International standard test method for determination of alkalinity content in natural rubber latex concentrate
2021
Mohd Afieq Mohd Tajudin
This paper discussed the work done by the Malaysian Rubber Board (MRB) in revising the standard test method applicable to rubber and rubber products internationally. In 2016, the ISO technical committee elected Malaysia, represented by the MRB as the project leader for revision work of ISO 125:2011 - Determination of alkalinity content in natural rubber latex concentrate. The main goal of this project is to revise ISO standard test method (ISO 125:2011) by establishment of proper procedures for standardisation of sulfuric and hydrochloric acid in titration process. This paper also specifically discussed the comparison study between sulfuric acid and hydrochloric acid using two titration techniques, namely potentiometric and visual indicator. The results obtained were evaluated using statistical analysis which demonstrated comparable results between both acids and titration methods. Reliable precision statement in terms of repeatability (r) and reproducibility (R) was generated through the Interlaboratory Testing Programme (ITP). Hence, a new comprehensive precision statement for the test method was successfully established. The new edition of ISO 125:2020 was successfully published in February 2020. This project enhances the image and credibility of the MRB, especially at the national and international levels as an expert body in the development of standard test methods for natural rubber (NR) latex concentrate.
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