Our 137cm Wide, 220gsm, SB112 Sarille Inherent Flame Retardant, Synthetic Interlining. Conforms To BS 5867 – 2: 2008 Type C. It Is Ideal Where You Need To Exclude Draughts From Windows, It Also Helps To Improve The Drape And Hang Of Curtains And Provides Insulation. Interlining Is A Loosely Woven Fabric Which Is Brushed To Give A Lofty Feel.