ISO 24376:2022 PDF

Name: ISO 24376:2022 — Rubber, raw natural — Guidelines and requirements for technically specified low-protein natural rubber
SKU: ISO 24376:2022
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Rubber, raw natural — Guidelines and requirements for technically specified low-protein natural rubber

Название (английский):

ISO 24376:2022

Rubber, raw natural — Guidelines and requirements for technically specified low-protein natural rubber

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 25 марта 2022 г.
Издание:: ISO IS 24376 edition 1 version 1
ICS:: 83.040.10

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Описание (английский):

This document provides guidelines and gives requirements on the specification of low protein natural rubber (LPNR). A grading system is proposed, based on the origin of the natural rubber content and differentiated by the two processes, enzymatic and non-enzymatic, applied for removal of the proteins.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview - ISO 24376:2022 and low protein natural rubber (LPNR)

ISO 24376:2022 defines guidelines and requirements for technically specified low-protein natural rubber (LPNR) produced from Hevea brasiliensis latex. The standard establishes a grading system that distinguishes LPNR by the source material and by the protein-removal process - enzymatic (E) or non‑enzymatic (NE) - and by whether viscosity is controlled (constant viscosity, CV). It covers material composition, grade structure, specification limits, sampling and packaging for deproteinised natural rubber (DPNR/LPNR).

Key topics and technical requirements

Grade structure: Grades combine raw material and process labels (examples: E-WFS, E‑CV55, E‑CV65, NE‑WFS, NE‑CV55, NE‑CV65). CV indicates viscosity-stabilized rubber.

Chemical and physical limits (typical values specified):

Dirt retained on sieve: max 0.03%
Ash: max 0.25%
Nitrogen content: max 0.15%
Volatile matter: max 0.5%
Plasticity retention index (PRI): min 40
Mooney viscosity (ML(1+4) at 100 °C) for CV grades: 55 ± 5 or 65 ± 5
Extractable protein: max 100 µg/g (ASTM D5712)
Antigenic protein (for food/medical-suitable grades): max 10 µg/g (ASTM D6499)

Sampling and testing: Sampling per ISO 1795; normative test methods referenced include ISO 1656 (nitrogen), ISO 247-1 (ash), ISO 249 (dirt), ISO 289-1 (Mooney viscosity), ISO 248-1 (volatile matter), ISO 2930 (PRI).

Production processes: Describes enzymatic proteolysis and non‑enzymatic extraction methods (e.g., fumed silica, urea, aluminium hydroxide, surfactants) and their impacts on protein removal.

Packaging: Typical bale mass (33.30 kg ± 0.17 kg), crate packing (1.2 t), bale dimensions and recommended polyethylene wrapping characteristics.

Practical applications

Medical and food-contact rubber where low antigenic protein is critical.

Seals, joint rings, hydro-mounts and anti‑vibration mountings benefiting from lower creep, reduced stress relaxation and better dynamic properties.

Undersea and humidity-sensitive applications where low water absorption and consistent modulus are required.

Compounding and formulation where controlled viscosity (CV grades) aids processing and product consistency.

Who should use ISO 24376:2022

Natural rubber producers and processors implementing deproteinisation (DPNR/LPNR)

Rubber compounders and product manufacturers (automotive, medical, food-contact)

Quality, procurement, and regulatory teams specifying raw rubber grades

Test laboratories and standards bodies referencing consistent test methods

Related standards

ISO 1795 (sampling), ISO 1656 (nitrogen), ISO 247‑1 (ash), ISO 249 (dirt), ISO 289‑1 (Mooney), ISO 2930 (PRI), ISO 2000 (raw natural rubber guidance), plus ASTM D5712 and ASTM D6499 for protein assays.

Keywords: ISO 24376:2022, low protein natural rubber, LPNR, deproteinised natural rubber, DPNR, Hevea brasiliensis, enzymatic protein removal, Mooney viscosity, extractable protein.

ISO 24376:2022 PDF

Abstract

Похожие стандарты

Overview - ISO 24376:2022 and low protein natural rubber (LPNR)

Key topics and technical requirements

Practical applications

Who should use ISO 24376:2022

Related standards

Технические детали

ISO 1795:2007

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

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