# Aging Behavior of EPDM Compounds with Ground Tire Rubber (GTR) as a Functional Substitute for Calcium Carbonate

## TL;DR

This study explores using ground tire rubber as a sustainable substitute for calcium carbonate in EPDM compounds, finding a balance between performance and environmental benefits.

## Contribution

The paper introduces ground tire rubber as a direct filler replacement in EPDM compounds, offering a sustainable alternative to calcium carbonate.

## Key findings

- GTR reduces crosslink density and initial mechanical performance due to structural defects.
- Recycled GTR accelerators promote faster curing and thermo-oxidative stress increases crosslink density.
- Partial GTR replacement is feasible, but high contents impair mechanical properties.

## Abstract

This study investigates the substitution of calcium carbonate (CaCO3) with ground tire rubber (GTR) in EPDM-based elastomer formulations as a strategy for sustainable material development. Unlike conventional approaches, this work employs GTR as a direct filler replacement. Temperature scanning stress relaxation (TSSR) analyses confirm that GTR participates in vulcanization. Initial incorporation of GTR reduces crosslink density (CLD) and mechanical performance due to structural defects, while accelerators present in the recycled phase promote faster curing. This study focuses on the aging behavior of the compounds to evaluate possible long-term effects on the material. The thermo-oxidative stress leads to further crosslinking, resulting in higher CLD, increased stiffness and reduced elongation at break. Overall, partial replacement of CaCO3 by GTR proves feasible, offering a balanced compromise between sustainability and performance, whereas high GTR contents significantly impair mechanical properties.