HJ/T 253-2006 Specifications for environmental protection product Microporous filter

GB/T 1220-1992 Stainless steel bars GB/T 1220-2007 Stainless steel bars GB/T 11901-1989 Water quality—Determination of suspended substance—Gravimetric method GB/T 13306-1991 Plates GB/T 13306-2011 Plates GB/T 13922.1-1992 Performance test for water treatment equipment General rules GB/T 191-2000 Packaging—Pictorial marking for handling of goods GB/T 191-2008 Packaging—Pictorial marking for handling of goods GB/T 1966-1996 Test method for apparent porosity and bulk density of porous ceramic GB/T 1966-2024 Porous ceramics—Determination of apparent porosity and bulk density GB/T 1967-1996 Test method for pore diameter of porous ceramic GB/T 4237-1992 Hot rolled stainless steel sheets and plates GB/T 4237-2007 Hot rolled stainless steel plate, sheet and strip GB/T 4237-2015 Hot rolled stainless steel plate,sheet and strip GB/T 6388-1986 Transport package shipping mark GB/T 699-1999 Quality carbon structural steels GB/T 699-2015 Quality carbon structure steels GB/T 709-1988 Dimensions, shape, weight and tolerances for hot-rolled plates and sheets GB/T 709-2006 Dimension,shape,weight and tolerances for hot-rolled steel plates and sheets GB/T 709-2019 Dimension,shape,weight and tolerance for hot-rolled steel strip,plate and sheet JB/T 2932-1999 Water treatment equipment technical specifications GB/T 191-2025 Graphical symbols marking for handling and storage of packages