"...Rowan designed the first Canadian all-plastic vacuum Thermos flask for Canadian Thermos Products in 1962. American Thermos had launched an all-plastic model six moths earlier, but it employed a less sophisticated mould and could only be produced in a single colour. Rowan used polypropylene, a new plastic material, which was more heat resistant and permitted brighter colours. The design featured two symmetrical half moulds in two colours, set the standard for industry and remained in production for over thirty years." (Gottlieb and Golden, 2004, p. 19)
Design in Canada (2004), p. 19