The agency replaces MHP Communications following a competitive pitch process. The account was previously held by Hogarth, before its merger with Mandate and Penrose Financial.
Over the past few years, Low & Bonar, has reshaped its business, supplying yarns, fabrics and fibres to a broad range of end markets including civil engineering, building products, transport, sports & leisure and agriculture, among other industrial applications.
The company is currently restructuring its loss-making technical yarns business, which is now on track to be profitable this year.
Low & Bonar's shares have gained 40 per cent in the last six months thanks to increased exposure to emerging markets and new products.
College Hill's focus will be to communicate the firm's repositioning to the investment community.
The College Hill team will be led by partners Matthew Smallwood and Mike Davies.
Smallwood commented: 'Low and Bonar has a great new story to communicate. Its products are really exciting, high end technology that bring extraordinary benefits to many industrial processes.'