PTFE lined EPDM rubber expansion joints have advantages of PTFE and Rubber, PTFE can work in strong acid or strong alkali conditions, and rubber (EPDM) has very good flexible performance. Flanges standard: AISI, DIN, JIS, BS etc, or customs design Flanges material: Carbon steel, SS304, SS316, or other material. Body: EPDM, or Neoprene, Nature rubber, etc Lining: PTFE (Teflon) Size: DN50 (2\") TO DN1000 (40\")