This paper aims to demonstrate how museum collection sustainability is grounded in a range of concrete care practices that are social and material. It explores the unstable nature of heritage materials, drawing on the ecological approach of infrastructure and maintenance studies in the field of art and museums. To do this, I analyse the role of mundane operations in the daily functioning of an exhibition area, presenting data from fieldwork I conducted from 2015–2016 at the Musée du quai Branly in (...) Paris, which preserves collections of art and ethnology from outside Europe. I observed the museum's preventive conservation practices, which work to minimise the risks of material deterioration of heritage objects, focusing attention on stabilising the relationship between objects and their environments. These practices contribute to the construction of the temporalities of museum objects. In exploring the means and devices of preserving these heritage objects, the very assumption of perpetuation is destabilised. Environments continually unfold with the silent material metamorphosis of objects. The exhibition becomes a place of flows, where a multitude of entities circulate and cohabit at different scales, such as insects, dust, and powdery fragments. The daily human work of vacuuming, cleaning, trapping, and measuring provide a set of actions united with other entities engaged in the material life of the exhibited object. As we zoom in on the exhibition space, different timelines emerge that are inextricably linked to the different lives of the museum. (shrink)