Robust One-Size liner with 5.0 mm layer thickness. Suitable for ambient and steam curing, max. 100°C / 212°F. 1D STEAMLINER 5 mm is approved as part of the Boldan In-House Lining System® Certificate. 1D STEAMLINER 4 mm is designed for the installation with the inversion process by air or water column and is suitable for ambient, steam, or hot water curing.