... and maintain 3.Lighter weight and higher strength Specification of rock wool sandwich panel Width: 950/960mm Length: Upon the ... : 50/75/100/120/150/170/200 mmCore Material: Rock wool External: Hot dig galvanized currugated color steel sheet Internal: ... wall sandwich panel referring to the plant, workshop,warehouse, office block, exhibition halls, gymnasiums, store, canopy, light steel villa, ...