Technical Paper Archive


This site contains all papers presented at Rubber Division, ACS Technical Meetings from 2000-2018. Meetings prior to 2000 are incomplete and papers are added as they are digitized.


For older papers not listed here, please send your request, including Meeting Year, Title, Author, and Paper # to: cbrady@rubber.org


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EVOLUTION OF RPA TEST METHODOLOGIES FOR THE RUBBER INDUSTRY

2014fall 91

Event: 186th Technical Meeting
Location: Nashville, TN
Date: October 14, 2014
Author: By: John S. Dick*
Paper Number: 91

Price: $20.00

  • Since its introduction to the rubber industry in 1992, the RPA has transitioned from mostly R&D Applications, to factory problem solving, and ultimately into nine standard ASTM and ISO methods for day to day routine quality assurance applications.
    This paper discusses the development of RPA methodologies and procedures to more effectively characterize raw elastomers, measure and predict processability of mixed stocks, analyze scorch and cure profiles, and predict the performance of rubber products from measuring after-cure dynamic properties. New techniques with the RPA have also been developed for special testing of thermoplastic elastomers, natural rubber, and cellular rubber. Also new procedures were developed to enable the RPA to be an effective cure simulator, a stress relaxation tester, and an apparatus to record uncured viscous heating and cured heat buildup differences among rubber compounds. With recent improvements in the range and precision of strain and frequency sweeps, better predictions of high shear rate viscosities can be made through the Cox-Merz rule, better prediction of state-of-mix is achieved through ASTM D6204 Part B (high strain), better predictions of the degree of silanization can be made through improved, wider-range strain sweeps for the Payne effect, and better classifications of incoming natural rubber shipments with the RPA through ASTM D7050. Not only can the RPA be used to
    test anaerobic aging effects for rubber compounds, but new techniques have also been developed for measuring aerobic aging effects as well.

    Papers from 186th Technical Meeting

    Items from 186th Technical Meeting