The Hidden Cause of Yellowing in White / Natural Rotomolded Parts – and How to Prevent It

Dave Sullivan and Kyla Egerdeen

Borouge International (Nova Chemicals)

Gas fading has emerged as a more widespread and costly issue in rotational molding than previously recognized. In particular, it presents a significant production limitation, leading to visual defects, increased scrap rates, and lost sales. For example, manufacturers of white molded products such as coolers and chairs can experience yellowing defects that render parts unsellable, often requiring regrind and reprocessing.

This workshop will review the underlying mechanisms that contribute to gas fading in rotational molding, along with practical mitigation strategies that can be implemented at the production level. Key topics will include processing conditions, environmental contributors, and color formulation considerations that influence susceptibility to gas fading.

In addition, the role of material selection will be discussed, including how Borouge International (legacy NOVA Chemicals) TRx product line and close collaboration with resin suppliers can help reduce the risk of gas fading. The objective is to demonstrate that gas fading is not an unavoidable outcome, but a controllable issue that can be addressed through informed material and process decisions.

The session will conclude with an interactive discussion, where participants will be invited to share their experiences with gas fading. This open forum is intended to assess how widely the issue is impacting molders and to facilitate the exchange of practical insights across the group. Will gain a clearer understanding of the causes of gas fading and practical strategies to reduce defects, scrap, and lost product value.