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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Solutions to Produce Porosity-Free Extruded Dense Profiles with NORDEL EPDM

B01 li paper

Event: 198th Technical Meeting - Fall 2020
Location: Virtual
Date: October 19, 2020
Author: Greg (Guangming) Li
Paper Number: B01

Price: $20.00

  • The fully saturated hydrocarbon backbone of EPDM rubber results in outstanding weatherability, UV stability, and low/high temperature resistance. Therefore EPDM rubber has been established as the primary polymer choice for automotive sealing applications (both dense and sponge weather strip). A typical manufacturing process of automotive dense weatherstrip involves profile extrusion followed by continuous vulcanization. Excessive porosity in extruded and fully cured dense profiles remains a big challenge to many automotive weatherstrip Tier suppliers. Dow’s new Advanced Molecular Catalyst (AMC) and polymerization process technology advancements enable enhanced molecular structure design of EPDM. Furthermore, significant research efforts were directed to understand how the rubber formulation and processing parameters affect the final EPDM rubber products. A factory mixing and extrusion trial was conducted to develop a technical package for dense profile based on NORDEL™ EPDM that is free of porosity. This report summarizes the effects of a) Compound Formulation; b) Extrusion Conditions; and c) Vulcanization Conditions, on the porosity of the final extruded dense profile and present a porosity free solution for EPDM dense profile.

    Papers from 198th Technical Meeting - Fall 2020

    Items from 198th Technical Meeting - Fall 2020