The general design description lists characteristics of the Roto NT, A hinge, tilt & turn window hardware.
RotoSil surface protection procedure has been developed by Roto for the hardware product range, based upon galvanising, chromating and an additional sealing. RotoSil enables the hardware components to appear in a smooth silver tone. The quality requirements of RAL-RG 607/3 are exceeded, also the protection effect against acids has been decisevly improved. The surface protection regulations of the RAL quality assurance association in Velbert, Germany are more than fulfilled. Surface protection with RotoSil exceeds the requirements of the following standards:
- RAL 607/3 (72 hours protection from white rust and 240 hours protection against red rust. Inclusive of cycle testing to 60,000 cycles).
- BS 6375 pt. 2 “Performance of Windows.”
- BS EN 1670:2007 part 5.6, grade 5 (480 hours building hardware corrosion resistance).