NBR grades.

Raw material suppliers and incoming‑goods inspection to confirm acrylonitrile content.

R&D and formulation teams assessing batch‑to‑batch consistency or new polymer grades (NBR, XNBR, NBIR, NBR latex).

Independent testing laboratories and certification bodies performing standardized compositional analysis.

Useful for product specifications, supplier audits and material traceability.

Related standards

ISO 24698‑2 (alternative method - may yield different results)

ISO 1795 (sampling and preparative procedures for raw rubber)

ISO 1407 (solvent extract determination; Method C referenced for extraction)

ISO 123 (rubber latex sampling)

This ISO 24698‑1:2018 guidance ensures reproducible determination of bound acrylonitrile content using the Dumas combustion technique and supports consistent quality control and material specification across the rubber industry.

ISO 24698-1:2018 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

ISO 24698-2:2018

Rubber, raw — Determination of bound acrylonitrile content in acrylonitrile-butadiene rubber (NBR) — Part 2:…

BS ISO 1407:2023

Rubber. Determination of solvent extract.

ISO 1795:2007

Rubber, raw natural and raw synthetic — Sampling and further preparative procedures

BS ISO 12312-3:2022

Eye and face protection. Sunglasses and related eyewear. Sunglasses for running, cycling and similar active l…