ISO 125:2020 PDF

Name: ISO 125:2020 — Natural rubber latex concentrate — Determination of alkalinity
SKU: ISO 125:2020
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Natural rubber latex concentrate — Determination of alkalinity

Название (английский):

ISO 125:2020

Natural rubber latex concentrate — Determination of alkalinity

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 19 февраля 2020 г.
Издание:: ISO IS 125 edition 7 version 1
ICS:: 83.040.10

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Описание (английский):

This document specifies a method for the determination of the alkalinity of natural rubber latex concentrate. The method is not necessarily suitable for latices from natural sources other than Hevea brasiliensis or for synthetic rubber latices, compounded latex, vulcanized latex or artificial dispersions of rubber. NOTE A method for the determination of the alkalinity of polychloroprene latex is specified in ISO 13773.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 125:2020 specifies a standardized laboratory method for the determination of alkalinity in natural rubber latex concentrate (Hevea brasiliensis). The method measures the acid volume required to reach pH 6 in a stabilized test portion and expresses alkalinity as either ammonia (NH3) or potassium hydroxide (KOH) depending on the preservative used. The standard is aimed at quality control and laboratory testing within the rubber industry and includes procedural, reagent and reporting requirements.

Key topics and technical requirements

Scope & limitations: Applies to natural rubber latex concentrate from Hevea brasiliensis; not necessarily suitable for synthetic latices, compounded or vulcanized latex, or artificial dispersions.

Principle: Titrate a stabilized latex sample to pH 6.0 ± 0.05 and calculate alkalinity from the acid consumed.

Reagents:

5% (w/w) non‑ionic stabilizer (alkyl phenol polyethylene oxide condensate), pH adjusted to 6.0 ± 0.05
Standard volumetric acid solutions: H2SO4 c = 0.05 mol·dm‑3 or HCl c = 0.10 mol·dm‑3
Methyl red and methyl orange indicators; Na2CO3 standard for acid standardization

Methods: Two acceptable titration techniques:

Potentiometric titration using a pH‑meter (combined electrode, readable to 0.02 pH units)
Visual indicator titration using methyl red (colour change yellow → pink)

Calculations: Alkalinity expressed as % NH3 or % KOH using prescribed factors (e.g., F = 1.7 or 3.4 for NH3 with HCl/H2SO4; F = 5.61 or 11.22 for KOH).

Apparatus & sampling: Requires standard lab equipment, stirrer, balance (0.01 g readability), and sampling per ISO 123.

Quality metrics: Precision data (repeatability and reproducibility) are provided in Annex A; typical repeatability r ≈ 0.01–0.02 and reproducibility R ≈ 0.03–0.06 (values depend on method/acid).

Applications and who uses it

Latex producers: Routine quality control of concentrate alkalinity to ensure preservative effectiveness and product consistency.

Testing laboratories: Accredited labs performing contract testing or compliance verification.

Rubber product manufacturers: Incoming raw-material evaluation and supplier qualification.

Regulatory and standards bodies: Method reference for specifications, conformity assessment and inter‑laboratory studies.

Related standards

ISO 123 - Rubber latex - Sampling (referenced for sampling procedure)

ISO 976 - pH measurement for polymer dispersions and rubber latices

ISO 13773 - Alkalinity determination for polychloroprene latex (separate method)

ISO 125:2020 is a practical, reproducible test method for laboratories requiring reliable alkalinity determination in natural rubber latex concentrate, supporting quality control, supplier assessment and regulatory compliance.

ISO 125:2020 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

BS ISO 12312-3:2022

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

ISO 976:1996/Amd 1:2006

Rubber and plastics — Polymer dispersions and rubber latices — Determination of pH — Amendment 1: Precision d…

ISO 13773:1997

Rubber — Polychloroprene latex — Determination of alkalinity