Candle type filter cartridges are mainly used for filtering high temperature, high pressure, and high viscosity polymer and polyester melts. The upper and lower covers are made of stainless steel material (316L) to ensure its corrosion resistance, while the filtering medium is made of stainless steel fiber sintered felt and stainless steel wire woven mesh folded and corrugated, with a small external size and a large filtering area, which can be repeatedly cleaned and used.