Robin’s Polypropylene Chair family continued to expand during the 1970s. This kind of seating proved ideal for the educational market because of its low-cost and durability. Catering to this sector, Robin’s Series E School Chairs, launched in 1971, were designed to accommodate growing children from tots to teens.

His Polo chair, the last major addition to the Polypropylene range, was another perennially popular design. With its distinctive rows of drainage and ventilation holes and its fade-resistant colouring, it was suitable for both interior and exterior use. Beam-mounted variants of Robin’s Polo and Polypropylene Seating were widely adopted in the commercial arena, particularly in airports and football stadia.

Robin continued to experiment with other plastics during the 1970s. His pedestal-mounted 4-4000 Armchair, made from ABS, was one the largest injection-moulded plastic chairs ever produced. ABS was also used for his Tote Tables, while his Obo chairs were blow-moulded from propathene (ICI’s version of polypropylene) with a vacuum-formed polystyrene shell seat.