ISO 7681:2024 PDF

Natural rubber field latex — Determination of dry rubber content

Название (английский):

ISO 7681:2024

Natural rubber field latex — Determination of dry rubber content

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 22 марта 2024 г.
Издание:: ISO IS 7681 edition 1 version 1
ICS:: 83.040.10

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Описание (английский):

This document specifies a method for the determination of the dry rubber content of natural rubber field latex. The method is not suitable for latices from natural sources other than Hevea brasiliensis, or for compounded latex, vulcanized latex or artificial dispersions of rubber.

Технические детали

Технический комитет: ISO/TC 45/SC 3 - Raw materials (including latex) for use in the rubber industry
SKU: ISO 7681:2024

Abstract

Overview

ISO 7681:2024 specifies a laboratory method for determining the dry rubber content (DRC) of natural rubber field latex from Hevea brasiliensis. The standard defines the principle, apparatus, reagents, two sheeting methods (hand and mechanical), calculation and reporting requirements. It is not applicable to latices from other natural sources, compounded or vulcanized latex, or artificial rubber dispersions.

Key topics and technical requirements

Scope and limitation: Applies only to field latex (raw latex with or without preservative) from Hevea brasiliensis.
Principle: Coagulate a weighed portion of latex, remove non‑rubber components, dry the coagulum and express DRC as a percentage by mass:
- DRC (%) = (mass of dry rubber / mass of latex test portion) × 100
Apparatus: ordinary lab equipment plus dish (glass/porcelain/aluminium), oven (70 °C ± 5 °C), desiccator, steam/water bath, analytical balance (1 mg readability), roller or laboratory mill, thickness gauge.
Reagents: 2.0% acetic acid (for coagulation) and 95% ethanol (to clear serum when required); use analytical grade reagents and distilled water.
Procedure options:
- Method A (hand sheeting): press coagulum into ~2 mm sheet, wash thoroughly, drain, oven‑dry to translucence, cool and weigh; repeat drying until mass loss

Overview

Key topics and technical requirements

Scope and limitation: Applies only to field latex (raw latex with or without preservative) from Hevea brasiliensis.
Principle: Coagulate a weighed portion of latex, remove non‑rubber components, dry the coagulum and express DRC as a percentage by mass:
- DRC (%) = (mass of dry rubber / mass of latex test portion) × 100
Apparatus: ordinary lab equipment plus dish (glass/porcelain/aluminium), oven (70 °C ± 5 °C), desiccator, steam/water bath, analytical balance (1 mg readability), roller or laboratory mill, thickness gauge.
Reagents: 2.0% acetic acid (for coagulation) and 95% ethanol (to clear serum when required); use analytical grade reagents and distilled water.
Procedure options:
- Method A (hand sheeting): press coagulum into ~2 mm sheet, wash thoroughly, drain, oven‑dry to translucence, cool and weigh; repeat drying until mass loss

ISO 7681:2024 PDF

Технические детали

Abstract

Overview

Key topics and technical requirements

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Abstract

Overview

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