The REHAU plant in Amlwch was opened in 1974/1975 by REHAU Ltd, a German‑founded polymer and plastics manufacturing company. It formed part of the company’s expansion in the UK manufacturing network alongside another plant at Blaenau‑Ffestiniog in North Wales.
The factory specialised in plastic extrusion and moulded parts, particularly PVC products used in sectors like furniture edgebanding, automotive components, and domestic appliances. It became a significant local employer.
Over its operational life, REHAU invested in modern equipment and facilities. For example, a notable £3 million investment in the plant was announced around 2007–2008, aimed at upgrading PVC extrusion capabilities and supporting the workforce.
The company also implemented environmental and infrastructure improvements on the site, such as rainwater recovery and storm‑water management systems, reflecting investment in sustainability and operations
In 2015 the plant was celebrating its 40th Aniversary in Amlwch and was still employed 106 people.
In 2019, REHAU announced the closure of the Amlwch facility due to a significant decline in demand for its key PVC products. This resulted in the loss of around 100 jobs, which local leaders described as a “devastating blow” for the town and broader North Anglesey community.
The former REHAU site (part of Llwyn Onn Industrial Estate) was later included in the Anglesey Enterprise Zone, a Welsh Government initiative aimed at stimulating investment and job creation in key sites on the island.