ISO 248-2-2019 PDF

Full title and description

ISO 248-2:2019 — Rubber, raw — Determination of volatile‑matter content — Part 2: Thermogravimetric methods using an automatic analyser with an infrared drying unit. This second edition updates and replaces the 2012 edition and defines thermogravimetric procedures for routine determination of moisture and other volatile matter in various forms of raw and synthetic rubbers.

Abstract

This document specifies two thermogravimetric methods using an automatic analyser fitted with an infrared drying unit for determination of moisture and other volatile‑matter content in raw rubbers. It is applicable to many synthetic rubbers listed in ISO 1629 and to sample forms such as bale, block, chip, pellet, crumb, powder and sheet. The methods are intended primarily for routine determinations (for example quality control) when analyser conditions are fixed; they are not applicable where homogenizing is required as specified in ISO 1795. In cases of dispute the oven method, procedure A, of ISO 248‑1:2011 is the referee method.

General information

• Status: Published (International Standard; confirmed in systematic review).
• Publication date: 26 March 2019 (Edition 2 published).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 83.040.10 (Latex and raw rubber).
• Edition / version: Edition 2 (2019).
• Number of pages: 10.

Summary details above are taken from the ISO bibliographic record; the publication was systematically reviewed and confirmed in 2024.

Scope

Specifies two thermogravimetric procedures, using an automatic analyser with an infrared drying unit, for determining moisture and volatile‑matter content in raw rubber. Methods apply to a range of synthetic rubbers named in ISO 1629 and to common sample presentations (bale, block, chip, pellet, crumb, powder, sheet). Methods may be extended to other raw rubbers only when mass change can be shown to be loss of original volatile matter rather than rubber degradation. Methods are not applicable to raw rubbers that require homogenizing per ISO 1795. Where results from these methods and from the hot‑mill or oven methods in ISO 248‑1 differ, the oven method (procedure A) in ISO 248‑1:2011 serves as the referee method.

Key topics and requirements

• Thermogravimetric determination of volatile matter using an automatic analyser with an infrared drying unit.
• Two specified procedures intended for routine and quality‑control testing when analyser parameters are fixed.
• Applicability to a range of synthetic rubbers (SBR, NBR, BR, IR, CR, IIR, halogenated IIR, EPDM) and multiple sample forms.
• Restriction: not for samples requiring homogenization (see ISO 1795).
• Dispute resolution: oven method (procedure A) of ISO 248‑1:2011 is the referee method when methods disagree.
• Emphasis on demonstrating that mass loss is due to volatile matter and not to polymer degradation before applying the methods to other rubbers.

Typical use and users

Used by raw rubber producers, quality‑control and testing laboratories, compounders, material procurement teams, and R&D groups in the rubber and polymer industries. Typical applications include routine moisture and volatile‑matter checks on incoming or in‑process raw rubber, specification verification, and production quality monitoring.

Related standards

Closely related to ISO 248‑1 (hot‑mill and oven methods; oven method procedure A is the referee), ISO 1629 (nomenclature/classification of rubbers), and ISO 1795 (sampling and preparative procedures/homogenizing). ISO 248‑2:2019 forms part of the ISO 248 series on determination of volatile‑matter content in raw rubber.

Keywords

rubber, raw rubber, volatile matter, moisture content, thermogravimetric, infrared drying, automatic analyser, SBR, NBR, BR, IR, CR, IIR, EPDM, quality control.

FAQ

Q: What is this standard?

A: ISO 248‑2:2019 is an International Standard that specifies thermogravimetric methods using an automatic analyser with an infrared drying unit to determine moisture and other volatile matter in raw rubbers.

Q: What does it cover?

A: It covers two thermogravimetric procedures for routine determination of volatile‑matter content in various synthetic and raw rubber forms, including guidance on applicability limits and the requirement to rule out polymer degradation as the cause of mass loss. It excludes samples that require homogenizing per ISO 1795.

Q: Who typically uses it?

A: Quality control and testing laboratories in rubber manufacturing and supply chains, material scientists in R&D, compounders, and procurement or specification engineers who need consistent, routine measurement of volatile and moisture content.

Q: Is it current or superseded?

A: Current. ISO 248‑2:2019 (Edition 2) was published on 26 March 2019 and the publication record shows it was systematically reviewed and confirmed in 2024 (confirmation completed 14 June 2024), so this edition remains the active version.

Q: Is it part of a series?

A: Yes. It is Part 2 of the ISO 248 series on determination of volatile‑matter content in raw rubber; Part 1 (ISO 248‑1) specifies hot‑mill and oven methods and is referenced as the referee method when results differ.

Q: What are the key keywords?

A: Rubber, raw rubber, volatile matter, moisture, thermogravimetric method, infrared drying, automatic analyser, quality control, ISO 248.