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Standards Development
This document specifies two methods for the determination of cold flow characteristics of raw polybutadiene rubber (BR):
— Method A is a stress relaxation method using the rotorless rheometer;
— Method B is a creep testing method using compression assembly.
Polybutadiene rubber (BR) has been widely used for rubber products from tyres to shoe soles because BR shows excellent performance when applied to them. However it is well known that raw BR tends to be deformed called “cold flow” during storage and transportation comparing to other synthetic raw rubbers. The cold flow is slow deformation phenomenon under gravity or load. Once the cold flow occurs, it causes waste and loss leading to deterioration of productivity for both raw rubber manufacturers and their customers, therefore it is meaningful and helpful in the rubber industry to have standardized test methods to evaluate the cold flow as there is no unified test method for the evaluation of cold flow in raw BR.
According to resolution N 21/2023 at the meeting held on 2023-11-03 in Bangkok (Thailand), ISO/TC 45/SC 3 approved the proposal to develop a quantitative measurement method for cold flow of polybutadiene rubber.
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