Carbon felt is used to produce graphite felt The carbon felt made by carbonizing the raw material viscose fiber felt (PAN-based pre-oxygen felt) is treated at a temperature of 2200°C to remove impurities and increase the carbon content. It is used in the photovoltaic field. These synthetic felts then undergo a multi-step heat treatment. Felt made of carbon fiber is referred to as carbon felt. According to the different fiber raw materials, it can be divided into three types: polyacrylonitrile (PAN) based, asphalt based and viscose based. Carbon felt for thermal insulation Carbon. By 2026, CARBON will be manufacturing and marketing competitive, reliable, durable, high-efficiency and very low-carbon photovoltaic products.