ISO 2930:2024 PDF

Name: ISO 2930:2024 — Raw, natural rubber — Determination of the plasticity retention index (PRI)
SKU: ISO 2930:2024
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Raw, natural rubber — Determination of the plasticity retention index (PRI)

Название (английский):

ISO 2930:2024

Raw, natural rubber — Determination of the plasticity retention index (PRI)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 19 июля 2024 г.
Издание:: ISO IS 2930 edition 6 version 1
ICS:: 83.040.10

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Описание (английский):

This document specifies a method to determine the plasticity retention index (PRI) of raw natural rubber. The PRI is a measure of the resistance of raw natural rubber to thermal oxidation. A high resistance to thermal oxidation is shown as a high value of the index. PRI is not an absolute value and cannot give an absolute classification of plasticity number of different natural rubber after oxidation.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 2930:2024 specifies a laboratory method to determine the Plasticity Retention Index (PRI) of raw, natural rubber - a measure of the material’s resistance to thermal oxidation. The standard defines sample preparation, ageing (oven) conditions, rapid plasticity measurement and calculation of PRI as a percentage ratio of plasticity after and before oven ageing. It clarifies that PRI is a comparative indicator (not an absolute classifier) of the plasticity number after oxidation.

Key topics and technical requirements

Test principle: Rapid plasticity numbers are measured on unaged and oven-aged samples using a parallel-plate plastimeter (10 mm platen) following ISO 2007. PRI = (plasticity_after / plasticity_before) × 100.

Ageing conditions: Oven ageing at 140 °C for 30 min in an air environment; oven temperature control ±0.5 °C and recovery to within 1 °C within 5 min after insertion.

Air flow: Nominal requirement of 10 air changes per hour or alternatively a semi-open oven air flap (Annex A demonstrates equivalence for practical use).

Sample preparation: Homogenize per ISO 1795; prepare a doubled sheet (final thickness 3.4 ± 0.2 mm) from a (20 ± 2) g test portion using a laboratory mixing mill; cut six discs and split into triplicate sets for unaged and aged testing.

Measurement: Perform triplicate rapid-plastimeter determinations per ISO 2007, read to the nearest 0.5 unit; median values used to compute PRI; round to the nearest whole number.

Apparatus: Parallel-plate plastimeter (10 mm), punch, thickness gauge (0.01 mm scale), specified mixing-mill characteristics, lightweight aluminium dishes/tray, bleached acid-free tissue paper (≈27 g/m2).

Reporting: Test report must reference ISO 2930:2024 and include sample identification, median plasticity numbers (unaged and aged), PRI, date, and any non-standard operations.

Practical applications and users

ISO 2930:2024 is used for quality control, acceptance testing and comparative assessment in the rubber industry:

Rubber manufacturers and processors - monitor raw natural rubber stability against thermal oxidation during storage and processing.

Quality assurance & incoming inspection - evaluate batches of raw rubber for consistent oxidative resistance (PRI helps flag unstable lots).

R&D and formulation teams - compare stabilization treatments or provenance effects on oxidation resistance.

Independent testing laboratories and certification bodies - provide standardized PRI data for commercial and regulatory records.

Procurement/specification writers - incorporate PRI requirements into purchase specifications for raw natural rubber.

Related standards

ISO 2007 - Rapid-plastimeter method for plasticity

ISO 1795 - Sampling and preparative procedures for raw rubber

ISO 2393 - Rubber test mix preparation and mixing mill requirements

ISO 23529 - Conditioning test pieces for physical methods

ISO 1382 - Terminology (plasticity definitions)

Keywords: ISO 2930:2024, Plasticity Retention Index, PRI, raw natural rubber, thermal oxidation, rapid plasticity, plastimeter, oven ageing, rubber testing, quality control.

ISO 2930:2024 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Технические детали

BS ISO 20070:2025

Biotechnology. Biobanking. Requirements for primary containers for storing biological materials in biobanks

ISO 1795:2007

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

SIST EN ISO 23936-4:2024

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ISO 23529:2016

Rubber — General procedures for preparing and conditioning test pieces for physical test methods

SIST ISO 13829:2010

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