Multilayer packaging (MLP) is made from Polyethylene terephthalate (PET), Polyethylene (PE), Polypropylene (PP), Ethylene vinyl alcohol (EVOH), Polyvinyl chloride (PVC), and tie layer materials. MLPs are either burned or dumped in landfills after their use, which causes many hazards to humans and the environment. MLPs are recycled in recycling facilities and converted into pellets to reuse them. However, the MLPs are strongly contaminated by volatile organic compounds and odorous compounds, which prevents their use in high-end applications, i.e., cosmetics, packaging, etc. In the research work, a remediation strategy is proposed to reduce VOCs and odorous compounds from MLP recyclates using heated air oven treatments, which are also easily scalable to pilot and industrial scales. VOCs and odor are reduced significantly without compromising the product’s mechanical, thermal, and other properties.

Recycled polyethylene terephthalate (rPET) is widely considered a sustainable alternative to virgin polyethylene terephthalate (PET). Nevertheless, its application in value‐added processes is frequently restricted due to property degradation occurring during recycling. This study investigates the use of slate dust (SD) as a reinforcing filler and its effects on the structural, thermal, and thermomechanical properties of rPET. Twin‐screw extrusion and injection molding were used to prepare composites with up to 20 wt% of SD. Gel permeation chromatography, Fourier transform infrared spectroscopy, and x‐ray diffraction confirmed that SD maintains chemical inertness during processing, with no detectable molecular degradation due to the filler. With a 20 wt% SD content, the thermal conductivity of rPET increased by approximately 41%, from 0.267 to 0.377 W/mK. Additionally, the crystallization temperature increased by 5°C, indicating the filler's nucleating effect. Dynamic mechanical analysis (DMA) indicates a ~39% increase in storage modulus at room temperature. To further explore the filler‐matrix interaction, Cole‐Cole plots and C‐factor, reinforcement efficiency, degree of entanglement, and adhesion‐related factors (A and B factors) were calculated from the DMA results. This study promotes waste valorization strategies by using slate waste as a filler and enhancing rPET to develop recycled polymer composites aligned with circular economy principles.