1. Standard:ISO2531:2009/EN545:2010
2. Coating and lining:
External coating: Metallic Zinc spray coated
min. 130 gram/m2,200gram/m2 or 400 gram/m2 Zice-Alu with Bitumen
coated min. 70 uM thick according to ISO 8179-1
Internal lining: Cement mortar, SR
cement lining acc. to ISO 4179