As part of on going product development non-fragility testing has been completed at the Building Research Establishment on both flat and curved versions of Rockwell's System 655/16 multiwall polycabonate glazing system.

Class B results for the two versions of the system were obtained for spans of 3m and 2.68m respectively, enabling both versions to comply with HSE guidlines concerning non-fragile rooflights [ACR(M)001:2005].